/liquidfeedback/moonbridge/moonbridge.c
C | 2365 lines | 2053 code | 158 blank | 154 comment | 571 complexity | 4c4356d9b9c89ff80358e23f189c7b9f MD5 | raw file
Possible License(s): Apache-2.0
- /*** Version ***/
- #define MOONBR_VERSION_STRING "1.0.1"
- /*** Compile-time configuration ***/
- #define MOONBR_LUA_PANIC_BUG_WORKAROUND 1
- /*** C preprocessor macros for portability support ***/
- #ifndef __has_include
- #define __has_include(x) 0
- #endif
- /*** Include directives for used system libraries ***/
- #include <stdlib.h>
- #include <stdint.h>
- #include <string.h>
- #include <errno.h>
- #include <unistd.h>
- #include <signal.h>
- #include <sys/wait.h>
- #include <sys/resource.h>
- #include <poll.h>
- #include <time.h>
- #include <sys/time.h>
- #include <sys/socket.h>
- #include <sys/un.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #include <arpa/inet.h>
- #include <getopt.h>
- #include <sys/file.h>
- #include <syslog.h>
- #if defined(__FreeBSD__) || __has_include(<libutil.h>)
- #include <libutil.h>
- #endif
- #if defined(__linux__) || __has_include(<bsd/libutil.h>)
- #include <bsd/libutil.h>
- #endif
- #if defined(__linux__) || __has_include(<bsd/unistd.h>)
- #include <bsd/unistd.h>
- #endif
- /*** Fallback definitions for missing constants on some platforms ***/
- /* INFTIM is used as timeout parameter for poll() */
- #ifndef INFTIM
- #define INFTIM -1
- #endif
- /*** Include directives for Lua ***/
- #include <lua.h>
- #include <lauxlib.h>
- #include <lualib.h>
- /*** Include directive for moonbridge_io library ***/
- #include "moonbridge_io.h"
- /*** Constants ***/
- /* Backlog option for listen() call */
- #define MOONBR_LISTEN_BACKLOG 1024
- /* Maximum length of a timestamp used for strftime() */
- #define MOONBR_LOG_MAXTIMELEN 40
- /* Maximum length of a log message */
- #define MOONBR_LOG_MAXMSGLEN 4095
- /* Exitcodes passed to exit() call */
- #define MOONBR_EXITCODE_GRACEFUL 0
- #define MOONBR_EXITCODE_CMDLINEERROR 1
- #define MOONBR_EXITCODE_ALREADYRUNNING 2
- #define MOONBR_EXITCODE_STARTUPERROR 3
- #define MOONBR_EXITCODE_RUNTIMEERROR 4
- /* Maximum length of a line sent to stderr by child processes */
- #define MOONBR_MAXERRORLINELEN 1024
- /* Maximum length of an error string returned by strerror() */
- #define MOONBR_MAXSTRERRORLEN 80
- /* Error message for noncompliant strerror_r() implementation on GNU systems */
- #define MOONBR_STRERROR_R_MSG "Error detail unavailable due to noncompliant strerror_r() implementation"
- /* Status bytes exchanged between master and child processes */
- #define MOONBR_STATUS_IDLE 'I'
- #define MOONBR_COMMAND_CONNECT 'C'
- #define MOONBR_COMMAND_TERMINATE 'T'
- #define MOONBR_STATUS_GOODBYE 'B'
- /* Constant file descriptors */
- #define MOONBR_FD_STDERR 2
- #define MOONBR_FD_CONTROL 3
- #define MOONBR_FD_END 4
- /* Return values of moonbr_try_destroy_worker() */
- #define MOONBR_DESTROY_NONE 0
- #define MOONBR_DESTROY_PREPARE 1
- #define MOONBR_DESTROY_IDLE_OR_ASSIGNED 2
- /*** Types ***/
- /* Enum for 'moonbr_pstate' */
- #define MOONBR_PSTATE_STARTUP 0
- #define MOONBR_PSTATE_RUNNING 1
- #define MOONBR_PSTATE_FORKED 2
- /* Enum for 'proto' field of struct moonbr_listener */
- #define MOONBR_PROTO_MAIN 1
- #define MOONBR_PROTO_INTERVAL 2
- #define MOONBR_PROTO_LOCAL 3
- #define MOONBR_PROTO_TCP 4
- /* Data structure for a pool's listener that can accept incoming connections */
- struct moonbr_listener {
- struct moonbr_pool *pool;
- struct moonbr_listener *prev_listener; /* previous idle or(!) connected listener */
- struct moonbr_listener *next_listener; /* next idle or(!) connected listener */
- int proto;
- union {
- struct {
- char *name; /* name of interval passed to 'connect' function as 'interval' field in table */
- int strict; /* nonzero = runtime of 'connect' function does not delay interval */
- struct timeval delay; /* interval between invocations of 'connect' function */
- struct timeval wakeup; /* point in time of next invocation */
- } interval;
- struct {
- union {
- struct sockaddr addr_abstract;
- struct sockaddr_un addr_un;
- struct sockaddr_in addr_in;
- struct sockaddr_in6 addr_in6;
- } addr;
- socklen_t addrlen;
- } socket;
- } type_specific;
- union {
- struct {
- char ip[INET6_ADDRSTRLEN]; /* IP to listen on */
- int port; /* port number to listen on (in host endianess) */
- } tcp;
- } proto_specific;
- int listenfd; /* -1 = none */
- int pollidx; /* -1 = none */
- };
- /* Data structure for a child process that is handling incoming connections */
- struct moonbr_worker {
- struct moonbr_pool *pool;
- struct moonbr_worker *prev_worker;
- struct moonbr_worker *next_worker;
- struct moonbr_worker *prev_idle_worker;
- struct moonbr_worker *next_idle_worker;
- int main; /* nonzero = terminate Moonbridge when this worker dies */
- int idle; /* nonzero = waiting for command from parent process */
- int assigned; /* nonzero = currently handling a connection */
- pid_t pid;
- int controlfd; /* socket to send/receive control message to/from child process */
- int errorfd; /* socket to receive error output from child process' stderr */
- char *errorlinebuf; /* optional buffer for collecting stderr data from child process */
- int errorlinelen; /* number of bytes stored in 'errorlinebuf' */
- int errorlineovf; /* nonzero = line length overflow */
- struct timeval idle_expiration; /* point in time until child process may stay in idle state */
- struct moonbr_listener *restart_interval_listener; /* set while interval listener is assigned */
- };
- /* Data structure for a pool of workers and listeners */
- struct moonbr_pool {
- int poolnum; /* number of pool for log output */
- struct moonbr_pool *next_pool; /* next entry in linked list starting with 'moonbr_first_pool' */
- struct moonbr_worker *first_worker; /* first worker of pool */
- struct moonbr_worker *last_worker; /* last worker of pool */
- struct moonbr_worker *first_idle_worker; /* first idle worker of pool */
- struct moonbr_worker *last_idle_worker; /* last idle worker of pool */
- int idle_worker_count;
- int unassigned_worker_count;
- int total_worker_count;
- int worker_count_stat; /* only needed for statistics */
- int pre_fork; /* desired minimum number of unassigned workers */
- int min_fork; /* desired minimum number of workers in total */
- int max_fork; /* maximum number of workers */
- struct timeval fork_delay; /* delay after each fork() until a fork may happen again */
- struct timeval fork_wakeup; /* point in time when a fork may happen again (unless a worker terminates before) */
- struct timeval fork_error_delay; /* delay between fork()s when an error during fork or preparation occurred */
- struct timeval fork_error_wakeup; /* point in time when fork may happen again if an error in preparation occurred */
- int use_fork_error_wakeup; /* nonzero = error in preparation occured; gets reset on next fork */
- struct timeval exit_delay; /* delay for terminating excessive workers (unassigned_worker_count > pre_fork) */
- struct timeval exit_wakeup; /* point in time when terminating an excessive worker */
- struct timeval idle_timeout; /* delay before an idle worker is terminated */
- size_t memory_limit; /* maximum bytes of memory that the Lua machine may allocate */
- int listener_count; /* total number of listeners of pool (and size of 'listener' array at end of this struct) */
- struct moonbr_listener *first_idle_listener; /* first listener that is idle (i.e. has no waiting connection) */
- struct moonbr_listener *last_idle_listener; /* last listener that is idle (i.e. has no waiting connection) */
- struct moonbr_listener *first_connected_listener; /* first listener that has a pending connection */
- struct moonbr_listener *last_connected_listener; /* last listener that has a pending connection */
- struct moonbr_listener listener[1]; /* static array of variable(!) size to contain 'listener' structures */
- };
- /* Enum for 'channel' field of struct moonbr_poll_worker */
- #define MOONBR_POLL_WORKER_CONTROLCHANNEL 1
- #define MOONBR_POLL_WORKER_ERRORCHANNEL 2
- /* Structure to refer from 'moonbr_poll_worker_fds' entry to worker structure */
- struct moonbr_poll_worker {
- struct moonbr_worker *worker;
- int channel; /* field indicating whether file descriptor is 'controlfd' or 'errorfd' */
- };
- /* Variable indicating that clean shutdown was requested */
- static int moonbr_shutdown_in_progress = 0;
- /*** Macros for Lua registry ***/
- /* Lightuserdata keys for Lua registry to store 'prepare', 'connect', and 'finish' functions */
- #define moonbr_luakey_prepare_func(pool) ((void *)(intptr_t)(pool) + 0)
- #define moonbr_luakey_connect_func(pool) ((void *)(intptr_t)(pool) + 1)
- #define moonbr_luakey_finish_func(pool) ((void *)(intptr_t)(pool) + 2)
- /*** Global variables ***/
- /* State of process execution */
- static int moonbr_pstate = MOONBR_PSTATE_STARTUP;
- /* Process ID of the main process */
- static pid_t moonbr_masterpid;
- /* Condition variables set by the signal handler */
- static volatile sig_atomic_t moonbr_cond_poll = 0;
- static volatile sig_atomic_t moonbr_cond_terminate = 0;
- static volatile sig_atomic_t moonbr_cond_interrupt = 0;
- static volatile sig_atomic_t moonbr_cond_child = 0;
- /* Socket pair to denote signal delivery when signal handler was called just before poll() */
- static int moonbr_poll_signalfds[2];
- #define moonbr_poll_signalfd_read moonbr_poll_signalfds[0]
- #define moonbr_poll_signalfd_write moonbr_poll_signalfds[1]
- /* Global variables for pidfile and logging */
- static struct pidfh *moonbr_pidfh = NULL;
- static FILE *moonbr_logfile = NULL;
- static int moonbr_use_syslog = 0;
- /* First and last entry of linked list of all created pools during initialization */
- static struct moonbr_pool *moonbr_first_pool = NULL;
- static struct moonbr_pool *moonbr_last_pool = NULL;
- /* Total count of pools */
- static int moonbr_pool_count = 0;
- /* Set to a nonzero value if dynamic part of 'moonbr_poll_fds' ('moonbr_poll_worker_fds') needs an update */
- static int moonbr_poll_refresh_needed = 0;
- /* Array passed to poll(), consisting of static part and dynamic part ('moonbr_poll_worker_fds') */
- static struct pollfd *moonbr_poll_fds = NULL; /* the array */
- static int moonbr_poll_fds_bufsize = 0; /* memory allocated for this number of elements */
- static int moonbr_poll_fds_count = 0; /* total number of elements */
- static int moonbr_poll_fds_static_count; /* number of elements in static part */
- /* Dynamic part of 'moonbr_poll_fds' array */
- #define moonbr_poll_worker_fds (moonbr_poll_fds+moonbr_poll_fds_static_count)
- /* Additional information for dynamic part of 'moonbr_poll_fds' array */
- struct moonbr_poll_worker *moonbr_poll_workers; /* the array */
- static int moonbr_poll_workers_bufsize = 0; /* memory allocated for this number of elements */
- static int moonbr_poll_worker_count = 0; /* number of elements in array */
- /* Variable set to nonzero value to disallow further calls of 'listen' function */
- static int moonbr_booted = 0;
- /* Verbosity settings */
- static int moonbr_debug = 0;
- static int moonbr_stat = 0;
- /* Memory consumption by Lua machine */
- static size_t moonbr_memory_usage = 0;
- static size_t moonbr_memory_limit = 0;
- /*** Functions for signal handling ***/
- /* Signal handler for master and child processes */
- static void moonbr_signal(int sig) {
- if (getpid() == moonbr_masterpid) {
- /* master process */
- switch (sig) {
- case SIGHUP:
- case SIGINT:
- /* fast shutdown requested */
- moonbr_cond_interrupt = 1;
- break;
- case SIGTERM:
- /* clean shutdown requested */
- moonbr_cond_terminate = 1;
- break;
- case SIGCHLD:
- /* child process terminated */
- moonbr_cond_child = 1;
- break;
- }
- if (moonbr_cond_poll) {
- /* avoid race condition if signal handler is invoked right before poll() */
- char buf[1] = {0};
- write(moonbr_poll_signalfd_write, buf, 1);
- }
- } else {
- /* child process forwards certain signals to parent process */
- switch (sig) {
- case SIGHUP:
- case SIGINT:
- case SIGTERM:
- kill(moonbr_masterpid, sig);
- }
- }
- }
- /* Initialize signal handling */
- static void moonbr_signal_init(){
- moonbr_masterpid = getpid();
- signal(SIGHUP, moonbr_signal);
- signal(SIGINT, moonbr_signal);
- signal(SIGTERM, moonbr_signal);
- signal(SIGCHLD, moonbr_signal);
- /* signal(SIGUSR1, moonbr_signal); */ /* might be used to terminate children gracefully */
- }
- /*** Functions for logging in master process ***/
- /* Logs a pre-formatted message with given syslog() priority */
- static void moonbr_log_msg(int priority, const char *msg) {
- if (moonbr_logfile) {
- /* logging to logfile desired (timestamp is prepended in that case) */
- time_t now_time = 0;
- struct tm now_tmstruct;
- char timestr[MOONBR_LOG_MAXTIMELEN+1];
- time(&now_time);
- localtime_r(&now_time, &now_tmstruct);
- if (!strftime(
- timestr, MOONBR_LOG_MAXTIMELEN+1, "%Y-%m-%d %H:%M:%S %Z: ", &now_tmstruct
- )) timestr[0] = 0;
- fprintf(moonbr_logfile, "%s%s\n", timestr, msg);
- }
- if (moonbr_use_syslog) {
- /* logging through syslog desired */
- syslog(priority, "%s", msg);
- }
- }
- /* Formats a message via vsnprintf() and logs it with given syslog() priority */
- static void moonbr_log(int priority, const char *message, ...) {
- char msgbuf[MOONBR_LOG_MAXMSGLEN+1]; /* buffer of static size to store formatted message */
- int msglen; /* length of full message (may exceed MOONBR_LOG_MAXMSGLEN) */
- {
- /* pass variable arguments to vsnprintf() to format message */
- va_list ap;
- va_start(ap, message);
- msglen = vsnprintf(msgbuf, MOONBR_LOG_MAXMSGLEN+1, message, ap);
- va_end(ap);
- }
- {
- /* split and log message line by line */
- char *line = msgbuf;
- while (1) {
- char *endptr = strchr(line, '\n');
- if (endptr) {
- /* terminate string where newline character is found */
- *endptr = 0;
- } else if (line != msgbuf && msglen > MOONBR_LOG_MAXMSGLEN) {
- /* break if line is incomplete and not the first line */
- break;
- }
- moonbr_log_msg(priority, line);
- if (!endptr) break; /* break if end of formatted message is reached */
- line = endptr+1; /* otherwise continue with remaining message */
- }
- }
- if (msglen > MOONBR_LOG_MAXMSGLEN) {
- /* print warning if message was truncated */
- moonbr_log_msg(priority, "Previous log message has been truncated due to excessive length");
- }
- }
- /*** Termination function ***/
- /* Kill all child processes, remove PID file (if existent), and exit master process with given exitcode */
- static void moonbr_terminate(int exitcode) {
- {
- struct moonbr_pool *pool;
- for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
- {
- struct moonbr_worker *worker;
- for (worker=pool->first_worker; worker; worker=worker->next_worker) {
- moonbr_log(LOG_INFO, "Sending SIGKILL to child with PID %i", (int)worker->pid);
- if (kill(worker->pid, SIGKILL)) {
- moonbr_log(LOG_ERR, "Error while killing child process: %s", strerror(errno));
- }
- }
- }
- {
- int i;
- for (i=0; i<pool->listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- if (listener->proto == MOONBR_PROTO_LOCAL) {
- moonbr_log(LOG_INFO, "Unlinking local socket \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
- if (unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
- moonbr_log(LOG_ERR, "Error while unlinking local socket: %s", strerror(errno));
- }
- }
- }
- }
- }
- }
- moonbr_log(exitcode ? LOG_ERR : LOG_NOTICE, "Terminating with exit code %i", exitcode);
- if (moonbr_pidfh && pidfile_remove(moonbr_pidfh)) {
- moonbr_log(LOG_ERR, "Error while removing PID file: %s", strerror(errno));
- }
- exit(exitcode);
- }
- /* Terminate with either MOONBR_EXITCODE_STARTUPERROR or MOONBR_EXITCODE_RUNTIMEERROR */
- #define moonbr_terminate_error() \
- moonbr_terminate( \
- moonbr_pstate == MOONBR_PSTATE_STARTUP ? \
- MOONBR_EXITCODE_STARTUPERROR : \
- MOONBR_EXITCODE_RUNTIMEERROR \
- )
- /*** Helper functions ***/
- /* Fills a 'struct timeval' structure with the current time (using CLOCK_MONOTONIC) */
- static void moonbr_now(struct timeval *now) {
- struct timespec ts = {0, };
- if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
- moonbr_log(LOG_CRIT, "Error in clock_gettime() call: %s", strerror(errno));
- moonbr_terminate_error();
- }
- *now = (struct timeval){ .tv_sec = ts.tv_sec, .tv_usec = ts.tv_nsec / 1000 };
- }
- /* Formats a 'struct timeval' value (not thread-safe) */
- static char *moonbr_format_timeval(struct timeval *t) {
- static char buf[32];
- snprintf(buf, 32, "%ji.%06ji seconds", (intmax_t)t->tv_sec, (intmax_t)t->tv_usec);
- return buf;
- }
- /*** Functions for pool creation and startup ***/
- /* Creates a 'struct moonbr_pool' structure with a given number of listeners */
- static struct moonbr_pool *moonbr_create_pool(int listener_count) {
- struct moonbr_pool *pool;
- pool = calloc(1,
- sizeof(struct moonbr_pool) + /* size of 'struct moonbr_pool' with one listener */
- (listener_count-1) * sizeof(struct moonbr_listener) /* size of extra listeners */
- );
- if (!pool) {
- moonbr_log(LOG_CRIT, "Memory allocation error");
- moonbr_terminate_error();
- }
- pool->listener_count = listener_count;
- {
- /* initialization of listeners */
- int i;
- for (i=0; i<listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- listener->pool = pool;
- listener->listenfd = -1;
- listener->pollidx = -1;
- }
- }
- return pool;
- }
- /* Destroys a 'struct moonbr_pool' structure before it has been started */
- static void moonbr_destroy_pool(struct moonbr_pool *pool) {
- int i;
- for (i=0; i<pool->listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- if (
- listener->proto == MOONBR_PROTO_INTERVAL &&
- listener->type_specific.interval.name
- ) {
- free(listener->type_specific.interval.name);
- }
- }
- free(pool);
- }
- /* Starts a all listeners in a pool */
- static int moonbr_start_pool(struct moonbr_pool *pool) {
- moonbr_log(LOG_INFO, "Creating pool", pool->poolnum);
- {
- int i;
- for (i=0; i<pool->listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- switch (listener->proto) {
- case MOONBR_PROTO_MAIN:
- /* nothing to do here: starting main thread is performed in moonbr_run() function */
- moonbr_log(LOG_INFO, "Adding main thread");
- break;
- case MOONBR_PROTO_INTERVAL:
- /* nothing to do here: starting intervals is performed in moonbr_run() function */
- if (!listener->type_specific.interval.name) {
- moonbr_log(LOG_INFO, "Adding unnamed interval listener");
- } else {
- moonbr_log(LOG_INFO, "Adding interval listener \"%s\"", listener->type_specific.interval.name);
- }
- break;
- case MOONBR_PROTO_LOCAL:
- moonbr_log(LOG_INFO, "Adding local socket listener for path \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
- listener->listenfd = socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (listener->listenfd == -1) goto moonbr_start_pool_error;
- if (!unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
- moonbr_log(LOG_WARNING, "Unlinked named socket \"%s\" prior to listening", listener->type_specific.socket.addr.addr_un.sun_path);
- } else {
- if (errno != ENOENT) {
- moonbr_log(LOG_ERR, "Could not unlink named socket \"%s\" prior to listening: %s", listener->type_specific.socket.addr.addr_un.sun_path, strerror(errno));
- }
- }
- if (
- bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
- ) goto moonbr_start_pool_error;
- if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
- break;
- case MOONBR_PROTO_TCP:
- moonbr_log(LOG_INFO, "Adding TCP listener on interface \"%s\", port %i", listener->proto_specific.tcp.ip, listener->proto_specific.tcp.port);
- listener->listenfd = socket(listener->type_specific.socket.addr.addr_abstract.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); /* NOTE: not correctly using PF_* but AF_* constants here */
- if (listener->listenfd == -1) goto moonbr_start_pool_error;
- {
- /* avoid "Address already in use" error when restarting service */
- static const int reuseval = 1;
- if (setsockopt(
- listener->listenfd, SOL_SOCKET, SO_REUSEADDR, &reuseval, sizeof(reuseval)
- )) goto moonbr_start_pool_error;
- }
- {
- /* default to send TCP RST when process terminates unexpectedly */
- static const struct linger lingerval = {
- .l_onoff = 1,
- .l_linger = 0
- };
- if (setsockopt(
- listener->listenfd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval)
- )) goto moonbr_start_pool_error;
- }
- if (
- bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
- ) goto moonbr_start_pool_error;
- if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
- break;
- default:
- moonbr_log(LOG_CRIT, "Internal error (should not happen): Unexpected value in listener.proto field");
- moonbr_terminate_error();
- }
- }
- goto moonbr_start_pool_ok;
- moonbr_start_pool_error:
- {
- int j = i;
- int errno2 = errno;
- for (; i>=0; i--) {
- struct moonbr_listener *listener = &pool->listener[i];
- if (listener->listenfd != -1) close(listener->listenfd);
- }
- errno = errno2;
- return j;
- }
- }
- moonbr_start_pool_ok:
- pool->poolnum = ++moonbr_pool_count;
- moonbr_log(LOG_INFO, "Pool #%i created", pool->poolnum);
- if (moonbr_last_pool) moonbr_last_pool->next_pool = pool;
- else moonbr_first_pool = pool;
- moonbr_last_pool = pool;
- return -1;
- }
- /*** Function to send data and a file descriptor to child process */
- /* Sends control message of one bye plus optional file descriptor plus optional pointer to child process */
- static void moonbr_send_control_message(struct moonbr_worker *worker, char status, int fd, void *ptr) {
- {
- struct iovec iovector = { .iov_base = &status, .iov_len = 1 }; /* carrying status byte */
- char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to transfer file descriptor */
- struct msghdr message = { .msg_iov = &iovector, .msg_iovlen = 1 }; /* data structure passed to sendmsg() call */
- if (moonbr_debug) {
- if (fd == -1) {
- moonbr_log(LOG_DEBUG, "Sending control message \"%c\" to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
- } else {
- moonbr_log(LOG_DEBUG, "Sending control message \"%c\" with file descriptor #%i to child process in pool #%i (PID %i)", (int)status, fd, worker->pool->poolnum, (int)worker->pid);
- }
- }
- if (fd != -1) {
- /* attach control message with file descriptor */
- message.msg_control = control_message_buffer;
- message.msg_controllen = CMSG_SPACE(sizeof(int));
- {
- struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
- control_message->cmsg_level = SOL_SOCKET;
- control_message->cmsg_type = SCM_RIGHTS;
- control_message->cmsg_len = CMSG_LEN(sizeof(int));
- memcpy(CMSG_DATA(control_message), &fd, sizeof(int));
- }
- }
- while (sendmsg(worker->controlfd, &message, MSG_NOSIGNAL) < 0) {
- if (errno == EPIPE) {
- moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- return; /* do not close socket; socket is closed when reading from it */
- }
- if (errno != EINTR) {
- moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- moonbr_terminate_error();
- }
- }
- }
- if (ptr) {
- char buf[sizeof(void *)];
- char *pos = buf;
- int len = sizeof(void *);
- ssize_t written;
- if (moonbr_debug) {
- moonbr_log(LOG_DEBUG, "Sending memory pointer to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
- }
- memcpy(buf, &ptr, sizeof(void *));
- while (len) {
- written = send(worker->controlfd, pos, len, MSG_NOSIGNAL);
- if (written > 0) {
- pos += written;
- len -= written;
- } else if (errno == EPIPE) {
- moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- return; /* do not close socket; socket is closed when reading from it */
- } else if (errno != EINTR) {
- moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- moonbr_terminate_error();
- }
- }
- }
- }
- /*** Functions running in child process ***/
- /* Logs an error in child process */
- static void moonbr_child_log(const char *message) {
- fprintf(stderr, "%s\n", message);
- }
- /* Logs a fatal error in child process and terminates process with error status */
- static void moonbr_child_log_fatal(const char *message) {
- moonbr_child_log(message);
- exit(1);
- }
- /* Logs an error in child process while appending error string for global errno variable */
- static void moonbr_child_log_errno(const char *message) {
- char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
- strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
- fprintf(stderr, "%s: %s\n", message, errmsg);
- }
- /* Logs a fatal error in child process while appending error string for errno and terminating process */
- static void moonbr_child_log_errno_fatal(const char *message) {
- moonbr_child_log_errno(message);
- exit(1);
- }
- /* Receives a control message consisting of one character plus an optional file descriptor from parent process */
- static void moonbr_child_receive_control_message(int socketfd, char *status, int *fd) {
- struct iovec iovector = { .iov_base = status, .iov_len = 1 }; /* reference to status byte variable */
- char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to receive file descriptor */
- struct msghdr message = { /* data structure passed to recvmsg() call */
- .msg_iov = &iovector,
- .msg_iovlen = 1,
- .msg_control = control_message_buffer,
- .msg_controllen = CMSG_SPACE(sizeof(int))
- };
- {
- int received;
- while ((received = recvmsg(socketfd, &message, MSG_CMSG_CLOEXEC)) < 0) {
- if (errno != EINTR) {
- moonbr_child_log_errno_fatal("Error while trying to receive connection socket from parent process");
- }
- }
- if (!received) {
- moonbr_child_log_fatal("Unexpected EOF while trying to receive connection socket from parent process");
- }
- }
- {
- struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
- if (control_message) {
- if (control_message->cmsg_level != SOL_SOCKET) {
- moonbr_child_log_fatal("Received control message with cmsg_level not equal to SOL_SOCKET");
- }
- if (control_message->cmsg_type != SCM_RIGHTS) {
- moonbr_child_log_fatal("Received control message with cmsg_type not equal to SCM_RIGHTS");
- }
- memcpy(fd, CMSG_DATA(control_message), sizeof(int));
- } else {
- *fd = -1;
- }
- }
- }
- /* Receives a pointer from parent process */
- static void *moonbr_child_receive_pointer(int socketfd) {
- char buf[sizeof(void *)];
- char *pos = buf;
- int len = sizeof(void *);
- ssize_t bytes_read;
- while (len) {
- bytes_read = recv(socketfd, pos, len, 0);
- if (bytes_read > 0) {
- pos += bytes_read;
- len -= bytes_read;
- } else if (!bytes_read) {
- moonbr_child_log_fatal("Unexpected EOF while trying to receive memory pointer from parent process");
- } else if (errno != EINTR) {
- moonbr_child_log_errno_fatal("Error while trying to receive memory pointer from parent process");
- }
- }
- {
- void *ptr; /* avoid breaking strict-aliasing rules */
- memcpy(&ptr, buf, sizeof(void *));
- return ptr;
- }
- }
- /* Main function of child process to be called after fork() and file descriptor rearrangement */
- void moonbr_child_run(struct moonbr_pool *pool, lua_State *L) {
- char controlmsg;
- int fd;
- struct itimerval notimer = { { 0, }, { 0, } };
- lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
- if (lua_isnil(L, -1)) lua_pop(L, 1);
- else if (lua_pcall(L, 0, 0, 1)) {
- fprintf(stderr, "Error in \"prepare\" function: %s\n", lua_tostring(L, -1));
- exit(1);
- }
- while (1) {
- struct moonbr_listener *listener;
- if (setitimer(ITIMER_REAL, ¬imer, NULL)) {
- moonbr_child_log_errno_fatal("Could not reset ITIMER_REAL via setitimer()");
- }
- controlmsg = MOONBR_STATUS_IDLE;
- if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
- moonbr_child_log_errno_fatal("Error while sending ready message to parent process");
- }
- moonbr_child_receive_control_message(MOONBR_FD_CONTROL, &controlmsg, &fd);
- if (!(
- (controlmsg == MOONBR_COMMAND_TERMINATE && fd == -1) ||
- (controlmsg == MOONBR_COMMAND_CONNECT)
- )) {
- moonbr_child_log_fatal("Received illegal control message from parent process");
- }
- if (controlmsg == MOONBR_COMMAND_TERMINATE) break;
- listener = moonbr_child_receive_pointer(MOONBR_FD_CONTROL);
- if (
- listener->proto != MOONBR_PROTO_LOCAL &&
- listener->proto != MOONBR_PROTO_TCP &&
- fd >= 0
- ) {
- moonbr_child_log_fatal("Received unexpected file descriptor from parent process");
- } else if (
- listener->proto != MOONBR_PROTO_MAIN &&
- listener->proto != MOONBR_PROTO_INTERVAL &&
- fd < 0
- ) {
- moonbr_child_log_fatal("Missing file descriptor from parent process");
- }
- if (fd >= 0) moonbr_io_pushhandle(L, fd);
- lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
- if (fd < 0) {
- lua_newtable(L);
- if (listener->proto == MOONBR_PROTO_MAIN) {
- lua_pushboolean(L, 1);
- lua_setfield(L, -2, "main");
- } else if (listener->proto == MOONBR_PROTO_INTERVAL) {
- lua_pushstring(L,
- listener->type_specific.interval.name ?
- listener->type_specific.interval.name : ""
- );
- lua_setfield(L, -2, "interval");
- }
- } else {
- lua_pushvalue(L, -2);
- }
- if (lua_pcall(L, 1, 1, 1)) {
- fprintf(stderr, "Error in \"connect\" function: %s\n", lua_tostring(L, -1));
- exit(1);
- }
- if (fd >= 0) moonbr_io_closehandle(L, -2, 0); /* attemt clean close */
- if (lua_type(L, -1) != LUA_TBOOLEAN || !lua_toboolean(L, -1)) break;
- #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
- lua_settop(L, 2);
- #else
- lua_settop(L, 1);
- #endif
- }
- controlmsg = MOONBR_STATUS_GOODBYE;
- if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
- moonbr_child_log_errno_fatal("Error while sending goodbye message to parent process");
- }
- if (close(MOONBR_FD_CONTROL) && errno != EINTR) {
- moonbr_child_log_errno("Error while closing control socket");
- }
- lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
- if (lua_isnil(L, -1)) lua_pop(L, 1);
- else if (lua_pcall(L, 0, 0, 1)) {
- fprintf(stderr, "Error in \"finish\" function: %s\n", lua_tostring(L, -1));
- exit(1);
- }
- lua_close(L);
- exit(0);
- }
- /*** Functions to spawn child process ***/
- /* Helper function to send an error message to a file descriptor (not needing a file stream) */
- static void moonbr_child_emergency_print(int fd, char *message) {
- size_t len = strlen(message);
- ssize_t written;
- while (len) {
- written = write(fd, message, len);
- if (written > 0) {
- message += written;
- len -= written;
- } else {
- if (written != -1 || errno != EINTR) break;
- }
- }
- }
- /* Helper function to send an error message plus a text for errno to a file descriptor and terminate the process */
- static void moonbr_child_emergency_error(int fd, char *message) {
- int errno2 = errno;
- moonbr_child_emergency_print(fd, message);
- moonbr_child_emergency_print(fd, ": ");
- moonbr_child_emergency_print(fd, strerror(errno2));
- moonbr_child_emergency_print(fd, "\n");
- exit(1);
- }
- /* Creates a child process and (in case of success) registers it in the 'struct moonbr_pool' structure */
- static int moonbr_create_worker(struct moonbr_pool *pool, lua_State *L) {
- struct moonbr_worker *worker;
- worker = calloc(1, sizeof(struct moonbr_worker));
- if (!worker) {
- moonbr_log(LOG_CRIT, "Memory allocation error");
- return -1;
- }
- worker->pool = pool;
- {
- int controlfds[2];
- int errorfds[2];
- if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, controlfds)) {
- moonbr_log(LOG_ERR, "Could not create control socket pair for communcation with child process: %s", strerror(errno));
- free(worker);
- return -1;
- }
- if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, errorfds)) {
- moonbr_log(LOG_ERR, "Could not create socket pair to redirect stderr of child process: %s", strerror(errno));
- close(controlfds[0]);
- close(controlfds[1]);
- free(worker);
- return -1;
- }
- if (moonbr_logfile && fflush(moonbr_logfile)) {
- moonbr_log(LOG_CRIT, "Could not flush log file prior to forking: %s", strerror(errno));
- moonbr_terminate_error();
- }
- worker->pid = fork();
- if (worker->pid == -1) {
- moonbr_log(LOG_ERR, "Could not fork: %s", strerror(errno));
- close(controlfds[0]);
- close(controlfds[1]);
- close(errorfds[0]);
- close(errorfds[1]);
- free(worker);
- return -1;
- } else if (!worker->pid) {
- moonbr_pstate = MOONBR_PSTATE_FORKED;
- #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
- lua_pushliteral(L, "Failed to pass error message due to bug in Lua panic handler (hint: not enough memory?)");
- #endif
- moonbr_memory_limit = pool->memory_limit;
- if (moonbr_pidfh && pidfile_close(moonbr_pidfh)) {
- moonbr_child_emergency_error(errorfds[1], "Could not close PID file in forked child process");
- }
- if (moonbr_logfile && moonbr_logfile != stderr && fclose(moonbr_logfile)) {
- moonbr_child_emergency_error(errorfds[1], "Could not close log file in forked child process");
- }
- if (dup2(errorfds[1], MOONBR_FD_STDERR) == -1) {
- moonbr_child_emergency_error(errorfds[1], "Could not duplicate socket to stderr file descriptor");
- }
- if (dup2(controlfds[1], MOONBR_FD_CONTROL) == -1) {
- moonbr_child_emergency_error(errorfds[1], "Could not duplicate control socket");
- }
- closefrom(MOONBR_FD_END);
- moonbr_child_run(pool, L);
- }
- if (moonbr_stat) {
- moonbr_log(LOG_INFO, "Created new worker in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
- }
- worker->controlfd = controlfds[0];
- worker->errorfd = errorfds[0];
- if (close(controlfds[1]) && errno != EINTR) {
- moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
- moonbr_terminate_error();
- }
- if (close(errorfds[1]) && errno != EINTR) {
- moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
- moonbr_terminate_error();
- }
- }
- worker->prev_worker = pool->last_worker;
- if (worker->prev_worker) worker->prev_worker->next_worker = worker;
- else pool->first_worker = worker;
- pool->last_worker = worker;
- pool->unassigned_worker_count++;
- pool->total_worker_count++;
- pool->worker_count_stat = 1;
- moonbr_poll_refresh_needed = 1;
- return 0; /* return zero only in case of success */
- }
- /*** Functions for queues of 'struct moonbr_listener' ***/
- /* Appends a 'struct moonbr_listener' to the queue of idle listeners and registers it for poll() */
- static void moonbr_add_idle_listener(struct moonbr_listener *listener) {
- listener->prev_listener = listener->pool->last_idle_listener;
- if (listener->prev_listener) listener->prev_listener->next_listener = listener;
- else listener->pool->first_idle_listener = listener;
- listener->pool->last_idle_listener = listener;
- if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events |= POLLIN;
- }
- /* Removes a 'struct moonbr_listener' from the queue of idle listeners and unregisters it from poll() */
- static void moonbr_remove_idle_listener(struct moonbr_listener *listener) {
- if (listener->prev_listener) listener->prev_listener->next_listener = listener->next_listener;
- else listener->pool->first_idle_listener = listener->next_listener;
- if (listener->next_listener) listener->next_listener->prev_listener = listener->prev_listener;
- else listener->pool->last_idle_listener = listener->prev_listener;
- listener->prev_listener = NULL;
- listener->next_listener = NULL;
- if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events &= ~POLLIN;
- }
- /* Adds a listener to the queue of connected listeners (i.e. waiting to have their incoming connection accepted) */
- static void moonbr_add_connected_listener(struct moonbr_listener *listener) {
- listener->prev_listener = listener->pool->last_connected_listener;
- if (listener->prev_listener) listener->prev_listener->next_listener = listener;
- else listener->pool->first_connected_listener = listener;
- listener->pool->last_connected_listener = listener;
- }
- /* Removes and returns the first connected listener in the queue */
- static struct moonbr_listener *moonbr_pop_connected_listener(struct moonbr_pool *pool) {
- struct moonbr_listener *listener = pool->first_connected_listener;
- listener->pool->first_connected_listener = listener->next_listener;
- if (listener->pool->first_connected_listener) listener->pool->first_connected_listener->prev_listener = NULL;
- else listener->pool->last_connected_listener = NULL;
- listener->next_listener = NULL;
- return listener;
- }
- /*** Functions to handle polling ***/
- /* Returns an index to a new initialized entry in moonbr_poll_fds[] */
- int moonbr_poll_fds_nextindex() {
- if (moonbr_poll_fds_count >= moonbr_poll_fds_bufsize) {
- if (moonbr_poll_fds_bufsize) moonbr_poll_fds_bufsize *= 2;
- else moonbr_poll_fds_bufsize = 1;
- moonbr_poll_fds = realloc(
- moonbr_poll_fds, moonbr_poll_fds_bufsize * sizeof(struct pollfd)
- );
- if (!moonbr_poll_fds) {
- moonbr_log(LOG_CRIT, "Memory allocation error");
- moonbr_terminate_error();
- }
- }
- moonbr_poll_fds[moonbr_poll_fds_count] = (struct pollfd){0, };
- return moonbr_poll_fds_count++;
- }
- /* Returns an index to a new initialized entry in moonbr_poll_workers[] */
- int moonbr_poll_workers_nextindex() {
- if (moonbr_poll_worker_count >= moonbr_poll_workers_bufsize) {
- if (moonbr_poll_workers_bufsize) moonbr_poll_workers_bufsize *= 2;
- else moonbr_poll_workers_bufsize = 1;
- moonbr_poll_workers = realloc(
- moonbr_poll_workers, moonbr_poll_workers_bufsize * sizeof(struct moonbr_poll_worker)
- );
- if (!moonbr_poll_workers) {
- moonbr_log(LOG_CRIT, "Memory allocation error");
- moonbr_terminate_error();
- }
- }
- moonbr_poll_workers[moonbr_poll_worker_count] = (struct moonbr_poll_worker){0, };
- return moonbr_poll_worker_count++;
- }
- /* Queues all listeners as idle, and initializes static part of moonbr_poll_fds[], which is passed to poll() */
- static void moonbr_poll_init() {
- if (socketpair(
- PF_LOCAL,
- SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
- 0,
- moonbr_poll_signalfds
- )) {
- moonbr_log(LOG_CRIT, "Could not create socket pair for signal delivery during polling: %s", strerror(errno));
- moonbr_terminate_error();
- }
- {
- int j = moonbr_poll_fds_nextindex();
- struct pollfd *pollfd = &moonbr_poll_fds[j];
- pollfd->fd = moonbr_poll_signalfd_read;
- pollfd->events = POLLIN;
- }
- {
- struct moonbr_pool *pool;
- for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
- int i;
- for (i=0; i<pool->listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- if (listener->listenfd != -1) {
- int j = moonbr_poll_fds_nextindex();
- listener->pollidx = j;
- moonbr_poll_fds[j].fd = listener->listenfd;
- }
- moonbr_add_idle_listener(listener);
- }
- }
- }
- moonbr_poll_fds_static_count = moonbr_poll_fds_count; /* remember size of static part of array */
- }
- /* Disables polling of all listeners (required for clean shutdown) */
- static void moonbr_poll_shutdown() {
- int i;
- for (i=1; i<moonbr_poll_fds_static_count; i++) {
- moonbr_poll_fds[i].fd = -1;
- }
- }
- /* (Re)builds dynamic part of moonbr_poll_fds[] array, and (re)builds moonbr_poll_workers[] array */
- static void moonbr_poll_refresh() {
- moonbr_poll_refresh_needed = 0;
- moonbr_poll_fds_count = moonbr_poll_fds_static_count;
- moonbr_poll_worker_count = 0;
- {
- struct moonbr_pool *pool;
- for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
- struct moonbr_worker *worker;
- for (worker=pool->first_worker; worker; worker=worker->next_worker) {
- if (worker->controlfd != -1) {
- int j = moonbr_poll_fds_nextindex();
- int k = moonbr_poll_workers_nextindex();
- struct pollfd *pollfd = &moonbr_poll_fds[j];
- struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
- pollfd->fd = worker->controlfd;
- pollfd->events = POLLIN;
- poll_worker->channel = MOONBR_POLL_WORKER_CONTROLCHANNEL;
- poll_worker->worker = worker;
- }
- if (worker->errorfd != -1) {
- int j = moonbr_poll_fds_nextindex();
- int k = moonbr_poll_workers_nextindex();
- struct pollfd *pollfd = &moonbr_poll_fds[j];
- struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
- pollfd->fd = worker->errorfd;
- pollfd->events = POLLIN;
- poll_worker->channel = MOONBR_POLL_WORKER_ERRORCHANNEL;
- poll_worker->worker = worker;
- }
- }
- }
- }
- }
- /* resets socket and 'revents' field of moonbr_poll_fds[] for signal delivery just before poll() is called */
- static void moonbr_poll_reset_signal() {
- ssize_t readcount;
- char buf[1];
- moonbr_poll_fds[0].revents = 0;
- while ((readcount = read(moonbr_poll_signalfd_read, buf, 1)) < 0) {
- if (errno == EAGAIN) break;
- if (errno != EINTR) {
- moonbr_log(LOG_CRIT, "Error while reading from signal delivery socket: %s", strerror(errno));
- moonbr_terminate_error();
- }
- }
- if (!readcount) {
- moonbr_log(LOG_CRIT, "Unexpected EOF when reading from signal delivery socket: %s", strerror(errno));
- moonbr_terminate_error();
- }
- }
- /*** Shutdown initiation ***/
- /* Sets global variable 'moonbr_shutdown_in_progress', closes listeners, and demands worker termination */
- static void moonbr_initiate_shutdown() {
- struct moonbr_pool *pool;
- int i;
- if (moonbr_shutdown_in_progress) {
- moonbr_log(LOG_NOTICE, "Shutdown already in progress");
- return;
- }
- moonbr_shutdown_in_progress = 1;
- moonbr_log(LOG_NOTICE, "Initiate shutdown");
- for (pool = moonbr_first_pool; pool; pool = pool->next_pool) {
- for (i=0; i<pool->listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- if (listener->listenfd != -1) {
- if (close(listener->listenfd) && errno != EINTR) {
- moonbr_log(LOG_CRIT, "Could not close listening socket: %s", strerror(errno));
- moonbr_terminate_error();
- }
- }
- }
- }
- moonbr_poll_shutdown(); /* avoids loops due to error condition when polling closed listeners */
- /* sending SIGUSR1 to children might be used to terminate children gracefully */
- /*
- {
- pid_t pgrp = getpgrp();
- moonbr_log(LOG_INFO, "Sending SIGUSR1 to all processes in group %i", (int)pgrp);
- if (killpg(pgrp, SIGUSR1)) {
- moonbr_log(LOG_WARNING, "Error while sending SIGUSR1 to own process group: %s", strerror(errno));
- }
- }
- */
- }
- /*** Functions to handle previously created 'struct moonbr_worker' structures ***/
- #define moonbr_try_destroy_worker_stat(str, field) \
- moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: " str " %li", worker->pool->poolnum, (int)worker->pid, (long)childusage.field);
- /* Destroys a worker structure if socket connections have been closed and child process has terminated */
- static int moonbr_try_destroy_worker(struct moonbr_worker *worker) {
- if (worker->controlfd != -1 || worker->errorfd != -1) return MOONBR_DESTROY_NONE;
- {
- int childstatus;
- struct rusage childusage;
- {
- pid_t waitedpid;
- while (
- (waitedpid = wait4(worker->pid, &childstatus, WNOHANG, &childusage)) == -1
- ) {
- if (errno != EINTR) {
- moonbr_log(LOG_CRIT, "Error in wait4() call: %s", strerror(errno));
- moonbr_terminate_error();
- }
- }
- if (!waitedpid) return 0; /* return 0 if worker couldn't be destroyed */
- if (waitedpid != worker->pid) {
- moonbr_log(LOG_CRIT, "Wrong PID returned by wait4() call");
- moonbr_terminate_error();
- }
- }
- if (WIFEXITED(childstatus)) {
- if (WEXITSTATUS(childstatus) || moonbr_stat) {
- moonbr_log(
- WEXITSTATUS(childstatus) ? LOG_WARNING : LOG_INFO,
- "Child process in pool #%i with PID %i returned with exit code %i", worker->pool->poolnum, (int)worker->pid, WEXITSTATUS(childstatus)
- );
- }
- } else if (WIFSIGNALED(childstatus)) {
- if (WCOREDUMP(childstatus)) {
- moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i (core dump was created)", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
- } else if (WTERMSIG(childstatus) == SIGALRM) {
- moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i exited prematurely due to timeout", worker->pool->poolnum, (int)worker->pid);
- } else {
- moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
- }
- } else {
- moonbr_log(LOG_CRIT, "Illegal exit status from child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
- moonbr_terminate_error();
- }
- if (moonbr_stat) {
- moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: user time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_utime));
- moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: system time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_stime));
- moonbr_try_destroy_worker_stat("max resident set size", ru_maxrss);
- moonbr_try_destroy_worker_stat("integral shared memory size", ru_ixrss);
- moonbr_try_destroy_worker_stat("integral unshared data", ru_idrss);
- moonbr_try_destroy_worker_stat("integral unshared stack", ru_isrss);
- moonbr_try_destroy_worker_stat("page replaims", ru_minflt);
- moonbr_try_destroy_worker_stat("page faults", ru_majflt);
- moonbr_try_destroy_worker_stat("swaps", ru_nswap);
- moonbr_try_destroy_worker_stat("block input operations", ru_inblock);
- moonbr_try_destroy_worker_stat("block output operations", ru_oublock);
- moonbr_try_destroy_worker_stat("messages sent", ru_msgsnd);
- moonbr_try_destroy_worker_stat("messages received", ru_msgrcv);
- moonbr_try_destroy_worker_stat("signals received", ru_nsignals);
- moonbr_try_destroy_worker_stat("voluntary context switches", ru_nvcsw);
- moonbr_try_destroy_worker_stat("involuntary context switches", ru_nivcsw);
- }
- }
- {
- int retval = (
- (worker->idle || worker->assigned) ?
- MOONBR_DESTROY_IDLE_OR_ASSIGNED :
- MOONBR_DESTROY_PREPARE
- );
- if (worker->main) moonbr_initiate_shutdown();
- if (worker->prev_worker) worker->prev_worker->next_worker = worker->next_worker;
- else worker->pool->first_worker = worker->next_worker;
- if (worker->next_worker) worker->next_worker->prev_worker = worker->prev_worker;
- else worker->pool->last_worker = worker->prev_worker;
- if (worker->idle) {
- if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker->next_idle_worker;
- else worker->pool->first_idle_worker = worker->next_idle_worker;
- if (worker->next_idle_worker) worker->next_idle_worker->prev_idle_worker = worker->prev_idle_worker;
- else worker->pool->last_idle_worker = worker->prev_idle_worker;
- worker->pool->idle_worker_count--;
- }
- if (!worker->assigned) worker->pool->unassigned_worker_count--;
- worker->pool->total_worker_count--;
- worker->pool->worker_count_stat = 1;
- if (worker->errorlinebuf) free(worker->errorlinebuf);
- free(worker);
- return retval;
- }
- }
- /* Marks a worker as idle and stores it in a queue, optionally setting 'idle_expiration' value */
- static void moonbr_add_idle_worker(struct moonbr_worker *worker) {
- worker->prev_idle_worker = worker->pool->last_idle_worker;
- if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker;
- else worker->pool->first_idle_worker = worker;
- worker->pool->last_idle_worker = worker;
- worker->idle = 1;
- worker->pool->idle_worker_count++;
- if (worker->assigned) {
- worker->assigned = 0;
- worker->pool->unassigned_worker_count++;
- }
- worker->pool->worker_count_stat = 1;
- if (timerisset(&worker->pool->idle_timeout)) {
- struct timeval now;
- moonbr_now(&now);
- timeradd(&now, &worker->pool->idle_timeout, &worker->idle_expiration);
- }
- }
- /* Pops a worker from the queue of idle workers (idle queue must not be empty) */
- static struct moonbr_worker *moonbr_pop_idle_worker(struct moonbr_pool *pool) {
- struct moonbr_worker *worker;
- worker = pool->first_idle_worker;
- pool->first_idle_worker = worker->next_idle_worker;
- if (pool->first_idle_worker) pool->first_idle_worker->prev_idle_worker = NULL;
- else pool->last_idle_worker = NULL;
- worker->next_idle_worker = NULL;
- worker->idle = 0;
- worker->pool->idle_worker_count--;
- worker->assigned = 1;
- worker->pool->unassigned_worker_count--;
- worker->pool->worker_count_stat = 1;
- return worker;
- }
- /*** Functions to communicate with child processes ***/
- /* Tells child process to terminate */
- static void moonbr_terminate_idle_worker(struct moonbr_worker *worker) {
- moonbr_send_control_message(worker, MOONBR_COMMAND_TERMINATE, -1, NULL);
- }
- /* Handles status messages from child process */
- static void moonbr_read_controlchannel(struct moonbr_worker *worker) {
- char controlmsg;
- {
- ssize_t bytes_read;
- while ((bytes_read = read(worker->controlfd, &controlmsg, 1)) <= 0) {
- if (bytes_read == 0 || errno == ECONNRESET) {
- moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i unexpectedly closed control socket", worker->pool->poolnum, (int)worker->pid);
- if (close(worker->controlfd) && errno != EINTR) {
- moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- moonbr_terminate_error();
- }
- worker->controlfd = -1;
- moonbr_poll_refresh_needed = 1;
- return;
- }
- if (errno != EINTR) {
- moonbr_log(LOG_CRIT, "Unexpected error while reading control socket from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- moonbr_terminate_error();
- }
- }
- }
- if (worker->idle) {
- moonbr_log(LOG_CRIT, "Unexpected data from supposedly idle child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
- moonbr_terminate_error();
- }
- if (moonbr_debug) {
- moonbr_log(LOG_DEBUG, "Received control message from child in pool #%i with PID %i: \"%c\"", worker->pool->poolnum, (int)worker->pid, (int)controlmsg);
- }
- switch (controlmsg) {
- case MOONBR_STATUS_IDLE:
- if (moonbr_stat) {
- moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i reports as idle", worker->pool->poolnum, (int)worker->pid);
- }
- moonbr_add_idle_worker(worker);
- break;
- case MOONBR_STATUS_GOODBYE:
- if (moonbr_stat) {
- moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i announced termination", worker->pool->poolnum, (int)worker->pid);
- }
- if (close(worker->controlfd) && errno != EINTR) {
- moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- moonbr_terminate_error();
- }
- worker->controlfd = -1;
- moonbr_poll_refresh_needed = 1;
- break;
- default:
- moonbr_log(LOG_CRIT, "Received illegal data (\"%c\") while reading control socket from child process in pool #%i with PID %i", (int)controlmsg, worker->pool->poolnum, (int)worker->pid);
- moonbr_terminate_error();
- }
- }
- /* Handles stderr stream from child process */
- static void moonbr_read_errorchannel(struct moonbr_worker *worker) {
- char staticbuf[MOONBR_MAXERRORLINELEN+1];
- char *buf = worker->errorlinebuf;
- if (!buf) buf = staticbuf;
- {
- ssize_t bytes_read;
- while (
- (bytes_read = read(
- worker->errorfd,
- buf + worker->errorlinelen,
- MOONBR_MAXERRORLINELEN+1 - worker->errorlinelen
- )) <= 0
- ) {
- if (bytes_read == 0 || errno == ECONNRESET) {
- if (moonbr_debug) {
- moonbr_log(LOG_DEBUG, "Child process in pool #%i with PID %i closed stderr socket", worker->pool->poolnum, (int)worker->pid);
- }
- if (close(worker->errorfd) && errno != EINTR) {
- moonbr_log(LOG_CRIT, "Error while closing stderr socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- moonbr_terminate_error();
- }
- worker->errorfd = -1;
- moonbr_poll_refresh_needed = 1;
- break;
- }
- if (errno != EINTR) {
- moonbr_log(LOG_CRIT, "Unexpected error while reading stderr from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
- moonbr_terminate_error();
- }
- }
- worker->errorlinelen += bytes_read;
- }
- {
- int i;
- for (i=0; i<worker->errorlinelen; i++) {
- if (buf[i] == '\n') buf[i] = 0;
- if (!buf[i]) {
- if (worker->errorlineovf) {
- worker->errorlineovf = 0;
- } else {
- moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, buf);
- }
- worker->errorlinelen -= i+1;
- memmove(buf, buf+i+1, worker->errorlinelen);
- i = -1;
- }
- }
- if (i > MOONBR_MAXERRORLINELEN) {
- buf[MOONBR_MAXERRORLINELEN] = 0;
- if (!worker->errorlineovf) {
- moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i (line has been truncated): %s", worker->pool->poolnum, (int)worker->pid, buf);
- }
- worker->errorlinelen = 0;
- worker->errorlineovf = 1;
- }
- }
- if (!worker->errorlinebuf && worker->errorlinelen) { /* allocate buffer on heap only if necessary */
- worker->errorlinebuf = malloc((MOONBR_MAXERRORLINELEN+1) * sizeof(char));
- if (!worker->errorlinebuf) {
- moonbr_log(LOG_CRIT, "Memory allocation error");
- moonbr_terminate_error();
- }
- memcpy(worker->errorlinebuf, staticbuf, worker->errorlinelen);
- }
- }
- /*** Handler for incoming connections ***/
- /* Accepts one or more incoming connections on listener socket and passes it to worker(s) popped from idle queue */
- static void moonbr_connect(struct moonbr_pool *pool) {
- struct moonbr_listener *listener = moonbr_pop_connected_listener(pool);
- struct moonbr_worker *worker;
- if (listener->proto == MOONBR_PROTO_MAIN) {
- worker = moonbr_pop_idle_worker(pool);
- if (moonbr_stat) {
- moonbr_log(LOG_INFO, "Dispatching main thread of pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
- }
- worker->main = 1;
- moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
- /* do not push listener to queue of idle listeners */
- } else if (listener->proto == MOONBR_PROTO_INTERVAL) {
- worker = moonbr_pop_idle_worker(pool);
- if (moonbr_stat) {
- moonbr_log(LOG_INFO, "Dispatching interval timer \"%s\" of pool #%i to PID %i", listener->type_specific.interval.name, listener->pool->poolnum, (int)worker->pid);
- }
- worker->restart_interval_listener = listener;
- moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
- /* do not push listener to queue of idle listeners yet */
- } else {
- int peerfd;
- do {
- #if defined(__linux__) && !defined(_GNU_SOURCE)
- peerfd = accept(listener->listenfd, NULL, NULL);
- if (peerfd != -1) {
- if (fcntl(peerfd, F_SETFD, FD_CLOEXEC) == -1) {
- moonbr_log(LOG_ERR, "Error in fcntl() call: %s", strerror(errno));
- moonbr_terminate_error();
- }
- }
- #else
- peerfd = accept4(listener->listenfd, NULL, NULL, SOCK_CLOEXEC);
- #endif
- if (peerfd == -1) {
- if (errno == EWOULDBLOCK) {
- break;
- } else if (errno == ECONNABORTED) {
- moonbr_log(LOG_WARNING, "Connection aborted before accepting it");
- break;
- } else if (errno != EINTR) {
- moonbr_log(LOG_ERR, "Could not accept socket connection: %s", strerror(errno));
- moonbr_terminate_error();
- }
- } else {
- worker = moonbr_pop_idle_worker(pool);
- if (moonbr_stat) {
- moonbr_log(LOG_INFO, "Dispatching connection for pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
- }
- moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, peerfd, listener);
- if (close(peerfd) && errno != EINTR) {
- moonbr_log(LOG_ERR, "Could not close incoming socket connection in parent process: %s", strerror(errno));
- moonbr_terminate_error();
- }
- }
- } while (pool->first_idle_worker);
- moonbr_add_idle_listener(listener);
- }
- }
- /*** Functions to initialize and restart interval timers ***/
- /* Initializes all interval timers */
- static void moonbr_interval_initialize() {
- struct timeval now;
- struct moonbr_pool *pool;
- moonbr_now(&now);
- for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
- int i;
- for (i=0; i<pool->listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- if (listener->proto == MOONBR_PROTO_INTERVAL) {
- timeradd(
- &now,
- &listener->type_specific.interval.delay,
- &listener->type_specific.interval.wakeup
- );
- }
- }
- }
- }
- /* If necessary, restarts interval timers and queues interval listener as idle after a worker changed status */
- static void moonbr_interval_restart(
- struct moonbr_worker *worker,
- struct timeval *now /* passed to synchronize with moonbr_run() function */
- ) {
- struct moonbr_listener *listener = worker->restart_interval_listener;
- if (listener) {
- moonbr_add_idle_listener(listener);
- worker->restart_interval_listener = NULL;
- if (listener->type_specific.interval.strict) {
- timeradd(
- &listener->type_specific.interval.wakeup,
- &listener->type_specific.interval.delay,
- &listener->type_specific.interval.wakeup
- );
- if (timercmp(&listener->type_specific.interval.wakeup, now, <)) {
- listener->type_specific.interval.wakeup = *now;
- }
- } else {
- timeradd(
- now,
- &listener->type_specific.interval.delay,
- &listener->type_specific.interval.wakeup
- );
- }
- }
- }
- /*** Main loop and helper functions ***/
- /* Stores the earliest required wakeup time in 'wait' variable */
- static void moonbr_calc_wait(struct timeval *wait, struct timeval *wakeup) {
- if (!timerisset(wait) || timercmp(wakeup, wait, <)) *wait = *wakeup;
- }
- /* Main loop of Moonbridge system (including initialization of signal handlers and polling structures) */
- static void moonbr_run(lua_State *L) {
- struct timeval now;
- struct moonbr_pool *pool;
- struct moonbr_worker *worker;
- struct moonbr_worker *next_worker; /* needed when worker is removed during iteration of workers */
- struct moonbr_listener *listener;
- struct moonbr_listener *next_listener; /* needed when listener is removed during iteration of listeners */
- int i;
- moonbr_poll_init(); /* must be executed before moonbr_signal_init() */
- moonbr_signal_init();
- moonbr_interval_initialize();
- moonbr_pstate = MOONBR_PSTATE_RUNNING;
- while (1) {
- struct timeval wait = {0, }; /* point in time when premature wakeup of poll() is required */
- if (moonbr_cond_interrupt) {
- moonbr_log(LOG_WARNING, "Fast shutdown requested");
- moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
- }
- if (moonbr_cond_terminate) {
- moonbr_initiate_shutdown();
- moonbr_cond_terminate = 0;
- }
- moonbr_cond_child = 0; /* must not be reset between moonbr_try_destroy_worker() and poll() */
- moonbr_now(&now);
- for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
- int terminated_worker_count = 0; /* allows shortcut for new worker creation */
- /* terminate idle workers when expired */
- if (timerisset(&pool->idle_timeout)) {
- while ((worker = pool->first_idle_worker) != NULL) {
- if (timercmp(&worker->idle_expiration, &now, >)) break;
- moonbr_pop_idle_worker(pool);
- moonbr_terminate_idle_worker(worker);
- }
- }
- /* mark listeners as connected when incoming connection is pending */
- for (listener=pool->first_idle_listener; listener; listener=next_listener) {
- next_listener = listener->next_listener; /* extra variable necessary due to changing list */
- if (listener->pollidx != -1) {
- if (moonbr_poll_fds[listener->pollidx].revents) {
- moonbr_poll_fds[listener->pollidx].revents = 0;
- moonbr_remove_idle_listener(listener);
- moonbr_add_connected_listener(listener);
- }
- } else if (
- listener->proto != MOONBR_PROTO_INTERVAL ||
- !timercmp(&listener->type_specific.interval.wakeup, &now, >)
- ) {
- moonbr_remove_idle_listener(listener);
- moonbr_add_connected_listener(listener);
- }
- }
- /* process input from child processes */
- for (i=0; i<moonbr_poll_worker_count; i++) {
- if (moonbr_poll_worker_fds[i].revents) {
- moonbr_poll_worker_fds[i].revents = 0;
- struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[i];
- switch (poll_worker->channel) {
- case MOONBR_POLL_WORKER_CONTROLCHANNEL:
- moonbr_read_controlchannel(poll_worker->worker);
- moonbr_interval_restart(poll_worker->worker, &now);
- break;
- case MOONBR_POLL_WORKER_ERRORCHANNEL:
- moonbr_read_errorchannel(poll_worker->worker);
- break;
- }
- }
- }
- /* collect dead child processes */
- for (worker=pool->first_worker; worker; worker=next_worker) {
- next_worker = worker->next_worker; /* extra variable necessary due to changing list */
- switch (moonbr_try_destroy_worker(worker)) {
- case MOONBR_DESTROY_PREPARE:
- pool->use_fork_error_wakeup = 1;
- break;
- case MOONBR_DESTROY_IDLE_OR_ASSIGNED:
- terminated_worker_count++;
- break;
- }
- }
- if (!moonbr_shutdown_in_progress) {
- /* connect listeners with idle workers */
- while (pool->first_connected_listener && pool->first_idle_worker) {
- moonbr_connect(pool);
- }
- /* create new worker processes */
- while (
- pool->total_worker_count < pool->max_fork && (
- pool->unassigned_worker_count < pool->pre_fork ||
- pool->total_worker_count < pool->min_fork
- )
- ) {
- if (pool->use_fork_error_wakeup) {
- if (timercmp(&pool->fork_error_wakeup, &now, >)) {
- moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
- break;
- }
- } else {
- if (terminated_worker_count) {
- terminated_worker_count--;
- } else if (timercmp(&pool->fork_wakeup, &now, >)) {
- moonbr_calc_wait(&wait, &pool->fork_wakeup);
- break;
- }
- }
- if (moonbr_create_worker(pool, L)) {
- /* on error, enforce error delay */
- timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
- pool->use_fork_error_wakeup = 1;
- moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
- break;
- } else {
- /* normal fork delay on success */
- timeradd(&now, &pool->fork_delay, &pool->fork_wakeup);
- timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
- pool->use_fork_error_wakeup = 0; /* gets set later if error occures during preparation */
- }
- }
- /* terminate excessive worker processes */
- while (
- pool->total_worker_count > pool->min_fork &&
- pool->idle_worker_count > pool->pre_fork
- ) {
- if (timerisset(&pool->exit_wakeup)) {
- if (timercmp(&pool->exit_wakeup, &now, >)) {
- moonbr_calc_wait(&wait, &pool->exit_wakeup);
- break;
- }
- moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
- timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
- } else {
- timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
- break;
- }
- }
- if (!(
- pool->total_worker_count > pool->min_fork &&
- pool->idle_worker_count > pool->pre_fork
- )) {
- timerclear(&pool->exit_wakeup); /* timer gets restarted later when there are excessive workers */
- }
- }
- /* optionally output worker count stats */
- if (moonbr_stat && pool->worker_count_stat) {
- pool->worker_count_stat = 0;
- moonbr_log(
- LOG_INFO,
- "Worker count for pool #%i: %i idle, %i assigned, %i total",
- pool->poolnum, pool->idle_worker_count,
- pool->total_worker_count - pool->unassigned_worker_count,
- pool->total_worker_count);
- }
- /* calculate wakeup time for interval listeners */
- for (listener=pool->first_idle_listener; listener; listener=listener->next_listener) {
- if (listener->proto == MOONBR_PROTO_INTERVAL) {
- moonbr_calc_wait(&wait, &listener->type_specific.interval.wakeup);
- }
- }
- /* calculate wakeup time for idle workers (only first idle worker is significant) */
- if (timerisset(&pool->idle_timeout) && pool->first_idle_worker) {
- moonbr_calc_wait(&wait, &pool->first_idle_worker->idle_expiration);
- }
- }
- /* terminate idle workers in case of shutdown and check if shutdown is complete */
- if (moonbr_shutdown_in_progress) {
- int remaining = 0;
- for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
- while (pool->idle_worker_count) {
- moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
- }
- if (pool->first_worker) remaining = 1;
- }
- if (!remaining) {
- moonbr_log(LOG_INFO, "All worker threads have terminated");
- moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
- }
- }
- if (moonbr_poll_refresh_needed) moonbr_poll_refresh();
- moonbr_cond_poll = 1;
- if (!moonbr_cond_child && !moonbr_cond_terminate && !moonbr_cond_interrupt) {
- int timeout;
- if (timerisset(&wait)) {
- if (timercmp(&wait, &now, <)) {
- moonbr_log(LOG_CRIT, "Internal error (should not happen): Future is in the past");
- moonbr_terminate_error();
- }
- timersub(&wait, &now, &wait);
- timeout = wait.tv_sec * 1000 + wait.tv_usec / 1000;
- } else {
- timeout = INFTIM;
- }
- if (moonbr_debug) {
- moonbr_log(LOG_DEBUG, "Waiting for I/O");
- }
- poll(moonbr_poll_fds, moonbr_poll_fds_count, timeout);
- } else {
- if (moonbr_debug) {
- moonbr_log(LOG_DEBUG, "Do not wait for I/O");
- }
- }
- moonbr_cond_poll = 0;
- moonbr_poll_reset_signal();
- }
- }
- /*** Lua interface ***/
- static int moonbr_lua_panic(lua_State *L) {
- const char *errmsg;
- errmsg = lua_tostring(L, -1);
- if (!errmsg) {
- if (lua_isnoneornil(L, -1)) errmsg = "(error message is nil)";
- else errmsg = "(error message is not a string)";
- }
- if (moonbr_pstate == MOONBR_PSTATE_FORKED) {
- fprintf(stderr, "Uncaught Lua error: %s\n", errmsg);
- exit(1);
- } else {
- moonbr_log(LOG_CRIT, "Uncaught Lua error: %s", errmsg);
- moonbr_terminate_error();
- }
- return 0;
- }
- static int moonbr_addtraceback(lua_State *L) {
- luaL_traceback(L, L, luaL_tolstring(L, 1, NULL), 1);
- return 1;
- }
- /* Memory allocator that allows limiting memory consumption */
- static void *moonbr_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
- (void)ud; /* not used */
- if (nsize == 0) {
- if (ptr) {
- moonbr_memory_usage -= osize;
- free(ptr);
- }
- return NULL;
- } else if (ptr) {
- if (
- moonbr_memory_limit &&
- nsize > osize &&
- moonbr_memory_usage + (nsize - osize) > moonbr_memory_limit
- ) {
- return NULL;
- } else {
- ptr = realloc(ptr, nsize);
- if (ptr) moonbr_memory_usage += nsize - osize;
- }
- } else {
- if (
- moonbr_memory_limit &&
- moonbr_memory_usage + nsize > moonbr_memory_limit
- ) {
- return NULL;
- } else {
- ptr = realloc(ptr, nsize);
- if (ptr) moonbr_memory_usage += nsize;
- }
- }
- return ptr;
- }
- static int moonbr_lua_tonatural(lua_State *L, int idx) {
- int isnum;
- lua_Number n;
- n = lua_tonumberx(L, idx, &isnum);
- if (isnum && n>=0 && n<INT_MAX && (lua_Number)(int)n == n) return n;
- else return -1;
- }
- static int moonbr_lua_totimeval(lua_State *L, int idx, struct timeval *value) {
- int isnum;
- lua_Number n;
- n = lua_tonumberx(L, idx, &isnum);
- if (isnum && n>=0 && n<=100000000) {
- value->tv_sec = n;
- value->tv_usec = 1e6 * (n - value->tv_sec);
- return 1;
- } else {
- return 0;
- }
- }
- static int moonbr_timeout(lua_State *L) {
- struct itimerval oldval;
- if (lua_isnoneornil(L, 1) && lua_isnoneornil(L, 2)) {
- getitimer(ITIMER_REAL, &oldval);
- } else {
- struct itimerval newval = {};
- timerclear(&newval.it_interval);
- timerclear(&newval.it_value);
- if (lua_toboolean(L, 1)) {
- luaL_argcheck(
- L, moonbr_lua_totimeval(L, 1, &newval.it_value), 1,
- "interval in seconds expected"
- );
- }
- if (lua_isnoneornil(L, 2)) {
- if (setitimer(ITIMER_REAL, &newval, &oldval)) {
- moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
- moonbr_terminate_error();
- }
- } else {
- getitimer(ITIMER_REAL, &oldval);
- if (!timerisset(&oldval.it_value)) {
- if (setitimer(ITIMER_REAL, &newval, NULL)) {
- moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
- moonbr_terminate_error();
- }
- lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
- timerclear(&newval.it_value);
- if (setitimer(ITIMER_REAL, &newval, NULL)) {
- moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
- moonbr_terminate_error();
- }
- } else if (timercmp(&newval.it_value, &oldval.it_value, <)) {
- struct itimerval remval;
- if (setitimer(ITIMER_REAL, &newval, NULL)) {
- moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
- moonbr_terminate_error();
- }
- lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
- getitimer(ITIMER_REAL, &remval);
- timersub(&oldval.it_value, &newval.it_value, &newval.it_value);
- timeradd(&newval.it_value, &remval.it_value, &newval.it_value);
- if (setitimer(ITIMER_REAL, &newval, NULL)) {
- moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
- moonbr_terminate_error();
- }
- } else {
- lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
- }
- return lua_gettop(L) - 1;
- }
- }
- lua_pushnumber(L, oldval.it_value.tv_sec + 1e-6 * oldval.it_value.tv_usec);
- return 1;
- }
- #define moonbr_listen_init_pool_forkoption(luaname, cname, defval) { \
- lua_getfield(L, 2, luaname); \
- pool->cname = lua_isnil(L, -1) ? (defval) : moonbr_lua_tonatural(L, -1); \
- } while(0)
- #define moonbr_listen_init_pool_timeoption(luaname, cname, defval, defvalu) ( \
- lua_getfield(L, 2, luaname), \
- lua_isnil(L, -1) ? ( \
- pool->cname.tv_sec = (defval), pool->cname.tv_usec = (defvalu), \
- 1 \
- ) : ( \
- (lua_isboolean(L, -1) && !lua_toboolean(L, -1)) ? ( \
- pool->cname.tv_sec = 0, pool->cname.tv_usec = 0, \
- 1 \
- ) : ( \
- moonbr_lua_totimeval(L, -1, &pool->cname) \
- ) \
- ) \
- )
- static int moonbr_listen_init_pool(lua_State *L) {
- struct moonbr_pool *pool;
- const char *proto;
- int i;
- int dynamic = 0; /* nonzero = listeners exist which require dynamic worker creation */
- pool = lua_touserdata(L, 1);
- for (i=0; i<pool->listener_count; i++) {
- struct moonbr_listener *listener = &pool->listener[i];
- lua_settop(L, 2);
- #if LUA_VERSION_NUM >= 503
- lua_geti(L, 2, i+1);
- #else
- lua_pushinteger(L, i+1);
- lua_gettable(L, 2);
- #endif
- lua_getfield(L, 3, "proto");
- proto = lua_tostring(L, -1);
- if (proto && !strcmp(proto, "main")) {
- listener->proto = MOONBR_PROTO_MAIN;
- } else if (proto && !strcmp(proto, "interval")) {
- dynamic = 1;
- listener->proto = MOONBR_PROTO_INTERVAL;
- lua_getfield(L, 3, "name");
- {
- const char *name = lua_tostring(L, -1);
- if (name) {
- char *name_dup = strdup(name);
- if (!name_dup) {
- moonbr_log(LOG_CRIT, "Memory allocation_error");
- moonbr_terminate_error();
- }
- listener->type_specific.interval.name = name_dup;
- }
- }
- lua_getfield(L, 3, "delay");
- if (
- !moonbr_lua_totimeval(L, -1, &listener->type_specific.interval.delay) ||
- !timerisset(&listener->type_specific.interval.delay)
- ) {
- luaL_error(L, "No valid interval delay specified; use listen{{proto=\"interval\", delay=...}, ...}");
- }
- lua_getfield(L, 3, "strict");
- if (!lua_isnil(L, -1)) {
- if (lua_isboolean(L, -1)) {
- if (lua_toboolean(L, -1)) listener->type_specific.interval.strict = 1;
- } else {
- luaL_error(L, "Option \"strict\" must be a boolean if set; use listen{{proto=\"interval\", strict=true, ...}, ...}");
- }
- }
- } else if (proto && !strcmp(proto, "local")) {
- const char *path;
- const int path_maxlen = (
- sizeof(listener->type_specific.socket.addr.addr_un) -
- ((void *)listener->type_specific.socket.addr.addr_un.sun_path - (void *)&listener->type_specific.socket.addr.addr_un)
- ) - 1; /* one byte for termination */
- dynamic = 1;
- listener->proto = MOONBR_PROTO_LOCAL;
- lua_getfield(L, 3, "path");
- path = lua_tostring(L, -1);
- if (!path) {
- luaL_error(L, "No valid path specified for local socket; use listen{{proto=\"local\", path=...}, ...}");
- }
- if (strlen(path) > path_maxlen) {
- luaL_error(L, "Path name for local socket exceeded maximum length of %i characters", path_maxlen);
- }
- strcpy(listener->type_specific.socket.addr.addr_un.sun_path, path);
- } else if (proto && !strcmp(proto, "tcp")) {
- const char *host, *port;
- struct addrinfo hints = { 0, };
- struct addrinfo *res, *addrinfo;
- int errcode;
- const char *ip;
- dynamic = 1;
- lua_getfield(L, 3, "host");
- host = lua_isnil(L, -1) ? "::" : lua_tostring(L, -1);
- if (!host) {
- luaL_error(L, "No host specified; use listen{{proto=\"tcp\", host=...}, ...}");
- }
- lua_getfield(L, 3, "port");
- port = lua_tostring(L, -1);
- if (!port) {
- luaL_error(L, "No port specified; use listen{{proto=\"tcp\", host=...}, ...}");
- }
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_protocol = IPPROTO_TCP;
- hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
- errcode = getaddrinfo(host, port, &hints, &res);
- if (errcode) {
- freeaddrinfo(res);
- if (errcode == EAI_SYSTEM) {
- char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
- strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
- luaL_error(L, "Could not resolve host: %s: %s", gai_strerror(errcode), errmsg);
- } else {
- luaL_error(L, "Could not resolve host: %s", gai_strerror(errcode));
- }
- }
- for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
- if (addrinfo->ai_family == AF_INET6) goto moonbr_listen_init_pool_found;
- }
- for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
- if (addrinfo->ai_family == AF_INET) goto moonbr_listen_init_pool_found;
- }
- addrinfo = res;
- moonbr_listen_init_pool_found:
- if (addrinfo->ai_addrlen > sizeof(listener->type_specific.socket.addr)) {
- moonbr_log(LOG_CRIT, "Size of ai_addrlen is unexpectedly big (should not happen)");
- moonbr_terminate_error();
- }
- memcpy(&listener->type_specific.socket.addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
- listener->type_specific.socket.addrlen = addrinfo->ai_addrlen;
- switch (addrinfo->ai_family) {
- case AF_INET6:
- ip = inet_ntop(
- addrinfo->ai_family,
- &((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_addr,
- listener->proto_specific.tcp.ip,
- INET6_ADDRSTRLEN
- );
- if (!ip) {
- moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
- moonbr_terminate_error();
- }
- listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_port);
- break;
- case AF_INET:
- ip = inet_ntop(
- addrinfo->ai_family,
- &((struct sockaddr_in *)addrinfo->ai_addr)->sin_addr,
- listener->proto_specific.tcp.ip,
- INET6_ADDRSTRLEN
- );
- if (!ip) {
- moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
- moonbr_terminate_error();
- }
- listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in *)addrinfo->ai_addr)->sin_port);
- break;
- default:
- strcpy(listener->proto_specific.tcp.ip, "unknown");
- listener->proto_specific.tcp.port = 0;
- }
- listener->proto = MOONBR_PROTO_TCP;
- } else if (proto) {
- luaL_error(L, "Unknown protocol \"%s\"", proto);
- } else {
- luaL_error(L, "No valid protocol specified; use listen{{proto=..., ...}, ...}");
- }
- }
- lua_settop(L, 2);
- if (dynamic) {
- moonbr_listen_init_pool_forkoption("pre_fork", pre_fork, 1);
- moonbr_listen_init_pool_forkoption("min_fork", min_fork, pool->pre_fork > 2 ? pool->pre_fork : 2);
- moonbr_listen_init_pool_forkoption("max_fork", max_fork, pool->min_fork > 16 ? pool->min_fork : 16);
- if (!moonbr_listen_init_pool_timeoption("fork_delay", fork_delay, 0, 250000)) {
- luaL_error(L, "Option \"fork_delay\" is expected to be a non-negative number");
- }
- if (!moonbr_listen_init_pool_timeoption("fork_error_delay", fork_error_delay, 2, 0)) {
- luaL_error(L, "Option \"fork_error_delay\" is expected to be a non-negative number");
- }
- if (!moonbr_listen_init_pool_timeoption("exit_delay", exit_delay, 60, 0)) {
- luaL_error(L, "Option \"exit_delay\" is expected to be a non-negative number");
- }
- if (timercmp(&pool->fork_error_delay, &pool->fork_delay, <)) {
- pool->fork_error_delay = pool->fork_delay;
- }
- if (!moonbr_listen_init_pool_timeoption("idle_timeout", idle_timeout, 0, 0)) {
- luaL_error(L, "Option \"idle_timeout\" is expected to be a non-negative number");
- }
- } else {
- pool->pre_fork = 0;
- pool->min_fork = pool->listener_count;
- pool->max_fork = pool->listener_count;
- }
- lua_getfield(L, 2, "memory_limit");
- if (!lua_isnil(L, -1)) {
- int isnum;
- lua_Number n;
- n = lua_tonumberx(L, -1, &isnum);
- if (n < 0 || !isnum) {
- luaL_error(L, "Option \"memory_limit\" is expected to be a non-negative number");
- }
- pool->memory_limit = n;
- }
- lua_settop(L, 2);
- lua_getfield(L, 2, "prepare");
- if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
- luaL_error(L, "Option \"prepare\" must be nil or a function");
- }
- lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
- lua_getfield(L, 2, "connect");
- if (!lua_isfunction(L, -1)) {
- luaL_error(L, "Option \"connect\" must be a function; use listen{{...}, {...}, connect=function(socket) ... end, ...}");
- }
- lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
- lua_getfield(L, 2, "finish");
- if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
- luaL_error(L, "Option \"finish\" must be nil or a function");
- }
- lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
- return 0;
- }
- static int moonbr_listen(lua_State *L) {
- struct moonbr_pool *pool;
- lua_Integer listener_count;
- if (moonbr_booted) luaL_error(L, "Moonbridge bootup is already complete");
- luaL_checktype(L, 1, LUA_TTABLE);
- listener_count = luaL_len(L, 1);
- if (!listener_count) luaL_error(L, "No listen ports specified; use listen{{proto=..., port=...},...}");
- if (listener_count > 100) luaL_error(L, "Too many listeners");
- pool = moonbr_create_pool(listener_count);
- lua_pushcfunction(L, moonbr_listen_init_pool);
- lua_pushlightuserdata(L, pool);
- lua_pushvalue(L, 1);
- if (lua_pcall(L, 2, 0, 0)) goto moonbr_listen_error;
- {
- int i;
- i = moonbr_start_pool(pool);
- if (i >= 0) {
- lua_pushfstring(L, "Could not initialize listener #%d: %s", i+1, strerror(errno));
- moonbr_listen_error:
- moonbr_destroy_pool(pool);
- lua_pushnil(L);
- lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
- lua_pushnil(L);
- lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
- lua_pushnil(L);
- lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
- lua_error(L);
- }
- }
- return 0;
- }
- /*** Function to modify Lua's library path and/or cpath ***/
- #if defined(MOONBR_LUA_PATH) || defined(MOONBR_LUA_CPATH)
- static void moonbr_modify_path(lua_State *L, char *key, char *value) {
- int stackbase;
- stackbase = lua_gettop(L);
- lua_getglobal(L, "package");
- lua_getfield(L, stackbase+1, key);
- {
- const char *current_str;
- size_t current_strlen;
- luaL_Buffer buf;
- current_str = lua_tolstring(L, stackbase+2, ¤t_strlen);
- luaL_buffinit(L, &buf);
- if (current_str) {
- lua_pushvalue(L, stackbase+2);
- luaL_addvalue(&buf);
- if (current_strlen && current_str[current_strlen-1] != ';') {
- luaL_addchar(&buf, ';');
- }
- }
- luaL_addstring(&buf, value);
- luaL_pushresult(&buf);
- }
- lua_setfield(L, stackbase+1, key);
- lua_settop(L, stackbase);
- }
- #endif
- /*** Main function and command line invokation ***/
- static void moonbr_usage(int err, const char *cmd) {
- FILE *out;
- out = err ? stderr : stdout;
- if (!cmd) cmd = "moonbridge";
- fprintf(out, "Get this help message: %s {-h|--help}\n", cmd);
- fprintf(out, "Usage: %s \\\n", cmd);
- fprintf(out, " [-b|--background] \\\n");
- fprintf(out, " [-d|--debug] \\\n");
- fprintf(out, " [-f|--logfacility {DAEMON|USER|0|1|...|7}] \\\n");
- fprintf(out, " [-i|--logident <syslog ident> \\\n");
- fprintf(out, " [-l|--logfile <logfile>] \\\n");
- fprintf(out, " [-p|--pidfile <pidfile>] \\\n");
- fprintf(out, " [-s|--stats] \\\n");
- fprintf(out, " -- <Lua script> [<cmdline options for Lua script>]\n");
- exit(err);
- }
- #define moonbr_usage_error() moonbr_usage(MOONBR_EXITCODE_CMDLINEERROR, argc ? argv[0] : NULL)
- int main(int argc, char **argv) {
- {
- int daemonize = 0;
- int log_facility = LOG_USER;
- const char *log_ident = "moonbridge";
- const char *log_filename = NULL;
- const char *pid_filename = NULL;
- int option;
- struct option longopts[] = {
- { "background", no_argument, NULL, 'b' },
- { "debug", no_argument, NULL, 'd' },
- { "logfacility", required_argument, NULL, 'f' },
- { "help", no_argument, NULL, 'h' },
- { "logident", required_argument, NULL, 'i' },
- { "logfile", required_argument, NULL, 'l' },
- { "pidfile", required_argument, NULL, 'p' },
- { "stats", no_argument, NULL, 's' }
- };
- while ((option = getopt_long(argc, argv, "bdf:hi:l:p:s", longopts, NULL)) != -1) {
- switch (option) {
- case 'b':
- daemonize = 1;
- break;
- case 'd':
- moonbr_debug = 1;
- moonbr_stat = 1;
- break;
- case 'f':
- if (!strcmp(optarg, "DAEMON")) {
- log_facility = LOG_DAEMON;
- } else if (!strcmp(optarg, "USER")) {
- log_facility = LOG_USER;
- } else if (!strcmp(optarg, "0")) {
- log_facility = LOG_LOCAL0;
- } else if (!strcmp(optarg, "1")) {
- log_facility = LOG_LOCAL1;
- } else if (!strcmp(optarg, "2")) {
- log_facility = LOG_LOCAL2;
- } else if (!strcmp(optarg, "3")) {
- log_facility = LOG_LOCAL3;
- } else if (!strcmp(optarg, "4")) {
- log_facility = LOG_LOCAL4;
- } else if (!strcmp(optarg, "5")) {
- log_facility = LOG_LOCAL5;
- } else if (!strcmp(optarg, "6")) {
- log_facility = LOG_LOCAL6;
- } else if (!strcmp(optarg, "7")) {
- log_facility = LOG_LOCAL7;
- } else {
- moonbr_usage_error();
- }
- moonbr_use_syslog = 1;
- break;
- case 'h':
- moonbr_usage(MOONBR_EXITCODE_GRACEFUL, argv[0]);
- break;
- case 'i':
- log_ident = optarg;
- moonbr_use_syslog = 1;
- break;
- case 'l':
- log_filename = optarg;
- break;
- case 'p':
- pid_filename = optarg;
- break;
- case 's':
- moonbr_stat = 1;
- break;
- default:
- moonbr_usage_error();
- }
- }
- if (argc - optind < 1) moonbr_usage_error();
- if (pid_filename) {
- pid_t otherpid;
- while ((moonbr_pidfh = pidfile_open(pid_filename, 0644, &otherpid)) == NULL) {
- if (errno == EEXIST) {
- if (otherpid == -1) {
- fprintf(stderr, "PID file \"%s\" is already locked\n", pid_filename);
- } else {
- fprintf(stderr, "PID file \"%s\" is already locked by process with PID: %i\n", pid_filename, (int)otherpid);
- }
- exit(MOONBR_EXITCODE_ALREADYRUNNING);
- } else if (errno != EINTR) {
- fprintf(stderr, "Could not write PID file \"%s\": %s\n", pid_filename, strerror(errno));
- exit(MOONBR_EXITCODE_STARTUPERROR);
- }
- }
- }
- if (log_filename) {
- int logfd;
- while (
- ( logfd = flopen(
- log_filename,
- O_WRONLY|O_NONBLOCK|O_CREAT|O_APPEND|O_CLOEXEC,
- 0640
- )
- ) < 0
- ) {
- if (errno == EWOULDBLOCK) {
- fprintf(stderr, "Logfile \"%s\" is locked\n", log_filename);
- exit(MOONBR_EXITCODE_ALREADYRUNNING);
- } else if (errno != EINTR) {
- fprintf(stderr, "Could not open logfile \"%s\": %s\n", log_filename, strerror(errno));
- exit(MOONBR_EXITCODE_STARTUPERROR);
- }
- }
- moonbr_logfile = fdopen(logfd, "a");
- if (!moonbr_logfile) {
- fprintf(stderr, "Could not open write stream to logfile \"%s\": %s\n", log_filename, strerror(errno));
- exit(MOONBR_EXITCODE_STARTUPERROR);
- }
- }
- if (daemonize == 0 && !moonbr_logfile) moonbr_logfile = stderr;
- if (moonbr_logfile) setlinebuf(moonbr_logfile);
- else moonbr_use_syslog = 1;
- if (moonbr_use_syslog) openlog(log_ident, LOG_NDELAY | LOG_PID, log_facility);
- if (daemonize) {
- if (daemon(1, 0)) {
- moonbr_log(LOG_ERR, "Could not daemonize moonbridge process");
- moonbr_terminate_error();
- }
- }
- }
- moonbr_log(LOG_NOTICE, "Starting moonbridge server");
- if (moonbr_pidfh && pidfile_write(moonbr_pidfh)) {
- moonbr_log(LOG_ERR, "Could not write pidfile (after locking)");
- }
- {
- lua_State *L;
- L = lua_newstate(moonbr_alloc, NULL);
- if (!L) {
- moonbr_log(LOG_CRIT, "Could not initialize Lua state");
- moonbr_terminate_error();
- }
- lua_atpanic(L, moonbr_lua_panic);
- lua_pushliteral(L, MOONBR_VERSION_STRING);
- lua_setglobal(L, "_MOONBRIDGE_VERSION");
- luaL_openlibs(L);
- luaL_requiref(L, "moonbridge_io", luaopen_moonbridge_io, 1);
- lua_pop(L, 1);
- #ifdef MOONBR_LUA_PATH
- moonbr_modify_path(L, "path", MOONBR_LUA_PATH);
- #endif
- #ifdef MOONBR_LUA_CPATH
- moonbr_modify_path(L, "cpath", MOONBR_LUA_CPATH);
- #endif
- lua_pushcfunction(L, moonbr_timeout);
- lua_setglobal(L, "timeout");
- lua_pushcfunction(L, moonbr_listen);
- lua_setglobal(L, "listen");
- lua_pushcfunction(L, moonbr_addtraceback); /* on stack position 1 */
- moonbr_log(LOG_INFO, "Loading \"%s\"", argv[optind]);
- if (luaL_loadfile(L, argv[optind])) {
- moonbr_log(LOG_ERR, "Error while loading \"%s\": %s", argv[optind], lua_tostring(L, -1));
- moonbr_terminate_error();
- }
- { int i; for (i=optind+1; i<argc; i++) lua_pushstring(L, argv[i]); }
- if (lua_pcall(L, argc-(optind+1), 0, 1)) {
- moonbr_log(LOG_ERR, "Error while executing \"%s\": %s", argv[optind], lua_tostring(L, -1));
- moonbr_terminate_error();
- }
- if (!moonbr_first_pool) {
- moonbr_log(LOG_WARNING, "No listener initialized.");
- moonbr_terminate_error();
- }
- lua_getglobal(L, "listen");
- lua_pushcfunction(L, moonbr_listen);
- if (lua_compare(L, -2, -1, LUA_OPEQ)) {
- lua_pushnil(L);
- lua_setglobal(L, "listen");
- }
- lua_settop(L, 1);
- lua_gc(L, LUA_GCCOLLECT, 0); /* collect garbage before forking later */
- moonbr_run(L);
- }
- return 0;
- }