/procfs/main.c
C | 190 lines | 145 code | 24 blank | 21 comment | 23 complexity | 20e5d96cf19e78c4ac013dbe1ed03d02 MD5 | raw file
- /* Hurd /proc filesystem, main program.
- Copyright (C) 2010 Free Software Foundation, Inc.
- This file is part of the GNU Hurd.
- The GNU Hurd is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2, or (at
- your option) any later version.
- The GNU Hurd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
- #include <mach.h>
- #include <hurd.h>
- #include <unistd.h>
- #include <error.h>
- #include <argp.h>
- #include <hurd/netfs.h>
- #include <ps.h>
- #include "procfs.h"
- #include "proclist.h"
- #include "rootdir.h"
- #include "dircat.h"
- #include "main.h"
- /* Command-line options */
- int opt_clk_tck;
- mode_t opt_stat_mode;
- pid_t opt_fake_self;
- pid_t opt_kernel_pid;
- uid_t opt_anon_owner;
- static error_t
- argp_parser (int key, char *arg, struct argp_state *state)
- {
- struct passwd *pw;
- char *endp;
- switch (key)
- {
- case 'h':
- opt_clk_tck = strtol (arg, &endp, 0);
- if (*endp || ! *arg || opt_clk_tck <= 0)
- error (1, 0, "--clk-tck: HZ should be a positive integer");
- break;
- case 's':
- opt_stat_mode = strtol (arg, &endp, 8);
- if (*endp || ! *arg || opt_stat_mode & ~07777)
- error (1, 0, "--stat-mode: MODE should be an octal mode");
- break;
- case 'S':
- if (arg)
- {
- opt_fake_self = strtol (arg, &endp, 0);
- if (*endp || ! *arg)
- error (1, 0, "--fake-self: PID must be an integer");
- }
- else
- opt_fake_self = 1;
- break;
- case 'k':
- opt_kernel_pid = strtol (arg, &endp, 0);
- if (*endp || ! *arg || (signed) opt_kernel_pid < 0)
- error (1, 0, "--kernel-process: PID must be a positive integer");
- break;
- case 'c':
- opt_clk_tck = 100;
- opt_stat_mode = 0444;
- opt_fake_self = 1;
- break;
- case 'a':
- pw = getpwnam (arg);
- if (pw)
- {
- opt_anon_owner = pw->pw_uid;
- break;
- }
- opt_anon_owner = strtol (arg, &endp, 0);
- if (*endp || ! *arg || (signed) opt_anon_owner < 0)
- error(1, 0, "--anonymous-owner: USER should be the a user name "
- "or a numeric UID.");
- break;
- }
- return 0;
- }
- struct argp argp = {
- .options = (struct argp_option []) {
- { "clk-tck", 'h', "HZ", 0,
- "Unit used for the values expressed in system clock ticks "
- "(default: sysconf(_SC_CLK_TCK))" },
- { "stat-mode", 's', "MODE", 0,
- "The [pid]/stat file publishes information which on Hurd is only "
- "available to the process owner. "
- "You can use this option to override its mode to be more permissive "
- "for compatibility purposes. "
- "(default: 0400)" },
- { "fake-self", 'S', "PID", OPTION_ARG_OPTIONAL,
- "Provide a fake \"self\" symlink to the given PID, for compatibility "
- "purposes. If PID is omitted, \"self\" will point to init. "
- "(default: no self link)" },
- { "kernel-process", 'k', "PID", 0,
- "Process identifier for the kernel, used to retreive its command "
- "line, as well as the global up and idle times. "
- "(default: 2)" },
- { "compatible", 'c', NULL, 0,
- "Try to be compatible with the Linux procps utilities. "
- "Currently equivalent to -h 100 -s 0444 -S 1." },
- { "anonymous-owner", 'a', "USER", 0,
- "Make USER the owner of files related to processes without one. "
- "Be aware that USER will be granted access to the environment and "
- "other sensitive information about the processes in question. "
- "(default: use uid 0)" },
- {}
- },
- .parser = argp_parser,
- .doc = "A virtual filesystem emulating the Linux procfs.",
- .children = (struct argp_child []) {
- { &netfs_std_startup_argp, },
- {}
- },
- };
- error_t
- root_make_node (struct ps_context *pc, struct node **np)
- {
- struct node *root_dirs[] = {
- proclist_make_node (pc),
- rootdir_make_node (pc),
- };
- *np = dircat_make_node (root_dirs, sizeof root_dirs / sizeof root_dirs[0]);
- if (! *np)
- return ENOMEM;
- /* Since this one is not created through proc_lookup(), we have to affect an
- inode number to it. */
- (*np)->nn_stat.st_ino = * (uint32_t *) "PROC";
- return 0;
- }
- int main (int argc, char **argv)
- {
- struct ps_context *pc;
- mach_port_t bootstrap;
- error_t err;
- opt_clk_tck = sysconf(_SC_CLK_TCK);
- opt_stat_mode = 0400;
- opt_fake_self = -1;
- opt_kernel_pid = 2;
- opt_anon_owner = 0;
- err = argp_parse (&argp, argc, argv, 0, 0, 0);
- if (err)
- error (1, err, "Could not parse command line");
- err = ps_context_create (getproc (), &pc);
- if (err)
- error (1, err, "Could not create libps context");
- task_get_bootstrap_port (mach_task_self (), &bootstrap);
- if (bootstrap == MACH_PORT_NULL)
- error (1, 0, "Must be started as a translator");
- netfs_init ();
- err = root_make_node (pc, &netfs_root_node);
- if (err)
- error (1, err, "Could not create the root node");
- netfs_startup (bootstrap, 0);
- netfs_server_loop ();
- assert (0 /* netfs_server_loop returned after all */);
- }