/usr.bin/ktrace/ktrace.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 240 lines · 176 code · 24 blank · 40 comment · 64 complexity · 119494d21d7cab6c589adee777aad120 MD5 · raw file
- /*-
- * Copyright (c) 1988, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef lint
- static const char copyright[] =
- "@(#) Copyright (c) 1988, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
- #if 0
- #ifndef lint
- static char sccsid[] = "@(#)ktrace.c 8.1 (Berkeley) 6/6/93";
- #endif /* not lint */
- #endif
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/param.h>
- #include <sys/file.h>
- #include <sys/stat.h>
- #include <sys/time.h>
- #include <sys/uio.h>
- #include <sys/ktrace.h>
- #include <err.h>
- #include <errno.h>
- #include <inttypes.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include "ktrace.h"
- static char def_tracefile[] = DEF_TRACEFILE;
- static enum clear { NOTSET, CLEAR, CLEARALL } clear = NOTSET;
- static int pid;
- static void no_ktrace(int);
- static void set_pid_clear(const char *, enum clear);
- static void usage(void);
- int
- main(int argc, char *argv[])
- {
- int append, ch, fd, inherit, ops, trpoints;
- const char *tracefile;
- mode_t omask;
- struct stat sb;
- append = ops = inherit = 0;
- trpoints = DEF_POINTS;
- tracefile = def_tracefile;
- while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
- switch((char)ch) {
- case 'a':
- append = 1;
- break;
- case 'C':
- set_pid_clear("1", CLEARALL);
- break;
- case 'c':
- set_pid_clear(NULL, CLEAR);
- break;
- case 'd':
- ops |= KTRFLAG_DESCEND;
- break;
- case 'f':
- tracefile = optarg;
- break;
- case 'g':
- set_pid_clear(optarg, NOTSET);
- pid = -pid;
- break;
- case 'i':
- inherit = 1;
- break;
- case 'p':
- set_pid_clear(optarg, NOTSET);
- break;
- case 't':
- trpoints = getpoints(optarg);
- if (trpoints < 0) {
- warnx("unknown facility in %s", optarg);
- usage();
- }
- break;
- default:
- usage();
- }
- argv += optind;
- argc -= optind;
- /* must have either -[Cc], a pid or a command */
- if (clear == NOTSET && pid == 0 && argc == 0)
- usage();
- /* can't have both a pid and a command */
- /* (note that -C sets pid to 1) */
- if (pid != 0 && argc > 0) {
- usage();
- }
- if (inherit)
- trpoints |= KTRFAC_INHERIT;
- (void)signal(SIGSYS, no_ktrace);
- if (clear != NOTSET) {
- if (clear == CLEARALL) {
- ops = KTROP_CLEAR | KTRFLAG_DESCEND;
- trpoints = ALL_POINTS;
- } else {
- ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
- }
- if (ktrace(tracefile, ops, trpoints, pid) < 0)
- err(1, "%s", tracefile);
- exit(0);
- }
- omask = umask(S_IRWXG|S_IRWXO);
- if (append) {
- if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK,
- DEFFILEMODE)) < 0)
- err(1, "%s", tracefile);
- if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
- errx(1, "refuse to append to %s not owned by you",
- tracefile);
- if (!(S_ISREG(sb.st_mode)))
- errx(1, "%s not regular file", tracefile);
- } else {
- if (unlink(tracefile) == -1 && errno != ENOENT)
- err(1, "unlink %s", tracefile);
- if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
- DEFFILEMODE)) < 0)
- err(1, "%s", tracefile);
- }
- (void)umask(omask);
- (void)close(fd);
- trpoints |= PROC_ABI_POINTS;
- if (argc > 0) {
- if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
- err(1, "%s", tracefile);
- execvp(*argv, argv);
- err(1, "exec of '%s' failed", *argv);
- }
- if (ktrace(tracefile, ops, trpoints, pid) < 0)
- err(1, "%s", tracefile);
- exit(0);
- }
- static void
- set_pid_clear(const char *p, enum clear cl)
- {
- intmax_t n;
- char *e;
- if (clear != NOTSET && cl != NOTSET) {
- /* either -c and -C or either of them twice */
- warnx("only one -c or -C flag is permitted");
- usage();
- }
- if ((clear == CLEARALL && p != NULL) || (cl == CLEARALL && pid != 0)) {
- /* both -C and a pid or pgid */
- warnx("the -C flag may not be combined with -g or -p");
- usage();
- }
- if (p != NULL && pid != 0) {
- /* either -p and -g or either of them twice */
- warnx("only one -g or -p flag is permitted");
- usage();
- }
- if (p != NULL) {
- errno = 0;
- n = strtoimax(p, &e, 10);
- /*
- * 1) not a number, or outside the range of an intmax_t
- * 2) inside the range of intmax_t but outside the range
- * of an int, keeping in mind that the pid may be
- * negated if it's actually a pgid.
- */
- if (*e != '\0' || n < 1 || errno == ERANGE ||
- n > (intmax_t)INT_MAX || n > -(intmax_t)INT_MIN) {
- warnx("invalid process or group id");
- usage();
- }
- pid = n;
- }
- if (cl != NOTSET)
- if ((clear = cl) == CLEARALL)
- pid = 1;
- }
- static void
- usage(void)
- {
- fprintf(stderr, "%s\n%s\n",
- "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]",
- " ktrace [-adi] [-f trfile] [-t trstr] command");
- exit(1);
- }
- static void
- no_ktrace(int sig __unused)
- {
- fprintf(stderr, "error:\t%s\n\t%s\n",
- "ktrace() system call not supported in the running kernel",
- "re-compile kernel with 'options KTRACE'");
- exit(1);
- }