2 * Copyright 1997 Sean Eric Fagan
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Sean Eric Fagan
15 * 4. Neither the name of the author may be used to endorse or promote
16 * products derived from this software without specific prior written
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 * The main module for truss. Surprisingly simple, but, then, the other
37 * files handle the bulk of the work. And, of course, the kernel has to
38 * do a lot of the work :).
41 #include <sys/ptrace.h>
57 fprintf(stderr, "%s\n%s\n",
58 "usage: truss [-cfaedDS] [-o file] [-s strsize] -p pid",
59 " truss [-cfaedDS] [-o file] [-s strsize] command [args]");
68 if (sig > 0 && sig < NSIG) {
69 snprintf(tmp, sizeof(tmp), "SIG%s", sys_signame[sig]);
76 main(int ac, char **av)
79 struct trussinfo *trussinfo;
87 /* Initialize the trussinfo struct */
88 trussinfo = (struct trussinfo *)calloc(1, sizeof(struct trussinfo));
89 if (trussinfo == NULL)
90 errx(1, "calloc() failed");
93 trussinfo->outfile = stderr;
94 trussinfo->strsize = 32;
95 trussinfo->curthread = NULL;
96 LIST_INIT(&trussinfo->proclist);
98 while ((c = getopt(ac, av, "p:o:facedDs:S")) != -1) {
100 case 'p': /* specified pid */
102 /* make sure i don't trace me */
103 if (pid == getpid()) {
104 errx(2, "attempt to grab self.");
107 case 'f': /* Follow fork()'s */
108 trussinfo->flags |= FOLLOWFORKS;
110 case 'a': /* Print execve() argument strings. */
111 trussinfo->flags |= EXECVEARGS;
113 case 'c': /* Count number of system calls and time. */
114 trussinfo->flags |= (COUNTONLY | NOSIGS);
116 case 'e': /* Print execve() environment strings. */
117 trussinfo->flags |= EXECVEENVS;
119 case 'd': /* Absolute timestamps */
120 trussinfo->flags |= ABSOLUTETIMESTAMPS;
122 case 'D': /* Relative timestamps */
123 trussinfo->flags |= RELATIVETIMESTAMPS;
125 case 'o': /* Specified output file */
128 case 's': /* Specified string size */
129 trussinfo->strsize = atoi(optarg);
131 case 'S': /* Don't trace signals */
132 trussinfo->flags |= NOSIGS;
139 ac -= optind; av += optind;
140 if ((pid == 0 && ac == 0) ||
141 (pid != 0 && ac != 0))
144 if (fname != NULL) { /* Use output file */
146 * Set close-on-exec ('e'), so that the output file is not
147 * shared with the traced process.
149 if ((trussinfo->outfile = fopen(fname, "we")) == NULL)
150 err(1, "cannot open %s", fname);
154 * If truss starts the process itself, it will ignore some signals --
155 * they should be passed off to the process, which may or may not
156 * exit. If, however, we are examining an already-running process,
157 * then we restore the event mask on these same signals.
160 /* Start a command ourselves */
162 setup_and_wait(trussinfo, command);
163 signal(SIGINT, SIG_IGN);
164 signal(SIGTERM, SIG_IGN);
165 signal(SIGQUIT, SIG_IGN);
167 sa.sa_handler = restore_proc;
169 sigemptyset(&sa.sa_mask);
170 sigaction(SIGINT, &sa, NULL);
171 sigaction(SIGQUIT, &sa, NULL);
172 sigaction(SIGTERM, &sa, NULL);
173 start_tracing(trussinfo, pid);
177 * At this point, if we started the process, it is stopped waiting to
178 * be woken up, either in exit() or in execve().
180 if (LIST_FIRST(&trussinfo->proclist)->abi == NULL) {
182 * If we are not able to handle this ABI, detach from the
183 * process and exit. If we just created a new process to
184 * run a command, kill the new process rather than letting
188 kill(LIST_FIRST(&trussinfo->proclist)->pid, SIGKILL);
189 ptrace(PT_DETACH, LIST_FIRST(&trussinfo->proclist)->pid, NULL,
193 ptrace(PT_SYSCALL, LIST_FIRST(&trussinfo->proclist)->pid, (caddr_t)1,
197 * At this point, it's a simple loop, waiting for the process to
198 * stop, finding out why, printing out why, and then continuing it.
199 * All of the grunt work is done in the support routines.
201 clock_gettime(CLOCK_REALTIME, &trussinfo->start_time);
203 eventloop(trussinfo);
205 if (trussinfo->flags & COUNTONLY)
206 print_summary(trussinfo);
208 fflush(trussinfo->outfile);