2 * Copryight 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. Suprisingly 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/param.h>
42 #include <sys/types.h>
44 #include <sys/resource.h>
45 #include <sys/sysctl.h>
66 fprintf(stderr, "%s\n%s\n",
67 "usage: truss [-faedDS] [-o file] [-s strsize] -p pid",
68 " truss [-faedDS] [-o file] [-s strsize] command [args]");
73 * WARNING! "FreeBSD a.out" must be first, or set_etype will not
78 void (*enter_syscall)(struct trussinfo *, int);
79 long (*exit_syscall)(struct trussinfo *, int);
82 { "FreeBSD ELF64", amd64_syscall_entry, amd64_syscall_exit },
83 { "FreeBSD ELF32", amd64_fbsd32_syscall_entry, amd64_fbsd32_syscall_exit },
84 { "Linux ELF32", amd64_linux32_syscall_entry, amd64_linux32_syscall_exit },
87 { "FreeBSD a.out", i386_syscall_entry, i386_syscall_exit },
88 { "FreeBSD ELF", i386_syscall_entry, i386_syscall_exit },
89 { "FreeBSD ELF32", i386_syscall_entry, i386_syscall_exit },
90 { "Linux ELF", i386_linux_syscall_entry, i386_linux_syscall_exit },
93 { "FreeBSD ELF64", ia64_syscall_entry, ia64_syscall_exit },
96 { "FreeBSD ELF", powerpc_syscall_entry, powerpc_syscall_exit },
97 { "FreeBSD ELF32", powerpc_syscall_entry, powerpc_syscall_exit },
100 { "FreeBSD ELF64", sparc64_syscall_entry, sparc64_syscall_exit },
106 * Set the execution type. This is called after every exec, and when
107 * a process is first monitored.
110 static struct ex_types *
111 set_etype(struct trussinfo *trussinfo)
113 struct ex_types *funcs;
116 size_t len = sizeof(progt);
122 mib[2] = KERN_PROC_SV_NAME;
123 mib[3] = trussinfo->pid;
124 error = sysctl(mib, 4, progt, &len, NULL, 0);
126 err(2, "can not get etype");
128 for (funcs = ex_types; funcs->type; funcs++)
129 if (!strcmp(funcs->type, progt))
132 if (funcs->type == NULL) {
133 funcs = &ex_types[0];
134 warn("execution type %s is not supported -- using %s",
146 if (sig > 0 && sig < NSIG) {
148 asprintf(&ret, "sig%s", sys_signame[sig]);
151 for (i = 0; ret[i] != '\0'; ++i)
152 ret[i] = toupper(ret[i]);
158 main(int ac, char **av)
163 struct ex_types *funcs;
166 struct trussinfo *trussinfo;
172 /* Initialize the trussinfo struct */
173 trussinfo = (struct trussinfo *)malloc(sizeof(struct trussinfo));
174 if (trussinfo == NULL)
175 errx(1, "malloc() failed");
176 bzero(trussinfo, sizeof(struct trussinfo));
178 trussinfo->outfile = stderr;
179 trussinfo->strsize = 32;
180 trussinfo->pr_why = S_NONE;
181 trussinfo->curthread = NULL;
182 SLIST_INIT(&trussinfo->threadlist);
183 while ((c = getopt(ac, av, "p:o:faedDs:S")) != -1) {
185 case 'p': /* specified pid */
186 trussinfo->pid = atoi(optarg);
187 /* make sure i don't trace me */
188 if(trussinfo->pid == getpid()) {
189 fprintf(stderr, "attempt to grab self.\n");
193 case 'f': /* Follow fork()'s */
194 trussinfo->flags |= FOLLOWFORKS;
196 case 'a': /* Print execve() argument strings. */
197 trussinfo->flags |= EXECVEARGS;
199 case 'e': /* Print execve() environment strings. */
200 trussinfo->flags |= EXECVEENVS;
202 case 'd': /* Absolute timestamps */
203 trussinfo->flags |= ABSOLUTETIMESTAMPS;
205 case 'D': /* Relative timestamps */
206 trussinfo->flags |= RELATIVETIMESTAMPS;
208 case 'o': /* Specified output file */
211 case 's': /* Specified string size */
212 trussinfo->strsize = atoi(optarg);
214 case 'S': /* Don't trace signals */
215 trussinfo->flags |= NOSIGS;
222 ac -= optind; av += optind;
223 if ((trussinfo->pid == 0 && ac == 0) ||
224 (trussinfo->pid != 0 && ac != 0))
227 if (fname != NULL) { /* Use output file */
228 if ((trussinfo->outfile = fopen(fname, "w")) == NULL)
229 errx(1, "cannot open %s", fname);
233 * If truss starts the process itself, it will ignore some signals --
234 * they should be passed off to the process, which may or may not
235 * exit. If, however, we are examining an already-running process,
236 * then we restore the event mask on these same signals.
239 if (trussinfo->pid == 0) { /* Start a command ourselves */
241 trussinfo->pid = setup_and_wait(command);
242 signal(SIGINT, SIG_IGN);
243 signal(SIGTERM, SIG_IGN);
244 signal(SIGQUIT, SIG_IGN);
246 start_tracing(trussinfo->pid);
247 signal(SIGINT, restore_proc);
248 signal(SIGTERM, restore_proc);
249 signal(SIGQUIT, restore_proc);
254 * At this point, if we started the process, it is stopped waiting to
255 * be woken up, either in exit() or in execve().
259 funcs = set_etype(trussinfo);
263 * At this point, it's a simple loop, waiting for the process to
264 * stop, finding out why, printing out why, and then continuing it.
265 * All of the grunt work is done in the support routines.
268 clock_gettime(CLOCK_REALTIME, &trussinfo->start_time);
271 struct timespec timediff;
272 waitevent(trussinfo);
274 switch(i = trussinfo->pr_why) {
276 funcs->enter_syscall(trussinfo, MAXARGS);
277 clock_gettime(CLOCK_REALTIME,
281 clock_gettime(CLOCK_REALTIME,
284 if (trussinfo->curthread->in_fork &&
285 (trussinfo->flags & FOLLOWFORKS)) {
288 trussinfo->curthread->in_fork = 0;
290 funcs->exit_syscall(trussinfo,
294 * Fork a new copy of ourself to trace
295 * the child of the original traced
299 trussinfo->pid = childpid;
300 start_tracing(trussinfo->pid);
305 funcs->exit_syscall(trussinfo, MAXARGS);
308 if (trussinfo->flags & NOSIGS)
310 if (trussinfo->flags & FOLLOWFORKS)
311 fprintf(trussinfo->outfile, "%5d: ",
313 if (trussinfo->flags & ABSOLUTETIMESTAMPS) {
314 timespecsubt(&trussinfo->after,
315 &trussinfo->start_time, &timediff);
316 fprintf(trussinfo->outfile, "%ld.%09ld ",
317 (long)timediff.tv_sec,
320 if (trussinfo->flags & RELATIVETIMESTAMPS) {
321 timespecsubt(&trussinfo->after,
322 &trussinfo->before, &timediff);
323 fprintf(trussinfo->outfile, "%ld.%09ld ",
324 (long)timediff.tv_sec,
327 signame = strsig(trussinfo->pr_data);
328 fprintf(trussinfo->outfile,
329 "SIGNAL %u (%s)\n", trussinfo->pr_data,
330 signame == NULL ? "?" : signame);
334 if (trussinfo->flags & FOLLOWFORKS)
335 fprintf(trussinfo->outfile, "%5d: ",
337 if (trussinfo->flags & ABSOLUTETIMESTAMPS) {
338 timespecsubt(&trussinfo->after,
339 &trussinfo->start_time, &timediff);
340 fprintf(trussinfo->outfile, "%ld.%09ld ",
341 (long)timediff.tv_sec,
344 if (trussinfo->flags & RELATIVETIMESTAMPS) {
345 timespecsubt(&trussinfo->after,
346 &trussinfo->before, &timediff);
347 fprintf(trussinfo->outfile, "%ld.%09ld ",
348 (long)timediff.tv_sec, timediff.tv_nsec);
350 fprintf(trussinfo->outfile,
351 "process exit, rval = %u\n", trussinfo->pr_data);
356 } while (trussinfo->pr_why != S_EXIT);
357 fflush(trussinfo->outfile);