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
31 * $FreeBSD: src/usr.bin/truss/main.c,v 1.15.2.3 2002/05/16 23:41:23 peter Exp $
32 * $DragonFly: src/usr.bin/truss/main.c,v 1.5 2005/05/28 00:22:04 swildner Exp $
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/ioctl.h>
43 #include <sys/pioctl.h>
44 #include <sys/ucred.h>
45 #include <sys/mount.h>
59 * These should really be parameterized -- I don't like having globals,
60 * but this is the easiest way, right now, to deal with them.
71 fprintf(stderr
, "%s\n%s\n",
72 "usage: truss [-S] [-o file] -p pid",
73 " truss [-S] [-o file] command [args]");
78 * WARNING! "FreeBSD a.out" must be first, or set_etype will not
83 void (*enter_syscall
)(int, int);
84 void (*exit_syscall
)(int, int);
87 { "FreeBSD a.out", i386_syscall_entry
, i386_syscall_exit
},
88 { "FreeBSD ELF", i386_syscall_entry
, i386_syscall_exit
},
89 { "Linux ELF", i386_linux_syscall_entry
, i386_linux_syscall_exit
},
95 * Set the execution type. This is called after every exec, and when
96 * a process is first monitored. The procfs pseudo-file "etype" has
97 * the execution module type -- see /proc/curproc/etype for an example.
100 static struct ex_types
*
102 struct ex_types
*funcs
;
107 asprintf(&etype
, "%s/%d/etype", procfs_path
, pid
);
109 err(1, "Out of memory");
110 if ((fd
= open(etype
, O_RDONLY
)) == -1) {
111 strcpy(progt
, "FreeBSD a.out");
113 int len
= read(fd
, progt
, sizeof(progt
));
119 for (funcs
= ex_types
; funcs
->type
; funcs
++)
120 if (!strcmp(funcs
->type
, progt
))
123 if (funcs
->type
== NULL
) {
124 funcs
= &ex_types
[0];
125 warn("Execution type %s is not supported -- using %s\n",
132 main(int ac
, char **av
) {
135 struct procfs_status pfs
;
136 struct ex_types
*funcs
;
137 struct statfs
*mntbuf
;
142 /* Check where procfs is mounted if it is mounted */
143 if ((mntsize
= getmntinfo(&mntbuf
, MNT_NOWAIT
)) == 0)
144 err(1, "getmntinfo");
145 for (i
= 0; i
< mntsize
; i
++) {
146 if (strcasecmp(mntbuf
[i
].f_mntfromname
, "procfs") == 0) {
147 strlcpy(procfs_path
, mntbuf
[i
].f_mntonname
, sizeof(procfs_path
));
154 err(1, "You must have a mounted procfs to use truss");
158 while ((c
= getopt(ac
, av
, "p:o:S")) != -1) {
160 case 'p': /* specified pid */
162 if (pid
== getpid()) {
163 /* make sure truss doesn't trace itself */
164 fprintf(stderr
, "truss: attempt to self trace: %d\n", pid
);
168 case 'o': /* Specified output file */
171 case 'S': /* Don't trace signals */
179 ac
-= optind
; av
+= optind
;
180 if ((pid
== 0 && ac
== 0) || (pid
!= 0 && ac
!= 0))
183 if (fname
!= NULL
) { /* Use output file */
184 if ((outfile
= fopen(fname
, "w")) == NULL
)
185 errx(1, "cannot open %s", fname
);
189 * If truss starts the process itself, it will ignore some signals --
190 * they should be passed off to the process, which may or may not
191 * exit. If, however, we are examining an already-running process,
192 * then we restore the event mask on these same signals.
195 if (pid
== 0) { /* Start a command ourselves */
197 pid
= setup_and_wait(command
);
198 signal(SIGINT
, SIG_IGN
);
199 signal(SIGTERM
, SIG_IGN
);
200 signal(SIGQUIT
, SIG_IGN
);
202 signal(SIGINT
, restore_proc
);
203 signal(SIGTERM
, restore_proc
);
204 signal(SIGQUIT
, restore_proc
);
209 * At this point, if we started the process, it is stopped waiting to
210 * be woken up, either in exit() or in execve().
213 Procfd
= start_tracing(pid
, S_EXEC
| S_SCE
| S_SCX
| S_CORE
| S_EXIT
|
214 (nosigs
? 0 : S_SIG
));
222 * At this point, it's a simple loop, waiting for the process to
223 * stop, finding out why, printing out why, and then continuing it.
224 * All of the grunt work is done in the support routines.
230 if (ioctl(Procfd
, PIOCWAIT
, &pfs
) == -1)
231 warn("PIOCWAIT top of loop");
233 switch(i
= pfs
.why
) {
235 funcs
->enter_syscall(pid
, pfs
.val
);
239 * This is so we don't get two messages for an exec -- one
240 * for the S_EXEC, and one for the syscall exit. It also,
241 * conveniently, ensures that the first message printed out
242 * isn't the return-from-syscall used to create the process.
249 funcs
->exit_syscall(pid
, pfs
.val
);
252 fprintf(outfile
, "SIGNAL %lu\n", pfs
.val
);
256 fprintf (outfile
, "process exit, rval = %lu\n", pfs
.val
);
263 fprintf (outfile
, "Process stopped because of: %d\n", i
);
267 if (ioctl(Procfd
, PIOCCONT
, val
) == -1) {
268 if (kill(pid
, 0) == -1 && errno
== ESRCH
)
273 } while (pfs
.why
!= S_EXIT
);
276 if (sigexit
== SIGQUIT
)
278 (void) signal(sigexit
, SIG_DFL
);
279 (void) kill(getpid(), sigexit
);