1*4887Schin /***********************************************************************
2*4887Schin *                                                                      *
3*4887Schin *               This software is part of the ast package               *
4*4887Schin *           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
5*4887Schin *                      and is licensed under the                       *
6*4887Schin *                  Common Public License, Version 1.0                  *
7*4887Schin *                      by AT&T Knowledge Ventures                      *
8*4887Schin *                                                                      *
9*4887Schin *                A copy of the License is available at                 *
10*4887Schin *            http://www.opensource.org/licenses/cpl1.0.txt             *
11*4887Schin *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*4887Schin *                                                                      *
13*4887Schin *              Information and Software Systems Research               *
14*4887Schin *                            AT&T Research                             *
15*4887Schin *                           Florham Park NJ                            *
16*4887Schin *                                                                      *
17*4887Schin *                 Glenn Fowler <gsf@research.att.com>                  *
18*4887Schin *                  David Korn <dgk@research.att.com>                   *
19*4887Schin *                   Phong Vo <kpv@research.att.com>                    *
20*4887Schin *                                                                      *
21*4887Schin ***********************************************************************/
22*4887Schin #pragma prototyped
23*4887Schin 
24*4887Schin /*
25*4887Schin  * trace systems calls if possible
26*4887Schin  */
27*4887Schin 
28*4887Schin #include <ast.h>
29*4887Schin #include <error.h>
30*4887Schin #include <proc.h>
31*4887Schin #include <debug.h>
32*4887Schin 
33*4887Schin void
34*4887Schin systrace(const char* id)
35*4887Schin {
36*4887Schin 	register int	n;
37*4887Schin 	register char*	out;
38*4887Schin 	char*		s;
39*4887Schin 	char		buf[PATH_MAX];
40*4887Schin 	char*		av[7];
41*4887Schin 	long		ov[2];
42*4887Schin 
43*4887Schin 	static char*	trace[] = { "trace", "truss", "strace", "traces" };
44*4887Schin 
45*4887Schin 	if (!(s = getenv("HOME")))
46*4887Schin 		return;
47*4887Schin 	if (!id && !(id = (const char*)error_info.id))
48*4887Schin 		id = (const char*)trace[0];
49*4887Schin 	out = buf;
50*4887Schin 	out += sfsprintf(out, sizeof(buf), "%s/.%s/%s", s, trace[0], id);
51*4887Schin 	if (access(buf, F_OK))
52*4887Schin 		return;
53*4887Schin 	av[1] = trace[0];
54*4887Schin 	av[2] = "-o";
55*4887Schin 	av[3] = buf;
56*4887Schin 	av[4] = "-p";
57*4887Schin 	av[5] = out + 1;
58*4887Schin 	av[6] = 0;
59*4887Schin 	ov[0] = PROC_FD_DUP(open("/dev/null", O_WRONLY), 2, PROC_FD_PARENT|PROC_FD_CHILD);
60*4887Schin 	ov[1] = 0;
61*4887Schin 	sfsprintf(out, &buf[sizeof(buf)] - out, ".%d", getpid());
62*4887Schin 	for (n = 0; n < elementsof(trace); n++)
63*4887Schin 		if (!procfree(procopen(trace[n], av + 1, NiL, ov, PROC_ARGMOD|PROC_GID|PROC_UID|(n == (elementsof(trace) - 1) ? PROC_CLEANUP : 0))))
64*4887Schin 		{
65*4887Schin 			sleep(1);
66*4887Schin 			break;
67*4887Schin 		}
68*4887Schin }
69