1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23
24/*
25 * trace systems calls if possible
26 */
27
28#include <ast.h>
29#include <error.h>
30#include <proc.h>
31#include <debug.h>
32
33void
34systrace(const char* id)
35{
36	register int	n;
37	register char*	out;
38	char*		s;
39	char		buf[PATH_MAX];
40	char*		av[7];
41	long		ov[2];
42
43	static char*	trace[] = { "trace", "truss", "strace", "traces" };
44
45	if (!(s = getenv("HOME")))
46		return;
47	if (!id && !(id = (const char*)error_info.id))
48		id = (const char*)trace[0];
49	out = buf;
50	out += sfsprintf(out, sizeof(buf), "%s/.%s/%s", s, trace[0], id);
51	if (access(buf, F_OK))
52		return;
53	av[1] = trace[0];
54	av[2] = "-o";
55	av[3] = buf;
56	av[4] = "-p";
57	av[5] = out + 1;
58	av[6] = 0;
59	ov[0] = PROC_FD_DUP(open("/dev/null", O_WRONLY), 2, PROC_FD_PARENT|PROC_FD_CHILD);
60	ov[1] = 0;
61	sfsprintf(out, &buf[sizeof(buf)] - out, ".%d", getpid());
62	for (n = 0; n < elementsof(trace); n++)
63		if (!procfree(procopen(trace[n], av + 1, NiL, ov, PROC_ARGMOD|PROC_GID|PROC_UID|(n == (elementsof(trace) - 1) ? PROC_CLEANUP : 0))))
64		{
65			sleep(1);
66			break;
67		}
68}
69