1da2e3ebchin/***********************************************************************
2da2e3ebchin*                                                                      *
3da2e3ebchin*               This software is part of the ast package               *
43e14f97Roger A. Faulkner*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5da2e3ebchin*                      and is licensed under the                       *
6da2e3ebchin*                  Common Public License, Version 1.0                  *
77c2fbfbApril Chin*                    by AT&T Intellectual Property                     *
8da2e3ebchin*                                                                      *
9da2e3ebchin*                A copy of the License is available at                 *
10da2e3ebchin*            http://www.opensource.org/licenses/cpl1.0.txt             *
11da2e3ebchin*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12da2e3ebchin*                                                                      *
13da2e3ebchin*              Information and Software Systems Research               *
14da2e3ebchin*                            AT&T Research                             *
15da2e3ebchin*                           Florham Park NJ                            *
16da2e3ebchin*                                                                      *
17da2e3ebchin*                 Glenn Fowler <gsf@research.att.com>                  *
18da2e3ebchin*                  David Korn <dgk@research.att.com>                   *
19da2e3ebchin*                   Phong Vo <kpv@research.att.com>                    *
20da2e3ebchin*                                                                      *
21da2e3ebchin***********************************************************************/
22da2e3ebchin#pragma prototyped
23da2e3ebchin
24da2e3ebchin/*
25da2e3ebchin * trace systems calls if possible
26da2e3ebchin */
27da2e3ebchin
28da2e3ebchin#include <ast.h>
29da2e3ebchin#include <error.h>
30da2e3ebchin#include <proc.h>
31da2e3ebchin#include <debug.h>
32da2e3ebchin
33da2e3ebchinvoid
34da2e3ebchinsystrace(const char* id)
35da2e3ebchin{
36da2e3ebchin	register int	n;
37da2e3ebchin	register char*	out;
38da2e3ebchin	char*		s;
39da2e3ebchin	char		buf[PATH_MAX];
40da2e3ebchin	char*		av[7];
41da2e3ebchin	long		ov[2];
42da2e3ebchin
43da2e3ebchin	static char*	trace[] = { "trace", "truss", "strace", "traces" };
44da2e3ebchin
45da2e3ebchin	if (!(s = getenv("HOME")))
46da2e3ebchin		return;
47da2e3ebchin	if (!id && !(id = (const char*)error_info.id))
48da2e3ebchin		id = (const char*)trace[0];
49da2e3ebchin	out = buf;
50da2e3ebchin	out += sfsprintf(out, sizeof(buf), "%s/.%s/%s", s, trace[0], id);
51da2e3ebchin	if (access(buf, F_OK))
52da2e3ebchin		return;
53da2e3ebchin	av[1] = trace[0];
54da2e3ebchin	av[2] = "-o";
55da2e3ebchin	av[3] = buf;
56da2e3ebchin	av[4] = "-p";
57da2e3ebchin	av[5] = out + 1;
58da2e3ebchin	av[6] = 0;
59da2e3ebchin	ov[0] = PROC_FD_DUP(open("/dev/null", O_WRONLY), 2, PROC_FD_PARENT|PROC_FD_CHILD);
60da2e3ebchin	ov[1] = 0;
61da2e3ebchin	sfsprintf(out, &buf[sizeof(buf)] - out, ".%d", getpid());
62da2e3ebchin	for (n = 0; n < elementsof(trace); n++)
63da2e3ebchin		if (!procfree(procopen(trace[n], av + 1, NiL, ov, PROC_ARGMOD|PROC_GID|PROC_UID|(n == (elementsof(trace) - 1) ? PROC_CLEANUP : 0))))
64da2e3ebchin		{
65da2e3ebchin			sleep(1);
66da2e3ebchin			break;
67da2e3ebchin		}
68da2e3ebchin}
69