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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/misc/systrace.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * trace systems calls if possible

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 */

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#include <ast.h>

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#include <error.h>

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#include <proc.h>

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#include <debug.h>

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void

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systrace(const char* id)

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{

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	register int	n;

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	register char*	out;

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	char*		s;

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	char		buf[PATH_MAX];

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	char*		av[7];

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	long		ov[2];

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	static char*	trace[] = { "trace", "truss", "strace", "traces" };

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	if (!(s = getenv("HOME")))

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		return;

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	if (!id && !(id = (const char*)error_info.id))

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		id = (const char*)trace[0];

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	out = buf;

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	out += sfsprintf(out, sizeof(buf), "%s/.%s/%s", s, trace[0], id);

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	if (access(buf, F_OK))

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		return;

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	av[1] = trace[0];

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	av[2] = "-o";

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	av[3] = buf;

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	av[4] = "-p";

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	av[5] = out + 1;

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	av[6] = 0;

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	ov[0] = PROC_FD_DUP(open("/dev/null", O_WRONLY), 2, PROC_FD_PARENT|PROC_FD_CHILD);

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	ov[1] = 0;

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	sfsprintf(out, &buf[sizeof(buf)] - out, ".%d", getpid());

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	for (n = 0; n < elementsof(trace); n++)

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		if (!procfree(procopen(trace[n], av + 1, NiL, ov, PROC_ARGMOD|PROC_GID|PROC_UID|(n == (elementsof(trace) - 1) ? PROC_CLEANUP : 0))))

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		{

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			sleep(1);

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			break;

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		}

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}

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