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systrace.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * trace systems calls if possible
 */

#include <ast.h>
#include <error.h>
#include <proc.h>
#include <debug.h>

void
systrace(const char* id)
{
      register int      n;
      register char*    out;
      char*       s;
      char        buf[PATH_MAX];
      char*       av[7];
      long        ov[2];

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

      if (!(s = getenv("HOME")))
            return;
      if (!id && !(id = (const char*)error_info.id))
            id = (const char*)trace[0];
      out = buf;
      out += sfsprintf(out, sizeof(buf), "%s/.%s/%s", s, trace[0], id);
      if (access(buf, F_OK))
            return;
      av[1] = trace[0];
      av[2] = "-o";
      av[3] = buf;
      av[4] = "-p";
      av[5] = out + 1;
      av[6] = 0;
      ov[0] = PROC_FD_DUP(open("/dev/null", O_WRONLY), 2, PROC_FD_PARENT|PROC_FD_CHILD);
      ov[1] = 0;
      sfsprintf(out, &buf[sizeof(buf)] - out, ".%d", getpid());
      for (n = 0; n < elementsof(trace); n++)
            if (!procfree(procopen(trace[n], av + 1, NiL, ov, PROC_ARGMOD|PROC_GID|PROC_UID|(n == (elementsof(trace) - 1) ? PROC_CLEANUP : 0))))
            {
                  sleep(1);
                  break;
            }
}

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