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/*****************************************************************************
* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
* Written by Jim Garlick <garlick@llnl.gov> LLNL-CODE-423279
* All Rights Reserved.
*
* This file is part of the Distributed I/O Daemon (diod).
* For details, see <http://code.google.com/p/diod/>.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License (as published by the
* Free Software Foundation) version 2, dated June 1991.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the terms and conditions of the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA or see
* <http://www.gnu.org/licenses/>.
*****************************************************************************/
/* conjoin.c - start processes joined by socketpair on fd 0 */
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <libgen.h>
#include <stdarg.h>
#include "diod_log.h"
#ifndef PATH_MAX
#define PATH_MAX 1024
#endif
static void
usage (void)
{
fprintf (stderr, "Usage: conjoin srv-cmd tst-cmd\n");
exit (1);
}
static char *
_cmd (char *cmdline)
{
static char fqcmd[PATH_MAX];
char *p;
snprintf (fqcmd, sizeof (fqcmd), "%s", cmdline);
if ((p = strchr (fqcmd, ' ')))
*p = '\0';
return basename (fqcmd);
}
static void
_interpret_status (int s, char *cmd)
{
if (WIFEXITED (s))
msg ("%s exited with rc=%d", cmd, WEXITSTATUS (s));
else if (WIFSIGNALED (s))
msg ("%s killed with signal %d%s", cmd, WTERMSIG (s),
WCOREDUMP (s) ? " (core dumped)" : "");
else if (WIFSTOPPED (s))
msg ("%s stopped with signal %d", cmd, WSTOPSIG (s));
else if (WIFCONTINUED (s))
msg ("%s restarted with SIGCONT", cmd);
}
int
main (int argc, char *argv[])
{
int cs = -1, s[2];
char *cmd1, *cmd2;
pid_t pid;
if (argc != 3)
usage ();
cmd1 = argv[1];
cmd2 = argv[2];
diod_log_init (argv[0]);
if (socketpair (AF_LOCAL, SOCK_STREAM, 0, s) < 0)
err_exit ("socketpair");
switch ((pid = fork ())) {
case -1:
err_exit ("fork");
/*NOTREACHED*/
case 0: /* child - tst-cmd */
close (s[0]);
if (dup2 (s[1], 0) < 0)
err_exit ("dup2 for %s leg", _cmd (cmd2));
close (s[1]);
if ((cs = system (cmd2)) == -1)
err_exit ("fork for %s leg", _cmd (cmd2));
_interpret_status (cs, _cmd (cmd2));
exit (0);
/*NOTREACHED*/
default: /* parent - srv-cmd */
close (s[1]);
if (dup2 (s[0], 0) < 0) {
err ("dup2 for %s leg", _cmd (cmd1));
break;
}
close (s[0]);
if ((cs = system (cmd1)) == -1)
err ("fork for %s leg", _cmd (cmd1));
close (0);
break;
}
/* reap child */
close (0);
if (waitpid (pid, NULL, 0) < 0)
err_exit ("waitpid");
/* report status of parent now that child has reported */
if (cs != -1)
_interpret_status (cs, _cmd (cmd1));
exit (0);
}
/*
* vi:tabstop=4 shiftwidth=4 expandtab
*/
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