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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include <errno.h>
#include <stdio.h>
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "opal/constants.h"
#include "opal/util/few.h"
int opal_few(char *argv[], int *status)
{
#if defined(HAVE_FORK) && defined(HAVE_EXECVE) && defined(HAVE_WAITPID)
pid_t pid, ret;
if ((pid = fork()) < 0) {
return OPAL_ERR_IN_ERRNO;
}
/* Child execs. If it fails to exec, exit. */
else if (0 == pid) {
execvp(argv[0], argv);
exit(errno);
}
/* Parent loops waiting for the child to die. */
else {
do {
/* If the child exited, return */
if (pid == (ret = waitpid(pid, status, 0))) {
break;
}
/* If waitpid was interrupted, loop around again */
else if (ret < 0) {
if (EINTR == errno) {
continue;
}
/* Otherwise, some bad juju happened -- need to quit */
return OPAL_ERR_IN_ERRNO;
}
} while (true);
}
/* Return the status to the caller */
return OPAL_SUCCESS;
#else
return OPAL_ERR_NOT_SUPPORTED;
#endif
}
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