1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* 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 <stdio.h>
#include <errno.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "opal/util/few.h"
#include "opal/util/basename.h"
#include "opal/util/argv.h"
#include "opal/constants.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
}
|
