This repository has been archived by the owner on Jan 12, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathsystem_return.c
85 lines (75 loc) · 2.29 KB
/
system_return.c
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
84
/**
* The MIT License (MIT)
*
* Copyright (C) 2017, djcj <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
/**
* like system() but it returns the exit code of the
* given command rather than that of the forked shell
*/
int system_return(const char *command)
{
int status;
int return_status = 127;
pid_t pid = fork();
if (pid == 0)
{
execl("/bin/sh", "sh", "-c", command, (char *)NULL);
_exit(127); /* if execl() was successful, this won't be reached */
}
if (pid > 0)
{
if (waitpid(pid, &status, 0) > 0)
{
if (WIFEXITED(status) == 1)
{
return_status = WEXITSTATUS(status);
if (return_status == 127) {
fprintf(stderr, "execl() failed\n");
}
} else {
fprintf(stderr, "the program did not terminate normally\n");
}
} else {
fprintf(stderr, "waitpid() failed\n");
}
} else {
fprintf(stderr, "failed to fork()\n");
}
return return_status;
}
/*
int main(int argc, char **argv)
{
if (argc != 2)
{
fprintf(stderr, "usage: %s command\n", argv[0]);
return 1;
}
int retval = system_return(argv[1]);
printf("command `%s' returned %d\n", argv[1], retval);
return 0;
}
*/