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
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/* vi: set sw=4 ts=4: */
/*
* clone test for uClibc
*
* Copyright (C) 2000 by Lineo, inc. and Erik Andersen
* Copyright (C) 2000,2001 by Erik Andersen <andersen@uclibc.org>
* Written by Erik Andersen <andersen@uclibc.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* 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 GNU Library General Public License
* for more details.
*
* You should have received a copy of the GNU Library 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
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sched.h>
#include <sys/wait.h>
#define GOT1 (1 << 1)
#define GOT2 (1 << 2)
#define GOT3 (1 << 3)
#define ALLGOT (GOT1|GOT2|GOT3)
void child_handler(int sig)
{
printf("I got a SIGCHLD\n");
}
int clone_main(void *arg)
{
unsigned long input = (unsigned long)arg;
int secs = (input / 10) * 4;
printf("Clone got %lu, sleeping for %i secs\n", input, secs);
sleep(secs);
return input + 20;
}
int main(void)
{
int clone1, clone2, clone3;
char clone1_stack[8192], clone2_stack[8192], clone3_stack[8192];
int status, nostatus, result, wpid;
signal(SIGCHLD, child_handler);
if ((clone1 = clone(clone_main, clone1_stack, 0, (void*)11)) == -1) {
perror("Clone 1 failed");
exit(-1);
}
if ((clone2 = clone(clone_main, clone2_stack, 0, (void*)22)) == -1) {
perror("Clone 2 failed");
exit(-2);
}
if ((clone3 = clone(clone_main, clone3_stack, 0, (void*)33)) == -1) {
perror("Clone 3 failed");
exit(-3);
}
sleep(1);
printf("Parent: waiting for the clones to die.\n");
nostatus = status = 0;
while (1) {
if ((wpid = waitpid(clone1, &result, WNOHANG|__WCLONE)) == -1)
nostatus |= GOT1;
if (wpid == clone1) {
status |= GOT1;
printf("Clone1 gave back %i\n", WEXITSTATUS(result));
}
if ((wpid = waitpid(clone2, &result, WNOHANG|__WCLONE)) == -1)
nostatus |= GOT2;
if (wpid == clone2) {
status |= GOT2;
printf("Clone2 gave back %i\n", WEXITSTATUS(result));
}
if ((wpid = waitpid(clone3, &result, WNOHANG|__WCLONE)) == -1)
nostatus |= GOT3;
if (wpid == clone3) {
status |= GOT3;
printf("Clone3 gave back %i\n", WEXITSTATUS(result));
}
if (status == ALLGOT || nostatus == ALLGOT)
break;
}
if (status == ALLGOT) {
printf("Clones exited.\nGoodbye.\n");
return EXIT_SUCCESS;
} else {
perror("Waiting for clones failed");
return EXIT_FAILURE;
}
}
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
|
