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
|
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <sys/signal.h>
#include <sys/wait.h>
#include <unistd.h>
#ifdef __ARCH_USE_MMU__
static void test_handler(int signo)
{
write(1, "caught SIGCHLD\n", 15);
return;
}
int main(void)
{
pid_t mypid;
struct sigaction siga;
static sigset_t set;
/* Set up sighandling */
sigfillset(&set);
siga.sa_handler = test_handler;
siga.sa_mask = set;
siga.sa_flags = 0;
if (sigaction(SIGCHLD, &siga, (struct sigaction *)NULL) != 0) {
fprintf(stderr, "sigaction choked: %s!", strerror(errno));
exit(EXIT_FAILURE);
}
/* Setup a child process to exercise the sig handling for us */
mypid = getpid();
if (fork() == 0) {
int i;
for (i=0; i < 3; i++) {
sleep(2);
kill(mypid, SIGCHLD);
}
_exit(EXIT_SUCCESS);
}
/* Wait for signals */
write(1, "waiting for a SIGCHLD\n",22);
for(;;) {
sleep(10);
if (waitpid(-1, NULL, WNOHANG | WUNTRACED) > 0)
break;
write(1, "after sleep\n", 12);
}
printf("Bye-bye! All done!\n");
return 0;
}
#else
int main(void)
{
printf("Skipping test on non-mmu host!\n");
return 0;
}
#endif
|
