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
|
/* $FreeBSD$ */
#include <signal.h>
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
int stop_received;
int exit_received;
int cont_received;
void job_handler(int sig, siginfo_t *si, void *ctx)
{
int status;
int ret;
if (si->si_code == CLD_STOPPED) {
stop_received = 1;
kill(si->si_pid, SIGCONT);
} else if (si->si_code == CLD_EXITED) {
ret = waitpid(si->si_pid, &status, 0);
if (ret == -1)
errx(1, "waitpid");
if (!WIFEXITED(status))
errx(1, "!WIFEXITED(status)");
exit_received = 1;
} else if (si->si_code == CLD_CONTINUED) {
cont_received = 1;
}
}
void job_control_test()
{
struct sigaction sa;
pid_t pid;
int count = 10;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = job_handler;
sigaction(SIGCHLD, &sa, NULL);
stop_received = 0;
cont_received = 0;
exit_received = 0;
pid = fork();
if (pid == 0) {
kill(getpid(), SIGSTOP);
exit(1);
}
while (!(cont_received && stop_received && exit_received)) {
sleep(1);
if (--count == 0)
break;
}
if (!(cont_received && stop_received && exit_received))
errx(1, "job signals lost");
printf("job control test OK.\n");
}
void rtsig_handler(int sig, siginfo_t *si, void *ctx)
{
}
int main()
{
struct sigaction sa;
sigset_t set;
union sigval val;
/* test job control with empty signal queue */
job_control_test();
/* now full fill signal queue in kernel */
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = rtsig_handler;
sigaction(SIGRTMIN, &sa, NULL);
sigemptyset(&set);
sigaddset(&set, SIGRTMIN);
sigprocmask(SIG_BLOCK, &set, NULL);
val.sival_int = 1;
while (sigqueue(getpid(), SIGRTMIN, val))
;
/* signal queue is fully filled, test the job control again. */
job_control_test();
return (0);
}
|
