freebsd-dev/tools/regression/sigqueue/sigqtest2/sigqtest2.c
Konstantin Belousov eb9de28f20 Tweaks for sigqueue tests:
- slightly adjust code for style, sort headers.
- in sigqtest2, print received signals, to make it easy to see why test
  failed.
- in sigqtest2, job_control_test(), cover a race by adding sleep after
  child stopped itself to allow for SIGCHLD due to stop and exit to not
  be coalesced.

MFC after:	2 weeks
2009-10-11 17:04:13 +00:00

104 lines
2.0 KiB
C

/* $FreeBSD$ */
#include <sys/types.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.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) {
printf("%d: stop received\n", si->si_pid);
stop_received = 1;
kill(si->si_pid, SIGCONT);
} else if (si->si_code == CLD_EXITED) {
printf("%d: exit received\n", si->si_pid);
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) {
printf("%d: cont received\n", si->si_pid);
cont_received = 1;
}
}
void
job_control_test(void)
{
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;
fflush(stdout);
pid = fork();
if (pid == 0) {
printf("child %d\n", getpid());
kill(getpid(), SIGSTOP);
sleep(2);
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);
}