103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
#include <sys/types.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int stop_received;
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int exit_received;
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int cont_received;
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void
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job_handler(int sig, siginfo_t *si, void *ctx)
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{
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int status;
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int ret;
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if (si->si_code == CLD_STOPPED) {
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printf("%d: stop received\n", si->si_pid);
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stop_received = 1;
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kill(si->si_pid, SIGCONT);
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} else if (si->si_code == CLD_EXITED) {
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printf("%d: exit received\n", si->si_pid);
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ret = waitpid(si->si_pid, &status, 0);
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if (ret == -1)
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errx(1, "waitpid");
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if (!WIFEXITED(status))
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errx(1, "!WIFEXITED(status)");
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exit_received = 1;
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} else if (si->si_code == CLD_CONTINUED) {
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printf("%d: cont received\n", si->si_pid);
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cont_received = 1;
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}
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}
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void
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job_control_test(void)
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{
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struct sigaction sa;
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pid_t pid;
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int count = 10;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_SIGINFO;
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sa.sa_sigaction = job_handler;
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sigaction(SIGCHLD, &sa, NULL);
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stop_received = 0;
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cont_received = 0;
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exit_received = 0;
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fflush(stdout);
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pid = fork();
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if (pid == 0) {
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printf("child %d\n", getpid());
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kill(getpid(), SIGSTOP);
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sleep(2);
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exit(1);
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}
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while (!(cont_received && stop_received && exit_received)) {
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sleep(1);
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if (--count == 0)
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break;
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}
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if (!(cont_received && stop_received && exit_received))
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errx(1, "job signals lost");
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printf("job control test OK.\n");
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}
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void
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rtsig_handler(int sig, siginfo_t *si, void *ctx)
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{
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}
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int
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main()
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{
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struct sigaction sa;
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sigset_t set;
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union sigval val;
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/* test job control with empty signal queue */
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job_control_test();
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/* now full fill signal queue in kernel */
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_SIGINFO;
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sa.sa_sigaction = rtsig_handler;
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sigaction(SIGRTMIN, &sa, NULL);
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sigemptyset(&set);
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sigaddset(&set, SIGRTMIN);
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sigprocmask(SIG_BLOCK, &set, NULL);
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val.sival_int = 1;
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while (sigqueue(getpid(), SIGRTMIN, val))
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;
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/* signal queue is fully filled, test the job control again. */
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job_control_test();
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return (0);
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}
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