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- #include <stdlib.h>
- #include <string.h>
- #include <errno.h>
- #include <stdio.h>
- #include <sys/signal.h>
- #include <sys/wait.h>
- #include <unistd.h>
- void test_handler(int signo)
- {
- write(1, "caught SIGCHLD\n", 15);
- return;
- }
- int main(void)
- {
- pid_t mypid;
- struct sigaction siga;
- static sigset_t sigset;
- /* Set up sighandling */
- sigfillset(&sigset);
- siga.sa_handler = test_handler;
- siga.sa_mask = sigset;
- 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;
- }
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