#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
int pid;
struct sigaction act;
sigaction(SIGCHLD, NULL, &act);
act.sa_handler = SIG_IGN;
sigaction(SIGCHLD, &act, NULL);
pid = fork();
if (pid == 0) {
fprintf(stderr, "\nnobody waits for me?\n");
} else if (pid != -1) {
sleep(3);
if (waitpid(pid, NULL, 0) == -1)
perror("waitpid");
}
exit(0);
}
demonstrates the behaviour of a reported ECHILD without
the need for cron. Now it is immediately clear what the
problem is.
Note that POSIX explicitly disallows setting the action
of SIGCHLD to SIG_IGN. It follows that crond and atd are
not POSIX compliant.
Andries
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