Hi,
>From SUSv3, I expected SIGCHLD from dead processes (already reaped by wait(2))
should be cleared. But it seems that such situation is not handled in Linux.
Here is a test program. set sigchld handler and call waitpid() in main().
==
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
int sigchld_handler(int sig,siginfo_t *info, void *uc)
{
fprintf(stderr,"Letter from the hell...(%d)\n",info->si_pid);
}
int main(int argc, char *argv)
{
struct sigaction act;
sigset_t block;
int status;
pid_t pid;
sigemptyset(&block);
sigaddset(&block, SIGCHLD);
act.sa_sigaction = sigchld_handler;
act.sa_mask = block;
act.sa_flags = SA_SIGINFO|SA_RESTART;
sigaction(SIGCHLD,&act,NULL);
pid = fork();
if (!pid) {
sleep(3);
exit(0);
}
sigprocmask(SIG_BLOCK, &block, NULL);
pid = waitpid(pid, &status, 0);
fprintf(stderr,"wait end -> %d\n",pid);
sigprocmask(SIG_UNBLOCK, &block, NULL);
exit(0);
}
==
Result is here
==
[EMAIL PROTECTED] ~]$ ./waittest
wait end -> 5841
Letter from the hell...(5841)
==
Is this an expected result ? I think SIGCHLD shouldn't be delivered.
-Kame
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