This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <stdio.h> | |
#include <signal.h> | |
#include <unistd.h> | |
#include <assert.h> | |
// Test program to ensure OS correctly returns full exit status in si_status member | |
// of siginfo_t in SIGCHLD handler, as required by POSIX. Linux fails, FreeBSD succeeds. | |
sig_atomic_t exit_status; | |
void sigchld_handler(int n, siginfo_t *si, void *v) | |
{ | |
exit_status = si->si_status; | |
} | |
int main(int argc, char **argv) | |
{ | |
assert(sizeof(sig_atomic_t) >= 2); // enough for 0x1234 test value | |
struct sigaction act; | |
act.sa_sigaction = sigchld_handler; | |
act.sa_flags = SA_SIGINFO; | |
sigemptyset(&act.sa_mask); | |
sigaction(SIGCHLD, &act, NULL); | |
if (fork() == 0) { | |
_exit(0x1234); | |
} | |
sleep(3); | |
printf("exit status was: %x\n", exit_status); | |
return 0; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment