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#include "apue.h"
static void sig_quit(int);
sigset_t newmask, oldmask, pendmask;
if (signal(SIGQUIT, sig_quit) == SIG_ERR)
err_sys("can't catch SIGQUIT");
* Block SIGQUIT and save current signal mask.
sigaddset(&newmask, SIGQUIT);
if (sigprocmask(SIG_BLOCK, &newmask, &oldmask) < 0)
err_sys("SIG_BLOCK error");
sleep(5); /* SIGQUIT here will remain pending */
if (sigpending(&pendmask) < 0)
err_sys("sigpending error");
if (sigismember(&pendmask, SIGQUIT))
printf("\nSIGQUIT pending\n");
* Restore signal mask which unblocks SIGQUIT.
if (sigprocmask(SIG_SETMASK, &oldmask, NULL) < 0)
err_sys("SIG_SETMASK error");
printf("SIGQUIT unblocked\n");
sleep(5); /* SIGQUIT here will terminate with core file */
static void
sig_quit(int signo)
printf("caught SIGQUIT\n");
if (signal(SIGQUIT, SIG_DFL) == SIG_ERR)
err_sys("can't reset SIGQUIT");
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