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#include "apue.h"
volatile sig_atomic_t quitflag; /* set nonzero by signal handler */
static void
sig_int(int signo) /* one signal handler for SIGINT and SIGQUIT */
{
if (signo == SIGINT)
printf("\ninterrupt\n");
else if (signo == SIGQUIT)
quitflag = 1; /* set flag for main loop */
}
int
main(void)
{
sigset_t newmask, oldmask, zeromask;
if (signal(SIGINT, sig_int) == SIG_ERR)
err_sys("signal(SIGINT) error");
if (signal(SIGQUIT, sig_int) == SIG_ERR)
err_sys("signal(SIGQUIT) error");
sigemptyset(&zeromask);
sigemptyset(&newmask);
sigaddset(&newmask, SIGQUIT);
/*
* Block SIGQUIT and save current signal mask.
*/
if (sigprocmask(SIG_BLOCK, &newmask, &oldmask) < 0)
err_sys("SIG_BLOCK error");
while (quitflag == 0)
sigsuspend(&zeromask);
/*
* SIGQUIT has been caught and is now blocked; do whatever.
*/
quitflag = 0;
/*
* Reset signal mask which unblocks SIGQUIT.
*/
if (sigprocmask(SIG_SETMASK, &oldmask, NULL) < 0)
err_sys("SIG_SETMASK error");
exit(0);
}
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