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#include <signal.h>
void (*bsd_signal(int sig, void (*func)(int)))(int)
{
struct sigaction act, oact;
act.sa_handler = func;
act.sa_flags = SA_RESTART;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, sig);
if (sigaction(sig, &act, &oact) == -1) {
return SIG_ERR;
}
return oact.sa_handler;
}
/*
XOPEN(400,700)
*/
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