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#include <signal.h>
#include <errno.h>
/* Set `sig' bit if we allow interrupt on it. */
sigset_t _sigintr = 0;
int
siginterrupt (int sig, int flag)
{
struct sigaction sa;
if (sig < 1 || sig >= NSIG) {
errno = EINVAL;
return -1;
}
if (__sigaction (sig, (struct sigaction *)0, &sa))
return -1;
if (flag) {
__sigaddset (&_sigintr, sig);
#ifdef SA_RESTART
if (!(sa.sa_flags & SA_RESTART) && (sa.sa_flags & SA_INTERRUPT))
return 0;
sa.sa_flags |= SA_INTERRUPT;
sa.sa_flags &= ~ SA_RESTART;
#else
if (sa.sa_flags & SA_INTERRUPT) return 0;
sa.sa_flags |= SA_INTERRUPT;
#endif
}
else {
__sigdelset (&_sigintr, sig);
#ifdef SA_RESTART
if ((sa.sa_flags & SA_RESTART) && !(sa.sa_flags & SA_INTERRUPT))
return 0;
sa.sa_flags &= ~ SA_INTERRUPT;
sa.sa_flags |= SA_RESTART;
#else
if (!(sa.sa_flags & SA_INTERRUPT)) return 0;
sa.sa_flags &= ~ SA_INTERRUPT;
#endif
}
return __sigaction (sig, &sa, (struct sigaction *)0);
}
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