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#include <signal.h>
#include <errno.h>
#define __sigmask(sig) ( ((unsigned long)1) << (((sig)-1) % (8*sizeof(unsigned long))) )
#define __sigword(sig) ( ((sig)-1) / (8*sizeof(unsigned long)) )
int sigdelset(sigset_t *set, int signo) {
if ((signo<1)||(signo>SIGRTMAX)) {
(*__errno_location())=EINVAL;
return -1;
} else {
unsigned long __mask = __sigmask (signo);
unsigned long __word = __sigword (signo);
set->sig[__word]&=~__mask;
return 0;
}
}
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