third_party/ulib/musl/src/signal/sigismember.c

#include <signal.h>

int sigismember(const sigset_t* set, int sig) {
    unsigned s = sig - 1;
    if (s >= _NSIG - 1)
        return 0;
    return !!(set->__bits[s / 8 / sizeof *set->__bits] & 1UL << (s & (8 * sizeof *set->__bits - 1)));
}