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

#include <errno.h>
#include <signal.h>

int sigprocmask(int how, const sigset_t* restrict set, sigset_t* restrict old) {
    int r = pthread_sigmask(how, set, old);
    if (!r)
        return r;
    errno = r;
    return -1;
}