github.com/afumu/libc@v0.0.6/musl/src/signal/sigprocmask.c (about)

     1  #include <signal.h>
     2  #include <errno.h>
     3  
     4  int sigprocmask(int how, const sigset_t *restrict set, sigset_t *restrict old)
     5  {
     6  	int r = pthread_sigmask(how, set, old);
     7  	if (!r) return r;
     8  	errno = r;
     9  	return -1;
    10  }