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

#include "threads_impl.h"

int pthread_sigmask(int how, const sigset_t* restrict set, sigset_t* restrict old) {
  if ((unsigned)how - SIG_BLOCK > 2U)
    return EINVAL;
  if (old) {
    if (sizeof old->__bits[0] == 8) {
      old->__bits[0] &= ~0x380000000ULL;
    } else {
      old->__bits[0] &= ~0x80000000UL;
      old->__bits[1] &= ~0x3UL;
    }
  }
  return 0;
}