1#include <signal.h>
 2#include <errno.h>
 3#include "syscall.h"
 4
 5int pthread_sigmask(int how, const sigset_t *restrict set, sigset_t *restrict old)
 6{
 7	int ret;
 8	if (set && (unsigned)how - SIG_BLOCK > 2U) return EINVAL;
 9	ret = -__syscall(SYS_rt_sigprocmask, how, set, old, _NSIG/8);
10	if (!ret && old) {
11		if (sizeof old->__bits[0] == 8) {
12			old->__bits[0] &= ~0x380000000ULL;
13		} else {
14			old->__bits[0] &= ~0x80000000UL;
15			old->__bits[1] &= ~0x3UL;
16		}
17	}
18	return ret;
19}