git: 9front

ref: 05f8ce4c83a641d2da8e3093bdfdb61e85d9dbc8
dir: /sys/src/ape/lib/ap/plan9/sigprocmask.c/

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

sigset_t _psigblocked;

int
sigprocmask(int how, sigset_t *set, sigset_t *oset)
{
	if(oset)
		*oset = _psigblocked;
	if(how==SIG_BLOCK)
		_psigblocked |= *set;
	else if(how==SIG_UNBLOCK)
		_psigblocked &= ~*set;
	else if(how==SIG_SETMASK)
		_psigblocked = *set;
	else{
		errno = EINVAL;
		return -1;
	}
	return 0;
}