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/* $OpenBSD: kqueue-signal.c,v 1.3 2016/09/20 23:05:27 bluhm Exp $ */
/*
* Written by Philip Guenther <guenther@openbsd.org> 2011 Public Domain
*/
#include <sys/types.h>
#include <sys/event.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "main.h"
volatile sig_atomic_t saw_usr1 = 0;
volatile sig_atomic_t result = 0;
int kq;
int
sigtest(int signum, int catch)
{
struct kevent ke;
struct timespec ts;
ts.tv_sec = 10;
ts.tv_nsec = 0;
ASS(kevent(kq, NULL, 0, &ke, 1, &ts) == 1,
warn("can't fetch event on kqueue"));
ASSX(ke.filter == EVFILT_SIGNAL);
ASSX(ke.ident == signum);
ASSX(ke.data == catch);
return (0);
}
void
usr1handler(int signum)
{
saw_usr1 = 1;
result = sigtest(SIGUSR1, 1);
}
int
do_signal(void)
{
struct kevent ke;
pid_t pid = getpid();
sigset_t mask;
ASS((kq = kqueue()) >= 0, warn("kqueue"));
signal(SIGUSR1, usr1handler);
signal(SIGUSR2, SIG_IGN);
EV_SET(&ke, SIGUSR1, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, NULL);
ASS(kevent(kq, &ke, 1, NULL, 0, NULL) == 0,
warn("can't register events on kqueue"));
EV_SET(&ke, SIGUSR2, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, NULL);
ASS(kevent(kq, &ke, 1, NULL, 0, NULL) == 0,
warn("can't register events on kqueue"));
EV_SET(&ke, 10000, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, NULL);
ASS(kevent(kq, &ke, 1, NULL, 0, NULL) != 0,
warnx("registered bogus signal on kqueue"));
ASS(errno == EINVAL,
warn("registering bogus signal on kqueue returned wrong error"));
ASSX(saw_usr1 == 0);
kill(pid, SIGUSR1);
ASSX(saw_usr1 == 1);
kill(pid, SIGUSR2);
ASSX(sigtest(SIGUSR2, 1) == 0);
kill(pid, SIGUSR2);
kill(pid, SIGUSR2);
ASSX(sigtest(SIGUSR2, 2) == 0);
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
sigaddset(&mask, SIGUSR2);
sigprocmask(SIG_BLOCK, &mask, NULL);
signal(SIGUSR1, SIG_DFL);
kill(pid, SIGUSR1);
kill(pid, SIGUSR2);
close(kq);
return (0);
}
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