181 lines
4.4 KiB
C
181 lines
4.4 KiB
C
/* $OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $ */
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/*
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* Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <sys/_time.h>
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#endif
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include "event.h"
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#include "evsignal.h"
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#include "log.h"
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extern struct event_list signalqueue;
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static sig_atomic_t evsigcaught[NSIG];
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volatile sig_atomic_t evsignal_caught = 0;
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static struct event ev_signal;
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static int ev_signal_pair[2];
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static int ev_signal_added;
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static void evsignal_handler(int sig);
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/* Callback for when the signal handler write a byte to our signaling socket */
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static void
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evsignal_cb(int fd, short what, void *arg)
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{
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static char signals[100];
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struct event *ev = arg;
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ssize_t n;
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n = read(fd, signals, sizeof(signals));
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if (n == -1)
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event_err(1, "%s: read", __func__);
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event_add(ev, NULL);
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}
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#ifdef HAVE_SETFD
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#define FD_CLOSEONEXEC(x) do { \
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if (fcntl(x, F_SETFD, 1) == -1) \
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event_warn("fcntl(%d, F_SETFD)", x); \
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} while (0)
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#else
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#define FD_CLOSEONEXEC(x)
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#endif
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void
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evsignal_init(void)
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{
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/*
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* Our signal handler is going to write to one end of the socket
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* pair to wake up our event loop. The event loop then scans for
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* signals that got delivered.
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*/
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, ev_signal_pair) == -1)
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event_err(1, "%s: socketpair", __func__);
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FD_CLOSEONEXEC(ev_signal_pair[0]);
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FD_CLOSEONEXEC(ev_signal_pair[1]);
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fcntl(ev_signal_pair[0], F_SETFL, O_NONBLOCK);
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event_set(&ev_signal, ev_signal_pair[1], EV_READ,
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evsignal_cb, &ev_signal);
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ev_signal.ev_flags |= EVLIST_INTERNAL;
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}
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int
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evsignal_add(struct event *ev)
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{
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int evsignal;
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struct sigaction sa;
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if (ev->ev_events & (EV_READ|EV_WRITE))
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event_errx(1, "%s: EV_SIGNAL incompatible use", __func__);
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evsignal = EVENT_SIGNAL(ev);
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = evsignal_handler;
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sigfillset(&sa.sa_mask);
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sa.sa_flags |= SA_RESTART;
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if (sigaction(evsignal, &sa, NULL) == -1)
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return (-1);
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if (!ev_signal_added) {
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ev_signal_added = 1;
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event_add(&ev_signal, NULL);
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}
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return (0);
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}
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/*
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* Nothing to be done here.
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*/
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int
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evsignal_del(struct event *ev)
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{
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int evsignal;
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evsignal = EVENT_SIGNAL(ev);
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return (sigaction(EVENT_SIGNAL(ev),(struct sigaction *)SIG_DFL, NULL));
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}
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static void
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evsignal_handler(int sig)
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{
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int save_errno = errno;
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evsigcaught[sig]++;
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evsignal_caught = 1;
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/* Wake up our notification mechanism */
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write(ev_signal_pair[0], "a", 1);
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errno = save_errno;
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}
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void
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evsignal_process(void)
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{
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struct event *ev;
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sig_atomic_t ncalls;
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evsignal_caught = 0;
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TAILQ_FOREACH(ev, &signalqueue, ev_signal_next) {
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ncalls = evsigcaught[EVENT_SIGNAL(ev)];
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if (ncalls) {
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if (!(ev->ev_events & EV_PERSIST))
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event_del(ev);
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event_active(ev, EV_SIGNAL, ncalls);
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evsigcaught[EVENT_SIGNAL(ev)] = 0;
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}
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}
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}
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