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/* $OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $ */
/*
* Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
* Copyright 2007-2010 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "event2/event-config.h"
#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
#endif
#include <sys/types.h>
#ifdef _EVENT_HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/queue.h>
#ifdef _EVENT_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _EVENT_HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#ifdef _EVENT_HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "event2/event.h"
#include "event2/event_struct.h"
#include "event-internal.h"
#include "event2/util.h"
#include "evsignal-internal.h"
#include "log-internal.h"
#include "evmap-internal.h"
#ifndef WIN32
/* Windows wants us to call our signal handlers as __cdecl. Nobody else
* expects you to do anything crazy like this. */
#define __cdecl
#endif
static int evsig_add(struct event_base *, int, short, short, void *);
static int evsig_del(struct event_base *, int, short, short, void *);
static const struct eventop evsigops = {
"signal",
NULL,
evsig_add,
evsig_del,
NULL,
NULL,
0, 0, 0
};
struct event_base *evsig_base = NULL;
static void __cdecl evsig_handler(int sig);
/* Callback for when the signal handler write a byte to our signaling socket */
static void
evsig_cb(evutil_socket_t fd, short what, void *arg)
{
static char signals[1];
ev_ssize_t n;
(void)arg; /* Suppress "unused variable" warning. */
n = recv(fd, signals, sizeof(signals), 0);
if (n == -1) {
int err = evutil_socket_geterror(fd);
if (! EVUTIL_ERR_RW_RETRIABLE(err))
event_sock_err(1, fd, "%s: recv", __func__);
}
}
int
evsig_init(struct event_base *base)
{
/*
* Our signal handler is going to write to one end of the socket
* pair to wake up our event loop. The event loop then scans for
* signals that got delivered.
*/
if (evutil_socketpair(
AF_UNIX, SOCK_STREAM, 0, base->sig.ev_signal_pair) == -1) {
#ifdef WIN32
/* Make this nonfatal on win32, where sometimes people
have localhost firewalled. */
event_sock_warn(-1, "%s: socketpair", __func__);
#else
event_sock_err(1, -1, "%s: socketpair", __func__);
#endif
return -1;
}
evutil_make_socket_closeonexec(base->sig.ev_signal_pair[0]);
evutil_make_socket_closeonexec(base->sig.ev_signal_pair[1]);
base->sig.sh_old = NULL;
base->sig.sh_old_max = 0;
base->sig.evsig_caught = 0;
memset(&base->sig.evsigcaught, 0, sizeof(sig_atomic_t)*NSIG);
evutil_make_socket_nonblocking(base->sig.ev_signal_pair[0]);
evutil_make_socket_nonblocking(base->sig.ev_signal_pair[1]);
event_assign(&base->sig.ev_signal, base, base->sig.ev_signal_pair[1],
EV_READ | EV_PERSIST, evsig_cb, &base->sig.ev_signal);
base->sig.ev_signal.ev_flags |= EVLIST_INTERNAL;
base->evsigsel = &evsigops;
base->evsigbase = &base->sig;
return 0;
}
/* Helper: set the signal handler for evsignal to handler in base, so that
* we can restore the original handler when we clear the current one. */
int
_evsig_set_handler(struct event_base *base,
int evsignal, void (__cdecl *handler)(int))
{
#ifdef _EVENT_HAVE_SIGACTION
struct sigaction sa;
#else
ev_sighandler_t sh;
#endif
struct evsig_info *sig = &base->sig;
void *p;
/*
* resize saved signal handler array up to the highest signal number.
* a dynamic array is used to keep footprint on the low side.
*/
if (evsignal >= sig->sh_old_max) {
int new_max = evsignal + 1;
event_debug(("%s: evsignal (%d) >= sh_old_max (%d), resizing",
__func__, evsignal, sig->sh_old_max));
p = mm_realloc(sig->sh_old, new_max * sizeof(*sig->sh_old));
if (p == NULL) {
event_warn("realloc");
return (-1);
}
memset((char *)p + sig->sh_old_max * sizeof(*sig->sh_old),
0, (new_max - sig->sh_old_max) * sizeof(*sig->sh_old));
sig->sh_old_max = new_max;
sig->sh_old = p;
}
/* allocate space for previous handler out of dynamic array */
sig->sh_old[evsignal] = mm_malloc(sizeof *sig->sh_old[evsignal]);
if (sig->sh_old[evsignal] == NULL) {
event_warn("malloc");
return (-1);
}
/* save previous handler and setup new handler */
#ifdef _EVENT_HAVE_SIGACTION
memset(&sa, 0, sizeof(sa));
sa.sa_handler = handler;
sa.sa_flags |= SA_RESTART;
sigfillset(&sa.sa_mask);
if (sigaction(evsignal, &sa, sig->sh_old[evsignal]) == -1) {
event_warn("sigaction");
mm_free(sig->sh_old[evsignal]);
sig->sh_old[evsignal] = NULL;
return (-1);
}
#else
if ((sh = signal(evsignal, handler)) == SIG_ERR) {
event_warn("signal");
mm_free(sig->sh_old[evsignal]);
sig->sh_old[evsignal] = NULL;
return (-1);
}
*sig->sh_old[evsignal] = sh;
#endif
return (0);
}
static int
evsig_add(struct event_base *base, int evsignal, short old, short events, void *p)
{
struct evsig_info *sig = &base->sig;
(void)p;
EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG);
event_debug(("%s: %d: changing signal handler", __func__, evsignal));
if (_evsig_set_handler(base, evsignal, evsig_handler) == -1)
return (-1);
/* catch signals if they happen quickly */
evsig_base = base;
if (!sig->ev_signal_added) {
if (event_add(&sig->ev_signal, NULL))
return (-1);
sig->ev_signal_added = 1;
}
return (0);
}
int
_evsig_restore_handler(struct event_base *base, int evsignal)
{
int ret = 0;
struct evsig_info *sig = &base->sig;
#ifdef _EVENT_HAVE_SIGACTION
struct sigaction *sh;
#else
ev_sighandler_t *sh;
#endif
/* restore previous handler */
sh = sig->sh_old[evsignal];
sig->sh_old[evsignal] = NULL;
#ifdef _EVENT_HAVE_SIGACTION
if (sigaction(evsignal, sh, NULL) == -1) {
event_warn("sigaction");
ret = -1;
}
#else
if (signal(evsignal, *sh) == SIG_ERR) {
event_warn("signal");
ret = -1;
}
#endif
mm_free(sh);
return ret;
}
static int
evsig_del(struct event_base *base, int evsignal, short old, short events, void *p)
{
EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG);
event_debug(("%s: %d: restoring signal handler", __func__, evsignal));
return (_evsig_restore_handler(base, evsignal));
}
static void __cdecl
evsig_handler(int sig)
{
int save_errno = errno;
#ifdef WIN32
int socket_errno = EVUTIL_SOCKET_ERROR();
#endif
if (evsig_base == NULL) {
event_warn(
"%s: received signal %d, but have no base configured",
__func__, sig);
return;
}
evsig_base->sig.evsigcaught[sig]++;
evsig_base->sig.evsig_caught = 1;
#ifndef _EVENT_HAVE_SIGACTION
signal(sig, evsig_handler);
#endif
/* Wake up our notification mechanism */
send(evsig_base->sig.ev_signal_pair[0], "a", 1, 0);
errno = save_errno;
#ifdef WIN32
EVUTIL_SET_SOCKET_ERROR(socket_errno);
#endif
}
void
evsig_process(struct event_base *base)
{
struct evsig_info *sig = &base->sig;
sig_atomic_t ncalls;
int i;
base->sig.evsig_caught = 0;
for (i = 1; i < NSIG; ++i) {
ncalls = sig->evsigcaught[i];
if (ncalls == 0)
continue;
sig->evsigcaught[i] -= ncalls;
evmap_signal_active(base, i, ncalls);
}
}
void
evsig_dealloc(struct event_base *base)
{
int i = 0;
if (base->sig.ev_signal_added) {
event_del(&base->sig.ev_signal);
event_debug_unassign(&base->sig.ev_signal);
base->sig.ev_signal_added = 0;
}
for (i = 0; i < NSIG; ++i) {
if (i < base->sig.sh_old_max && base->sig.sh_old[i] != NULL)
_evsig_restore_handler(base, i);
}
if (base->sig.ev_signal_pair[0] != -1) {
evutil_closesocket(base->sig.ev_signal_pair[0]);
base->sig.ev_signal_pair[0] = -1;
}
if (base->sig.ev_signal_pair[1] != -1) {
evutil_closesocket(base->sig.ev_signal_pair[1]);
base->sig.ev_signal_pair[1] = -1;
}
base->sig.sh_old_max = 0;
/* per index frees are handled in evsig_del() */
if (base->sig.sh_old) {
mm_free(base->sig.sh_old);
base->sig.sh_old = NULL;
}
}
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