feat: build proect for restproxy
This commit is contained in:
zhangsz
481
proxy_c/third-lib/libevent/signal.c
Normal file
481
proxy_c/third-lib/libevent/signal.c
Normal file
@@ -0,0 +1,481 @@
|
||||
/* $OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
|
||||
* Copyright 2007-2012 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"
|
||||
#include "evconfig-private.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"
|
||||
#include "evthread-internal.h"
|
||||
|
||||
/*
|
||||
signal.c
|
||||
|
||||
This is the signal-handling implementation we use for backends that don't
|
||||
have a better way to do signal handling. It uses sigaction() or signal()
|
||||
to set a signal handler, and a socket pair to tell the event base when
|
||||
|
||||
Note that I said "the event base" : only one event base can be set up to use
|
||||
this at a time. For historical reasons and backward compatibility, if you
|
||||
add an event for a signal to event_base A, then add an event for a signal
|
||||
(any signal!) to event_base B, event_base B will get informed about the
|
||||
signal, but event_base A won't.
|
||||
|
||||
It would be neat to change this behavior in some future version of Libevent.
|
||||
kqueue already does something far more sensible. We can make all backends
|
||||
on Linux do a reasonable thing using signalfd.
|
||||
*/
|
||||
|
||||
#ifndef _WIN32
|
||||
/* Windows wants us to call our signal handlers as __cdecl. Nobody else
|
||||
* expects you to do anything crazy like this. */
|
||||
#ifndef __cdecl
|
||||
#define __cdecl
|
||||
#endif
|
||||
#endif
|
||||
|
||||
static int evsig_add(struct event_base *, evutil_socket_t, short, short, void *);
|
||||
static int evsig_del(struct event_base *, evutil_socket_t, short, short, void *);
|
||||
|
||||
static const struct eventop evsigops = {
|
||||
"signal",
|
||||
NULL,
|
||||
evsig_add,
|
||||
evsig_del,
|
||||
NULL,
|
||||
NULL,
|
||||
0, 0, 0
|
||||
};
|
||||
|
||||
#ifndef EVENT__DISABLE_THREAD_SUPPORT
|
||||
/* Lock for evsig_base and evsig_base_n_signals_added fields. */
|
||||
static void *evsig_base_lock = NULL;
|
||||
#endif
|
||||
/* The event base that's currently getting informed about signals. */
|
||||
static struct event_base *evsig_base = NULL;
|
||||
/* A copy of evsig_base->sigev_n_signals_added. */
|
||||
static int evsig_base_n_signals_added = 0;
|
||||
static evutil_socket_t evsig_base_fd = -1;
|
||||
|
||||
static void __cdecl evsig_handler(int sig);
|
||||
|
||||
#define EVSIGBASE_LOCK() EVLOCK_LOCK(evsig_base_lock, 0)
|
||||
#define EVSIGBASE_UNLOCK() EVLOCK_UNLOCK(evsig_base_lock, 0)
|
||||
|
||||
void
|
||||
evsig_set_base_(struct event_base *base)
|
||||
{
|
||||
EVSIGBASE_LOCK();
|
||||
evsig_base = base;
|
||||
evsig_base_n_signals_added = base->sig.ev_n_signals_added;
|
||||
evsig_base_fd = base->sig.ev_signal_pair[1];
|
||||
EVSIGBASE_UNLOCK();
|
||||
}
|
||||
|
||||
/* 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[1024];
|
||||
ev_ssize_t n;
|
||||
int i;
|
||||
int ncaught[NSIG];
|
||||
struct event_base *base;
|
||||
|
||||
base = arg;
|
||||
|
||||
memset(&ncaught, 0, sizeof(ncaught));
|
||||
|
||||
while (1) {
|
||||
#ifdef _WIN32
|
||||
n = recv(fd, signals, sizeof(signals), 0);
|
||||
#else
|
||||
n = read(fd, signals, sizeof(signals));
|
||||
#endif
|
||||
if (n == -1) {
|
||||
int err = evutil_socket_geterror(fd);
|
||||
if (! EVUTIL_ERR_RW_RETRIABLE(err))
|
||||
event_sock_err(1, fd, "%s: recv", __func__);
|
||||
break;
|
||||
} else if (n == 0) {
|
||||
/* XXX warn? */
|
||||
break;
|
||||
}
|
||||
for (i = 0; i < n; ++i) {
|
||||
ev_uint8_t sig = signals[i];
|
||||
if (sig < NSIG)
|
||||
ncaught[sig]++;
|
||||
}
|
||||
}
|
||||
|
||||
EVBASE_ACQUIRE_LOCK(base, th_base_lock);
|
||||
for (i = 0; i < NSIG; ++i) {
|
||||
if (ncaught[i])
|
||||
evmap_signal_active_(base, i, ncaught[i]);
|
||||
}
|
||||
EVBASE_RELEASE_LOCK(base, th_base_lock);
|
||||
}
|
||||
|
||||
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_make_internal_pipe_(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;
|
||||
}
|
||||
|
||||
if (base->sig.sh_old) {
|
||||
mm_free(base->sig.sh_old);
|
||||
}
|
||||
base->sig.sh_old = NULL;
|
||||
base->sig.sh_old_max = 0;
|
||||
|
||||
event_assign(&base->sig.ev_signal, base, base->sig.ev_signal_pair[0],
|
||||
EV_READ | EV_PERSIST, evsig_cb, base);
|
||||
|
||||
base->sig.ev_signal.ev_flags |= EVLIST_INTERNAL;
|
||||
event_priority_set(&base->sig.ev_signal, 0);
|
||||
|
||||
base->evsigsel = &evsigops;
|
||||
|
||||
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, evutil_socket_t evsignal, short old, short events, void *p)
|
||||
{
|
||||
struct evsig_info *sig = &base->sig;
|
||||
(void)p;
|
||||
|
||||
EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG);
|
||||
|
||||
/* catch signals if they happen quickly */
|
||||
EVSIGBASE_LOCK();
|
||||
if (evsig_base != base && evsig_base_n_signals_added) {
|
||||
event_warnx("Added a signal to event base %p with signals "
|
||||
"already added to event_base %p. Only one can have "
|
||||
"signals at a time with the %s backend. The base with "
|
||||
"the most recently added signal or the most recent "
|
||||
"event_base_loop() call gets preference; do "
|
||||
"not rely on this behavior in future Libevent versions.",
|
||||
base, evsig_base, base->evsel->name);
|
||||
}
|
||||
evsig_base = base;
|
||||
evsig_base_n_signals_added = ++sig->ev_n_signals_added;
|
||||
evsig_base_fd = base->sig.ev_signal_pair[1];
|
||||
EVSIGBASE_UNLOCK();
|
||||
|
||||
event_debug(("%s: %d: changing signal handler", __func__, (int)evsignal));
|
||||
if (evsig_set_handler_(base, (int)evsignal, evsig_handler) == -1) {
|
||||
goto err;
|
||||
}
|
||||
|
||||
|
||||
if (!sig->ev_signal_added) {
|
||||
if (event_add_nolock_(&sig->ev_signal, NULL, 0))
|
||||
goto err;
|
||||
sig->ev_signal_added = 1;
|
||||
}
|
||||
|
||||
return (0);
|
||||
|
||||
err:
|
||||
EVSIGBASE_LOCK();
|
||||
--evsig_base_n_signals_added;
|
||||
--sig->ev_n_signals_added;
|
||||
EVSIGBASE_UNLOCK();
|
||||
return (-1);
|
||||
}
|
||||
|
||||
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
|
||||
|
||||
if (evsignal >= sig->sh_old_max) {
|
||||
/* Can't actually restore. */
|
||||
/* XXXX.*/
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* 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, evutil_socket_t evsignal, short old, short events, void *p)
|
||||
{
|
||||
EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG);
|
||||
|
||||
event_debug(("%s: "EV_SOCK_FMT": restoring signal handler",
|
||||
__func__, EV_SOCK_ARG(evsignal)));
|
||||
|
||||
EVSIGBASE_LOCK();
|
||||
--evsig_base_n_signals_added;
|
||||
--base->sig.ev_n_signals_added;
|
||||
EVSIGBASE_UNLOCK();
|
||||
|
||||
return (evsig_restore_handler_(base, (int)evsignal));
|
||||
}
|
||||
|
||||
static void __cdecl
|
||||
evsig_handler(int sig)
|
||||
{
|
||||
int save_errno = errno;
|
||||
#ifdef _WIN32
|
||||
int socket_errno = EVUTIL_SOCKET_ERROR();
|
||||
#endif
|
||||
ev_uint8_t msg;
|
||||
|
||||
if (evsig_base == NULL) {
|
||||
event_warnx(
|
||||
"%s: received signal %d, but have no base configured",
|
||||
__func__, sig);
|
||||
return;
|
||||
}
|
||||
|
||||
#ifndef EVENT__HAVE_SIGACTION
|
||||
signal(sig, evsig_handler);
|
||||
#endif
|
||||
|
||||
/* Wake up our notification mechanism */
|
||||
msg = sig;
|
||||
#ifdef _WIN32
|
||||
send(evsig_base_fd, (char*)&msg, 1, 0);
|
||||
#else
|
||||
{
|
||||
int r = write(evsig_base_fd, (char*)&msg, 1);
|
||||
(void)r; /* Suppress 'unused return value' and 'unused var' */
|
||||
}
|
||||
#endif
|
||||
errno = save_errno;
|
||||
#ifdef _WIN32
|
||||
EVUTIL_SET_SOCKET_ERROR(socket_errno);
|
||||
#endif
|
||||
}
|
||||
|
||||
void
|
||||
evsig_dealloc_(struct event_base *base)
|
||||
{
|
||||
int i = 0;
|
||||
if (base->sig.ev_signal_added) {
|
||||
event_del(&base->sig.ev_signal);
|
||||
base->sig.ev_signal_added = 0;
|
||||
}
|
||||
/* debug event is created in evsig_init_/event_assign even when
|
||||
* ev_signal_added == 0, so unassign is required */
|
||||
event_debug_unassign(&base->sig.ev_signal);
|
||||
|
||||
for (i = 0; i < NSIG; ++i) {
|
||||
if (i < base->sig.sh_old_max && base->sig.sh_old[i] != NULL)
|
||||
evsig_restore_handler_(base, i);
|
||||
}
|
||||
EVSIGBASE_LOCK();
|
||||
if (base == evsig_base) {
|
||||
evsig_base = NULL;
|
||||
evsig_base_n_signals_added = 0;
|
||||
evsig_base_fd = -1;
|
||||
}
|
||||
EVSIGBASE_UNLOCK();
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
evsig_free_globals_locks(void)
|
||||
{
|
||||
#ifndef EVENT__DISABLE_THREAD_SUPPORT
|
||||
if (evsig_base_lock != NULL) {
|
||||
EVTHREAD_FREE_LOCK(evsig_base_lock, 0);
|
||||
evsig_base_lock = NULL;
|
||||
}
|
||||
#endif
|
||||
return;
|
||||
}
|
||||
|
||||
void
|
||||
evsig_free_globals_(void)
|
||||
{
|
||||
evsig_free_globals_locks();
|
||||
}
|
||||
|
||||
#ifndef EVENT__DISABLE_THREAD_SUPPORT
|
||||
int
|
||||
evsig_global_setup_locks_(const int enable_locks)
|
||||
{
|
||||
EVTHREAD_SETUP_GLOBAL_LOCK(evsig_base_lock, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
||||
Reference in New Issue
Block a user