Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1 | /* $OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu> |
| 5 | * Copyright 2007-2012 Niels Provos and Nick Mathewson |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | #include "event2/event-config.h" |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 30 | #include "evconfig-private.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 31 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 32 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 33 | #define WIN32_LEAN_AND_MEAN |
| 34 | #include <winsock2.h> |
| 35 | #include <windows.h> |
| 36 | #undef WIN32_LEAN_AND_MEAN |
| 37 | #endif |
| 38 | #include <sys/types.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 39 | #ifdef EVENT__HAVE_SYS_TIME_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 40 | #include <sys/time.h> |
| 41 | #endif |
| 42 | #include <sys/queue.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 43 | #ifdef EVENT__HAVE_SYS_SOCKET_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 44 | #include <sys/socket.h> |
| 45 | #endif |
| 46 | #include <signal.h> |
| 47 | #include <stdio.h> |
| 48 | #include <stdlib.h> |
| 49 | #include <string.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 50 | #ifdef EVENT__HAVE_UNISTD_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 51 | #include <unistd.h> |
| 52 | #endif |
| 53 | #include <errno.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 54 | #ifdef EVENT__HAVE_FCNTL_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 55 | #include <fcntl.h> |
| 56 | #endif |
| 57 | |
| 58 | #include "event2/event.h" |
| 59 | #include "event2/event_struct.h" |
| 60 | #include "event-internal.h" |
| 61 | #include "event2/util.h" |
| 62 | #include "evsignal-internal.h" |
| 63 | #include "log-internal.h" |
| 64 | #include "evmap-internal.h" |
| 65 | #include "evthread-internal.h" |
| 66 | |
| 67 | /* |
| 68 | signal.c |
| 69 | |
| 70 | This is the signal-handling implementation we use for backends that don't |
| 71 | have a better way to do signal handling. It uses sigaction() or signal() |
| 72 | to set a signal handler, and a socket pair to tell the event base when |
| 73 | |
| 74 | Note that I said "the event base" : only one event base can be set up to use |
| 75 | this at a time. For historical reasons and backward compatibility, if you |
| 76 | add an event for a signal to event_base A, then add an event for a signal |
| 77 | (any signal!) to event_base B, event_base B will get informed about the |
| 78 | signal, but event_base A won't. |
| 79 | |
| 80 | It would be neat to change this behavior in some future version of Libevent. |
| 81 | kqueue already does something far more sensible. We can make all backends |
| 82 | on Linux do a reasonable thing using signalfd. |
| 83 | */ |
| 84 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 85 | #ifndef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 86 | /* Windows wants us to call our signal handlers as __cdecl. Nobody else |
| 87 | * expects you to do anything crazy like this. */ |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 88 | #ifndef __cdecl |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 89 | #define __cdecl |
| 90 | #endif |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 91 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 92 | |
| 93 | static int evsig_add(struct event_base *, evutil_socket_t, short, short, void *); |
| 94 | static int evsig_del(struct event_base *, evutil_socket_t, short, short, void *); |
| 95 | |
| 96 | static const struct eventop evsigops = { |
| 97 | "signal", |
| 98 | NULL, |
| 99 | evsig_add, |
| 100 | evsig_del, |
| 101 | NULL, |
| 102 | NULL, |
| 103 | 0, 0, 0 |
| 104 | }; |
| 105 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 106 | #ifndef EVENT__DISABLE_THREAD_SUPPORT |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 107 | /* Lock for evsig_base and evsig_base_n_signals_added fields. */ |
| 108 | static void *evsig_base_lock = NULL; |
| 109 | #endif |
| 110 | /* The event base that's currently getting informed about signals. */ |
| 111 | static struct event_base *evsig_base = NULL; |
| 112 | /* A copy of evsig_base->sigev_n_signals_added. */ |
| 113 | static int evsig_base_n_signals_added = 0; |
| 114 | static evutil_socket_t evsig_base_fd = -1; |
| 115 | |
| 116 | static void __cdecl evsig_handler(int sig); |
| 117 | |
| 118 | #define EVSIGBASE_LOCK() EVLOCK_LOCK(evsig_base_lock, 0) |
| 119 | #define EVSIGBASE_UNLOCK() EVLOCK_UNLOCK(evsig_base_lock, 0) |
| 120 | |
| 121 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 122 | evsig_set_base_(struct event_base *base) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 123 | { |
| 124 | EVSIGBASE_LOCK(); |
| 125 | evsig_base = base; |
| 126 | evsig_base_n_signals_added = base->sig.ev_n_signals_added; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 127 | evsig_base_fd = base->sig.ev_signal_pair[1]; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 128 | EVSIGBASE_UNLOCK(); |
| 129 | } |
| 130 | |
| 131 | /* Callback for when the signal handler write a byte to our signaling socket */ |
| 132 | static void |
| 133 | evsig_cb(evutil_socket_t fd, short what, void *arg) |
| 134 | { |
| 135 | static char signals[1024]; |
| 136 | ev_ssize_t n; |
| 137 | int i; |
| 138 | int ncaught[NSIG]; |
| 139 | struct event_base *base; |
| 140 | |
| 141 | base = arg; |
| 142 | |
| 143 | memset(&ncaught, 0, sizeof(ncaught)); |
| 144 | |
| 145 | while (1) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 146 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 147 | n = recv(fd, signals, sizeof(signals), 0); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 148 | #else |
| 149 | n = read(fd, signals, sizeof(signals)); |
| 150 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 151 | if (n == -1) { |
| 152 | int err = evutil_socket_geterror(fd); |
| 153 | if (! EVUTIL_ERR_RW_RETRIABLE(err)) |
| 154 | event_sock_err(1, fd, "%s: recv", __func__); |
| 155 | break; |
| 156 | } else if (n == 0) { |
| 157 | /* XXX warn? */ |
| 158 | break; |
| 159 | } |
| 160 | for (i = 0; i < n; ++i) { |
| 161 | ev_uint8_t sig = signals[i]; |
| 162 | if (sig < NSIG) |
| 163 | ncaught[sig]++; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | EVBASE_ACQUIRE_LOCK(base, th_base_lock); |
| 168 | for (i = 0; i < NSIG; ++i) { |
| 169 | if (ncaught[i]) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 170 | evmap_signal_active_(base, i, ncaught[i]); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 171 | } |
| 172 | EVBASE_RELEASE_LOCK(base, th_base_lock); |
| 173 | } |
| 174 | |
| 175 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 176 | evsig_init_(struct event_base *base) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 177 | { |
| 178 | /* |
| 179 | * Our signal handler is going to write to one end of the socket |
| 180 | * pair to wake up our event loop. The event loop then scans for |
| 181 | * signals that got delivered. |
| 182 | */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 183 | if (evutil_make_internal_pipe_(base->sig.ev_signal_pair) == -1) { |
| 184 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 185 | /* Make this nonfatal on win32, where sometimes people |
| 186 | have localhost firewalled. */ |
| 187 | event_sock_warn(-1, "%s: socketpair", __func__); |
| 188 | #else |
| 189 | event_sock_err(1, -1, "%s: socketpair", __func__); |
| 190 | #endif |
| 191 | return -1; |
| 192 | } |
| 193 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 194 | if (base->sig.sh_old) { |
| 195 | mm_free(base->sig.sh_old); |
| 196 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 197 | base->sig.sh_old = NULL; |
| 198 | base->sig.sh_old_max = 0; |
| 199 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 200 | event_assign(&base->sig.ev_signal, base, base->sig.ev_signal_pair[0], |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 201 | EV_READ | EV_PERSIST, evsig_cb, base); |
| 202 | |
| 203 | base->sig.ev_signal.ev_flags |= EVLIST_INTERNAL; |
| 204 | event_priority_set(&base->sig.ev_signal, 0); |
| 205 | |
| 206 | base->evsigsel = &evsigops; |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | /* Helper: set the signal handler for evsignal to handler in base, so that |
| 212 | * we can restore the original handler when we clear the current one. */ |
| 213 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 214 | evsig_set_handler_(struct event_base *base, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 215 | int evsignal, void (__cdecl *handler)(int)) |
| 216 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 217 | #ifdef EVENT__HAVE_SIGACTION |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 218 | struct sigaction sa; |
| 219 | #else |
| 220 | ev_sighandler_t sh; |
| 221 | #endif |
| 222 | struct evsig_info *sig = &base->sig; |
| 223 | void *p; |
| 224 | |
| 225 | /* |
| 226 | * resize saved signal handler array up to the highest signal number. |
| 227 | * a dynamic array is used to keep footprint on the low side. |
| 228 | */ |
| 229 | if (evsignal >= sig->sh_old_max) { |
| 230 | int new_max = evsignal + 1; |
| 231 | event_debug(("%s: evsignal (%d) >= sh_old_max (%d), resizing", |
| 232 | __func__, evsignal, sig->sh_old_max)); |
| 233 | p = mm_realloc(sig->sh_old, new_max * sizeof(*sig->sh_old)); |
| 234 | if (p == NULL) { |
| 235 | event_warn("realloc"); |
| 236 | return (-1); |
| 237 | } |
| 238 | |
| 239 | memset((char *)p + sig->sh_old_max * sizeof(*sig->sh_old), |
| 240 | 0, (new_max - sig->sh_old_max) * sizeof(*sig->sh_old)); |
| 241 | |
| 242 | sig->sh_old_max = new_max; |
| 243 | sig->sh_old = p; |
| 244 | } |
| 245 | |
| 246 | /* allocate space for previous handler out of dynamic array */ |
| 247 | sig->sh_old[evsignal] = mm_malloc(sizeof *sig->sh_old[evsignal]); |
| 248 | if (sig->sh_old[evsignal] == NULL) { |
| 249 | event_warn("malloc"); |
| 250 | return (-1); |
| 251 | } |
| 252 | |
| 253 | /* save previous handler and setup new handler */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 254 | #ifdef EVENT__HAVE_SIGACTION |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 255 | memset(&sa, 0, sizeof(sa)); |
| 256 | sa.sa_handler = handler; |
| 257 | sa.sa_flags |= SA_RESTART; |
| 258 | sigfillset(&sa.sa_mask); |
| 259 | |
| 260 | if (sigaction(evsignal, &sa, sig->sh_old[evsignal]) == -1) { |
| 261 | event_warn("sigaction"); |
| 262 | mm_free(sig->sh_old[evsignal]); |
| 263 | sig->sh_old[evsignal] = NULL; |
| 264 | return (-1); |
| 265 | } |
| 266 | #else |
| 267 | if ((sh = signal(evsignal, handler)) == SIG_ERR) { |
| 268 | event_warn("signal"); |
| 269 | mm_free(sig->sh_old[evsignal]); |
| 270 | sig->sh_old[evsignal] = NULL; |
| 271 | return (-1); |
| 272 | } |
| 273 | *sig->sh_old[evsignal] = sh; |
| 274 | #endif |
| 275 | |
| 276 | return (0); |
| 277 | } |
| 278 | |
| 279 | static int |
| 280 | evsig_add(struct event_base *base, evutil_socket_t evsignal, short old, short events, void *p) |
| 281 | { |
| 282 | struct evsig_info *sig = &base->sig; |
| 283 | (void)p; |
| 284 | |
| 285 | EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG); |
| 286 | |
| 287 | /* catch signals if they happen quickly */ |
| 288 | EVSIGBASE_LOCK(); |
| 289 | if (evsig_base != base && evsig_base_n_signals_added) { |
| 290 | event_warnx("Added a signal to event base %p with signals " |
| 291 | "already added to event_base %p. Only one can have " |
| 292 | "signals at a time with the %s backend. The base with " |
| 293 | "the most recently added signal or the most recent " |
| 294 | "event_base_loop() call gets preference; do " |
| 295 | "not rely on this behavior in future Libevent versions.", |
| 296 | base, evsig_base, base->evsel->name); |
| 297 | } |
| 298 | evsig_base = base; |
| 299 | evsig_base_n_signals_added = ++sig->ev_n_signals_added; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 300 | evsig_base_fd = base->sig.ev_signal_pair[1]; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 301 | EVSIGBASE_UNLOCK(); |
| 302 | |
| 303 | event_debug(("%s: %d: changing signal handler", __func__, (int)evsignal)); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 304 | if (evsig_set_handler_(base, (int)evsignal, evsig_handler) == -1) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 305 | goto err; |
| 306 | } |
| 307 | |
| 308 | |
| 309 | if (!sig->ev_signal_added) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 310 | if (event_add_nolock_(&sig->ev_signal, NULL, 0)) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 311 | goto err; |
| 312 | sig->ev_signal_added = 1; |
| 313 | } |
| 314 | |
| 315 | return (0); |
| 316 | |
| 317 | err: |
| 318 | EVSIGBASE_LOCK(); |
| 319 | --evsig_base_n_signals_added; |
| 320 | --sig->ev_n_signals_added; |
| 321 | EVSIGBASE_UNLOCK(); |
| 322 | return (-1); |
| 323 | } |
| 324 | |
| 325 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 326 | evsig_restore_handler_(struct event_base *base, int evsignal) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 327 | { |
| 328 | int ret = 0; |
| 329 | struct evsig_info *sig = &base->sig; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 330 | #ifdef EVENT__HAVE_SIGACTION |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 331 | struct sigaction *sh; |
| 332 | #else |
| 333 | ev_sighandler_t *sh; |
| 334 | #endif |
| 335 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 336 | if (evsignal >= sig->sh_old_max) { |
| 337 | /* Can't actually restore. */ |
| 338 | /* XXXX.*/ |
| 339 | return 0; |
| 340 | } |
| 341 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 342 | /* restore previous handler */ |
| 343 | sh = sig->sh_old[evsignal]; |
| 344 | sig->sh_old[evsignal] = NULL; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 345 | #ifdef EVENT__HAVE_SIGACTION |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 346 | if (sigaction(evsignal, sh, NULL) == -1) { |
| 347 | event_warn("sigaction"); |
| 348 | ret = -1; |
| 349 | } |
| 350 | #else |
| 351 | if (signal(evsignal, *sh) == SIG_ERR) { |
| 352 | event_warn("signal"); |
| 353 | ret = -1; |
| 354 | } |
| 355 | #endif |
| 356 | |
| 357 | mm_free(sh); |
| 358 | |
| 359 | return ret; |
| 360 | } |
| 361 | |
| 362 | static int |
| 363 | evsig_del(struct event_base *base, evutil_socket_t evsignal, short old, short events, void *p) |
| 364 | { |
| 365 | EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG); |
| 366 | |
| 367 | event_debug(("%s: "EV_SOCK_FMT": restoring signal handler", |
| 368 | __func__, EV_SOCK_ARG(evsignal))); |
| 369 | |
| 370 | EVSIGBASE_LOCK(); |
| 371 | --evsig_base_n_signals_added; |
| 372 | --base->sig.ev_n_signals_added; |
| 373 | EVSIGBASE_UNLOCK(); |
| 374 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 375 | return (evsig_restore_handler_(base, (int)evsignal)); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | static void __cdecl |
| 379 | evsig_handler(int sig) |
| 380 | { |
| 381 | int save_errno = errno; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 382 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 383 | int socket_errno = EVUTIL_SOCKET_ERROR(); |
| 384 | #endif |
| 385 | ev_uint8_t msg; |
| 386 | |
| 387 | if (evsig_base == NULL) { |
| 388 | event_warnx( |
| 389 | "%s: received signal %d, but have no base configured", |
| 390 | __func__, sig); |
| 391 | return; |
| 392 | } |
| 393 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 394 | #ifndef EVENT__HAVE_SIGACTION |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 395 | signal(sig, evsig_handler); |
| 396 | #endif |
| 397 | |
| 398 | /* Wake up our notification mechanism */ |
| 399 | msg = sig; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 400 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 401 | send(evsig_base_fd, (char*)&msg, 1, 0); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 402 | #else |
| 403 | { |
| 404 | int r = write(evsig_base_fd, (char*)&msg, 1); |
| 405 | (void)r; /* Suppress 'unused return value' and 'unused var' */ |
| 406 | } |
| 407 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 408 | errno = save_errno; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 409 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 410 | EVUTIL_SET_SOCKET_ERROR(socket_errno); |
| 411 | #endif |
| 412 | } |
| 413 | |
| 414 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 415 | evsig_dealloc_(struct event_base *base) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 416 | { |
| 417 | int i = 0; |
| 418 | if (base->sig.ev_signal_added) { |
| 419 | event_del(&base->sig.ev_signal); |
| 420 | base->sig.ev_signal_added = 0; |
| 421 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 422 | /* debug event is created in evsig_init_/event_assign even when |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 423 | * ev_signal_added == 0, so unassign is required */ |
| 424 | event_debug_unassign(&base->sig.ev_signal); |
| 425 | |
| 426 | for (i = 0; i < NSIG; ++i) { |
| 427 | if (i < base->sig.sh_old_max && base->sig.sh_old[i] != NULL) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 428 | evsig_restore_handler_(base, i); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 429 | } |
| 430 | EVSIGBASE_LOCK(); |
| 431 | if (base == evsig_base) { |
| 432 | evsig_base = NULL; |
| 433 | evsig_base_n_signals_added = 0; |
| 434 | evsig_base_fd = -1; |
| 435 | } |
| 436 | EVSIGBASE_UNLOCK(); |
| 437 | |
| 438 | if (base->sig.ev_signal_pair[0] != -1) { |
| 439 | evutil_closesocket(base->sig.ev_signal_pair[0]); |
| 440 | base->sig.ev_signal_pair[0] = -1; |
| 441 | } |
| 442 | if (base->sig.ev_signal_pair[1] != -1) { |
| 443 | evutil_closesocket(base->sig.ev_signal_pair[1]); |
| 444 | base->sig.ev_signal_pair[1] = -1; |
| 445 | } |
| 446 | base->sig.sh_old_max = 0; |
| 447 | |
| 448 | /* per index frees are handled in evsig_del() */ |
| 449 | if (base->sig.sh_old) { |
| 450 | mm_free(base->sig.sh_old); |
| 451 | base->sig.sh_old = NULL; |
| 452 | } |
| 453 | } |
| 454 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 455 | static void |
| 456 | evsig_free_globals_locks(void) |
| 457 | { |
| 458 | #ifndef EVENT__DISABLE_THREAD_SUPPORT |
| 459 | if (evsig_base_lock != NULL) { |
| 460 | EVTHREAD_FREE_LOCK(evsig_base_lock, 0); |
| 461 | evsig_base_lock = NULL; |
| 462 | } |
| 463 | #endif |
| 464 | return; |
| 465 | } |
| 466 | |
| 467 | void |
| 468 | evsig_free_globals_(void) |
| 469 | { |
| 470 | evsig_free_globals_locks(); |
| 471 | } |
| 472 | |
| 473 | #ifndef EVENT__DISABLE_THREAD_SUPPORT |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 474 | int |
| 475 | evsig_global_setup_locks_(const int enable_locks) |
| 476 | { |
| 477 | EVTHREAD_SETUP_GLOBAL_LOCK(evsig_base_lock, 0); |
| 478 | return 0; |
| 479 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 480 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 481 | #endif |