1 /* $OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $ */
4 * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
33 #include <sys/types.h>
35 #ifdef HAVE_SYS_TIME_H
38 #include <sys/_time.h>
40 #include <sys/queue.h>
41 #include <sys/socket.h>
54 #include "event-internal.h"
58 struct event_base *evsignal_base = NULL;
60 static void evsignal_handler(int sig);
62 /* Callback for when the signal handler write a byte to our signaling socket */
64 evsignal_cb(int fd, short what, void *arg)
66 static char signals[100];
67 struct event *ev = arg;
70 n = read(fd, signals, sizeof(signals));
72 event_err(1, "%s: read", __func__);
77 #define FD_CLOSEONEXEC(x) do { \
78 if (fcntl(x, F_SETFD, 1) == -1) \
79 event_warn("fcntl(%d, F_SETFD)", x); \
82 #define FD_CLOSEONEXEC(x)
86 evsignal_init(struct event_base *base)
89 * Our signal handler is going to write to one end of the socket
90 * pair to wake up our event loop. The event loop then scans for
91 * signals that got delivered.
93 if (socketpair(AF_UNIX, SOCK_STREAM, 0, base->sig.ev_signal_pair) == -1)
94 event_err(1, "%s: socketpair", __func__);
96 FD_CLOSEONEXEC(base->sig.ev_signal_pair[0]);
97 FD_CLOSEONEXEC(base->sig.ev_signal_pair[1]);
98 base->sig.evsignal_caught = 0;
99 memset(&base->sig.evsigcaught, 0, sizeof(sig_atomic_t)*NSIG);
101 fcntl(base->sig.ev_signal_pair[0], F_SETFL, O_NONBLOCK);
103 event_set(&base->sig.ev_signal, base->sig.ev_signal_pair[1], EV_READ,
104 evsignal_cb, &base->sig.ev_signal);
105 base->sig.ev_signal.ev_base = base;
106 base->sig.ev_signal.ev_flags |= EVLIST_INTERNAL;
110 evsignal_add(struct event *ev)
114 struct event_base *base = ev->ev_base;
116 if (ev->ev_events & (EV_READ|EV_WRITE))
117 event_errx(1, "%s: EV_SIGNAL incompatible use", __func__);
118 evsignal = EVENT_SIGNAL(ev);
120 memset(&sa, 0, sizeof(sa));
121 sa.sa_handler = evsignal_handler;
122 sigfillset(&sa.sa_mask);
123 sa.sa_flags |= SA_RESTART;
124 /* catch signals if they happen quickly */
125 evsignal_base = base;
127 if (sigaction(evsignal, &sa, NULL) == -1)
130 if (!base->sig.ev_signal_added) {
131 base->sig.ev_signal_added = 1;
132 event_add(&base->sig.ev_signal, NULL);
139 evsignal_del(struct event *ev)
141 return (sigaction(EVENT_SIGNAL(ev),(struct sigaction *)SIG_DFL, NULL));
145 evsignal_handler(int sig)
147 int save_errno = errno;
149 if(evsignal_base == NULL) {
151 "%s: received signal %s, but have no base configured",
156 evsignal_base->sig.evsigcaught[sig]++;
157 evsignal_base->sig.evsignal_caught = 1;
159 /* Wake up our notification mechanism */
160 write(evsignal_base->sig.ev_signal_pair[0], "a", 1);
165 evsignal_process(struct event_base *base)
170 base->sig.evsignal_caught = 0;
171 TAILQ_FOREACH(ev, &base->sig.signalqueue, ev_signal_next) {
172 ncalls = base->sig.evsigcaught[EVENT_SIGNAL(ev)];
174 if (!(ev->ev_events & EV_PERSIST))
176 event_active(ev, EV_SIGNAL, ncalls);
177 base->sig.evsigcaught[EVENT_SIGNAL(ev)] = 0;
183 evsignal_dealloc(struct event_base *base)
185 if(base->sig.ev_signal_added) {
186 event_del(&base->sig.ev_signal);
187 base->sig.ev_signal_added = 0;
189 assert(TAILQ_EMPTY(&base->sig.signalqueue));
191 close(base->sig.ev_signal_pair[0]);
192 base->sig.ev_signal_pair[0] = -1;
193 close(base->sig.ev_signal_pair[1]);
194 base->sig.ev_signal_pair[1] = -1;