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#define _GNU_SOURCE
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "signals.h"
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#include "common.h"
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struct signals {
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struct event_base *ev_base;
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struct signal {
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struct event *ev;
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} sig_list[MAX_SIGNALS];
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int sig_count;
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};
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void signals_loopexit (int signal, short event, void *arg) {
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struct signals *signals = arg;
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INFO("[signal] caught %s: exiting the event loop", strsignal(signal));
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if (event_base_loopexit(signals->ev_base, NULL))
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FATAL("event_base_loopexit");
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}
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void signals_ignore (int signal, short event, void *arg) {
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struct signals *signals = arg;
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(void) signals;
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/* ignore */
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}
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struct signals *signals_alloc (struct event_base *ev_base) {
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struct signals *signals = NULL;
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if ((signals = calloc(1, sizeof(*signals))) == NULL)
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ERROR("calloc");
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// simple attributes
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signals->ev_base = ev_base;
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// done
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return signals;
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error:
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return NULL;
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}
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int signals_add (struct signals *signals, int sigval, void (*sig_handler)(evutil_socket_t, short, void *)) {
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struct signal *sig_info;
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// find our sig_info
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assert(signals->sig_count < MAX_SIGNALS);
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sig_info = &signals->sig_list[signals->sig_count++];
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// set up the libevent signal events
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if ((sig_info->ev = signal_new(signals->ev_base, sigval, sig_handler, signals)) == NULL)
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PERROR("signal_new");
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if (signal_add(sig_info->ev, NULL))
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PERROR("signal_add");
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// success
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return 0;
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error:
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return -1;
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}
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struct signals *signals_default (struct event_base *ev_base) {
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struct signals *signals = NULL;
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// alloc signals
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if ((signals = signals_alloc(ev_base)) == NULL)
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return NULL;
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// add the set of default signals
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if ( signals_add(signals, SIGPIPE, &signals_ignore)
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|| signals_add(signals, SIGINT, &signals_loopexit)
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) ERROR("signals_add");
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// success
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return signals;
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error:
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if (signals)
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signals_free(signals);
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return NULL;
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}
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void signals_free (struct signals *signals) {
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int i;
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// free all events
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for (i = 0; i < signals->sig_count; i++) {
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if (signal_del(signals->sig_list[i].ev))
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PWARNING("signal_del");
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}
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// free the info itself
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free(signals);
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}
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