release/src/router/apcupsd/src/lib/apcsignal.c

   1 /*
   2  * apcsignal.c
   3  *
   4  * signal() managing functions
   5  */
   6
   7 /*
   8  * Copyright (C) 1999-2000 Riccardo Facchetti <riccardo@master.oasi.gpa.it>
   9  * Copyright (C) 1996-99 Andre M. Hedrick <andre@suse.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of version 2 of the GNU General
  13  * Public License as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the Free
  22  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  23  * MA 02111-1307, USA.
  24  */
  25
  26 #include "apc.h"
  27
  28 #ifndef HAVE_MINGW
  29 static void *terminate(void *arg)
  30 {
  31    // Create signal set containing SIGHUP, SIGINT, and SIGTERM
  32    sigset_t sigset;
  33    sigemptyset(&sigset);
  34    sigaddset(&sigset, SIGHUP);
  35    sigaddset(&sigset, SIGINT);
  36    sigaddset(&sigset, SIGTERM);
  37
  38    // Wait for signal delivery
  39    int signum, err;
  40    do
  41    {
  42       err = sigwait(&sigset, &signum);
  43    }
  44    while(err == EINTR);
  45
  46    // Caught a signal; invoke handler
  47    void (*handler) (int) = (void (*) (int))arg;
  48    handler(signum);
  49    return NULL;
  50 }
  51 #endif
  52
  53 void init_signals(void (*handler) (int))
  54 {
  55 #ifndef HAVE_MINGW
  56    // Block SIGPIPE and termination signals
  57    sigset_t sigset;
  58    sigemptyset(&sigset);
  59    sigaddset(&sigset, SIGPIPE); // Don't care
  60    sigaddset(&sigset, SIGHUP);  // Will be handled by terminate thread
  61    sigaddset(&sigset, SIGINT);  // Will be handled by terminate thread
  62    sigaddset(&sigset, SIGTERM); // Will be handled by terminate thread
  63    pthread_sigmask(SIG_BLOCK, &sigset, NULL);
  64
  65    // Launch thread to synchronously wait for termination signals
  66    pthread_t tid;
  67    pthread_create(&tid, NULL, terminate, (void*)handler);
  68 #endif
  69 }