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161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
/*
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* OpenMODBUS/TCP to RS-232/485 MODBUS RTU gateway
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*
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* sig.c - signals management procedures
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*
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* Copyright (c) 2002-2003, 2013, Victor Antonovich (v.antonovich@gmail.com)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: sig.c,v 1.3 2015/02/25 10:33:57 kapyar Exp $
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*/
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#include "sig.h"
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#include "tty.h"
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/* signal flag */
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volatile sig_atomic_t sig_flag = 0;
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/* internal prototypes */
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void sig_bus(int signum);
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void sig_segv(int signum);
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void sig_handler(int signum);
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/*
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* Signal handler initialization
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* Return: none
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*/
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void
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sig_init(void)
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{
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struct sigaction sa;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGSEGV);
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sigaddset(&sa.sa_mask, SIGBUS);
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sigaddset(&sa.sa_mask, SIGTERM);
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sigaddset(&sa.sa_mask, SIGHUP);
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sigaddset(&sa.sa_mask, SIGINT);
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sigaddset(&sa.sa_mask, SIGPIPE);
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sigaddset(&sa.sa_mask, SIGCHLD);
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sigaddset(&sa.sa_mask, SIGALRM);
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sigaddset(&sa.sa_mask, SIGUSR1);
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sigaddset(&sa.sa_mask, SIGUSR2);
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sa.sa_handler = sig_segv;
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sigaction(SIGSEGV, &sa, NULL);
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sa.sa_handler = sig_bus;
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sigaction(SIGBUS, &sa, NULL);
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sa.sa_handler = sig_handler;
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sigaction(SIGTERM, &sa, NULL);
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sa.sa_handler = sig_handler;
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sigaction(SIGHUP, &sa, NULL);
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sa.sa_handler = sig_handler;
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sigaction(SIGINT, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGPIPE, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGCHLD, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGALRM, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGUSR1, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGUSR2, &sa, NULL);
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}
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/*
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* SIGSEGV signal handler
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*/
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void
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sig_segv(int signum)
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{
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#ifndef SAFESIG
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signum = signum; /* prevent compiler warning */
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fprintf(stderr, "caught SIGSEGV, dumping core...");
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fclose(stderr);
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#endif
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abort();
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}
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/*
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* SIGBUS signal handler
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*/
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void
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sig_bus(int signum)
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{
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#ifndef SAFESIG
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signum = signum; /* prevent compiler warning */
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fprintf(stderr, "caught SIGBUS, dumping core...");
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fclose(stderr);
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#endif
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abort();
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}
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/*
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* Unignored signals handler
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*/
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void
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sig_handler(int signum)
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{
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#ifndef SAFESIG
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tty_sighup();
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#endif
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sig_flag = signum;
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}
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/*
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* Signal action execution
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*/
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void
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sig_exec(void)
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{
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#ifdef LOG
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static char *signames[] = {
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"", "HUP", "INT", "QUIT", "ILL", "TRAP", "IOT", "BUS", "FPE",
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"KILL", "USR1", "SEGV", "USR2", "PIPE", "ALRM", "TERM" };
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logw(2, "Terminated by signal: SIG%s", signames[sig_flag]);
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#endif
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/* currently simply exit the program */
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switch(sig_flag)
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{
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case SIGINT:
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case SIGTERM: // fall-through
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exit(0);
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default:
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exit(1);
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}
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}
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