111 lines
1.9 KiB
C
111 lines
1.9 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 2000,2007 Oracle. All rights reserved.
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*
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* $Id: util_sig.c,v 12.7 2007/05/17 15:14:55 bostic Exp $
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*/
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#include "db_config.h"
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#include "db_int.h"
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static int interrupt;
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static void set_signal __P((int, int));
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static void signal_handler __P((int));
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/*
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* signal_handler --
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* Interrupt signal handler.
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*/
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static void
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signal_handler(signo)
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int signo;
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{
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#ifndef HAVE_SIGACTION
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/* Assume signal() is unreliable and reset it, first thing. */
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set_signal(signo, 0);
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#endif
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/* Some systems don't pass in the correct signal value -- check. */
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if ((interrupt = signo) == 0)
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interrupt = SIGINT;
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}
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/*
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* set_signal
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*/
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static void
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set_signal(s, is_dflt)
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int s, is_dflt;
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{
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/*
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* Use sigaction if it's available, otherwise use signal().
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*/
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#ifdef HAVE_SIGACTION
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struct sigaction sa, osa;
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sa.sa_handler = is_dflt ? SIG_DFL : signal_handler;
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(void)sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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(void)sigaction(s, &sa, &osa);
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#else
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(void)signal(s, is_dflt ? SIG_DFL : signal_handler);
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#endif
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}
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/*
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* __db_util_siginit --
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*
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* PUBLIC: void __db_util_siginit __P((void));
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*/
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void
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__db_util_siginit()
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{
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/*
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* Initialize the set of signals for which we want to clean up.
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* Generally, we try not to leave the shared regions locked if
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* we can.
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*/
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#ifdef SIGHUP
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set_signal(SIGHUP, 0);
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#endif
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#ifdef SIGINT
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set_signal(SIGINT, 0);
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#endif
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#ifdef SIGPIPE
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set_signal(SIGPIPE, 0);
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#endif
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#ifdef SIGTERM
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set_signal(SIGTERM, 0);
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#endif
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}
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/*
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* __db_util_interrupted --
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* Return if interrupted.
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*
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* PUBLIC: int __db_util_interrupted __P((void));
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*/
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int
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__db_util_interrupted()
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{
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return (interrupt != 0);
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}
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/*
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* __db_util_sigresend --
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*
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* PUBLIC: void __db_util_sigresend __P((void));
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*/
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void
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__db_util_sigresend()
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{
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/* Resend any caught signal. */
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if (interrupt != 0) {
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set_signal(interrupt, 1);
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(void)raise(interrupt);
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/* NOTREACHED */
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}
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}
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