83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/* Report a SIGPIPE signal and exit.
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Copyright (C) 2008-2024 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
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#include <config.h>
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/* Specification. */
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#include "sigpipe-die.h"
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#include <signal.h>
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#include <stdlib.h>
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#include <error.h>
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#include "exitfail.h"
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#include "gettext.h"
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#define _(msgid) gettext (msgid)
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void
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sigpipe_die (void)
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{
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error (exit_failure, 0, "%s",
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_("error writing to a closed pipe or socket"));
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/* Ensure that this function really does not return. */
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abort ();
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}
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static void (*prepare_die_hook) (void);
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/* This is the signal handler for SIGPIPE. It is invoked synchronously,
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therefore it can make library calls to malloc(), gettext(), exit() etc. -
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although in general it is undefined behaviour to do such calls from
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within signal handlers. */
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static void
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sigpipe_die_handler (int sig)
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{
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if (prepare_die_hook != NULL)
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(*prepare_die_hook) ();
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sigpipe_die ();
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}
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void
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install_sigpipe_die_handler (void (*prepare_die) (void))
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{
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prepare_die_hook = prepare_die;
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/* Install the handler. */
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{
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struct sigaction action;
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action.sa_handler = sigpipe_die_handler;
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action.sa_flags = 0;
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sigemptyset (&action.sa_mask);
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if (sigaction (SIGPIPE, &action, NULL) >= 0)
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{
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/* Unblock the signal (just in case). This is needed because if the
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signal was blocked in the parent process, it is also blocked in
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this process: the mask of blocked signals is inherited across
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fork/exec (except for SIGCHLD). */
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sigset_t sigpipe_set;
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sigemptyset (&sigpipe_set);
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sigaddset (&sigpipe_set, SIGPIPE);
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sigprocmask (SIG_UNBLOCK, &sigpipe_set, NULL);
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}
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}
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}
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