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/* Report a SIGPIPE signal and exit.
Copyright (C) 2008-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
#include <config.h>
/* Specification. */
#include "sigpipe-die.h"
#include <signal.h>
#include <stdlib.h>
#include "error.h"
#include "exitfail.h"
#include "gettext.h"
#define _(msgid) gettext (msgid)
void
sigpipe_die (void)
{
error (exit_failure, 0, "%s",
_("error writing to a closed pipe or socket"));
/* Ensure that this function really does not return. */
abort ();
}
static void (*prepare_die_hook) (void);
/* This is the signal handler for SIGPIPE. It is invoked synchronously,
therefore it can make library calls to malloc(), gettext(), exit() etc. -
although in general it is undefined behaviour to do such calls from
within signal handlers. */
static void
sigpipe_die_handler (int sig)
{
if (prepare_die_hook != NULL)
(*prepare_die_hook) ();
sigpipe_die ();
}
void
install_sigpipe_die_handler (void (*prepare_die) (void))
{
prepare_die_hook = prepare_die;
/* Install the handler. */
{
struct sigaction action;
action.sa_handler = sigpipe_die_handler;
action.sa_flags = 0;
sigemptyset (&action.sa_mask);
if (sigaction (SIGPIPE, &action, NULL) >= 0)
{
/* Unblock the signal (just in case). This is needed because if the
signal was blocked in the parent process, it is also blocked in
this process: the mask of blocked signals is inherited across
fork/exec (except for SIGCHLD). */
sigset_t sigpipe_set;
sigemptyset (&sigpipe_set);
sigaddset (&sigpipe_set, SIGPIPE);
sigprocmask (SIG_UNBLOCK, &sigpipe_set, NULL);
}
}
}
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