diff options
author | Bruno Haible <bruno@clisp.org> | 2008-08-31 16:11:47 +0200 |
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committer | Bruno Haible <bruno@clisp.org> | 2008-08-31 16:11:47 +0200 |
commit | ab01b091793316d28722ad1d7e6b869d6ec3911b (patch) | |
tree | 70a55c2a47b10feee439ebd8a92345cc9abe440c /lib/sigpipe-die.c | |
parent | e1165b4980e126d20d256666e05a6523e52d3796 (diff) | |
download | gnulib-ab01b091793316d28722ad1d7e6b869d6ec3911b.tar.gz |
New module 'sigpipe-die'.
Diffstat (limited to 'lib/sigpipe-die.c')
-rw-r--r-- | lib/sigpipe-die.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/sigpipe-die.c b/lib/sigpipe-die.c new file mode 100644 index 0000000000..bb3c8b00e6 --- /dev/null +++ b/lib/sigpipe-die.c @@ -0,0 +1,82 @@ +/* Report a SIGPIPE signal and exit. + Copyright (C) 2008 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 <http://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); + } + } +} |