Mercurial > gnulib
annotate lib/sigpipe-die.c @ 40186:8964917f9574
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| author | Karl Berry <karl@freefriends.org> |
|---|---|
| date | Mon, 18 Feb 2019 08:02:49 -0800 |
| parents | b06060465f09 |
| children |
| rev | line source |
|---|---|
| 10382 | 1 /* Report a SIGPIPE signal and exit. |
|
40057
b06060465f09
maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
parents:
19484
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changeset
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2 Copyright (C) 2008-2019 Free Software Foundation, Inc. |
| 10382 | 3 |
| 4 This program is free software: you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 3 of the License, or | |
| 7 (at your option) any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 19190 | 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 10382 | 16 |
| 17 /* Written by Bruno Haible <bruno@clisp.org>, 2008. */ | |
| 18 | |
| 19 #include <config.h> | |
| 20 | |
| 21 /* Specification. */ | |
| 22 #include "sigpipe-die.h" | |
| 23 | |
| 24 #include <signal.h> | |
| 25 #include <stdlib.h> | |
| 26 | |
| 27 #include "error.h" | |
| 28 #include "exitfail.h" | |
| 29 | |
| 30 #include "gettext.h" | |
| 31 #define _(msgid) gettext (msgid) | |
| 32 | |
| 33 void | |
| 34 sigpipe_die (void) | |
| 35 { | |
| 36 error (exit_failure, 0, "%s", | |
|
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Bruno Haible <bruno@clisp.org>
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37 _("error writing to a closed pipe or socket")); |
| 10382 | 38 |
| 39 /* Ensure that this function really does not return. */ | |
| 40 abort (); | |
| 41 } | |
| 42 | |
| 43 static void (*prepare_die_hook) (void); | |
| 44 | |
| 45 /* This is the signal handler for SIGPIPE. It is invoked synchronously, | |
| 46 therefore it can make library calls to malloc(), gettext(), exit() etc. - | |
| 47 although in general it is undefined behaviour to do such calls from | |
| 48 within signal handlers. */ | |
| 49 static void | |
| 50 sigpipe_die_handler (int sig) | |
| 51 { | |
| 52 if (prepare_die_hook != NULL) | |
| 53 (*prepare_die_hook) (); | |
| 54 sigpipe_die (); | |
| 55 } | |
| 56 | |
| 57 void | |
| 58 install_sigpipe_die_handler (void (*prepare_die) (void)) | |
| 59 { | |
| 60 prepare_die_hook = prepare_die; | |
| 61 | |
| 62 /* Install the handler. */ | |
| 63 { | |
| 64 struct sigaction action; | |
| 65 | |
| 66 action.sa_handler = sigpipe_die_handler; | |
| 67 action.sa_flags = 0; | |
| 68 sigemptyset (&action.sa_mask); | |
| 69 if (sigaction (SIGPIPE, &action, NULL) >= 0) | |
| 70 { | |
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Bruno Haible <bruno@clisp.org>
parents:
10382
diff
changeset
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71 /* Unblock the signal (just in case). This is needed because if the |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
10382
diff
changeset
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72 signal was blocked in the parent process, it is also blocked in |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
10382
diff
changeset
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73 this process: the mask of blocked signals is inherited across |
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e8d2c6fc33ad
Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
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diff
changeset
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74 fork/exec (except for SIGCHLD). */ |
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Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
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75 sigset_t sigpipe_set; |
| 10382 | 76 |
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Bruno Haible <bruno@clisp.org>
parents:
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77 sigemptyset (&sigpipe_set); |
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Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
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78 sigaddset (&sigpipe_set, SIGPIPE); |
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Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents:
10382
diff
changeset
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79 sigprocmask (SIG_UNBLOCK, &sigpipe_set, NULL); |
| 10382 | 80 } |
| 81 } | |
| 82 } |