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tests: support stderr verification with returns_() * tests/init.sh (returns_): Disable tracing for this wrapper function, so that stderr of the wrapped command is unchanged, allowing for verification of the contents.
author Pádraig Brady <P@draigBrady.com>
date Mon, 16 Feb 2015 17:20:39 +0000
parents ab58d4870664
children
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1 /* POSIX compatible signal blocking for threads.
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2 Copyright (C) 2011-2015 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include <signal.h>
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21
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22 #include <errno.h>
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23 #include <stddef.h>
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24
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25 #if PTHREAD_SIGMASK_INEFFECTIVE
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26 # include <string.h>
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27 #endif
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28
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29 #if PTHREAD_SIGMASK_UNBLOCK_BUG
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30 # include <unistd.h>
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31 #endif
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32
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33 int
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34 pthread_sigmask (int how, const sigset_t *new_mask, sigset_t *old_mask)
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35 #undef pthread_sigmask
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36 {
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37 #if HAVE_PTHREAD_SIGMASK
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38 int ret;
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39
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40 # if PTHREAD_SIGMASK_INEFFECTIVE
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41 sigset_t omask, omask_copy;
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42 sigset_t *old_mask_ptr = &omask;
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43 sigemptyset (&omask);
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44 /* Add a signal unlikely to be blocked, so that OMASK_COPY
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45 is unlikely to match the actual mask. */
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46 sigaddset (&omask, SIGILL);
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47 memcpy (&omask_copy, &omask, sizeof omask);
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48 # else
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49 sigset_t *old_mask_ptr = old_mask;
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50 # endif
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51
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52 ret = pthread_sigmask (how, new_mask, old_mask_ptr);
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53
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54 # if PTHREAD_SIGMASK_INEFFECTIVE
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55 if (ret == 0)
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56 {
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57 /* Detect whether pthread_sigmask is currently ineffective.
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58 Don't cache the information: libpthread.so could be dynamically
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59 loaded after the program started and after pthread_sigmask was
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60 called for the first time. */
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61 if (memcmp (&omask_copy, &omask, sizeof omask) == 0
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62 && pthread_sigmask (1729, &omask_copy, NULL) == 0)
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63 {
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64 /* pthread_sigmask is currently ineffective. The program is not
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65 linked to -lpthread. So use sigprocmask instead. */
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66 return (sigprocmask (how, new_mask, old_mask) < 0 ? errno : 0);
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67 }
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68
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69 if (old_mask)
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70 memcpy (old_mask, &omask, sizeof omask);
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71 }
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72 # endif
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73 # if PTHREAD_SIGMASK_FAILS_WITH_ERRNO
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74 if (ret == -1)
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75 return errno;
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76 # endif
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77 # if PTHREAD_SIGMASK_UNBLOCK_BUG
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78 if (ret == 0
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79 && new_mask != NULL
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80 && (how == SIG_UNBLOCK || how == SIG_SETMASK))
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81 {
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82 /* Give the OS the opportunity to raise signals that were pending before
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83 the pthread_sigmask call and have now been unblocked. */
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84 usleep (1);
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85 }
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86 # endif
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87 return ret;
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88 #else
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89 int ret = sigprocmask (how, new_mask, old_mask);
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90 return (ret < 0 ? errno : 0);
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91 #endif
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92 }