root/maint/gnulib/tests/test-sigaction.c

/* */

DEFINITIONS

1. handler
2. main

   1 /* Test of sigaction() function.
   2    Copyright (C) 2008-2021 Free Software Foundation, Inc.
   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
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16 
  17 /* Written by Eric Blake <ebb9@byu.net>, 2008.  */
  18 
  19 #include <config.h>
  20 
  21 #include <signal.h>
  22 
  23 #include "signature.h"
  24 SIGNATURE_CHECK (sigaction, int, (int, struct sigaction const *,
  25                                   struct sigaction *));
  26 
  27 #include <stddef.h>
  28 
  29 #include "macros.h"
  30 
  31 #ifndef SA_NOCLDSTOP
  32 # define SA_NOCLDSTOP 0
  33 #endif
  34 #ifndef SA_ONSTACK
  35 # define SA_ONSTACK 0
  36 #endif
  37 #ifndef SA_RESETHAND
  38 # define SA_RESETHAND 0
  39 #endif
  40 #ifndef SA_RESTART
  41 # define SA_RESTART 0
  42 #endif
  43 #ifndef SA_SIGINFO
  44 # define SA_SIGINFO 0
  45 #endif
  46 #ifndef SA_NOCLDWAIT
  47 # define SA_NOCLDWAIT 0
  48 #endif
  49 
  50 /* Define a mask of flags required by POSIX.  Some implementations
  51    provide other flags as extensions, such as SA_RESTORER, that we
  52    must ignore in this test.  */
  53 #define MASK_SA_FLAGS (SA_NOCLDSTOP | SA_ONSTACK | SA_RESETHAND | SA_RESTART \
  54                        | SA_SIGINFO | SA_NOCLDWAIT | SA_NODEFER)
  55 
  56 /* This test is unsafe in the presence of an asynchronous SIGABRT,
  57    because we install a signal-handler that is intentionally not
  58    async-safe.  Hopefully, this does not lead to too many reports of
  59    false failures, since people don't generally use 'kill -s SIGABRT'
  60    to end a runaway program.  */
  61 
  62 static void
  63 handler (int sig)
     /*  */
  64 {
  65   static int entry_count;
  66   struct sigaction sa;
  67   ASSERT (sig == SIGABRT);
  68   ASSERT (sigaction (SIGABRT, NULL, &sa) == 0);
  69   ASSERT ((sa.sa_flags & SA_SIGINFO) == 0);
  70   switch (entry_count++)
  71     {
  72     case 0:
  73       ASSERT ((sa.sa_flags & SA_RESETHAND) == 0);
  74       ASSERT (sa.sa_handler == handler);
  75       break;
  76     case 1:
  77       /* This assertion fails on glibc-2.3.6 systems with LinuxThreads,
  78          when this program is linked with -lpthread, due to the sigaction()
  79          override in libpthread.so.  */
  80 #if !(defined __GLIBC__ || defined __UCLIBC__)
  81       ASSERT (sa.sa_handler == SIG_DFL);
  82 #endif
  83       break;
  84     default:
  85       ASSERT (0);
  86     }
  87 }
  88 
  89 int
  90 main (void)
     /*  */
  91 {
  92   struct sigaction sa;
  93   struct sigaction old_sa;
  94   sa.sa_handler = handler;
  95 
  96   sa.sa_flags = 0;
  97   ASSERT (sigemptyset (&sa.sa_mask) == 0);
  98   ASSERT (sigaction (SIGABRT, &sa, NULL) == 0);
  99   ASSERT (raise (SIGABRT) == 0);
 100 
 101   sa.sa_flags = SA_RESETHAND | SA_NODEFER;
 102   ASSERT (sigaction (SIGABRT, &sa, &old_sa) == 0);
 103   ASSERT ((old_sa.sa_flags & MASK_SA_FLAGS) == 0);
 104   ASSERT (old_sa.sa_handler == handler);
 105   ASSERT (raise (SIGABRT) == 0);
 106 
 107   sa.sa_handler = SIG_DFL;
 108   ASSERT (sigaction (SIGABRT, &sa, &old_sa) == 0);
 109   ASSERT ((old_sa.sa_flags & SA_SIGINFO) == 0);
 110 #if !(defined __GLIBC__ || defined __UCLIBC__) /* see above */
 111   ASSERT (old_sa.sa_handler == SIG_DFL);
 112 #endif
 113 
 114   sa.sa_handler = SIG_IGN;
 115   ASSERT (sigaction (SIGABRT, &sa, NULL) == 0);
 116   ASSERT (raise (SIGABRT) == 0);
 117   ASSERT (sigaction (SIGABRT, NULL, &old_sa) == 0);
 118   ASSERT (old_sa.sa_handler == SIG_IGN);
 119   ASSERT (raise (SIGABRT) == 0);
 120 
 121   return 0;
 122 }

/* */