kc3-lang/gnulib/tests/test-sigpipe.c

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• Hash : 2cdc1baf
  Author :
  Date : 2020-01-01T00:00:18
  

  maint: Run 'make update-copyright'
  

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• tests/test-sigpipe.c

• /* Test of SIGPIPE handling.
     Copyright (C) 2008-2020 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, 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/>.  */
  
  #include <config.h>
  
  #include <signal.h>
  
  /* Check that SIGPIPE is defined.  */
  int s = SIGPIPE;
  
  #include <errno.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  #include "macros.h"
  
  static void
  handler (int sig)
  {
    exit (0);
  }
  
  int
  main (int argc, char **argv)
  {
    char mode = argv[1][0];
  
    switch (mode)
      {
      case 'A': signal (SIGPIPE, SIG_DFL); break;
      case 'B': signal (SIGPIPE, SIG_IGN); break;
      case 'C': signal (SIGPIPE, handler); break;
      }
  
    /* Produce infinite output.  Since it is piped into "head -1", the writes
       must ultimately fail.  */
    for (;;)
      {
        char c[2] = { 'y', '\n' };
        int ret = write (1, c, sizeof (c));
        if (ret <= 0)
          {
            switch (mode)
              {
              case 'B': /* The write() call should have failed with EPIPE.  */
                if (ret < 0 && errno == EPIPE)
                  exit (0);
                FALLTHROUGH;
              case 'A': /* The process should silently die.  */
              case 'C': /* The handler should have been called.  */
                fprintf (stderr, "write() returned %d with error %d.\n", ret, errno);
                exit (1);
              }
          }
      }
  }
  

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