Re: mingw and SIGPIPE, new modules 'sigpipe' and 'write' (4/7)

[Bruno Haible]

2008-09-26  Bruno Haible  <address@hidden>

        * modules/sigpipe-tests: New file.
        * tests/test-sigpipe.c: New file.
        * tests/test-sigpipe.sh: New file.

=========================== modules/sigpipe-tests ==========================
Files:
tests/test-sigpipe.c
tests/test-sigpipe.sh

Depends-on:
write

configure.ac:

Makefile.am:
TESTS += test-sigpipe.sh
TESTS_ENVIRONMENT += EXEEXT='@EXEEXT@' srcdir='$(srcdir)'
check_PROGRAMS += test-sigpipe

=========================== tests/test-sigpipe.sh ==========================
#!/bin/sh

tmpfiles=""
trap 'rm -fr $tmpfiles' 1 2 3 15

# Test signal's default behaviour.
tmpfiles="$tmpfiles t-sigpipeA.tmp"
./test-sigpipe${EXEEXT} A 2> t-sigpipeA.tmp | head -1 > /dev/null
if test -s t-sigpipeA.tmp; then
  LC_ALL=C tr -d '\r' < t-sigpipeA.tmp
  rm -fr $tmpfiles; exit 1
fi

# Test signal's ignored behaviour.
tmpfiles="$tmpfiles t-sigpipeB.tmp"
./test-sigpipe${EXEEXT} B 2> t-sigpipeB.tmp | head -1 > /dev/null
if test -s t-sigpipeB.tmp; then
  LC_ALL=C tr -d '\r' < t-sigpipeB.tmp
  rm -fr $tmpfiles; exit 1
fi

# Test signal's behaviour when a handler is installed.
tmpfiles="$tmpfiles t-sigpipeC.tmp"
./test-sigpipe${EXEEXT} B 2> t-sigpipeC.tmp | head -1 > /dev/null
if test -s t-sigpipeC.tmp; then
  LC_ALL=C tr -d '\r' < t-sigpipeC.tmp
  rm -fr $tmpfiles; exit 1
fi

rm -fr $tmpfiles
exit 0
=========================== tests/test-sigpipe.c ===========================
/* Test of SIGPIPE handling.
   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, 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, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#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>

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);
            }
        }
    }
}