--- a/ChangeLog	Fri Sep 26 13:29:53 2008 +0200
+++ b/ChangeLog	Fri Sep 26 13:31:55 2008 +0200
@@ -23,6 +23,10 @@
 
 2008-09-26  Bruno Haible  <bruno@clisp.org>
 
+	* modules/sigpipe-tests: New file.
+	* tests/test-sigpipe.c: New file.
+	* tests/test-sigpipe.sh: New file.
+
 	* modules/write: New file.
 	* lib/unistd.in.h: Include <sys/types.h>.
 	(write): New declaration.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/sigpipe-tests	Fri Sep 26 13:31:55 2008 +0200
@@ -0,0 +1,14 @@
+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
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-sigpipe.c	Fri Sep 26 13:31:55 2008 +0200
@@ -0,0 +1,69 @@
+/* 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);
+	    }
+	}
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-sigpipe.sh	Fri Sep 26 13:31:55 2008 +0200
@@ -0,0 +1,31 @@
+#!/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