New module 'write'.

2 files changed, 77 insertions, 0 deletions

diff --git a/lib/unistd.in.h b/lib/unistd.in.h
index 500de9ce18..e75b4cdae1 100644
--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -35,6 +35,11 @@
 /* mingw fails to declare _exit in <unistd.h>.  */
 #include <stdlib.h>
 
+#if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
+/* Get ssize_t.  */
+# include <sys/types.h>
+#endif
+
 /* The definition of GL_LINK_WARNING is copied here.  */
 
 
@@ -333,6 +338,16 @@ extern unsigned int sleep (unsigned int n);
 #endif
 
 
+#if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
+/* Write up to COUNT bytes starting at BUF to file descriptor FD.
+   See the POSIX:2001 specification
+   <http://www.opengroup.org/susv3xsh/write.html>.  */
+# undef write
+# define write rpl_write
+extern ssize_t write (int fd, const void *buf, size_t count);
+#endif
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/write.c b/lib/write.c
new file mode 100644
index 0000000000..250b5cc8fd
--- /dev/null
+++ b/lib/write.c
@@ -0,0 +1,62 @@
+/* POSIX compatible write() function.
+   Copyright (C) 2008 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2008.
+
+   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 of the License, 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 <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <unistd.h>
+
+/* Replace this function only if module 'sigpipe' is requested.  */
+#if GNULIB_SIGPIPE
+
+/* On native Windows platforms, SIGPIPE does not exist.  When write() is
+   called on a pipe with no readers, WriteFile() fails with error
+   GetLastError() = ERROR_NO_DATA, and write() in consequence fails with
+   error EINVAL.  */
+
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+
+#  include <errno.h>
+#  include <signal.h>
+#  include <io.h>
+
+#  define WIN32_LEAN_AND_MEAN  /* avoid including junk */
+#  include <windows.h>
+
+ssize_t
+rpl_write (int fd, const void *buf, size_t count)
+#undef write
+{
+  ssize_t ret = write (fd, buf, count);
+
+  if (ret < 0)
+    {
+      if (GetLastError () == ERROR_NO_DATA
+	  && GetFileType (_get_osfhandle (fd)) == FILE_TYPE_PIPE)
+	{
+	  /* Try to raise signal SIGPIPE.  */
+	  raise (SIGPIPE);
+	  /* If it is currently blocked or ignored, change errno from EINVAL
+	     to EPIPE.  */
+	  errno = EPIPE;
+	}
+    }
+  return ret;
+}
+
+# endif
+#endif