* syscalls.cc (_write): Allow zero length as per SUSv2.

winsup/cygwin/ChangeLog

@@ -1,3 +1,7 @@
+2001-11-13  Christopher Faylor  <cgf@redhat.com>
+
+	* syscalls.cc (_write): Allow zero length as per SUSv2.
+
 2001-11-13  Corinna Vinschen  <corinna@vinschen.de>
 
 	* dir.cc (mkdir): Add HIDDEN file attribute if file has leading dot

winsup/cygwin/syscalls.cc

@@ -355,6 +355,9 @@ _read (int fd, void *ptr, size_t len)
 extern "C" ssize_t
 _write (int fd, const void *ptr, size_t len)
 {
+  if (len == 0)
+    return 0;
+
   if (__check_invalid_read_ptr_errno (ptr, len))
     return -1;