2010-06-24 Joel Sherrill <joel.sherrilL@OARcorp.com>

	* libcsupport/src/read.c, libcsupport/src/write.c: read(2) and write(2)
	should return 0 when passed a count of 0 after verifying other
	possible errors.

3 files changed, 12 insertions, 2 deletions

diff --git a/cpukit/ChangeLog b/cpukit/ChangeLog
index c368d7101b..db4f81cb0e 100644
--- a/cpukit/ChangeLog
+++ b/cpukit/ChangeLog
@@ -1,5 +1,11 @@
 2010-06-24	Joel Sherrill <joel.sherrilL@OARcorp.com>
 
+	* libcsupport/src/read.c, libcsupport/src/write.c: read(2) and write(2)
+	should return 0 when passed a count of 0 after verifying other
+	possible errors.
+
+2010-06-24	Joel Sherrill <joel.sherrilL@OARcorp.com>
+
 	* libfs/src/imfs/imfs_creat.c: Fix warning.
 
 2010-06-24	Joel Sherrill <joel.sherrilL@OARcorp.com>
diff --git a/cpukit/libcsupport/src/read.c b/cpukit/libcsupport/src/read.c
index 4e44eec4ff..34d07085b6 100644
--- a/cpukit/libcsupport/src/read.c
+++ b/cpukit/libcsupport/src/read.c
@@ -34,10 +34,12 @@ ssize_t read(
   rtems_libio_check_count( count );
   rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );
 
+  if ( count == 0 )
+    return 0;
+
   /*
    *  Now process the read().
    */
-
   if ( !iop->handlers->read_h )
     rtems_set_errno_and_return_minus_one( ENOTSUP );
 
diff --git a/cpukit/libcsupport/src/write.c b/cpukit/libcsupport/src/write.c
index 3bda204015..0193466bd5 100644
--- a/cpukit/libcsupport/src/write.c
+++ b/cpukit/libcsupport/src/write.c
@@ -41,10 +41,12 @@ ssize_t write(
   rtems_libio_check_count( count );
   rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );
 
+  if ( count == 0 )
+    return 0;
+
   /*
    *  Now process the write() request.
    */
-
   if ( !iop->handlers->write_h )
     rtems_set_errno_and_return_minus_one( ENOTSUP );