From 82e12143f97fbe9ce09f137004e3118fb745f28e Mon Sep 17 00:00:00 2001
From: Albert Cheng <acheng@hdfgroup.org>
Date: Mon, 20 Aug 2001 13:36:58 -0500
Subject: [svn-r4396] Purpose:     bug fix Description:     H5FD_mpio_flush()
 would try to file seek negative if the     file->eoa is 0 (e.g., doing mpio
 on the raw-file of the     split file driver).  Put in a code to catch this
 case     by returning succeed immediately. Platforms tested:     modi4(pp)

---
 src/H5FDmpio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/H5FDmpio.c b/src/H5FDmpio.c
index ab1fbd8..15cc6b8 100644
--- a/src/H5FDmpio.c
+++ b/src/H5FDmpio.c
@@ -1542,6 +1542,9 @@ H5FD_mpio_flush(H5FD_t *_file)
      * Unfortunately, keeping track of EOF is an expensive operation, so
      * we can't just check whether EOF<EOA like with other drivers.
      * Therefore we'll just read the byte at EOA-1 and then write it back. */
+    /* But if eoa is zero, then nothing to flush.  Just return */
+    if (file->eoa == 0)
+	HRETURN(SUCCEED);
     if (haddr_to_MPIOff(file->eoa-1, &mpi_off)<0) {
         HRETURN_ERROR(H5E_INTERNAL, H5E_BADRANGE, FAIL,
                       "cannot convert from haddr_t to MPI_Offset");
-- 
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