From 5b20c4155c91d134ab15772765bb3d06f1a8b6a9 Mon Sep 17 00:00:00 2001
From: Tim Griesbach <tim.griesbach@uni-bonn.de>
Date: Fri, 31 May 2024 14:34:46 +0200
Subject: [PATCH] Revert "CI: Modify open mode"

This reverts commit 51fcaffb24b4a26e7c988d6d59f703fe138cc0aa.
---
 .github/workflows/ci_cmake.yml | 2 +-
 src/p4est.c                    | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci_cmake.yml b/.github/workflows/ci_cmake.yml
index 598b5d0ed..02d5a5e2d 100644
--- a/.github/workflows/ci_cmake.yml
+++ b/.github/workflows/ci_cmake.yml
@@ -27,7 +27,7 @@ jobs:
   linux-gcc14:
     runs-on: ubuntu-24.04
     name: Linux mpi=${{ matrix.mpi }} CC=${{ matrix.cc }} shared=${{ matrix.shared }}
-    timeout-minutes: 61
+    timeout-minutes: 60
 
     strategy:
       matrix:
diff --git a/src/p4est.c b/src/p4est.c
index 2d94fa38b..14e9c5b13 100644
--- a/src/p4est.c
+++ b/src/p4est.c
@@ -3602,7 +3602,8 @@ p4est_save_ext (const char *filename, p4est_t * p4est,
   SC_CHECK_MPI (mpiret);
   printf ("rank %d before MPI_file_open\n", p4est->mpirank);
   mpiret = MPI_File_open (p4est->mpicomm, (char *) filename,
-                          MPI_MODE_WRONLY | MPI_MODE_APPEND, MPI_INFO_NULL, &mpifile);
+                          MPI_MODE_WRONLY | MPI_MODE_APPEND |
+                          MPI_MODE_UNIQUE_OPEN, MPI_INFO_NULL, &mpifile);
   SC_CHECK_MPI (mpiret);
   printf ("rank %d after MPI_file_open\n", p4est->mpirank);
   mpiret = MPI_File_get_position (mpifile, &mpipos);