Replace most uses of assert by ovs_assert.

[sliver-openvswitch.git] / ovsdb / log.c

diff --git a/ovsdb/log.c b/ovsdb/log.c
index ab4a150..440e8d0 100644 (file)
--- a/ovsdb/log.c
+++ b/ovsdb/log.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2009, 2010, 2011 Nicira, Inc.
+/* Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,7 +17,6 @@
 
 #include "log.h"
 
-#include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
@@ -75,12 +74,12 @@ ovsdb_log_open(const char *name, enum ovsdb_log_open_mode open_mode,
 
     *filep = NULL;
 
-    assert(locking == -1 || locking == false || locking == true);
+    ovs_assert(locking == -1 || locking == false || locking == true);
     if (locking < 0) {
         locking = open_mode != OVSDB_LOG_READ_ONLY;
     }
     if (locking) {
-        int retval = lockfile_lock(name, 0, &lockfile);
+        int retval = lockfile_lock(name, &lockfile);
         if (retval) {
             error = ovsdb_io_error(retval, "%s: failed to lock lockfile",
                                    name);
@@ -95,7 +94,16 @@ ovsdb_log_open(const char *name, enum ovsdb_log_open_mode open_mode,
     } else if (open_mode == OVSDB_LOG_READ_WRITE) {
         flags = O_RDWR;
     } else if (open_mode == OVSDB_LOG_CREATE) {
-        flags = O_RDWR | O_CREAT | O_EXCL;
+        if (stat(name, &s) == -1 && errno == ENOENT
+            && lstat(name, &s) == 0 && S_ISLNK(s.st_mode)) {
+            /* 'name' is a dangling symlink.  We want to create the file that
+             * the symlink points to, but POSIX says that open() with O_EXCL
+             * must fail with EEXIST if the named file is a symlink.  So, we
+             * have to leave off O_EXCL and accept the race. */
+            flags = O_RDWR | O_CREAT;
+        } else {
+            flags = O_RDWR | O_CREAT | O_EXCL;
+        }
     } else {
         NOT_REACHED();
     }
@@ -309,7 +317,7 @@ error:
 void
 ovsdb_log_unread(struct ovsdb_log *file)
 {
-    assert(file->mode == OVSDB_LOG_READ);
+    ovs_assert(file->mode == OVSDB_LOG_READ);
     file->offset = file->prev_offset;
 }