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Wrap O_DSYNC in MDB_DSYNC.

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If O_DSYNC is not defined, that may be due to poor compiler options.
We could fall back to the less efficient O_SYNC, but it seems better
to let the user learn of the problem and give better compiler options.
This commit is contained in:
Hallvard B Furuseth 2011-08-19 20:35:25 +02:00 committed by Howard Chu
parent cb7c955220
commit 5b3b522313
1 changed files with 9 additions and 1 deletions
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10
libraries/libmdb/mdb.c
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@ -55,6 +55,14 @@ typedef ULONG pgno_t;
#include "midl.h"
/* Note: If O_DSYNC is undefined but exists in /usr/include,
* preferably set some compiler flag to get the definition.
* Otherwise compile with the less efficient -DMDB_DSYNC=O_SYNC.
*/
#ifndef MDB_DSYNC
# define MDB_DSYNC O_DSYNC
#endif
#ifndef DEBUG
#define DEBUG 1
#endif
@ -1407,7 +1415,7 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
if ((rc = mdb_env_open2(env, flags)) == MDB_SUCCESS) {
/* synchronous fd for meta writes */
if (!(flags & (MDB_RDONLY|MDB_NOSYNC)))
oflags |= O_DSYNC;
oflags |= MDB_DSYNC;
if ((env->me_mfd = open(dpath, oflags, mode)) == -1) {
rc = errno;
goto leave;