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authorMichael Santos <[email protected]>2010-04-30 12:22:11 -0400
committerRaimo Niskanen <[email protected]>2010-06-04 10:47:56 +0200
commit4bd026cccb2c22279dd9c88e704642c5a65d3c53 (patch)
tree5c801bf9813b575eb302039f78b07b50364b6696 /erts/emulator/drivers/common
parentcbd1378ee1fde835e55614bac9290b281bafe49a (diff)
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Support opening files in exclusive mode
Add an option that atomically tests for the existence of a file and creates it if the file does not exist, by passing the O_EXCL flag to open() on Unix and CREATE_NEW flag on Windows. Support for O_EXCL varies across platforms and filesystems. {ok, Fd} = file:open("/tmp/foo", [write,exclusive]), {error, eexist} = file:open("/tmp/foo", [write,exclusive]).
Diffstat (limited to 'erts/emulator/drivers/common')
-rw-r--r--erts/emulator/drivers/common/erl_efile.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/erts/emulator/drivers/common/erl_efile.h b/erts/emulator/drivers/common/erl_efile.h
index bbc973d58b..ac95c1f949 100644
--- a/erts/emulator/drivers/common/erl_efile.h
+++ b/erts/emulator/drivers/common/erl_efile.h
@@ -32,7 +32,8 @@
#define EFILE_MODE_READ_WRITE 3
#define EFILE_MODE_APPEND 4
#define EFILE_COMPRESSED 8
-#define EFILE_NO_TRUNCATE 16 /* Special for reopening on VxWorks */
+#define EFILE_MODE_EXCL 16
+#define EFILE_NO_TRUNCATE 32 /* Special for reopening on VxWorks */
/*
* Seek modes for efile_seek().