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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/win32
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/win32')
-rw-r--r--erts/emulator/drivers/win32/win_efile.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/erts/emulator/drivers/win32/win_efile.c b/erts/emulator/drivers/win32/win_efile.c
index 24b6fb30dc..04bd1139f5 100644
--- a/erts/emulator/drivers/win32/win_efile.c
+++ b/erts/emulator/drivers/win32/win_efile.c
@@ -689,6 +689,9 @@ Sint64* pSize; /* Where to store the size of the file. */
if (flags & EFILE_MODE_APPEND) {
crFlags = OPEN_ALWAYS;
}
+ if (flags & EFILE_MODE_EXCL) {
+ crFlags = CREATE_NEW;
+ }
fd = CreateFile(name, access,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL, crFlags, FILE_ATTRIBUTE_NORMAL, NULL);