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| author | Michael Santos <[email protected]> | 2010-04-30 12:22:11 -0400 |
|---|---|---|
| committer | Raimo Niskanen <[email protected]> | 2010-06-04 10:47:56 +0200 |
| commit | 4bd026cccb2c22279dd9c88e704642c5a65d3c53 (patch) | |
| tree | 5c801bf9813b575eb302039f78b07b50364b6696 /erts/emulator/drivers/win32 | |
| parent | cbd1378ee1fde835e55614bac9290b281bafe49a (diff) | |
| download | otp-4bd026cccb2c22279dd9c88e704642c5a65d3c53.tar.gz otp-4bd026cccb2c22279dd9c88e704642c5a65d3c53.tar.bz2 otp-4bd026cccb2c22279dd9c88e704642c5a65d3c53.zip | |
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.c | 3 |
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); |