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File Permission Constants
One of these constants is required when _O_CREAT (_open, _sopen) is specified.
The pmode argument specifies the file's permission settings as follows.
|_S_IREAD | _S_IWRITE||Reading and writing permitted|
When used as the pmode argument for _umask, the manifest constant sets the permission setting, as follows.
|_S_IREAD||Writing not permitted (file is read-only)|
|_S_IWRITE||Reading not permitted (file is write-only)|
|_S_IREAD | _S_IWRITE||Neither reading nor writing permitted|