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The
routine sets the process’s file mode creation mask to and returns the
previous value of the mask. The 9 low-order access permission bits of are
used by system calls, including and to turn off corresponding bits
requested in file mode. (See This clearing allows each user to restrict
the default access to his files. The default mask value is S_IWGRP|S_IWOTH
(022, write access for the owner only). Child processes inherit the mask
of the calling process.
The previous value of the file mode
mask is returned by the call.
The function is always successful.
The function call is expected to conform to
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