#define _GNU_SOURCE /* See feature_test_macros(7) */
This function returns the current file creation mask. It is equivalent
mode_t mask = umask( 0 );
except that it is documented to be thread-safe (that is, shares a lock
with the umask(2) library call).
This is a vaporware GNU extension.
This function is documented but not implemented yet in glibc, as at
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GNU 2010-09-10 GETUMASK(3)
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