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UMASK(2) BSD System Calls Manual UMASK(2)
umask -- set file creation mode mask
The umask() routine sets the process's file mode creation mask to numask and returns the
previous value of the mask. The 9 low-order access permission bits of numask are used by
system calls, including open(2), mkdir(2), mkfifo(2) and mknod(2) to turn off corresponding
bits requested in file mode. (See chmod(2)). 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 umask() function is always successful.
chmod(2), mkdir(2), mkfifo(2), mknod(2), open(2)
The umask() function call is expected to conform to IEEE Std 1003.1-1988 (``POSIX.1'').
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
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