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OpenDarwin 7.2.1 - man page for umask (opendarwin section 2)

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UMASK(2)			     BSD System Calls Manual				 UMASK(2)

     umask -- set file creation mode mask

     #include <sys/types.h>
     #include <sys/stat.h>

     umask(mode_t numask);

     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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