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NAME
       umask - set file mode creation mask


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

       mode_t umask(mode_t mask);


DESCRIPTION
       umask()  sets  the calling process’s file mode creation mask (umask) to
       mask & 0777.

       The umask is used by open(2), mkdir(2), and  other  system  calls  that
       create files to modify the permissions placed on newly created files or
       directories.  Specifically, permissions in the  umask  are  turned  off
       from  the  mode  argument to open(2) and mkdir(2) (so, for example, the
       common umask default value of 022 results in new  files  being  created
       with permissions 0666 & ~022 = 0644 = rw-r--r-- in the usual case where
       the mode is specified to open(2) as 0666).


RETURN VALUE
       This system call always succeeds and the previous value of the mask  is
       returned.


CONFORMING TO
       SVr4, SVID, POSIX, X/OPEN, 4.3BSD


SEE ALSO
       chmod(2), mkdir(2), open(2)