NAME

     umask - set file creation mask


SYNOPSIS

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

     mode_t umask(mode_t mask));


DESCRIPTION

     umask sets the umask to mask & 0777.

     The umask is used by open(2) to set initial file permissions
     on  a  newly-created file.  Specifically, permissions in the
     umask are turned off from the mode argument to open(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 speci-
     fied 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, BSD 4.3


SEE ALSO

     creat(2), open(2)