UMASK(2)                   Linux Programmer's Manual                  UMASK(2)



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 per-
       missions  0666  &  ~022  = 0644 = rw-r--r-- in the usual case where the
       mode is specified 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)



Linux                             1998-08-09                          UMASK(2)