umask(2) -- Linux man page
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 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)
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