NAME
umask —
set file creation mode mask
SYNOPSIS
#include
<sys/stat.h>
mode_t
umask(mode_t cmask);
DESCRIPTION
The
umask()
routine sets the process's file mode creation mask to
cmask and returns the previous value of the mask. The
9 low-order access permission bits of cmask 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.
RETURN VALUES
The previous value of the file mode mask is returned by the call.
ERRORS
The umask() function is always
successful.
LEGACY SYNOPSIS
#include
<sys/types.h> #include
<sys/stat.h>
The include file
<sys/types.h> is
necessary.
SEE ALSO
STANDARDS
The umask() function call is expected to
conform to IEEE Std 1003.1-1988
(“POSIX.1”).