UMASK(2)                             SysV                             UMASK(2)



NAME
     umask - set and get file creation mask

SYNOPSIS
     #include <sys/types.h>

     #include <sys/stat.h>

     mode_t umask (cmask)
     mode_t cmask;

DESCRIPTION
     umask sets the process' file mode creation mask to cmask and returns the
     previous value of the mask.  Only the low-order 9 bits of cmask and the
     file mode creation mask are used.

     Whenever a file is created (by the open(2), creat(2), mknod(2), mkdir(2),
     or mkfifo(3) function), all file permission bits set in the file mode
     creation mask are cleared in the mode of the created file. This clearing
     allows users to restrict the default access to their files.

DIAGNOSTICS
     The previous value of the file mode creation mask is returned.

SEE ALSO
     chmod(2), creat(2), mknod(2), open(2).
     mkdir(1), sh(1) in the SysV Command Reference.