umask(2)                                                           umask(2)

NAME
     umask - set and get file mode creation mask

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

     modet umask(modet cmask);

DESCRIPTION
     umask() sets the process' file mode creation mask to cmask and returns
     the previous value of the mask. Only the access permission bits of
     cmask and the file mode creation mask are used.

     The process' file mode creation mask is used during open(), creat(),
     mkdir() and mkfifo() functions to turn off permission bits in the mode
     argument. Bit positions that are set in cmask are cleared in the mode
     of the created file.

RESULT
     The file permission bits in the value returned by umask() will be the
     previous value of the file creation mask. The state of any other bits
     in that mask is unspecified. A subsequent call to umask() with the
     return value of the first call as argument will leave the state of the
     mask the same as its state before the first call, including any
     unspecified use of bits.

SEE ALSO
     mkdir(1), sh(1), chmod(2), creat(2), mknod(2), open(2), stat(5).


























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