umask(2)                            CLIX                            umask(2)



  NAME

    umask - Sets and gets the value of the file mode creation mask

  LIBRARY

    Standard C Library (libc.a)

  SYNOPSIS

    #include <sys/types.h>

    #include <sys/stat.h>

    mode_t umask(
      mode_t cmask );

  PARAMETERS

    cmask   Specifies the value of the file mode creation mask.

  DESCRIPTION

    The umask() function sets the file mode creation mask of the process to
    the value of cmask and returns the previous value of the mask.  The cmask
    parameter is constructed by a logical OR of the file permission bits
    defined in the <sys/stat.h> header file.

    Whenever a file is created (by the open(), mkdir(), mknod(), or mkfifo()
    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.

  EXAMPLES

    To prevent users other than the owner from writing any files created by
    the current process:

    (void)umask(S_IWGRP | S_IWOTH);


  RETURN VALUES

    Upon successful completion, the previous value of the file mode creation
    mask is returned.

  ERRORS

    This function never sets errno.

  RELATED INFORMATION



  2/94 - Intergraph Corporation                                              1

  umask(2)                            CLIX                            umask(2)



    Commands:  sh(1), umask(1)

    Functions:  chmod(2), mknod(2), open(2), stat(2)



















































  2                                              Intergraph Corporation - 2/94