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Linux 2.6 - man page for umask (linux section 3posix)

UMASK(P)			    POSIX Programmer's Manual				 UMASK(P)

NAME
       umask - set and get the file mode creation mask

SYNOPSIS
       #include <sys/stat.h>

       mode_t umask(mode_t cmask);

DESCRIPTION
       The  umask()  function  shall set the process' file mode creation mask to cmask and return
       the previous value of the mask. Only the file permission bits of cmask (see  <sys/stat.h>)
       are used; the meaning of the other bits is implementation-defined.

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

RETURN VALUE
       The  file  permission bits in the value returned by umask() shall be the previous value of
       the file mode creation mask. The state of any other bits in  that  value  is  unspecified,
       except  that a subsequent call to umask() with the returned value as cmask shall leave the
       state of the mask the same as its state before the first call, including  any  unspecified
       use of those bits.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       Unsigned  argument  and	return	types for umask() were proposed.  The return type and the
       argument were both changed to mode_t.

       Historical implementations have made use of additional bits in cmask for their implementa-
       tion-defined  purposes.	The  addition  of  the text that the meaning of other bits of the
       field is implementation-defined permits these implementations to conform to this volume of
       IEEE Std 1003.1-2001.

FUTURE DIRECTIONS
       None.

SEE ALSO
       creat()	 ,   mkdir()   ,   mkfifo()   ,   open()   ,   the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <sys/stat.h>, <sys/types.h>

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 UMASK(P)


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