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

NAME
       mkfifo - make FIFO special files

SYNOPSIS
       mkfifo [-m mode] file...

DESCRIPTION
       The  mkfifo  utility shall create the FIFO special files specified by the operands, in the
       order specified.

       For each file operand, the mkfifo utility shall perform actions equivalent to the mkfifo()
       function  defined in the System Interfaces volume of IEEE Std 1003.1-2001, called with the
       following arguments:

	1. The file operand is used as the path argument.

	2. The value of the bitwise-inclusive OR of S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP,  S_IROTH,
	   and S_IWOTH is used as the mode argument. (If the -m option is specified, the value of
	   the mkfifo() mode argument is unspecified, but the FIFO shall at no time have  permis-
	   sions less restrictive than the -m mode option-argument.)

OPTIONS
       The  mkfifo  utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001,
       Section 12.2, Utility Syntax Guidelines.

       The following option shall be supported:

       -m  mode
	      Set the file permission bits of the newly-created FIFO to the specified mode value.
	      The  mode  option-argument  shall  be  the same as the mode operand defined for the
	      chmod utility. In the symbolic_mode strings, the op characters '+' and '-' shall be
	      interpreted relative to an assumed initial mode of a= rw.

OPERANDS
       The following operand shall be supported:

       file   A pathname of the FIFO special file to be created.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of mkfifo:

       LANG   Provide  a  default  value for the internationalization variables that are unset or
	      null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Inter-
	      nationalization Variables for the precedence of internationalization variables used
	      to determine the values of locale categories.)

       LC_ALL If set to a non-empty string value, override the values of all the  other  interna-
	      tionalization variables.

       LC_CTYPE
	      Determine  the  locale for the interpretation of sequences of bytes of text data as
	      characters (for example, single-byte as opposed to multi-byte characters	in  argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic messages written to standard error.

       NLSPATH
	      Determine the location of message catalogs for the processing of LC_MESSAGES .

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       Not used.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0     All the specified FIFO special files were created successfully.

       >0     An error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       None.

EXAMPLES
       None.

RATIONALE
       This utility was added to permit shell applications to create FIFO special files.

       The -m option was added to control the file mode, for consistency with the  similar  func-
       tionality provided by the mkdir utility.

       Early  proposals included a -p option similar to the mkdir -p option that created interme-
       diate directories leading up to the FIFO  specified  by	the  final  component.	This  was
       removed	because  it is not commonly needed and is not common practice with similar utili-
       ties.

       The functionality of mkfifo is described substantially through a reference to the mkfifo()
       function in the System Interfaces volume of IEEE Std 1003.1-2001. For example, by default,
       the mode of the FIFO file is affected by the file mode creation mask  in  accordance  with
       the specified behavior of the mkfifo() function. In this way, there is less duplication of
       effort required for describing details of the file creation.

FUTURE DIRECTIONS
       None.

SEE ALSO
       chmod() , umask() , the System Interfaces volume of IEEE Std 1003.1-2001, mkfifo()

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					MKFIFO(P)
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