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MKFIFO(1P)                 POSIX Programmer's Manual                MKFIFO(1P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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 unspeci-
           fied, but the FIFO shall at no time have permissions 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, Internationalization Variables for the prece-
              dence 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 internationalization variables.

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

       LC_MESSAGES
              Determine the locale that should be used to affect the format and contents of diagnostic messages  writ-
              ten 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 functionality provided by
       the mkdir utility.

       Early proposals included a -p option similar to the mkdir -p option that created intermediate directories lead-
       ing  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 utilities.

       The functionality of mkfifo is described substantially through a reference to the mkfifo() function in the Sys-
       tem  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, Stan-
       dard 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 original Standard
       can be obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                           MKFIFO(1P)