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PROLOG | NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | STDIN | INPUT FILES | ENVIRONMENT VARIABLES | ASYNCHRONOUS EVENTS | STDOUT | STDERR | OUTPUT FILES | EXTENDED DESCRIPTION | EXIT STATUS | CONSEQUENCES OF ERRORS | APPLICATION USAGE | EXAMPLES | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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MKFIFO(1P) POSIX Programmer's Manual MKFIFO(1P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
mkfifo — make FIFO special files
mkfifo [−m mode] file...
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 POSIX.1‐2008, 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 permissions less restrictive than the −m mode option-
argument.)
The mkfifo utility shall conform to the Base Definitions volume of
POSIX.1‐2008, 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.
The following operand shall be supported:
file A pathname of the FIFO special file to be created.
Not used.
None.
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 POSIX.1‐2008, Section 8.2, Internationalization
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 internationalization 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 arguments).
LC_MESSAGES
Determine the locale that should be used to affect the
format and contents of diagnostic messages written to
standard error.
NLSPATH Determine the location of message catalogs for the
processing of LC_MESSAGES.
Default.
Not used.
The standard error shall be used only for diagnostic messages.
None.
None.
The following exit values shall be returned:
0 All the specified FIFO special files were created successfully.
>0 An error occurred.
Default.
The following sections are informative.
None.
None.
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 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 utilities.
The functionality of mkfifo is described substantially through a
reference to the mkfifo() function in the System Interfaces volume of
POSIX.1‐2008. 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.
None.
chmod(1p), umask(1p)
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables, Section 12.2, Utility Syntax Guidelines
The System Interfaces volume of POSIX.1‐2008, mkfifo(3p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 MKFIFO(1P)
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