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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.1‐2017, 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.1‐2017, 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.1‐2017, 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.1‐2017. 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.1‐2017, Chapter 8,
Environment Variables, Section 12.2, Utility Syntax Guidelines
The System Interfaces volume of POSIX.1‐2017, mkfifo(3p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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 2017 MKFIFO(1P)
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