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authorIndrajith K L2022-12-03 17:00:20 +0530
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+mkfifo(P) 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:
+
+ The file operand is used as the path argument.
+
+ 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.)
+
+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 op-
+ erand defined for the chmod utility. In the sym-
+ bolic_mode strings, the op characters '+' and '-'
+ shall be interpreted relative to an assumed ini-
+ tial mode of a= rw.
+
+
+OPERANDS
+ The following operand shall be supported:
+
+ file A pathname of the FIFO special file to be cre-
+ ated.
+
+
+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 internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ 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 mes-
+ sages 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 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 Sys-
+ tem Interfaces volume of IEEE Std 1003.1-2001. For exam-
+ ple, 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 Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute 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.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 mkfifo(P)