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HP-UX 11i Version 3: February 2007

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mkfifo — make FIFO (named pipe) special files


mkfifo [-p] [-m mode] filename ...


mkfifo creates the FIFO special files named by its operand list. The operands are taken sequentially in the order specified and, if the user has write permission in the appropriate directory, the FIFO is created with permissions 0666 modified by the user's file mode creation mask (see umask(2)).

The specific actions performed are equivalent to calling

mkfifo(filename, 0666)

for each filename in the operand list (see mkfifo(3C)).


mkfifo recognizes the following command-line options:

-m mode

After creating the FIFO special file, set the permission bits of the new file to the specified mode value. The mode option argument is a symbolic mode string as defined in chmod(1).

In the symbolic mode strings, the operators + and - will be interpreted relative to an initial mode of a=rw.


Create any missing intermediate path name components.


For information about the UNIX standard environment, see standards(5).

Environment Variables

LANG determines the locale to use for the locale categories when both LC_ALL and the corresponding environment variable (beginning with LC_) do not specify a locale. If LANG is not specified or is set to the empty string, a default of "C" (see lang(5)) is used.

LC_ALL determines the locale to use to override any values for locale categories specified by the settings of LANG or any environment variables beginning with LC_.

LC_CTYPE determines the locale for the interpretation of sequences of bytes of text data as characters (e.g., single- versus multibyte characters in arguments).

If any internationalization variable contains an invalid setting, mkfifo behaves as if all internationalization variables are set to "C". See environ(5).

International Code Set Support

Single-byte character code sets are supported.


mkfifo returns zero if invoked with at least one operand and if all FIFO special files were created successfully. Otherwise, it prints a diagnostic message and returns non-zero.


The following command creates a FIFO special file named peacepipe in the current directory:

mkfifo peacepipe


mkfifo: XPG3, XPG4, POSIX.2

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