mkfifo - Makes FIFO special files
mkfifo [-m mode] file...
The mkfifo utility creates FIFO special files in the order specified.
Interfaces documented on this reference page conform to industry standards
Refer to the standards(5) reference page for more information about indus-
try standards and associated tags.
Sets the file permission bits of the new file to the specified mode
value, after creating the FIFO special file. The mode argument is a
symbolic mode string (see chmod), in which the operator characters +
(plus sign) and - (minus) are interpreted relative to the default file
mode for that file type. The + character adds permissions to the
default mode, and - deletes permissions from the default mode.
[Tru64 UNIX] The default mode is a=rw (permissions of rw-rw-rw) as
modified by the current file mode creation mask (umask).
The path name of a FIFO special file to be created.
For each file argument, mkfifo performs actions equivalent to the mkfifo()
call with the following arguments:
1. The file argument is used as the pathname argument.
2. If the -m option is not used, 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.
The mkfifo utility exits with one of the following values:
0 Indicates that all the specified FIFO special files were created
>>0 Indicates that an error occurred.
1. To create a FIFO special file with permissions prw-r--r--, enter:
mkfifo -m 644 /tmp/myfifo
The command creates the /tmp/myfifo file with read/write permissions
for the owner and read permission for the group and for others.
2. To create a FIFO special file using the - (minus) operand to set per-
missions of prw-r-----, enter:
mkfifo -m g-w,o-rw /tmp/fifo2
The command creates the /tmp/fifo2 file, removing write permission for
the group and all permissions for others.
The following environment variables affect the execution of mkfifo:
Provides a default value for the internationalization variables that
are unset or null. If LANG is unset or null, the corresponding value
from the default locale is used. If any of the internationalization
variables contain an invalid setting, the utility behaves as if none of
the variables had been defined.
If set to a non-empty string value, overrides the values of all the
other internationalization variables.
Determines 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).
Determines the locale for the format and contents of diagnostic mes-
sages written to standard error.
Determines the location of message catalogues for the processing of
Commands: mkdir(1), mknod(8)
Functions: chmod(2), mkdir(2), mkfifo(3), mknod(2), umask(2)