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 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.)
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:
The following operand shall be supported:
Not used.
None.
The following environment variables shall affect the execution of mkfifo:
Default.
Not used.
The standard error shall be used only for diagnostic messages.
None.
None.
The following exit values shall be returned:
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 IEEE Std 1003.1-2001. 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() , umask() , the System Interfaces volume of IEEE Std 1003.1-2001, mkfifo()