MKFIFO

The function "mkfifo" can be used to create a named pipe from within a program. The signature of the function is as follows:

int mkfifo(const char *path, mode_t mode)

The mkfifo function takes the path of the file and the mode (permissions) with which the file should be created. It creates the new named pipe file as specified by the path.
The function call assumes the O_CREATE|O_EXCL flags, that is, it creates a new named pipe or returns an error of EEXIST if the named pipe already exists. The named pipe's owner ID is set to the process' effective user ID, and its group ID is set to the process' effective group ID, or if the S_ISGID bit is set in the parent directory, the group ID of the named pipe is inherited from the parent directory.