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MKFIFO(3)                  Linux Programmer’s Manual                 MKFIFO(3)
 
NAME
       mkfifo - make a FIFO special file (a named pipe)
 
SYNOPSIS
       #include <sys/types.h>
       #include <sys/stat.h>
 
       int mkfifo(const char *pathname, mode_t mode);
 
DESCRIPTION
       mkfifo()  makes a FIFO special file with name pathname.  mode specifies
       the FIFO’s permissions.  It is modified by the process’s umask  in  the
       usual way: the permissions of the created file are (mode & ~umask).
 
       A  FIFO special file is similar to a pipe, except that it is created in
       a different way.  Instead of being an anonymous communications channel,
       a  FIFO  special  file  is  entered  into  the  file  system by calling
       mkfifo().
 
       Once you have created a FIFO special file in this way, any process  can
       open  it  for  reading or writing, in the same way as an ordinary file.
       However, it has to be open at both ends simultaneously before  you  can
       proceed to do any input or output operations on it.  Opening a FIFO for
       reading normally blocks until some other process opens  the  same  FIFO
       for  writing, and vice versa.  See fifo(7) for non-blocking handling of
       FIFO special files.