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mkfifo(3C)							    mkfifo(3C)

NAME
       mkfifo() - make a FIFO file

SYNOPSIS
DESCRIPTION
       creates a new FIFO (first-in-first-out) file, at the path name to which
       path points.  The file permission bits of the new file are  initialized
       from  the  mode	argument,  as  modified by the process's file creation
       mask: for each bit set in the process's file mode  creation  mask,  the
       corresponding  bit  in  the  new file's mode is cleared (see umask(2)).
       Bits in mode other than the file permission bits are ignored.

       The FIFO owner ID is set to the process's effective-user-ID.  The  FIFO
       group  ID  is  set  to the group ID of the parent directory if the set-
       group-ID bit is set on that directory.  Otherwise the FIFO group ID  is
       set to the process's effective group ID.

       For details of the I/O behavior of pipes see read(2) and write(2).

       The  following symbolic constants are defined in the header, and should
       be used to construct the value of the mode argument.  The value	passed
       should be the bitwise inclusive OR of the desired permissions:

	      Read by owner.
	      Write by owner.
	      Read by group.
	      Write by group.
	      Read by other users.
	      Write by other users.

RETURN VALUE
       returns	0  upon	 successful  completion.  Otherwise, it returns -1, no
       FIFO is created, and is set to indicate the error.

ERRORS
       fails and the new file is not created if any of	the  following	condi‐
       tions are encountered:

	      [EACCES]	     A component of the path prefix denies search per‐
			     mission.

	      [EEXIST]	     The named file already exists.

	      [EFAULT]	     The path argument points  outside	the  process's
			     allocated	address space.	The reliable detection
			     of this error is implementation dependent.

	      [ELOOP]	     Too many symbolic links encountered in  translat‐
			     ing the path name.

	      [ENAMETOOLONG] The  length  of  the  specified path name exceeds
			     bytes, or the length of a component of  the  path
			     name exceeds bytes while is in effect.

	      [ENOENT]	     A component of the path prefix does not exist.

	      [ENOENT]	     The path argument is null.

	      [ENOSPC]	     Not enough space on the file system.

	      [ENOTDIR]	     A	component  of  the path prefix is not a direc‐
			     tory.

	      [EROFS]	     The directory in which the file is being  created
			     is located in a read-only file system.

AUTHOR
       was developed by HP.

SEE ALSO
       chmod(2),  mknod(2),  pipe(2),  stat(2),	 umask(2),  mknod(5), stat(5),
       thread_safety(5), types(5).

STANDARDS CONFORMANCE
								    mkfifo(3C)

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