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MKFIFO(3)		   Linux Programmer's Manual		     MKFIFO(3)

NAME
       mkfifo, mkfifoat	- 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);

       #include	<fcntl.h>	    /* Definition of AT_* constants */
       #include	<sys/stat.h>

       int mkfifoat(int	dirfd, const char *pathname, mode_t mode);

   Feature Test	Macro Requirements for glibc (see feature_test_macros(7)):

       mkfifoat():
	   Since glibc 2.10:
	       _XOPEN_SOURCE >=	700 || _POSIX_C_SOURCE >= 200809L
	   Before glibc	2.10:
	       _ATFILE_SOURCE

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 filesystem 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 nonblocking  handling  of
       FIFO special files.

   mkfifoat()
       The  mkfifoat()	function operates in exactly the same way as mkfifo(),
       except for the differences described here.

       If the pathname given in	pathname is relative, then it  is  interpreted
       relative	 to  the  directory  referred  to by the file descriptor dirfd
       (rather than relative to	the current working directory of  the  calling
       process,	as is done by mkfifo() for a relative pathname).

       If  pathname  is	relative and dirfd is the special value	AT_FDCWD, then
       pathname	is interpreted relative	to the current	working	 directory  of
       the calling process (like mkfifo()).

       If pathname is absolute,	then dirfd is ignored.

RETURN VALUE
       On  success mkfifo() and	mkfifoat() return 0.  In the case of an	error,
       -1 is returned (in which	case, errno is set appropriately).

ERRORS
       EACCES One of the directories in	pathname did not  allow	 search	 (exe-
	      cute) permission.

       EDQUOT The  user's quota	of disk	blocks or inodes on the	filesystem has
	      been exhausted.

       EEXIST pathname already exists.	This includes the case where  pathname
	      is a symbolic link, dangling or not.

       ENAMETOOLONG
	      Either the total length of pathname is greater than PATH_MAX, or
	      an individual filename  component	 has  a	 length	 greater  than
	      NAME_MAX.	 In the	GNU system, there is no	imposed	limit on over-
	      all filename length, but some filesystems	may  place  limits  on
	      the length of a component.

       ENOENT A	 directory  component  in pathname does	not exist or is	a dan-
	      gling symbolic link.

       ENOSPC The directory or filesystem has no room for the new file.

       ENOTDIR
	      A	component used as a directory in pathname is not, in  fact,  a
	      directory.

       EROFS  pathname refers to a read-only filesystem.

       The following additional	errors can occur for mkfifoat():

       EBADF  dirfd is not a valid file	descriptor.

       ENOTDIR
	      pathname	is  a relative path and	dirfd is a file	descriptor re-
	      ferring to a file	other than a directory.

VERSIONS
       mkfifoat() was added to glibc in	version	2.4.  It is implemented	 using
       mknodat(2), available on	Linux since kernel 2.6.16.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The mkfifo() and	mkfifoat() functions are thread-safe.

CONFORMING TO
       mkfifo(): POSIX.1-2001, POSIX.1-2008.

       mkfifoat(): POSIX.1-2008.

SEE ALSO
       mkfifo(1),  close(2),  open(2),	read(2),  stat(2), umask(2), write(2),
       fifo(7)

COLOPHON
       This page is part of release 3.74 of the	Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       http://www.kernel.org/doc/man-pages/.

GNU				  2014-03-24			     MKFIFO(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON

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