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

NAME
       mkfifoat	 -  make  a  FIFO  (named  pipe)  relative to a directory file
       descriptor

SYNOPSIS
       #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
       The mkfifoat()  system  call  operates  in  exactly  the	 same  way  as
       mkfifo(3), except for the differences described in this manual page.

       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(3) 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(3)).

       If pathname is absolute, then dirfd is ignored.

RETURN VALUE
       On success, mkfifoat() returns 0.  On error, -1 is returned  and	 errno
       is set to indicate the error.

ERRORS
       The same errors that occur for mkfifo(3) can also occur for mkfifoat().
       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
	      referring to a file other than a directory.

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

CONFORMING TO
       POSIX.1-2008.

NOTES
       See openat(2) for an explanation of the need for mkfifoat().

SEE ALSO
       openat(2), mkfifo(3), path_resolution(7)

COLOPHON
       This page is part of release 3.54 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2009-12-13			   MKFIFOAT(3)
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