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 3.27 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)