Linux 2.6 - man page for mkfifoat (linux section 3)
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MKFIFOAT(3) Linux Programmer's Manual MKFIFOAT(3)
mkfifoat - make a FIFO (named pipe) relative to a directory file descriptor
#include <fcntl.h> /* Definition of AT_* constants */
int mkfifoat(int dirfd, const char *pathname, mode_t mode);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
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 path-
If pathname is relative and dirfd is the special value AT_FDCWD, then pathname is inter-
preted relative to the current working directory of the calling process (like mkfifo(3)).
If pathname is absolute, then dirfd is ignored.
On success, mkfifoat() returns 0. On error, -1 is returned and errno is set to indicate
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.
pathname is a relative path and dirfd is a file descriptor referring to a file
other than a directory.
mkfifoat() was added to glibc in version 2.4. It is implemented using mknod(2), available
on Linux since kernel 2.6.16.
See openat(2) for an explanation of the need for mkfifoat().
openat(2), mkfifo(3), path_resolution(7)
This page is part of release 3.55 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
Linux 2009-12-13 MKFIFOAT(3)
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