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