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mkfifoat - make a FIFO (named pipe) relative to a directory file descriptor
#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
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. ENOTDIR 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)
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