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 3.25 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)