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NAME

       readlinkat - read value of a symbolic link relative to a directory file
       descriptor

SYNOPSIS

       #include <fcntl.h> /* Definition of AT_* constants */
       #include <unistd.h>

       int readlinkat(int dirfd, const char *pathname,
                      char *buf, size_t bufsiz);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       readlinkat():
           Since glibc 2.10:
               _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _ATFILE_SOURCE

DESCRIPTION

       The readlinkat() system call  operates  in  exactly  the  same  way  as
       readlink(2), 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 readlink(2) 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 readlink(2)).

       If pathname is absolute, then dirfd is ignored.

RETURN VALUE

       On success, readlinkat() returns the number of bytes placed in buf.  On
       error, -1 is returned and errno is set to indicate the error.

ERRORS

       The  same  errors  that  occur  for  readlink(2)  can  also  occur  for
       readlinkat().   The  following  additional   errors   can   occur   for
       readlinkat():

       EBADF  dirfd is not a valid file descriptor.

       ENOTDIR
              pathname is relative and dirfd is a file descriptor referring to
              a file other than a directory.

VERSIONS

       readlinkat() was added to Linux in kernel 2.6.16.

CONFORMING TO

       POSIX.1-2008.

NOTES

       See openat(2) for an explanation of the need for readlinkat().

SEE ALSO

       openat(2), readlink(2), 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/.