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READLINKAT(2)              Linux Programmer's Manual             READLINKAT(2)



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

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

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

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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-08-21                     READLINKAT(2)