READLINKAT
Section: Linux Programmer's Manual (2)
Updated: 2009-12-13
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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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Time: 07:34:53 GMT, March 26, 2013