READLINKAT(2) Linux Programmer's Manual READLINKAT(2)NAMEreadlinkat - read value of a symbolic link relative to a directory file
descriptor
SYNOPSIS
#include <unistd.h>
int readlinkat(int dirfd, const char *path, char *buf, size_t bufsiz);
DESCRIPTION
The readlinkat() system call operates in exactly the same way as read‐
link(2), except for the differences described in this manual page.
If the pathname given in path is relative, then it is interpreted rela‐
tive 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 the pathname given in path is relative and dirfd is the special
value AT_FDCWD, then path is interpreted relative to the current work‐
ing directory of the calling process (like readlink(2)).
If the pathname given in path is absolute, then dirfd is ignored.
RETURN VALUE
On success, readlinkat() returns 0. 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 read‐
linkat(). The following additional errors can occur for readlinkat():
EBADF dirfd is not a valid file descriptor.
ENOTDIR
path is a relative path and dirfd is a file descriptor referring
to a file other than a directory.
NOTES
See openat(2) for an explanation of the need for readlinkat().
CONFORMING TO
This system call is non-standard but is proposed for inclusion in a
future revision of POSIX.1.
VERSIONSreadlinkat() was added to Linux in kernel 2.6.16.
SEE ALSOopenat(2), path_resolution(2), readlink(2)Linux 2.6.16 2006-07-21 READLINKAT(2)
