readlink(2) System Calls Manual readlink(2)
readlink - read value of a symbolic link
cc = readlink(path, buf, bufsiz)
char *path, *buf;
The system call places the contents of the symbolic link path in the buffer buf, which has size bufsiz. The contents of the link are not
null terminated when returned.
The call returns the count of characters placed in the buffer if it succeeds, or a -1 if an error occurs, placing the error code in the
global variable errno.
The system call fails under the following conditions:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire pathname exceeded 1023 characters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied on a component of the path prefix.
[EINVAL] The named file is not a symbolic link.
[EFAULT] The buf extends outside the process's allocated address space.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EIO] An I/O error occurred while reading from the file system.
[ETIMEDOUT] A connect request or remote file operation failed, because the connected party did not properly respond after a period of
time that is dependent on the communications protocol.
lstat(2), symlink(2), stat(2)