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OSX 10.6.2 - man page for readlink (osx section 2)

READLINK(2)						      BSD System Calls Manual						       READLINK(2)

readlink -- read value of a symbolic link
#include <unistd.h> ssize_t readlink(const char *restrict path, char *restrict buf, size_t bufsize);
Readlink() places the contents of the symbolic link path in the buffer buf, which has size bufsize. Readlink does not append a NUL character to buf.
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.
Readlink() will fail if: [EACCES] Search permission is denied for a component of the path prefix. [EFAULT] Buf extends outside the process's allocated address space. [EINVAL] The named file is not a symbolic link. [EIO] An I/O error occurred while reading from the file system. [ELOOP] Too many symbolic links are encountered in translating the pathname. This is taken to be indicative of a looping symbolic link. [ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name (possibly expanded by a symbolic link) exceeded {PATH_MAX} characters. [ENOENT] The named file does not exist. [ENOTDIR] A component of the path prefix is not a directory.
#include <unistd.h> int readlink(const char *path, char *buf, int bufsize); The function type and the type of bufsize have changed.
lstat(2), stat(2), symlink(2), compat(5), symlink(7)
The readlink() function call appeared in 4.2BSD. 4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution