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According to OSPF, an autonomous system boundary router is a router that is connected by using more than one routing protocol and that exchanges routing information with routers autonomous systems.
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readlink(2) [osx man page]

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

NAME
readlink -- read value of a symbolic link SYNOPSIS
#include <unistd.h> ssize_t readlink(const char *restrict path, char *restrict buf, size_t bufsize); DESCRIPTION
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. RETURN VALUES
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. ERRORS
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. LEGACY SYNOPSIS
#include <unistd.h> int readlink(const char *path, char *buf, int bufsize); The function type and the type of bufsize have changed. SEE ALSO
lstat(2), stat(2), symlink(2), compat(5), symlink(7) HISTORY
The readlink() function call appeared in 4.2BSD. 4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution

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

NAME
readlink - read value of a symbolic link SYNOPSIS
#include <unistd.h> int readlink(const char *path, char *buf, size_t bufsiz); DESCRIPTION
readlink places the contents of the symbolic link path in the buffer buf, which has size bufsiz. readlink does not append a NUL character to buf. It will truncate the contents (to a length of bufsiz characters), in case the buffer is too small to hold all of the contents. RETURN VALUE
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 errno. ERRORS
ENOTDIR A component of the path prefix is not a directory. EINVAL bufsiz is not positive. ENAMETOOLONG A pathname, or a component of a pathname, was too long. ENOENT The named file does not exist. EACCES Search permission is denied for a component of the path prefix. ELOOP Too many symbolic links were encountered in translating the pathname. EINVAL The named file is not a symbolic link. EIO An I/O error occurred while reading from the file system. EFAULT buf extends outside the process's allocated address space. ENOMEM Insufficient kernel memory was available. CONFORMING TO
X/OPEN, 4.4BSD (the readlink function call appeared in 4.2BSD). SEE ALSO
stat(2), lstat(2), symlink(2) Linux 2.0.30 1997-08-21 READLINK(2)

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