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</div><hr /><div id="sockets.constants" class="appendix">
<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
</p>
<dl>
<dt id="constant.af-unix">
<span class="term">
<strong><code>AF_UNIX</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.af-inet">
<span class="term">
<strong><code>AF_INET</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.af-inet6">
<span class="term">
<strong><code>AF_INET6</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Only available if compiled with IPv6 support.
</span>
</dd>
</dt>
<dt id="constant.sock-stream">
<span class="term">
<strong><code>SOCK_STREAM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.sock-dgram">
<span class="term">
<strong><code>SOCK_DGRAM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.sock-raw">
<span class="term">
<strong><code>SOCK_RAW</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.sock-seqpacket">
<span class="term">
<strong><code>SOCK_SEQPACKET</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.sock-rdm">
<span class="term">
<strong><code>SOCK_RDM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.msg-oob">
<span class="term">
<strong><code>MSG_OOB</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.msg-waitall">
<span class="term">
<strong><code>MSG_WAITALL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.msg-peek">
<span class="term">
<strong><code>MSG_PEEK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.msg-dontroute">
<span class="term">
<strong><code>MSG_DONTROUTE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.msg-eor">
<span class="term">
<strong><code>MSG_EOR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Not available on Windows platforms.
</span>
</dd>
</dt>
<dt id="constant.msg-eof">
<span class="term">
<strong><code>MSG_EOF</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Not available on Windows platforms.
</span>
</dd>
</dt>
<dt id="constant.so-debug">
<span class="term">
<strong><code>SO_DEBUG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-reuseaddr">
<span class="term">
<strong><code>SO_REUSEADDR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-reuseport">
<span class="term">
<strong><code>SO_REUSEPORT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
This constant is only available in PHP 5.4.10 or later on platforms that
support the <strong><code>SO_REUSEPORT</code></strong> socket option: this
includes Mac OS X and FreeBSD, but does not include Linux or Windows.
</span>
</dd>
</dt>
<dt id="constant.so-keepalive">
<span class="term">
<strong><code>SO_KEEPALIVE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-dontroute">
<span class="term">
<strong><code>SO_DONTROUTE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-linger">
<span class="term">
<strong><code>SO_LINGER</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-broadcast">
<span class="term">
<strong><code>SO_BROADCAST</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-oobinline">
<span class="term">
<strong><code>SO_OOBINLINE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-sndbuf">
<span class="term">
<strong><code>SO_SNDBUF</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-rcvbuf">
<span class="term">
<strong><code>SO_RCVBUF</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-sndlowat">
<span class="term">
<strong><code>SO_SNDLOWAT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-rcvlowat">
<span class="term">
<strong><code>SO_RCVLOWAT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-sndtimeo">
<span class="term">
<strong><code>SO_SNDTIMEO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-rcvtimeo">
<span class="term">
<strong><code>SO_RCVTIMEO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-type">
<span class="term">
<strong><code>SO_TYPE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.so-error">
<span class="term">
<strong><code>SO_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.tcp-nodelay">
<span class="term">
<strong><code>TCP_NODELAY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Used to disable Nagle TCP algorithm.
Added in PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.sol-socket">
<span class="term">
<strong><code>SOL_SOCKET</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-normal-read">
<span class="term">
<strong><code>PHP_NORMAL_READ</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-binary-read">
<span class="term">
<strong><code>PHP_BINARY_READ</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.sol-tcp">
<span class="term">
<strong><code>SOL_TCP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.sol-udp">
<span class="term">
<strong><code>SOL_UDP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
</dl>
<p class="simpara">
The following constants are defined under Windows and UNIX-like platforms.
Each constant is only defined if their equal is available on the platform.
</p>
<dl>
<dt id="constant.socket-eintr">
<span class="term">
<strong><code>SOCKET_EINTR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Interrupted system call.
</span>
</dd>
</dt>
<dt id="constant.socket-ebadf">
<span class="term">
<strong><code>SOCKET_EBADF</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Bad file number.
</span>
</dd>
</dt>
<dt id="constant.socket-eacces">
<span class="term">
<strong><code>SOCKET_EACCES</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Permission denied.
</span>
</dd>
</dt>
<dt id="constant.socket-efault">
<span class="term">
<strong><code>SOCKET_EFAULT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Bad address.
</span>
</dd>
</dt>
<dt id="constant.socket-einval">
<span class="term">
<strong><code>SOCKET_EINVAL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Invalid argument.
</span>
</dd>
</dt>
<dt id="constant.socket-emfile">
<span class="term">
<strong><code>SOCKET_EMFILE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Too many open files.
</span>
</dd>
</dt>
<dt id="constant.socket-enametoolong">
<span class="term">
<strong><code>SOCKET_ENAMETOOLONG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
File name too long.
</span>
</dd>
</dt>
<dt id="constant.socket-enotempty">
<span class="term">
<strong><code>SOCKET_ENOTEMPTY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Directory not empty.
</span>
</dd>
</dt>
<dt id="constant.socket-eloop">
<span class="term">
<strong><code>SOCKET_ELOOP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Too many symbolic links encountered.
</span>
</dd>
</dt>
<dt id="constant.socket-ewouldblock">
<span class="term">
<strong><code>SOCKET_EWOULDBLOCK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Operation would block.
</span>
</dd>
</dt>
<dt id="constant.socket-eremote">
<span class="term">
<strong><code>SOCKET_EREMOTE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Object is remote.
</span>
</dd>
</dt>
<dt id="constant.socket-eusers">
<span class="term">
<strong><code>SOCKET_EUSERS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Too many users.
</span>
</dd>
</dt>
<dt id="constant.socket-enotsock">
<span class="term">
<strong><code>SOCKET_ENOTSOCK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Socket operation on non-socket.
</span>
</dd>
</dt>
<dt id="constant.socket-edestaddrreq">
<span class="term">
<strong><code>SOCKET_EDESTADDRREQ</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Destination address required.
</span>
</dd>
</dt>
<dt id="constant.socket-emsgsize">
<span class="term">
<strong><code>SOCKET_EMSGSIZE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Message too long.
</span>
</dd>
</dt>
<dt id="constant.socket-eprototype">
<span class="term">
<strong><code>SOCKET_EPROTOTYPE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Protocol wrong type for socket.
</span>
</dd>
</dt>
<dt id="constant.socket-eprotonosupport">
<span class="term">
<strong><code>SOCKET_EPROTONOSUPPORT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Protocol not supported.
</span>
</dd>
</dt>
<dt id="constant.socket-esocktnosupport">
<span class="term">
<strong><code>SOCKET_ESOCKTNOSUPPORT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Socket type not supported.
</span>
</dd>
</dt>
<dt id="constant.socket-eopnotsupp">
<span class="term">
<strong><code>SOCKET_EOPNOTSUPP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Operation not supported on transport endpoint.
</span>
</dd>
</dt>
<dt id="constant.socket-epfnosupport">
<span class="term">
<strong><code>SOCKET_EPFNOSUPPORT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Protocol family not supported.
</span>
</dd>
</dt>
<dt id="constant.socket-eafnosupport">
<span class="term">
<strong><code>SOCKET_EAFNOSUPPORT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Address family not supported by protocol.
</span>
</dd>
</dt>
<dt id="constant.socket-eaddrnotavail">
<span class="term">
<strong><code>SOCKET_EADDRNOTAVAIL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Cannot assign requested address.
</span>
</dd>
</dt>
<dt id="constant.socket-enetdown">
<span class="term">
<strong><code>SOCKET_ENETDOWN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Network is down.
</span>
</dd>
</dt>
<dt id="constant.socket-enetunreach">
<span class="term">
<strong><code>SOCKET_ENETUNREACH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Network is unreachable.
</span>
</dd>
</dt>
<dt id="constant.socket-enetreset">
<span class="term">
<strong><code>SOCKET_ENETRESET</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Network dropped connection because of reset.
</span>
</dd>
</dt>
<dt id="constant.socket-econnaborted">
<span class="term">
<strong><code>SOCKET_ECONNABORTED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Software caused connection abort.
</span>
</dd>
</dt>
<dt id="constant.socket-econnreset">
<span class="term">
<strong><code>SOCKET_ECONNRESET</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Connection reset by peer.
</span>
</dd>
</dt>
<dt id="constant.socket-enobufs">
<span class="term">
<strong><code>SOCKET_ENOBUFS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No buffer space available.
</span>
</dd>
</dt>
<dt id="constant.socket-eisconn">
<span class="term">
<strong><code>SOCKET_EISCONN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Transport endpoint is already connected.
</span>
</dd>
</dt>
<dt id="constant.socket-enotconn">
<span class="term">
<strong><code>SOCKET_ENOTCONN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Transport endpoint is not connected.
</span>
</dd>
</dt>
<dt id="constant.socket-eshutdown">
<span class="term">
<strong><code>SOCKET_ESHUTDOWN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Cannot send after transport endpoint shutdown.
</span>
</dd>
</dt>
<dt id="constant.socket-etimedout">
<span class="term">
<strong><code>SOCKET_ETIMEDOUT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Connection timed out.
</span>
</dd>
</dt>
<dt id="constant.socket-econnrefused">
<span class="term">
<strong><code>SOCKET_ECONNREFUSED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Connection refused.
</span>
</dd>
</dt>
<dt id="constant.socket-ehostdown">
<span class="term">
<strong><code>SOCKET_EHOSTDOWN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Host is down.
</span>
</dd>
</dt>
<dt id="constant.socket-ehostunreach">
<span class="term">
<strong><code>SOCKET_EHOSTUNREACH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No route to host.
</span>
</dd>
</dt>
<dt id="constant.socket-ealready">
<span class="term">
<strong><code>SOCKET_EALREADY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Operation already in progress.
</span>
</dd>
</dt>
<dt id="constant.socket-einprogress">
<span class="term">
<strong><code>SOCKET_EINPROGRESS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Operation now in progress.
</span>
</dd>
</dt>
</dl>
<p class="simpara">
The following constants are only defined under Windows.
</p>
<dl>
<dt id="constant.socket-enoprotoopt">
<span class="term">
<strong><code>SOCKET_ENOPROTOOPT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-eaddrinuse">
<span class="term">
<strong><code>SOCKET_EADDRINUSE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-etoomyrefs">
<span class="term">
<strong><code>SOCKET_ETOOMYREFS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-eproclim">
<span class="term">
<strong><code>SOCKET_EPROCLIM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-eduot">
<span class="term">
<strong><code>SOCKET_EDUOT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-estale">
<span class="term">
<strong><code>SOCKET_ESTALE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-ediscon">
<span class="term">
<strong><code>SOCKET_EDISCON</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-sysnotready">
<span class="term">
<strong><code>SOCKET_SYSNOTREADY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-vernotsupported">
<span class="term">
<strong><code>SOCKET_VERNOTSUPPORTED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-notinitialised">
<span class="term">
<strong><code>SOCKET_NOTINITIALISED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-host-not-found">
<span class="term">
<strong><code>SOCKET_HOST_NOT_FOUND</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-try-again">
<span class="term">
<strong><code>SOCKET_TRY_AGAIN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-no-recovery">
<span class="term">
<strong><code>SOCKET_NO_RECOVERY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-no-data">
<span class="term">
<strong><code>SOCKET_NO_DATA</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.socket-no-address">
<span class="term">
<strong><code>SOCKET_NO_ADDRESS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
</dl>
<p class="simpara">
The following constants are only available on UNIX-like
platforms. Each constant is only defined if their equal is
available on the platform.
</p>
<dl>
<dt id="constant.socket-eperm">
<span class="term">
<strong><code>SOCKET_EPERM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Operation not permitted.
</span>
</dd>
</dt>
<dt id="constant.socket-enoent">
<span class="term">
<strong><code>SOCKET_ENOENT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No such file or directory.
</span>
</dd>
</dt>
<dt id="constant.socket-eio">
<span class="term">
<strong><code>SOCKET_EIO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
I/O error.
</span>
</dd>
</dt>
<dt id="constant.socket-enxio">
<span class="term">
<strong><code>SOCKET_ENXIO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No such device or address.
</span>
</dd>
</dt>
<dt id="constant.socket-e2big">
<span class="term">
<strong><code>SOCKET_E2BIG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Arg list too long.
</span>
</dd>
</dt>
<dt id="constant.socket-eagain">
<span class="term">
<strong><code>SOCKET_EAGAIN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Try again.
</span>
</dd>
</dt>
<dt id="constant.socket-enomem">
<span class="term">
<strong><code>SOCKET_ENOMEM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Out of memory.
</span>
</dd>
</dt>
<dt id="constant.socket-enotblk">
<span class="term">
<strong><code>SOCKET_ENOTBLK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Block device required.
</span>
</dd>
</dt>
<dt id="constant.socket-ebusy">
<span class="term">
<strong><code>SOCKET_EBUSY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Device or resource busy.
</span>
</dd>
</dt>
<dt id="constant.socket-eexist">
<span class="term">
<strong><code>SOCKET_EEXIST</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
File exists.
</span>
</dd>
</dt>
<dt id="constant.socket-exdev">
<span class="term">
<strong><code>SOCKET_EXDEV</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Cross-device link.
</span>
</dd>
</dt>
<dt id="constant.socket-enodev">
<span class="term">
<strong><code>SOCKET_ENODEV</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No such device.
</span>
</dd>
</dt>
<dt id="constant.socket-enotdir">
<span class="term">
<strong><code>SOCKET_ENOTDIR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Not a directory.
</span>
</dd>
</dt>
<dt id="constant.socket-eisdir">
<span class="term">
<strong><code>SOCKET_EISDIR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Is a directory.
</span>
</dd>
</dt>
<dt id="constant.socket-enfile">
<span class="term">
<strong><code>SOCKET_ENFILE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
File table overflow.
</span>
</dd>
</dt>
<dt id="constant.socket-enotty">
<span class="term">
<strong><code>SOCKET_ENOTTY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Not a typewriter.
</span>
</dd>
</dt>
<dt id="constant.socket-enospc">
<span class="term">
<strong><code>SOCKET_ENOSPC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No space left on device.
</span>
</dd>
</dt>
<dt id="constant.socket-espipe">
<span class="term">
<strong><code>SOCKET_ESPIPE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Illegal seek.
</span>
</dd>
</dt>
<dt id="constant.socket-erofs">
<span class="term">
<strong><code>SOCKET_EROFS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Read-only file system.
</span>
</dd>
</dt>
<dt id="constant.socket-emlink">
<span class="term">
<strong><code>SOCKET_EMLINK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Too many links.
</span>
</dd>
</dt>
<dt id="constant.socket-epipe">
<span class="term">
<strong><code>SOCKET_EPIPE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Broken pipe.
</span>
</dd>
</dt>
<dt id="constant.socket-enolck">
<span class="term">
<strong><code>SOCKET_ENOLCK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No record locks available.
</span>
</dd>
</dt>
<dt id="constant.socket-enosys">
<span class="term">
<strong><code>SOCKET_ENOSYS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Function not implemented.
</span>
</dd>
</dt>
<dt id="constant.socket-enomsg">
<span class="term">
<strong><code>SOCKET_ENOMSG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No message of desired type.
</span>
</dd>
</dt>
<dt id="constant.socket-eidrm">
<span class="term">
<strong><code>SOCKET_EIDRM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Identifier removed.
</span>
</dd>
</dt>
<dt id="constant.socket-echrng">
<span class="term">
<strong><code>SOCKET_ECHRNG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Channel number out of range.
</span>
</dd>
</dt>
<dt id="constant.socket-el2nsync">
<span class="term">
<strong><code>SOCKET_EL2NSYNC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Level 2 not synchronized.
</span>
</dd>
</dt>
<dt id="constant.socket-el3hlt">
<span class="term">
<strong><code>SOCKET_EL3HLT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Level 3 halted.
</span>
</dd>
</dt>
<dt id="constant.socket-el3rst">
<span class="term">
<strong><code>SOCKET_EL3RST</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Level 3 reset.
</span>
</dd>
</dt>
<dt id="constant.socket-elnrng">
<span class="term">
<strong><code>SOCKET_ELNRNG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Link number out of range.
</span>
</dd>
</dt>
<dt id="constant.socket-eunatch">
<span class="term">
<strong><code>SOCKET_EUNATCH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Protocol driver not attached.
</span>
</dd>
</dt>
<dt id="constant.socket-enocsi">
<span class="term">
<strong><code>SOCKET_ENOCSI</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No CSI structure available.
</span>
</dd>
</dt>
<dt id="constant.socket-el2hlt">
<span class="term">
<strong><code>SOCKET_EL2HLT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Level 2 halted.
</span>
</dd>
</dt>
<dt id="constant.socket-ebade">
<span class="term">
<strong><code>SOCKET_EBADE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Invalid exchange.
</span>
</dd>
</dt>
<dt id="constant.socket-ebadr">
<span class="term">
<strong><code>SOCKET_EBADR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Invalid request descriptor.
</span>
</dd>
</dt>
<dt id="constant.socket-exfull">
<span class="term">
<strong><code>SOCKET_EXFULL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Exchange full.
</span>
</dd>
</dt>
<dt id="constant.socket-enoano">
<span class="term">
<strong><code>SOCKET_ENOANO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No anode.
</span>
</dd>
</dt>
<dt id="constant.socket-ebadrqc">
<span class="term">
<strong><code>SOCKET_EBADRQC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Invalid request code.
</span>
</dd>
</dt>
<dt id="constant.socket-ebadslt">
<span class="term">
<strong><code>SOCKET_EBADSLT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Invalid slot.
</span>
</dd>
</dt>
<dt id="constant.socket-enostr">
<span class="term">
<strong><code>SOCKET_ENOSTR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Device not a stream.
</span>
</dd>
</dt>
<dt id="constant.socket-enodata">
<span class="term">
<strong><code>SOCKET_ENODATA</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No data available.
</span>
</dd>
</dt>
<dt id="constant.socket-etime">
<span class="term">
<strong><code>SOCKET_ETIME</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Timer expired.
</span>
</dd>
</dt>
<dt id="constant.socket-enosr">
<span class="term">
<strong><code>SOCKET_ENOSR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Out of streams resources.
</span>
</dd>
</dt>
<dt id="constant.socket-enonet">
<span class="term">
<strong><code>SOCKET_ENONET</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Machine is not on the network.
</span>
</dd>
</dt>
<dt id="constant.socket-enolink">
<span class="term">
<strong><code>SOCKET_ENOLINK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Link has been severed.
</span>
</dd>
</dt>
<dt id="constant.socket-eadv">
<span class="term">
<strong><code>SOCKET_EADV</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Advertise error.
</span>
</dd>
</dt>
<dt id="constant.socket-esrmnt">
<span class="term">
<strong><code>SOCKET_ESRMNT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Srmount error.
</span>
</dd>
</dt>
<dt id="constant.socket-ecomm">
<span class="term">
<strong><code>SOCKET_ECOMM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Communication error on send.
</span>
</dd>
</dt>
<dt id="constant.socket-eproto">
<span class="term">
<strong><code>SOCKET_EPROTO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Protocol error.
</span>
</dd>
</dt>
<dt id="constant.socket-emultihop">
<span class="term">
<strong><code>SOCKET_EMULTIHOP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Multihop attempted.
</span>
</dd>
</dt>
<dt id="constant.socket-ebadmsg">
<span class="term">
<strong><code>SOCKET_EBADMSG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Not a data message.
</span>
</dd>
</dt>
<dt id="constant.socket-enotuniq">
<span class="term">
<strong><code>SOCKET_ENOTUNIQ</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Name not unique on network.
</span>
</dd>
</dt>
<dt id="constant.socket-ebadfd">
<span class="term">
<strong><code>SOCKET_EBADFD</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
File descriptor in bad state.
</span>
</dd>
</dt>
<dt id="constant.socket-eremchg">
<span class="term">
<strong><code>SOCKET_EREMCHG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Remote address changed.
</span>
</dd>
</dt>
<dt id="constant.socket-erestart">
<span class="term">
<strong><code>SOCKET_ERESTART</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Interrupted system call should be restarted.
</span>
</dd>
</dt>
<dt id="constant.socket-estrpipe">
<span class="term">
<strong><code>SOCKET_ESTRPIPE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Streams pipe error.
</span>
</dd>
</dt>
<dt id="constant.socket-eprotoopt">
<span class="term">
<strong><code>SOCKET_EPROTOOPT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Protocol not available.
</span>
</dd>
</dt>
<dt id="constant.socket-addrinuse">
<span class="term">
<strong><code>SOCKET_ADDRINUSE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Address already in use.
</span>
</dd>
</dt>
<dt id="constant.socket-etoomanyrefs">
<span class="term">
<strong><code>SOCKET_ETOOMANYREFS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Too many references: cannot splice.
</span>
</dd>
</dt>
<dt id="constant.socket-eisnam">
<span class="term">
<strong><code>SOCKET_EISNAM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Is a named type file.
</span>
</dd>
</dt>
<dt id="constant.socket-eremoteio">
<span class="term">
<strong><code>SOCKET_EREMOTEIO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Remote I/O error.
</span>
</dd>
</dt>
<dt id="constant.socket-edquot">
<span class="term">
<strong><code>SOCKET_EDQUOT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Quota exceeded.
</span>
</dd>
</dt>
<dt id="constant.socket-enomedium">
<span class="term">
<strong><code>SOCKET_ENOMEDIUM</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
No medium found.
</span>
</dd>
</dt>
<dt id="constant.socket-emediumtype">
<span class="term">
<strong><code>SOCKET_EMEDIUMTYPE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Wrong medium type.
</span>
</dd>
</dt>
</dl>
</div>
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