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# 定義済み定数

以下の定数が定義されています。 この関数の拡張モジュールが PHP 組み込みでコンパイルされているか、 実行時に動的にロードされている場合のみ使用可能です。

`AF_UNIX` ( integer )
`AF_INET` ( integer )
`AF_INET6` ( integer )
  IPv6 サポートつきでコンパイルした場合にのみ使用可能です。
`SOCK_STREAM` ( integer )
`SOCK_DGRAM` ( integer )
`SOCK_RAW` ( integer )
`SOCK_SEQPACKET` ( integer )
`SOCK_RDM` ( integer )
`MSG_OOB` ( integer )
`MSG_WAITALL` ( integer )
`MSG_PEEK` ( integer )
`MSG_DONTROUTE` ( integer )
`MSG_EOR` ( integer )
  Windows プラットフォームでは使用できません。
`MSG_EOF` ( integer )
  Windows プラットフォームでは使用できません。
`SO_DEBUG` ( integer )
`SO_REUSEADDR` ( integer )
`SO_KEEPALIVE` ( integer )
`SO_DONTROUTE` ( integer )
`SO_LINGER` ( integer )
`SO_BROADCAST` ( integer )
`SO_OOBINLINE` ( integer )
`SO_SNDBUF` ( integer )
`SO_RCVBUF` ( integer )
`SO_SNDLOWAT` ( integer )
`SO_RCVLOWAT` ( integer )
`SO_SNDTIMEO` ( integer )
`SO_RCVTIMEO` ( integer )
`SO_TYPE` ( integer )
`SO_ERROR` ( integer )
`TCP_NODELAY` ( integer )
  Nagle TCP アルゴリズムを無効にするために使用します。 PHP 5.2.7 で追加されました。
`SOL_SOCKET` ( integer )
`PHP_NORMAL_READ` ( integer )
`PHP_BINARY_READ` ( integer )
`SOL_TCP` ( integer )
`SOL_UDP` ( integer )

以下の定数は Windows でのみ定義されています。

`SOCKET_EINTR` ( integer )
`SOCKET_EBADF` ( integer )
`SOCKET_EACCES` ( integer )
`SOCKET_EFAULT` ( integer )
`SOCKET_EINVAL` ( integer )
`SOCKET_EMFILE` ( integer )
`SOCKET_EWOULDBLOCK` ( integer )
`SOCKET_EINPROGRESS` ( integer )
`SOCKET_EALREADY` ( integer )
`SOCKET_ENOTSOCK` ( integer )
`SOCKET_EDESTADDRREQ` ( integer )
`SOCKET_EMSGSIZE` ( integer )
`SOCKET_EPROTOTYPE` ( integer )
`SOCKET_ENOPROTOOPT` ( integer )
`SOCKET_EPROTONOSUPPORT` ( integer )
`SOCKET_ESOCKTNOSUPPORT` ( integer )
`SOCKET_EOPNOTSUPP` ( integer )
`SOCKET_EPFNOSUPPORT` ( integer )
`SOCKET_EAFNOSUPPORT` ( integer )
`SOCKET_EADDRINUSE` ( integer )
`SOCKET_EADDRNOTAVAIL` ( integer )
`SOCKET_ENETDOWN` ( integer )
`SOCKET_ENETUNREACH` ( integer )
`SOCKET_ENETRESET` ( integer )
`SOCKET_ECONNABORTED` ( integer )
`SOCKET_ECONNRESET` ( integer )
`SOCKET_ENOBUFS` ( integer )
`SOCKET_EISCONN` ( integer )
`SOCKET_ENOTCONN` ( integer )
`SOCKET_ESHUTDOWN` ( integer )
`SOCKET_ETOOMYREFS` ( integer )
`SOCKET_ETIMEDOUT` ( integer )
`SOCKET_ECONNREFUSED` ( integer )
`SOCKET_ELOOP` ( integer )
`SOCKET_ENAMETOOLONG` ( integer )
`SOCKET_EHOSTDOWN` ( integer )
`SOCKET_EHOSTUNREACH` ( integer )
`SOCKET_ENOTEMPTY` ( integer )
`SOCKET_EPROCLIM` ( integer )
`SOCKET_EUSERS` ( integer )
`SOCKET_EDUOT` ( integer )
`SOCKET_ESTALE` ( integer )
`SOCKET_EREMOTE` ( integer )
`SOCKET_EDISCON` ( integer )
`SOCKET_SYSNOTREADY` ( integer )
`SOCKET_VERNOTSUPPORTED` ( integer )
`SOCKET_NOTINITIALISED` ( integer )
`SOCKET_HOST_NOT_FOUND` ( integer )
`SOCKET_TRY_AGAIN` ( integer )
`SOCKET_NO_RECOVERY` ( integer )
`SOCKET_NO_DATA` ( integer )
`SOCKET_NO_ADDRESS` ( integer )

以下の定数は UNIX ライクなプラットフォームでのみ使用可能です。 各定数は、そのプラットフォーム上で同等のものが定義されている場合にのみ定義されています。

`SOCKET_EPERM` ( integer )
  Operation not permitted.
`SOCKET_ENOENT` ( integer )
  No such file or directory.
`SOCKET_EINTR` ( integer )
  Interrupted system call.
`SOCKET_EIO` ( integer )
  I/O error.
`SOCKET_ENXIO` ( integer )
  No such device or address.
`SOCKET_E2BIG` ( integer )
  Arg list too long.
`SOCKET_EBADF` ( integer )
  Bad file number.
`SOCKET_EAGAIN` ( integer )
  Try again.
`SOCKET_ENOMEM` ( integer )
  Out of memory.
`SOCKET_EACCES` ( integer )
  Permission denied.
`SOCKET_EFAULT` ( integer )
  Bad address.
`SOCKET_ENOTBLK` ( integer )
  Block device required.
`SOCKET_EBUSY` ( integer )
  Device or resource busy.
`SOCKET_EEXIST` ( integer )
  File exists.
`SOCKET_EXDEV` ( integer )
  Cross-device link.
`SOCKET_ENODEV` ( integer )
  No such device.
`SOCKET_ENOTDIR` ( integer )
  Not a directory.
`SOCKET_EISDIR` ( integer )
  Is a directory.
`SOCKET_EINVAL` ( integer )
  Invalid argument.
`SOCKET_ENFILE` ( integer )
  File table overflow.
`SOCKET_EMFILE` ( integer )
  Too many open files.
`SOCKET_ENOTTY` ( integer )
  Not a typewriter.
`SOCKET_ENOSPC` ( integer )
  No space left on device.
`SOCKET_ESPIPE` ( integer )
  Illegal seek.
`SOCKET_EROFS` ( integer )
  Read-only file system.
`SOCKET_EMLINK` ( integer )
  Too many links.
`SOCKET_EPIPE` ( integer )
  Broken pipe.
`SOCKET_ENAMETOOLONG` ( integer )
  File name too long.
`SOCKET_ENOLCK` ( integer )
  No record locks available.
`SOCKET_ENOSYS` ( integer )
  Function not implemented.
`SOCKET_ENOTEMPTY` ( integer )
  Directory not empty.
`SOCKET_ELOOP` ( integer )
  Too many symbolic links encountered.
`SOCKET_EWOULDBLOCK` ( integer )
  Operation would block.
`SOCKET_ENOMSG` ( integer )
  No message of desired type.
`SOCKET_EIDRM` ( integer )
  Identifier removed.
`SOCKET_ECHRNG` ( integer )
  Channel number out of range.
`SOCKET_EL2NSYNC` ( integer )
  Level 2 not synchronized.
`SOCKET_EL3HLT` ( integer )
  Level 3 halted.
`SOCKET_EL3RST` ( integer )
  Level 3 reset.
`SOCKET_ELNRNG` ( integer )
  Link number out of range.
`SOCKET_EUNATCH` ( integer )
  Protocol driver not attached.
`SOCKET_ENOCSI` ( integer )
  No CSI structure available.
`SOCKET_EL2HLT` ( integer )
  Level 2 halted.
`SOCKET_EBADE` ( integer )
  Invalid exchange.
`SOCKET_EBADR` ( integer )
  Invalid request descriptor.
`SOCKET_EXFULL` ( integer )
  Exchange full.
`SOCKET_ENOANO` ( integer )
  No anode.
`SOCKET_EBADRQC` ( integer )
  Invalid request code.
`SOCKET_EBADSLT` ( integer )
  Invalid slot.
`SOCKET_ENOSTR` ( integer )
  Device not a stream.
`SOCKET_ENODATA` ( integer )
  No data available.
`SOCKET_ETIME` ( integer )
  Timer expired.
`SOCKET_ENOSR` ( integer )
  Out of streams resources.
`SOCKET_ENONET` ( integer )
  Machine is not on the network.
`SOCKET_EREMOTE` ( integer )
  Object is remote.
`SOCKET_ENOLINK` ( integer )
  Link has been severed.
`SOCKET_EADV` ( integer )
  Advertise error.
`SOCKET_ESRMNT` ( integer )
  Srmount error.
`SOCKET_ECOMM` ( integer )
  Communication error on send.
`SOCKET_EPROTO` ( integer )
  Protocol error.
`SOCKET_EMULTIHOP` ( integer )
  Multihop attempted.
`SOCKET_EBADMSG` ( integer )
  Not a data message.
`SOCKET_ENOTUNIQ` ( integer )
  Name not unique on network.
`SOCKET_EBADFD` ( integer )
  File descriptor in bad state.
`SOCKET_EREMCHG` ( integer )
  Remote address changed.
`SOCKET_ERESTART` ( integer )
  Interrupted system call should be restarted.
`SOCKET_ESTRPIPE` ( integer )
  Streams pipe error.
`SOCKET_EUSERS` ( integer )
  Too many users.
`SOCKET_ENOTSOCK` ( integer )
  Socket operation on non-socket.
`SOCKET_EDESTADDRREQ` ( integer )
  Destination address required.
`SOCKET_EMSGSIZE` ( integer )
  Message too long.
`SOCKET_EPROTOTYPE` ( integer )
  Protocol wrong type for socket.
`SOCKET_EPROTOOPT` ( integer )
  Protocol not available.
`SOCKET_EPROTONOSUPPORT` ( integer )
  Protocol not supported.
`SOCKET_ESOCKTNOSUPPORT` ( integer )
  Socket type not supported.
`SOCKET_EOPNOTSUPP` ( integer )
  Operation not supported on transport endpoint.
`SOCKET_EPFNOSUPPORT` ( integer )
  Protocol family not supported.
`SOCKET_EAFNOSUPPORT` ( integer )
  Address family not supported by protocol.
`SOCKET_ADDRINUSE` ( integer )
  Address already in use.
`SOCKET_EADDRNOTAVAIL` ( integer )
  Cannot assign requested address.
`SOCKET_ENETDOWN` ( integer )
  Network is down.
`SOCKET_ENETUNREACH` ( integer )
  Network is unreachable.
`SOCKET_ENETRESET` ( integer )
  Network dropped connection because of reset.
`SOCKET_ECONNABORTED` ( integer )
  Software caused connection abort.
`SOCKET_ECONNRESET` ( integer )
  Connection reset by peer.
`SOCKET_ENOBUFS` ( integer )
  No buffer space available.
`SOCKET_EISCONN` ( integer )
  Transport endpoint is already connected.
`SOCKET_ENOTCONN` ( integer )
  Transport endpoint is not connected.
`SOCKET_ESHUTDOWN` ( integer )
  Cannot send after transport endpoint shutdown.
`SOCKET_ETOOMANYREFS` ( integer )
  Too many references: cannot splice.
`SOCKET_ETIMEDOUT` ( integer )
  Connection timed out.
`SOCKET_ECONNREFUSED` ( integer )
  Connection refused.
`SOCKET_EHOSTDOWN` ( integer )
  Host is down.
`SOCKET_EHOSTUNREACH` ( integer )
  No route to host.
`SOCKET_EALREADY` ( integer )
  Operation already in progress.
`SOCKET_EINPROGRESS` ( integer )
  Operation now in progress.
`SOCKET_EISNAM` ( integer )
  Is a named type file.
`SOCKET_EREMOTEIO` ( integer )
  Remote I/O error.
`SOCKET_EDQUOT` ( integer )
  Quota exceeded.
`SOCKET_ENOMEDIUM` ( integer )
  No medium found.
`SOCKET_EMEDIUMTYPE` ( integer )
  Wrong medium type.

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