AF_UNIX = 1
AF_INET = 2
SOCK_STREAM = 1
SOCK_DGRAM = 2
SOCK_RAW = 3
SOCK_SEQPACKET = 5
SOCK_RDM = 4
MSG_OOB = 1
MSG_WAITALL = 64
MSG_PEEK = 2
MSG_DONTROUTE = 4
SO_DEBUG = 1
SO_REUSEADDR = 4
SO_KEEPALIVE = 8
SO_DONTROUTE = 16
SO_LINGER = 128
SO_BROADCAST = 32
SO_OOBINLINE = 256
SO_SNDBUF = 4097
SO_RCVBUF = 4098
SO_SNDLOWAT = 4099
SO_RCVLOWAT = 4100
SO_SNDTIMEO = 4101
SO_RCVTIMEO = 4102
SO_TYPE = 4104
SO_ERROR = 4103
SOL_SOCKET = 65535
SOMAXCONN = 128
PHP_NORMAL_READ = 1
PHP_BINARY_READ = 2
SOL_TCP = 6
SOL_UDP = 17

## 에러 관련
##
SOCKET_EPERM = 1
SOCKET_ENOENT = 2
SOCKET_EINTR = 4
SOCKET_EIO = 5
SOCKET_ENXIO = 6
SOCKET_E2BIG = 7
SOCKET_EBADF = 9
SOCKET_EAGAIN = 35
SOCKET_ENOMEM = 12
SOCKET_EACCES = 13
SOCKET_EFAULT = 14
SOCKET_ENOTBLK = 15
SOCKET_EBUSY = 16
SOCKET_EEXIST = 17
SOCKET_EXDEV = 18
SOCKET_ENODEV = 19
SOCKET_ENOTDIR = 20
SOCKET_EISDIR = 21
SOCKET_EINVAL = 22
SOCKET_ENFILE = 23
SOCKET_EMFILE = 24
SOCKET_ENOTTY = 25
SOCKET_ENOSPC = 28
SOCKET_ESPIPE = 29
SOCKET_EROFS = 30
SOCKET_EMLINK = 31
SOCKET_EPIPE = 32
SOCKET_ENAMETOOLONG = 63
SOCKET_ENOLCK = 77
SOCKET_ENOSYS = 78
SOCKET_ENOTEMPTY = 66
SOCKET_ELOOP = 62
SOCKET_EWOULDBLOCK = 35
SOCKET_ENOMSG = 83
SOCKET_EIDRM = 82
SOCKET_EREMOTE = 71
SOCKET_EUSERS = 68
SOCKET_ENOTSOCK = 38
SOCKET_EDESTADDRREQ = 39
SOCKET_EMSGSIZE = 40
SOCKET_EPROTOTYPE = 41
SOCKET_ENOPROTOOPT = 42
SOCKET_EPROTONOSUPPORT = 43
SOCKET_ESOCKTNOSUPPORT = 44
SOCKET_EOPNOTSUPP = 45
SOCKET_EPFNOSUPPORT = 46
SOCKET_EAFNOSUPPORT = 47
SOCKET_EADDRINUSE = 48
SOCKET_EADDRNOTAVAIL = 49
SOCKET_ENETDOWN = 50
SOCKET_ENETUNREACH = 51
SOCKET_ENETRESET = 52
SOCKET_ECONNABORTED = 53
SOCKET_ECONNRESET = 54
SOCKET_ENOBUFS = 55
SOCKET_EISCONN = 56
SOCKET_ENOTCONN = 57
SOCKET_ESHUTDOWN = 58
SOCKET_ETOOMANYREFS = 59
SOCKET_ETIMEDOUT = 60
SOCKET_ECONNREFUSED = 61
SOCKET_EHOSTDOWN = 64
SOCKET_EHOSTUNREACH = 65
SOCKET_EALREADY = 37
SOCKET_EINPROGRESS = 36
SOCKET_EDQUOT = 69

## 에러 메시지
##
for($i=1; $i<=86; $i++) echo "$i:
".socket_strerror($i)."\n";

1: Operation not permitted
2: No such file or directory
3: No such process
4: Interrupted system call
5: Input/output error
6: Device not configured
7: Argument list too long
8: Exec format error
9: Bad file descriptor
10: No child processes
11: Resource deadlock avoided
12: Cannot allocate memory
13: Permission denied
14: Bad address
15: Block device required
16: Device busy
17: File exists
18: Cross-device link
19: Operation not supported by device
20: Not a directory
21: Is a directory
22: Invalid argument
23: Too many open files in system
24: Too many open files
25: Inappropriate ioctl for device
26: Text file busy
27: File too large
28: No space left on device
29: Illegal seek
30: Read-only file system
31: Too many links
32: Broken pipe
33: Numerical argument out of domain
34: Result too large
35: Resource temporarily unavailable
36: Operation now in progress
37: Operation already in progress
38: Socket operation on non-socket
39: Destination address required
40: Message too long
41: Protocol wrong type for socket
42: Protocol not available
43: Protocol not supported
44: Socket type not supported
45: Operation not supported
46: Protocol family not supported
47: Address family not supported by protocol family
48: Address already in use
49: Can't assign requested address
50: Network is down
51: Network is unreachable
52: Network dropped connection on reset
53: Software caused connection abort
54: Connection reset by peer
55: No buffer space available
56: Socket is already connected
57: Socket is not connected
58: Can't send after socket shutdown
59: Too many references: can't splice
60: Operation timed out
61: Connection refused
62: Too many levels of symbolic links
63: File name too long
64: Host is down
65: No route to host
66: Directory not empty
67: Too many processes
68: Too many users
69: Disc quota exceeded
70: Stale NFS file handle
71: Too many levels of remote in path
72: RPC struct is bad
73: RPC version wrong
74: RPC prog. not avail
75: Program version wrong
76: Bad procedure for program
77: No locks available
78: Function not implemented
79: Inappropriate file type or format
80: Authentication error
81: Need authenticator
82: Identifier removed
83: No message of desired type
84: Value too large to be stored in data type
85: Operation canceled
86: Illegal byte sequence