Fixed a bunch of stuff. Added mike's patches.

1 files changed, 187 insertions, 266 deletions

diff --git a/src/wsocket.c b/src/wsocket.c
index a264452..d9da6fc 100644
--- a/src/wsocket.c
+++ b/src/wsocket.c
@@ -13,7 +13,6 @@
 
 /* WinSock doesn't have a strerror... */
 static const char *wstrerror(int err);
-static int wisclosed(int err);
 
 /*-------------------------------------------------------------------------*\
 * Initializes module 
@@ -39,14 +38,43 @@ int sock_close(void) {
 }
 
 /*-------------------------------------------------------------------------*\
+* Wait for readable/writable/connected socket with timeout
+\*-------------------------------------------------------------------------*/
+#define WAITFD_R        1
+#define WAITFD_W        2
+#define WAITFD_E        4
+#define WAITFD_C        (WAITFD_E|WAITFD_W)
+
+static int sock_waitfd(t_sock fd, int sw, p_tm tm) {
+    int ret;
+    fd_set rfds, wfds, efds, *rp = NULL, *wp = NULL, *ep = NULL;
+    struct timeval tv, *tp = NULL;
+    double t;
+    if (tm_iszero(tm)) return IO_TIMEOUT;  /* optimize timeout == 0 case */
+    if (sw & WAITFD_R) { FD_ZERO(&rfds); FD_SET(fd, &rfds); rp = &rfds; }
+    if (sw & WAITFD_W) { FD_ZERO(&wfds); FD_SET(fd, &wfds); wp = &wfds; }
+    if (sw & WAITFD_C) { FD_ZERO(&efds); FD_SET(fd, &efds); ep = &efds; }
+    if ((t = tm_get(tm)) >= 0.0) {
+        tv.tv_sec = (int) t;
+        tv.tv_usec = (int) ((t-tv.tv_sec)*1.0e6);
+        tp = &tv;
+    }
+    ret = select(0, rp, wp, ep, tp);
+    if (ret == -1) return WSAGetLastError();
+    if (ret == 0) return IO_TIMEOUT;
+    if (sw == WAITFD_C && FD_ISSET(fd, &efds)) return IO_CLOSED;
+    return IO_DONE;
+}
+
+/*-------------------------------------------------------------------------*\
 * Select with int timeout in ms
 \*-------------------------------------------------------------------------*/
 int sock_select(int n, fd_set *rfds, fd_set *wfds, fd_set *efds, p_tm tm) {
-    struct timeval tv;
+    struct timeval tv; 
     double t = tm_get(tm);
     tv.tv_sec = (int) t;
     tv.tv_usec = (int) ((t - tv.tv_sec) * 1.0e6);
-    return select(n, rfds, wfds, efds, t >= 0.0? &tv: NULL);
+    return select(0, rfds, wfds, efds, t >= 0.0? &tv: NULL);
 }
 
 /*-------------------------------------------------------------------------*\
@@ -72,62 +100,45 @@ void sock_shutdown(p_sock ps, int how) {
 /*-------------------------------------------------------------------------*\
 * Creates and sets up a socket
 \*-------------------------------------------------------------------------*/
-const char *sock_create(p_sock ps, int domain, int type, int protocol) {
-    t_sock sock = socket(domain, type, protocol);
-    if (sock == SOCK_INVALID) return sock_strerror();
-    *ps = sock;
-    return NULL;
+int sock_create(p_sock ps, int domain, int type, int protocol) {
+    *ps = socket(domain, type, protocol);
+    if (*ps != SOCK_INVALID) return IO_DONE;
+    else return WSAGetLastError();
 }
 
 /*-------------------------------------------------------------------------*\
 * Connects or returns error message
 \*-------------------------------------------------------------------------*/
-const char *sock_connect(p_sock ps, SA *addr, socklen_t addr_len, p_tm tm) {
-    t_sock sock = *ps;
+int sock_connect(p_sock ps, SA *addr, socklen_t len, p_tm tm) {
     int err;
-    fd_set efds, wfds;
     /* don't call on closed socket */
-    if (sock == SOCK_INVALID) return io_strerror(IO_CLOSED);
+    if (*ps == SOCK_INVALID) return IO_CLOSED;
     /* ask system to connect */
-    err = connect(sock, addr, addr_len);
-    /* if no error, we're done */
-    if (err == 0) return NULL;
+    if (connect(*ps, addr, len) == 0) return IO_DONE;
     /* make sure the system is trying to connect */
     err = WSAGetLastError();
-    if (err != WSAEWOULDBLOCK) return wstrerror(err);
-    /* optimize for timeout=0 */
-    if (tm_get(tm) == 0.0) return io_strerror(IO_TIMEOUT);
-    /* wait for a timeout or for the system's answer */
-    FD_ZERO(&wfds); FD_SET(sock, &wfds);
-    FD_ZERO(&efds); FD_SET(sock, &efds);
-    /* we run select to wait */
-    err = sock_select(0, NULL, &wfds, &efds, tm);
-    /* if select returned due to an event */
-    if (err > 0) {
-        /* if was in efds, we failed */
-        if (FD_ISSET(sock, &efds)) {
-            int why, len = sizeof(why);
-            /* give windows time to set the error (disgusting) */
-            Sleep(0);
-            /* find out why we failed */
-            getsockopt(sock, SOL_SOCKET, SO_ERROR, (char *)&why, &len); 
-            /* we KNOW there was an error. if why is 0, we will return
-             * "unknown error", but it's not really our fault */
-            return wstrerror(why); 
-        /* otherwise it must be in wfds, so we succeeded */
-        } else return NULL;
-    /* if no event happened, we timed out */
-    } else if (err == 0) return io_strerror(IO_TIMEOUT);
-    return sock_strerror();
+    if (err != WSAEWOULDBLOCK && err != WSAEINPROGRESS) return err;
+    /* we wait until something happens */
+    if ((err = sock_waitfd(*ps, WAITFD_C, tm)) == IO_CLOSED) {
+        int len = sizeof(err);
+        /* give windows time to set the error (yes, disgusting) */
+        Sleep(0);
+        /* find out why we failed */
+        getsockopt(*ps, SOL_SOCKET, SO_ERROR, (char *)&err, &len); 
+        /* we KNOW there was an error. if why is 0, we will return
+         * "unknown error", but it's not really our fault */
+        return err > 0? err: IO_UNKNOWN; 
+    /* here we deal with the case in which it worked, timedout or weird errors */
+    } else return err;
 }
 
 /*-------------------------------------------------------------------------*\
 * Binds or returns error message
 \*-------------------------------------------------------------------------*/
-const char *sock_bind(p_sock ps, SA *addr, socklen_t addr_len) {
-    const char *err = NULL;
+int sock_bind(p_sock ps, SA *addr, socklen_t len) {
+    int err = IO_DONE;
     sock_setblocking(ps);
-    if (bind(*ps, addr, addr_len) < 0) err = sock_strerror();
+    if (bind(*ps, addr, len) < 0) err = WSAGetLastError();
     sock_setnonblocking(ps);
     return err;
 }
@@ -135,10 +146,10 @@ const char *sock_bind(p_sock ps, SA *addr, socklen_t addr_len) {
 /*-------------------------------------------------------------------------*\
 * 
 \*-------------------------------------------------------------------------*/
-const char *sock_listen(p_sock ps, int backlog) {
-    const char *err = NULL;
+int sock_listen(p_sock ps, int backlog) {
+    int err = IO_DONE;
     sock_setblocking(ps);
-    if (listen(*ps, backlog) < 0) err = sock_strerror();
+    if (listen(*ps, backlog) < 0) err = WSAGetLastError();
     sock_setnonblocking(ps);
     return err;
 }
@@ -146,35 +157,25 @@ const char *sock_listen(p_sock ps, int backlog) {
 /*-------------------------------------------------------------------------*\
 * Accept with timeout
 \*-------------------------------------------------------------------------*/
-const char *sock_accept(p_sock ps, p_sock pa, SA *addr, 
-        socklen_t *addr_len, p_tm tm) {
-    t_sock sock = *ps;
-    SA dummy_addr;
-    socklen_t dummy_len = sizeof(dummy_addr);
-    if (sock == SOCK_INVALID) return io_strerror(IO_CLOSED);
-    if (!addr) addr = &dummy_addr;
-    if (!addr_len) addr_len = &dummy_len;
-    for (;;) {
-        fd_set rfds;
+int sock_accept(p_sock ps, p_sock pa, SA *addr, socklen_t *len, p_tm tm) {
+    SA daddr;
+    socklen_t dlen = sizeof(daddr);
+    if (*ps == SOCK_INVALID) return IO_CLOSED;
+    if (!addr) addr = &daddr;
+    if (!len) len = &dlen;
+    for ( ;; ) {
         int err;
         /* try to get client socket */
-        *pa = accept(sock, addr, addr_len);
-        /* if return is valid, we are done */
-        if (*pa != SOCK_INVALID) return NULL;
-        /* otherwise find out why we failed */
+        if ((*pa = accept(*ps, addr, len)) != SOCK_INVALID) return IO_DONE;
+        /* find out why we failed */
         err = WSAGetLastError(); 
         /* if we failed because there was no connectoin, keep trying */
-        if (err != WSAEWOULDBLOCK) return wstrerror(err);
-        /* optimize for the timeout=0 case */
-        if (tm_get(tm) == 0.0) return io_strerror(IO_TIMEOUT);
+        if (err != WSAEWOULDBLOCK && err != WSAECONNABORTED) return err;
         /* call select to avoid busy wait */
-        FD_ZERO(&rfds);
-        FD_SET(sock, &rfds);
-        err = sock_select(0, &rfds, NULL, NULL, tm);
-        if (err == 0) return io_strerror(IO_TIMEOUT);
-        else if (err < 0) break;
+        if ((err = sock_waitfd(*ps, WAITFD_R, tm)) != IO_DONE) return err;
     } 
-    return sock_strerror();
+    /* can't reach here */
+    return IO_UNKNOWN; 
 }
 
 /*-------------------------------------------------------------------------*\
@@ -182,131 +183,93 @@ const char *sock_accept(p_sock ps, p_sock pa, SA *addr,
 \*-------------------------------------------------------------------------*/
 int sock_send(p_sock ps, const char *data, size_t count, size_t *sent, p_tm tm)
 {
-    t_sock sock = *ps;
+    int err;
     /* avoid making system calls on closed sockets */
-    if (sock == SOCK_INVALID) return IO_CLOSED;
+    if (*ps == SOCK_INVALID) return IO_CLOSED;
+    /* loop until we send something or we give up on error */
+    *sent = 0;
     for ( ;; ) {
-        fd_set fds;
-        int ret, put;
         /* try to send something */
-        put = send(sock, data, (int) count, 0);
+        int put = send(*ps, data, (int) count, 0);
         /* if we sent something, we are done */
         if (put > 0) {
             *sent = put;
             return IO_DONE;
         }
         /* deal with failure */
-        *sent = 0;
-        ret = WSAGetLastError(); 
-        /* check for connection closed */
-        if (wisclosed(ret)) return IO_CLOSED;
+        err = WSAGetLastError(); 
         /* we can only proceed if there was no serious error */
-        if (ret != WSAEWOULDBLOCK) return IO_USER;
-        /* optimize for the timeout = 0 case */
-        if (tm_get(tm) == 0.0) return IO_TIMEOUT;
-        /* run select to avoid busy wait */
-        FD_ZERO(&fds);
-        FD_SET(sock, &fds);
-        ret = sock_select(0, NULL, &fds, NULL, tm);
-        if (ret == 0) return IO_TIMEOUT;
-        else if (ret < 0) break;
+        if (err != WSAEWOULDBLOCK) return err;
+        /* avoid busy wait */
+        if ((err = sock_waitfd(*ps, WAITFD_W, tm)) != IO_DONE) return err;
     } 
-    return IO_USER;
+    /* can't reach here */
+    return IO_UNKNOWN;
 }
 
 /*-------------------------------------------------------------------------*\
 * Sendto with timeout
 \*-------------------------------------------------------------------------*/
 int sock_sendto(p_sock ps, const char *data, size_t count, size_t *sent, 
-        SA *addr, socklen_t addr_len, p_tm tm)
+        SA *addr, socklen_t len, p_tm tm)
 {
-    t_sock sock = *ps;
-    /* avoid making system calls on closed sockets */
-    if (sock == SOCK_INVALID) return IO_CLOSED;
+    int err;
+    if (*ps == SOCK_INVALID) return IO_CLOSED;
+    *sent = 0;
     for ( ;; ) {
-        fd_set fds;
-        int ret, put;
-        /* try to send something */
-        put = sendto(sock, data, (int) count, 0, addr, addr_len);
-        /* if we sent something, we are done */
+        int put = send(*ps, data, (int) count, 0);
         if (put > 0) {
             *sent = put;
             return IO_DONE;
         }
-        /* deal with failure */
-        *sent = 0;
-        ret = WSAGetLastError(); 
-        /* check for connection closed */
-        if (wisclosed(ret)) return IO_CLOSED;
-        /* we can only proceed if there was no serious error */
-        if (ret != WSAEWOULDBLOCK) return IO_USER;
-        /* optimize for the timeout = 0 case */
-        if (tm_get(tm) == 0.0) return IO_TIMEOUT;
-        /* run select to avoid busy wait */
-        FD_ZERO(&fds);
-        FD_SET(sock, &fds);
-        ret = sock_select(0, NULL, &fds, NULL, tm);
-        if (ret == 0) return IO_TIMEOUT;
-        else if (ret < 0) break;
+        err = WSAGetLastError(); 
+        if (err != WSAEWOULDBLOCK) return err;
+        if ((err = sock_waitfd(*ps, WAITFD_W, tm)) != IO_DONE) return err;
     } 
-    return IO_USER;
+    return IO_UNKNOWN;
 }
 
 /*-------------------------------------------------------------------------*\
 * Receive with timeout
 \*-------------------------------------------------------------------------*/
-int sock_recv(p_sock ps, char *data, size_t count, size_t *got, p_tm tm)
-{
-    t_sock sock = *ps;
-    if (sock == SOCK_INVALID) return IO_CLOSED;
+int sock_recv(p_sock ps, char *data, size_t count, size_t *got, p_tm tm) {
+    int err;
+    if (*ps == SOCK_INVALID) return IO_CLOSED;
+    *got = 0;
     for ( ;; ) {
-        fd_set fds;
-        int ret, taken;
-        taken = recv(sock, data, (int) count, 0);
+        int taken = recv(*ps, data, (int) count, 0);
         if (taken > 0) {
             *got = taken;
             return IO_DONE;
         }
-        *got = 0;
-        if (taken == 0 || wisclosed(ret = WSAGetLastError())) return IO_CLOSED;
-        if (ret != WSAEWOULDBLOCK) return IO_USER;
-        if (tm_get(tm) == 0.0) return IO_TIMEOUT;
-        FD_ZERO(&fds);
-        FD_SET(sock, &fds);
-        ret = sock_select(0, &fds, NULL, NULL, tm);
-        if (ret == 0) return IO_TIMEOUT;
-        else if (ret < 0) break;
+        if (taken == 0) return IO_CLOSED;
+        err = WSAGetLastError();
+        if (err != WSAEWOULDBLOCK) return err;
+        if ((err = sock_waitfd(*ps, WAITFD_R, tm)) != IO_DONE) return err;
     }
-    return IO_TIMEOUT;
+    return IO_UNKNOWN;
 }
 
 /*-------------------------------------------------------------------------*\
 * Recvfrom with timeout
 \*-------------------------------------------------------------------------*/
 int sock_recvfrom(p_sock ps, char *data, size_t count, size_t *got, 
-        SA *addr, socklen_t *addr_len, p_tm tm)
-{
-    t_sock sock = *ps;
-    if (sock == SOCK_INVALID) return IO_CLOSED;
+        SA *addr, socklen_t *len, p_tm tm) {
+    int err;
+    if (*ps == SOCK_INVALID) return IO_CLOSED;
+    *got = 0;
     for ( ;; ) {
-        fd_set fds;
-        int ret, taken;
-        taken = recvfrom(sock, data, (int) count, 0, addr, addr_len);
+        int taken = recvfrom(*ps, data, (int) count, 0, addr, len);
         if (taken > 0) {
             *got = taken;
             return IO_DONE;
         }
-        *got = 0;
-        if (taken == 0 || wisclosed(ret = WSAGetLastError())) return IO_CLOSED;
-        if (ret != WSAEWOULDBLOCK) return IO_USER;
-        if (tm_get(tm) == 0.0) return IO_TIMEOUT;
-        FD_ZERO(&fds);
-        FD_SET(sock, &fds);
-        ret = sock_select(0, &fds, NULL, NULL, tm);
-        if (ret == 0) return IO_TIMEOUT;
-        else if (ret < 0) break;
+        if (taken == 0) return IO_CLOSED;
+        err = WSAGetLastError();
+        if (err != WSAEWOULDBLOCK) return err;
+        if ((err = sock_waitfd(*ps, WAITFD_R, tm)) != IO_DONE) return err;
     }
-    return IO_TIMEOUT;
+    return IO_UNKNOWN;
 }
 
 /*-------------------------------------------------------------------------*\
@@ -326,138 +289,96 @@ void sock_setnonblocking(p_sock ps) {
 }
 
 /*-------------------------------------------------------------------------*\
+* DNS helpers 
+\*-------------------------------------------------------------------------*/
+int sock_gethostbyaddr(const char *addr, socklen_t len, struct hostent **hp) {
+    *hp = gethostbyaddr(addr, len, AF_INET);
+    if (*hp) return IO_DONE;
+    else return h_errno;
+}
+
+int sock_gethostbyname(const char *addr, struct hostent **hp) {
+    *hp = gethostbyname(addr);
+    if (*hp) return IO_DONE;
+    else return h_errno;
+}
+
+/*-------------------------------------------------------------------------*\
 * Error translation functions
 \*-------------------------------------------------------------------------*/
-const char *sock_hoststrerror(void) {
-    int err = WSAGetLastError();
+const char *sock_hoststrerror(int err) {
+    if (err <= 0) return io_strerror(err);
     switch (err) {
-        case WSAHOST_NOT_FOUND: 
-            return "host not found";
-        default: 
-            return wstrerror(err); 
+        case WSAHOST_NOT_FOUND: return "host_not_found";
+        default: return wstrerror(err); 
     }
 }
 
-const char *sock_strerror(void) {
-    int err = WSAGetLastError();
+const char *sock_strerror(int err) {
+    if (err <= 0) return io_strerror(err);
     switch (err) {
-        case WSAEADDRINUSE: 
-            return "address already in use";
-        default: 
-            return wstrerror(err);
+        case WSAEADDRINUSE: return "eaddrinuse";
+        case WSAECONNREFUSED: return "econnrefused";
+        case WSAECONNABORTED: return "closed";
+        case WSAECONNRESET: return "closed";
+        case WSAETIMEDOUT: return "timeout";
+        default: return wstrerror(err);
     }
 }
 
-const char *sock_geterr(p_sock ps, int code) {
-    (void) ps;
-    (void) code;
-    return sock_strerror();
-}
-
-int wisclosed(int err) {
-    switch (err) {
-        case WSAECONNRESET:
-        case WSAECONNABORTED:
-        case WSAESHUTDOWN:
-        case WSAENOTCONN:
-            return 1;
-        default:
-            return 0;
-    }
+const char *sock_ioerror(p_sock ps, int err) {
+        (void) ps;
+        return sock_strerror(err);
 }
 
 static const char *wstrerror(int err) {
     switch (err) {
-        case WSAEINTR:
-            return "WSAEINTR: Interrupted function call";
-        case WSAEACCES:
-            return "WSAEACCES: Permission denied";
-        case WSAEFAULT:
-            return "WSAEFAULT: Bad address";
-        case WSAEINVAL:
-            return "WSAEINVAL: Invalid argument";
-        case WSAEMFILE:
-            return "WSAEMFILE: Too many open files";
-        case WSAEWOULDBLOCK:
-            return "WSAEWOULDBLOCK: Resource temporarily unavailable";
-        case WSAEINPROGRESS:
-            return "WSAEINPROGRESS: Operation now in progress";
-        case WSAEALREADY:
-            return "WSAEALREADY: Operation already in progress";
-        case WSAENOTSOCK:
-            return "WSAENOTSOCK: Socket operation on nonsocket";
-        case WSAEDESTADDRREQ:
-            return "WSAEDESTADDRREQ: Destination address required";
-        case WSAEMSGSIZE:
-            return "WSAEMSGSIZE: Message too long";
-        case WSAEPROTOTYPE:
-            return "WSAEPROTOTYPE: Protocol wrong type for socket";
-        case WSAENOPROTOOPT:
-            return "WSAENOPROTOOPT: Bad protocol option";
-        case WSAEPROTONOSUPPORT:
-            return "WSAEPROTONOSUPPORT: Protocol not supported";
-        case WSAESOCKTNOSUPPORT:
-            return "WSAESOCKTNOSUPPORT: Socket type not supported";
-        case WSAEOPNOTSUPP:
-            return "WSAEOPNOTSUPP: Operation not supported";
-        case WSAEPFNOSUPPORT:
-            return "WSAEPFNOSUPPORT: Protocol family not supported";
-        case WSAEAFNOSUPPORT:
-            return "WSAEAFNOSUPPORT: Address family not supported by "
-                "protocol family";
-        case WSAEADDRINUSE:
-            return "WSAEADDRINUSE: Address already in use";
-        case WSAEADDRNOTAVAIL:
-            return "WSAEADDRNOTAVAIL: Cannot assign requested address";
-        case WSAENETDOWN:
-            return "WSAENETDOWN: Network is down";
-        case WSAENETUNREACH:
-            return "WSAENETUNREACH: Network is unreachable";
-        case WSAENETRESET:
-            return "WSAENETRESET: Network dropped connection on reset";
-        case WSAECONNABORTED:
-            return "WSAECONNABORTED: Software caused connection abort";
-        case WSAECONNRESET:
-            return "WSAECONNRESET: Connection reset by peer";
-        case WSAENOBUFS:
-            return "WSAENOBUFS: No buffer space available";
-        case WSAEISCONN:
-            return "WSAEISCONN: Socket is already connected";
-        case WSAENOTCONN:
-            return "WSAENOTCONN: Socket is not connected";
-        case WSAESHUTDOWN:
-            return "WSAESHUTDOWN: Cannot send after socket shutdown";
-        case WSAETIMEDOUT:
-            return "WSAETIMEDOUT: Connection timed out";
-        case WSAECONNREFUSED:
-            return "WSAECONNREFUSED: Connection refused";
-        case WSAEHOSTDOWN:
-            return "WSAEHOSTDOWN: Host is down";
-        case WSAEHOSTUNREACH:
-            return "WSAEHOSTUNREACH: No route to host";
-        case WSAEPROCLIM:
-            return "WSAEPROCLIM: Too many processes";
-        case WSASYSNOTREADY:
-            return "WSASYSNOTREADY: Network subsystem is unavailable";
-        case WSAVERNOTSUPPORTED:
-            return "WSAVERNOTSUPPORTED: Winsock.dll version out of range";
-        case WSANOTINITIALISED:
-            return "WSANOTINITIALISED: Successful WSAStartup not yet performed";
-        case WSAEDISCON:
-            return "WSAEDISCON: Graceful shutdown in progress";
-        case WSATYPE_NOT_FOUND:
-            return "WSATYPE_NOT_FOUND: Class type not found";
-        case WSAHOST_NOT_FOUND:
-            return "WSAHOST_NOT_FOUND: Host not found";
-        case WSATRY_AGAIN:
-            return "WSATRY_AGAIN: Nonauthoritative host not found";
-        case WSANO_RECOVERY:
-            return "WSANO_RECOVERY: Nonrecoverable name lookup error"; 
-        case WSANO_DATA:
-            return "WSANO_DATA: Valid name, no data record of requested type";
-        case WSASYSCALLFAILURE:
-            return "WSASYSCALLFAILURE: System call failure";
-        default:
-            return "Unknown error";
+        case WSAEINTR: return "Interrupted function call";
+        case WSAEACCES: return "Permission denied";
+        case WSAEFAULT: return "Bad address";
+        case WSAEINVAL: return "Invalid argument";
+        case WSAEMFILE: return "Too many open files";
+        case WSAEWOULDBLOCK: return "Resource temporarily unavailable";
+        case WSAEINPROGRESS: return "Operation now in progress";
+        case WSAEALREADY: return "Operation already in progress";
+        case WSAENOTSOCK: return "Socket operation on nonsocket";
+        case WSAEDESTADDRREQ: return "Destination address required";
+        case WSAEMSGSIZE: return "Message too long";
+        case WSAEPROTOTYPE: return "Protocol wrong type for socket";
+        case WSAENOPROTOOPT: return "Bad protocol option";
+        case WSAEPROTONOSUPPORT: return "Protocol not supported";
+        case WSAESOCKTNOSUPPORT: return "Socket type not supported";
+        case WSAEOPNOTSUPP: return "Operation not supported";
+        case WSAEPFNOSUPPORT: return "Protocol family not supported";
+        case WSAEAFNOSUPPORT: 
+            return "Address family not supported by protocol family"; 
+        case WSAEADDRINUSE: return "Address already in use";
+        case WSAEADDRNOTAVAIL: return "Cannot assign requested address";
+        case WSAENETDOWN: return "Network is down";
+        case WSAENETUNREACH: return "Network is unreachable";
+        case WSAENETRESET: return "Network dropped connection on reset";
+        case WSAECONNABORTED: return "Software caused connection abort";
+        case WSAECONNRESET: return "Connection reset by peer";
+        case WSAENOBUFS: return "No buffer space available";
+        case WSAEISCONN: return "Socket is already connected";
+        case WSAENOTCONN: return "Socket is not connected";
+        case WSAESHUTDOWN: return "Cannot send after socket shutdown";
+        case WSAETIMEDOUT: return "Connection timed out";
+        case WSAECONNREFUSED: return "Connection refused";
+        case WSAEHOSTDOWN: return "Host is down";
+        case WSAEHOSTUNREACH: return "No route to host";
+        case WSAEPROCLIM: return "Too many processes";
+        case WSASYSNOTREADY: return "Network subsystem is unavailable";
+        case WSAVERNOTSUPPORTED: return "Winsock.dll version out of range";
+        case WSANOTINITIALISED: 
+            return "Successful WSAStartup not yet performed";
+        case WSAEDISCON: return "Graceful shutdown in progress";
+        case WSATYPE_NOT_FOUND: return "Class type not found";
+        case WSAHOST_NOT_FOUND: return "Host not found";
+        case WSATRY_AGAIN: return "Nonauthoritative host not found";
+        case WSANO_RECOVERY: return "Nonrecoverable name lookup error"; 
+        case WSANO_DATA: return "Valid name, no data record of requested type";
+        case WSASYSCALLFAILURE: return "System call failure";
+        default: return "Unknown error";
     }
 }