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authoroehhar <harald.oehlmann@elmicron.de>2014-04-04 16:27:39 (GMT)
committeroehhar <harald.oehlmann@elmicron.de>2014-04-04 16:27:39 (GMT)
commit4b6ab47efdc71922068677ef074031e180f359d9 (patch)
treef1e8ac0dab7af4c085e4308b6f7109aef348c13b /win/tclWinSock.c
parentf0c184a069af5733133ae8b053918986b4cff221 (diff)
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Avoid multiple returns of connect errors
Diffstat (limited to 'win/tclWinSock.c')
-rw-r--r--win/tclWinSock.c146
1 files changed, 103 insertions, 43 deletions
diff --git a/win/tclWinSock.c b/win/tclWinSock.c
index 036f3b9..ed9fa32 100644
--- a/win/tclWinSock.c
+++ b/win/tclWinSock.c
@@ -172,7 +172,7 @@ struct TcpState {
struct addrinfo *addr; /* Iterator over addrlist. */
struct addrinfo *myaddrlist;/* Local address. */
struct addrinfo *myaddr; /* Iterator over myaddrlist. */
- int status; /* Cache status of async socket. */
+ int error; /* Cache status of async socket. */
int cachedBlocking; /* Cache blocking mode of async socket. */
volatile int connectError; /* Async connect error set by notifier thread.
* Set by notifier thread, access must be
@@ -255,8 +255,7 @@ static LRESULT CALLBACK SocketProc(HWND hwnd, UINT message, WPARAM wParam,
LPARAM lParam);
static int SocketsEnabled(void);
static void TcpAccept(TcpFdList *fds, SOCKET newSocket, address addr);
-static int WaitForConnect(TcpState *statePtr, int *errorCodePtr,
- int noblock);
+static int WaitForConnect(TcpState *statePtr, int *errorCodePtr);
static int WaitForSocketEvent(TcpState *statePtr, int events,
int *errorCodePtr);
static void AddSocketInfoFd(TcpState *statePtr, SOCKET socket);
@@ -573,8 +572,13 @@ TcpBlockModeProc(
static int
WaitForConnect(
TcpState *statePtr, /* State of the socket. */
- int *errorCodePtr, /* Where to store errors? */
- int noblock) /* Don't wait, even for sockets in blocking mode */
+ int *errorCodePtr) /* Where to store errors?
+ * A passed null-pointer activates background mode.
+ * In this case, an eventual error is stored in
+ * statePtr->error.
+ * In addition, we do never block and allow a next
+ * processing cycle to happen.
+ */
{
int result;
int oldMode;
@@ -605,10 +609,11 @@ WaitForConnect(
statePtr->readyEvents &= ~(FD_CONNECT);
/*
- * For blocking sockets disable async connect
- * as we continue now synchoneously
+ * For blocking sockets and foreground processing
+ * disable async connect as we continue now synchoneously
*/
- if ( !(noblock || (statePtr->flags & TCP_ASYNC_SOCKET)) ) {
+ if ( errorCodePtr != NULL &&
+ ! (statePtr->flags & TCP_ASYNC_SOCKET) ) {
CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT);
}
@@ -624,13 +629,19 @@ WaitForConnect(
/* Succesfully connected or async connect restarted */
if (result == TCL_OK) {
if ( statePtr->flags & TCP_ASYNC_CONNECT_REENTER_PENDING ) {
- *errorCodePtr = EWOULDBLOCK;
+ if (errorCodePtr != NULL) {
+ *errorCodePtr = EWOULDBLOCK;
+ }
return -1;
}
return 0;
}
/* error case */
- *errorCodePtr = Tcl_GetErrno();
+ if (errorCodePtr != NULL) {
+ *errorCodePtr = Tcl_GetErrno();
+ } else {
+ statePtr->error = Tcl_GetErrno();
+ }
return -1;
}
@@ -641,7 +652,11 @@ WaitForConnect(
* A non blocking socket waiting for an asyncronous connect
* returns directly an error
*/
- if ( noblock || (statePtr->flags & TCP_ASYNC_SOCKET) ) {
+ if ( errorCodePtr == NULL ) {
+ /* Backround operation */
+ return -1;
+ } else if (statePtr->flags & TCP_ASYNC_SOCKET) {
+ /* foreground operation but non blocking socket */
*errorCodePtr = EWOULDBLOCK;
return -1;
}
@@ -715,7 +730,7 @@ TcpInputProc(
* For a non blocking socket return EWOULDBLOCK if connect not terminated
*/
- if (WaitForConnect(statePtr, errorCodePtr, 0) != 0) {
+ if (WaitForConnect(statePtr, errorCodePtr) != 0) {
return -1;
}
@@ -844,7 +859,7 @@ TcpOutputProc(
* For a non blocking socket return EWOULDBLOCK if connect not terminated
*/
- if (WaitForConnect(statePtr, errorCodePtr, 0) != 0) {
+ if (WaitForConnect(statePtr, errorCodePtr) != 0) {
return -1;
}
@@ -1184,7 +1199,7 @@ TcpGetOptionProc(
char host[NI_MAXHOST], port[NI_MAXSERV];
SOCKET sock;
size_t len = 0;
- int errorCode;
+ int errorCode = 0;
int reverseDNS = 0;
#define SUPPRESS_RDNS_VAR "::tcl::unsupported::noReverseDNS"
@@ -1202,8 +1217,11 @@ TcpGetOptionProc(
return TCL_ERROR;
}
- /* Go one step in async connect */
- WaitForConnect(statePtr, &errorCode, 1);
+ /*
+ * Go one step in async connect
+ * If any error is thrown save it as backround error to report eventually below
+ */
+ WaitForConnect(statePtr, NULL);
sock = statePtr->sockets->fd;
if (optionName != NULL) {
@@ -1216,30 +1234,52 @@ TcpGetOptionProc(
/*
* Do not return any errors if async connect is running
*/
- if (! (statePtr->flags & TCP_ASYNC_CONNECT_REENTER_PENDING) ) {
- int optlen;
- int ret;
- DWORD err;
+ if ( ! (statePtr->flags & TCP_ASYNC_CONNECT_REENTER_PENDING) ) {
- /*
- * Populater the err Variable with a possix error
- */
- optlen = sizeof(int);
- ret = TclWinGetSockOpt(sock, SOL_SOCKET, SO_ERROR,
- (char *)&err, &optlen);
- /*
- * The error was not returned directly but should be
- * taken from WSA
- */
- if (ret == SOCKET_ERROR) {
- err = WSAGetLastError();
- }
- /*
- * Return error message
- */
- if (err) {
- TclWinConvertError(err);
- Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(Tcl_GetErrno()), -1);
+
+ if ( statePtr->flags & TCP_ASYNC_CONNECT_FAILED ) {
+
+ /*
+ * In case of a failed async connect, eventually report the
+ * connect error only once.
+ * Do not report the system error, as this comes again and again.
+ */
+
+ if ( statePtr->error != 0 ) {
+ Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(statePtr->error), -1);
+ statePtr->error = 0;
+ }
+
+ } else {
+
+ /*
+ * Report an eventual last error of the socket system
+ */
+
+ int optlen;
+ int ret;
+ DWORD err;
+
+ /*
+ * Populater the err Variable with a possix error
+ */
+ optlen = sizeof(int);
+ ret = TclWinGetSockOpt(sock, SOL_SOCKET, SO_ERROR,
+ (char *)&err, &optlen);
+ /*
+ * The error was not returned directly but should be
+ * taken from WSA
+ */
+ if (ret == SOCKET_ERROR) {
+ err = WSAGetLastError();
+ }
+ /*
+ * Return error message
+ */
+ if (err) {
+ TclWinConvertError(err);
+ Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(Tcl_GetErrno()), -1);
+ }
}
}
return TCL_OK;
@@ -2555,16 +2595,36 @@ SocketEventProc(
return 1;
}
+ /*
+ * Clear flag that (this) event is pending
+ */
+
statePtr->flags &= ~SOCKET_PENDING;
- /* Continue async connect if pending and ready */
+ /*
+ * Continue async connect if pending and ready
+ */
+
if ( statePtr->readyEvents & FD_CONNECT ) {
- statePtr->readyEvents &= ~(FD_CONNECT);
if ( statePtr->flags & TCP_ASYNC_CONNECT_REENTER_PENDING ) {
+
+ /*
+ * Do one step and save eventual connect error
+ */
+
+ SetEvent(tsdPtr->socketListLock);
+ WaitForConnect(statePtr,NULL);
+
+ } else {
+
+ /*
+ * No async connect reenter pending. Just clear event.
+ */
+
+ statePtr->readyEvents &= ~(FD_CONNECT);
SetEvent(tsdPtr->socketListLock);
- CreateClientSocket(NULL, statePtr);
- return 1;
}
+ return 1;
}
/*