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-rw-r--r--mac/tclMacSock.c32
1 files changed, 30 insertions, 2 deletions
diff --git a/mac/tclMacSock.c b/mac/tclMacSock.c
index d387cb5..ff627ec 100644
--- a/mac/tclMacSock.c
+++ b/mac/tclMacSock.c
@@ -8,7 +8,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclMacSock.c,v 1.4 1999/04/16 00:47:21 stanton Exp $
+ * RCS: @(#) $Id: tclMacSock.c,v 1.5 1999/08/10 04:21:55 jingham Exp $
*/
#include "tclInt.h"
@@ -82,6 +82,9 @@ typedef struct TcpState {
rdsEntry rdsarray[5+1]; /* Array used when cleaning out recieve
* buffers on a closing socket. */
Tcl_Channel channel; /* Channel associated with this socket. */
+ int writeBufferSize; /* Size of buffer to hold data for
+ * asynchronous writes. */
+ void *writeBuffer; /* Buffer for async write data. */
struct TcpState *nextPtr; /* The next socket on the global socket
* list. */
} TcpState;
@@ -1226,8 +1229,26 @@ TcpOutput(
if (toWrite < amount) {
amount = toWrite;
}
+
+ /* We need to copy the data, otherwise the caller may overwrite
+ * the buffer in the middle of our asynchronous call
+ */
+
+ if (amount > statePtr->writeBufferSize) {
+ /*
+ * need to grow write buffer
+ */
+
+ if (statePtr->writeBuffer != (void *) NULL) {
+ ckfree(statePtr->writeBuffer);
+ }
+ statePtr->writeBuffer = (void *) ckalloc(amount);
+ statePtr->writeBufferSize = amount;
+ }
+ memcpy(statePtr->writeBuffer, buf, amount);
+ statePtr->dataSegment[0].ptr = statePtr->writeBuffer;
+
statePtr->dataSegment[0].length = amount;
- statePtr->dataSegment[0].ptr = buf;
statePtr->dataSegment[1].length = 0;
InitMacTCPParamBlock(&statePtr->pb, TCPSend);
statePtr->pb.ioCompletion = completeUPP;
@@ -1496,6 +1517,8 @@ NewSocketInfo(
statePtr->watchMask = 0;
statePtr->acceptProc = (Tcl_TcpAcceptProc *) NULL;
statePtr->acceptProcData = (ClientData) NULL;
+ statePtr->writeBuffer = (void *) NULL;
+ statePtr->writeBufferSize = 0;
statePtr->nextPtr = tsdPtr->socketList;
tsdPtr->socketList = statePtr;
return statePtr;
@@ -1535,6 +1558,11 @@ FreeSocketInfo(
}
}
}
+
+ if (statePtr->writeBuffer != (void *) NULL) {
+ ckfree(statePtr->writeBuffer);
+ }
+
ckfree((char *) statePtr);
}