Source code of Windows XP (NT5)
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183 lines
3.6 KiB

//
// Test the quick return timeouts
//
// Assume that we are using a loopback connector.
//
// Assume that it isn't running on a stressed machine.
//
#include "windows.h"
#include "stdio.h"
#define FAILURE printf("FAIL: %d\n",__LINE__);exit(1)
int __cdecl main(int argc, char *argv[]) {
CHAR *myPort = "COM1";
DCB myDcb;
DWORD junk;
COMMTIMEOUTS myTimeOuts;
DWORD numberActuallyRead;
DWORD numberActuallyWritten;
UCHAR readBuff[1000];
HANDLE comHandle;
DWORD startingTicks;
OVERLAPPED readOl;
OVERLAPPED writeOl;
UCHAR writeBuff[5] = {0,1,2,3,4};
if (argc > 1) {
myPort = argv[1];
}
if ((comHandle = CreateFile(
myPort,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
NULL
)) == ((HANDLE)-1)) {
FAILURE;
}
if (!(readOl.hEvent = CreateEvent(
NULL,
TRUE,
FALSE,
NULL
))) {
FAILURE;
}
if (!GetCommState(
comHandle,
&myDcb
)) {
FAILURE;
}
myDcb.BaudRate = 19200;
myDcb.ByteSize = 8;
myDcb.StopBits = ONESTOPBIT;
myDcb.Parity = NOPARITY;
myDcb.fOutxCtsFlow = FALSE;
myDcb.fOutxDsrFlow = FALSE;
myDcb.fDsrSensitivity = FALSE;
myDcb.fOutX = FALSE;
myDcb.fInX = FALSE;
myDcb.fRtsControl = RTS_CONTROL_ENABLE;
myDcb.fDtrControl = DTR_CONTROL_ENABLE;
if (!SetCommState(
comHandle,
&myDcb
)) {
FAILURE;
}
//
// Make sure that the IO doesn't time out.
//
myTimeOuts.ReadIntervalTimeout = 0;
myTimeOuts.ReadTotalTimeoutMultiplier = 0;
myTimeOuts.ReadTotalTimeoutConstant = 0;
myTimeOuts.WriteTotalTimeoutMultiplier = 0;
myTimeOuts.WriteTotalTimeoutConstant = 0;
if (!SetCommTimeouts(
comHandle,
&myTimeOuts
)) {
FAILURE;
}
//
// Start off a read. It shouldn't complete
//
if (!ReadFile(
comHandle,
&readBuff[0],
1000,
&numberActuallyRead,
&readOl
)) {
if (GetLastError() != ERROR_IO_PENDING) {
FAILURE;
}
if (GetOverlappedResult(
comHandle,
&readOl,
&numberActuallyRead,
FALSE
)) {
FAILURE;
}
} else {
FAILURE;
}
//
// The read should still be there. Now do a purge comm. We
// should then do a sleep for 2 seconds to give the read time
// to complete. Then we should first make sure that the
// read has completed (via a get overlapped). Then we should
// do a SetupComm (with a "large" value so that we will actually
// allocate a new typeahead buffer). If there is still a "dangling"
// read, then we should never return from SetupComm.
//
if (!PurgeComm(
comHandle,
PURGE_TXABORT | PURGE_RXABORT
)) {
FAILURE;
}
if (WaitForSingleObject(
readOl.hEvent,
2000
) != WAIT_OBJECT_0) {
FAILURE;
}
if (!SetupComm(
comHandle,
20000,
20000
)) {
FAILURE;
}
return 1;
}