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