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495 lines
11 KiB
495 lines
11 KiB
//
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// Tests resize of buffer.
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//
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include "windows.h"
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//
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// This program assumes that it is using a loopback connector.
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//
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#define MAX_CHECK 100000
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ULONG CheckValues[MAX_CHECK];
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ULONG ReadValues[MAX_CHECK];
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void main(int argc,char *argv[]) {
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HANDLE hFile;
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COMMPROP mp;
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DCB MyDcb;
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ULONG i;
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ULONG actuallyIoed;
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ULONG firstReadSize;
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ULONG secondReadSize;
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ULONG secondWriteSize;
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COMMTIMEOUTS cto;
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char *MyPort = "COM1";
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COMSTAT stat;
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DWORD errors;
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DWORD increment = 1066;
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DWORD baudRate = 19200;
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cto.ReadIntervalTimeout = (DWORD)~0;
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cto.ReadTotalTimeoutMultiplier = (DWORD)0;
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cto.ReadTotalTimeoutConstant = (DWORD)0;
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cto.WriteTotalTimeoutMultiplier = (DWORD)1;
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cto.WriteTotalTimeoutConstant = (DWORD)1000;
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if (argc > 1) {
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MyPort = argv[1];
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if (argc > 2) {
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sscanf(argv[2],"%d",&increment);
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if (argc > 3) {
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sscanf(argv[3],"%d",&baudRate);
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}
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}
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}
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//
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// Put a sequence number in each long. As an extra check
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// turn the high bit on.
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//
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for (
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i = 0;
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i < MAX_CHECK;
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i++
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) {
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CheckValues[i] = i;
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CheckValues[i] |= 0x80000000;
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}
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if ((hFile = 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,
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NULL
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)) == ((HANDLE)-1)) {
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printf("Couldn't open the port %s\n",MyPort);
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exit(1);
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}
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if (!GetCommState(
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hFile,
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&MyDcb
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)) {
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printf("We couldn't get the comm state\n");
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exit(1);
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}
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//
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// Set the baud to 19200 and the data bits to 8
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// (We want 8 so that we don't lose any of our data.)
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//
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MyDcb.BaudRate = baudRate;
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MyDcb.ByteSize = 8;
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if (!SetCommState(
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hFile,
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&MyDcb
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)) {
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printf("Couldn't set the baud/data for port %s\n");
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exit(1);
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}
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//
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// All the data should be in memory, we just set a timeout
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// so that if we do get hung up, the reads will return.
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//
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if (!SetCommTimeouts(
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hFile,
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&cto
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)) {
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printf("Couldn't set the timeouts.\n");
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exit(1);
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}
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//
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// Find out how many bytes are available in the RX buffer.
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//
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if (!GetCommProperties(
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hFile,
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&mp
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)) {
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printf("Couldn't get the properties for port %s\n",MyPort);
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exit(1);
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}
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while (mp.dwCurrentRxQueue <= (MAX_CHECK*sizeof(ULONG))) {
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printf("RX buffer size: %d\r",mp.dwCurrentRxQueue);
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//
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// Write out the number of bytes that the RX buffer can
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// hold.
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//
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// The we read in half (approximately) of those bytes. After
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// we read the half, we resize the buffer. We then read in
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// the rest of those bytes. We then check the values against
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// what they "should" be.
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//
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if (!WriteFile(
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hFile,
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&CheckValues[0],
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mp.dwCurrentRxQueue,
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&actuallyIoed,
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NULL
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)) {
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printf("\nDidn't get all of the characters written %d\n",actuallyIoed);
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exit(1);
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}
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if (actuallyIoed != mp.dwCurrentRxQueue) {
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printf("\nfirst write Timed out with IO of %d\n",actuallyIoed);
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exit(1);
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}
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Sleep(2);
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//
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// Call clear comm error so that we can see how many characters
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// are in the typeahead buffer.
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//
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if (!ClearCommError(
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hFile,
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&errors,
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&stat
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)) {
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printf("\nCouldn't call clear comm status after first write.\n");
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exit(1);
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}
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if (stat.cbInQue != mp.dwCurrentRxQueue) {
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printf("\nAfter first write the typeahead buffer is incorrect %d - %x\n",
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stat.cbInQue,errors);
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exit(1);
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}
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firstReadSize = mp.dwCurrentRxQueue / 2;
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secondReadSize = mp.dwCurrentRxQueue - firstReadSize;
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if (!ReadFile(
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hFile,
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&ReadValues[0],
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firstReadSize,
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&actuallyIoed,
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NULL
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)) {
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printf("\nDidn't get all of the characters read %d\n",actuallyIoed);
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exit(1);
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}
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if (actuallyIoed != firstReadSize) {
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printf("\nfirst read Timed out with IO of %d\n",actuallyIoed);
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exit(1);
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}
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Sleep(2);
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//
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// Call clear comm error so that we can see how many characters
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// are in the typeahead buffer.
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//
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if (!ClearCommError(
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hFile,
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&errors,
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&stat
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)) {
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printf("\nCouldn't call clear comm status after first read.\n");
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exit(1);
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}
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if (stat.cbInQue != secondReadSize) {
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printf("\nAfter first read the typeahead buffer is incorrect %d\n",
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stat.cbInQue);
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exit(1);
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}
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Sleep(100);
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mp.dwCurrentRxQueue += increment;
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if (!SetupComm(
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hFile,
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mp.dwCurrentRxQueue,
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mp.dwCurrentTxQueue
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)) {
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printf("\nCouldn't resize the buffer to %d\n",mp.dwCurrentRxQueue);
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exit(1);
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}
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Sleep(2);
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//
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// Call clear comm error so that we can see how many characters
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// are in the typeahead buffer.
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//
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if (!ClearCommError(
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hFile,
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&errors,
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&stat
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)) {
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printf("\nCouldn't call clear comm status after resize.\n");
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exit(1);
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}
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if (stat.cbInQue != secondReadSize) {
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printf("\nAfter resize the typeahead buffer is incorrect %d\n",
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stat.cbInQue);
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exit(1);
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}
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//
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// It's been resized. Fill up the remaining.
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//
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secondWriteSize = mp.dwCurrentRxQueue - secondReadSize;
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if (!WriteFile(
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hFile,
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&CheckValues[0],
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secondWriteSize,
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&actuallyIoed,
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NULL
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)) {
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printf("\nDidn't write all of the chars second time %d\n",actuallyIoed);
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exit(1);
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}
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if (actuallyIoed != secondWriteSize) {
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printf("\nsecond write Timed out with IO of %d\n",actuallyIoed);
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exit(1);
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}
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Sleep(2);
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//
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// Call clear comm error so that we can see how many characters
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// are in the typeahead buffer.
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//
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if (!ClearCommError(
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hFile,
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&errors,
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&stat
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)) {
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printf("\nCouldn't call clear comm status after resize.\n");
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exit(1);
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}
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if (stat.cbInQue != mp.dwCurrentRxQueue) {
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printf("\nAfter second write the typeahead buffer is incorrect %d\n",
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stat.cbInQue);
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exit(1);
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}
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//
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// We resized the buffer, see if we can get the rest of the
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// characters from the first write.
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//
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if (!ReadFile(
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hFile,
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((PUCHAR)&ReadValues[0])+firstReadSize,
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secondReadSize,
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&actuallyIoed,
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NULL
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)) {
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printf("\nDidn't get all of the characters read(2) %d\n",actuallyIoed);
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exit(1);
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}
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if (actuallyIoed != secondReadSize) {
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printf("\nsecond read Timed out with IO of %d\n",actuallyIoed);
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exit(1);
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}
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Sleep(2);
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//
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// Call clear comm error so that we can see how many characters
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// are in the typeahead buffer.
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//
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if (!ClearCommError(
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hFile,
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&errors,
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&stat
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)) {
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printf("\nCouldn't call clear comm status after resize.\n");
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exit(1);
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}
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if (stat.cbInQue != secondWriteSize) {
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printf("\nAfter second read the typeahead buffer is incorrect %d\n",
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stat.cbInQue);
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exit(1);
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}
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//
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// Now check that what we read was what we sent.
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//
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for (
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i = 0;
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i < (((firstReadSize+secondReadSize)+(sizeof(DWORD)-1)) / sizeof(DWORD)) - 1;
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i++
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) {
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if (ReadValues[i] != CheckValues[i]) {
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printf("\nAt index %d - values are read %x - check %x\n",
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i,ReadValues[i],CheckValues[i]);
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exit(1);
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}
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}
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//
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// Get the chars we wrote on the second write and make
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// sure that they are good also.
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//
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if (!ReadFile(
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hFile,
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&ReadValues[0],
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secondWriteSize,
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&actuallyIoed,
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NULL
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)) {
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printf("\nDidn't get all of the characters read(3) %d\n",actuallyIoed);
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exit(1);
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}
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if (actuallyIoed != secondWriteSize) {
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printf("\nthird read Timed out with IO of %d\n",actuallyIoed);
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exit(1);
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}
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Sleep(2);
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//
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// Call clear comm error so that we can see how many characters
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// are in the typeahead buffer.
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//
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if (!ClearCommError(
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hFile,
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&errors,
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&stat
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)) {
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printf("\nCouldn't call clear comm status after resize.\n");
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exit(1);
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}
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if (stat.cbInQue) {
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printf("\nAfter second read the typeahead buffer is incorrect %d\n",
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stat.cbInQue);
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exit(1);
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}
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//
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// Now check that what we read was what we sent.
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//
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for (
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i = 0;
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i < ((secondWriteSize+(sizeof(DWORD)-1)) / sizeof(DWORD)) - 1;
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i++
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) {
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if (ReadValues[i] != CheckValues[i]) {
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printf("\nAt on read(3) index %d - values are read %x - check %x\n",
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i,ReadValues[i],CheckValues[i]);
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exit(1);
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}
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}
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}
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}
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