Source code of Windows XP (NT5)
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348 lines
6.8 KiB

#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "windows.h"
HANDLE WaitEvent;
HANDLE ReadEvent;
HANDLE hFile;
HANDLE IoSemaphore;
DWORD
WaitCommThread(
LPVOID Trash
)
{
DWORD ReasonSatisfied;
DWORD Trash2;
OVERLAPPED Ol;
UNREFERENCED_PARAMETER(Trash);
Ol.hEvent = WaitEvent;
do {
if (!WaitCommEvent(
hFile,
&ReasonSatisfied,
&Ol
)) {
DWORD LastError = GetLastError();
if (LastError == ERROR_IO_PENDING) {
if (!GetOverlappedResult(
hFile,
&Ol,
&Trash2,
TRUE
)) {
WaitForSingleObject(IoSemaphore,-1);
printf("Could not do the getoverlapped on the wait: %d\n",GetLastError());
ReleaseSemaphore(IoSemaphore,1,NULL);
}
} else {
WaitForSingleObject(IoSemaphore,-1);
printf("Could not start the wait: %d\n",LastError);
ReleaseSemaphore(IoSemaphore,1,NULL);
}
}
} while (TRUE);
return 1;
}
DWORD
SetMaskThread(
LPVOID Trash
)
{
UNREFERENCED_PARAMETER(Trash);
do {
//
// Now clear.
//
Sleep(1000);
if (!SetCommMask(
hFile,
0
)) {
DWORD LastError = GetLastError();
WaitForSingleObject(IoSemaphore,-1);
printf("Could not initiate the 0 set mask: %d\n",LastError);
ReleaseSemaphore(IoSemaphore,1,NULL);
}
//
// Now set.
//
Sleep(1000);
if (!SetCommMask(
hFile,
EV_RXCHAR
)) {
DWORD LastError = GetLastError();
WaitForSingleObject(IoSemaphore,-1);
printf("Could not initiate the EV_RXCHAR set mask: %d\n",LastError);
ReleaseSemaphore(IoSemaphore,1,NULL);
}
} while (TRUE);
return 1;
}
DWORD
ReadThread(
LPVOID Trash
)
{
DWORD Trash2;
OVERLAPPED Ol;
char readbuff[100];
DWORD NumberActuallyRead;
DWORD NumberToRead = 100;
UNREFERENCED_PARAMETER(Trash);
Ol.hEvent = ReadEvent;
do {
Sleep(200);
if (!ReadFile(
hFile,
readbuff,
NumberToRead,
&NumberActuallyRead,
&Ol
)) {
DWORD LastError = GetLastError();
if (LastError == ERROR_IO_PENDING) {
if (!GetOverlappedResult(
hFile,
&Ol,
&Trash2,
TRUE
)) {
WaitForSingleObject(IoSemaphore,-1);
printf("Could not do the getoverlapped on the read: %d\n",GetLastError());
ReleaseSemaphore(IoSemaphore,1,NULL);
}
} else {
WaitForSingleObject(IoSemaphore,-1);
printf("Could not start the wait: %d\n",LastError);
ReleaseSemaphore(IoSemaphore,1,NULL);
}
}
} while (TRUE);
return 1;
}
int __cdecl main(int argc,char *argv[]) {
char *MyPort = "COM1";
DWORD ValueFromEscape = 0;
DWORD CharFunc;
DWORD ThreadId;
DWORD ReadThreadId;
HANDLE ReadHandle;
int scanfval;
if (argc > 1) {
MyPort = argv[1];
}
WaitEvent = CreateEvent(
NULL,
TRUE,
FALSE,
NULL
);
if (!WaitEvent) {
printf("Wait Event could not be created\n");
exit(1);
}
ReadEvent = CreateEvent(
NULL,
TRUE,
FALSE,
NULL
);
if (!ReadEvent) {
printf("Read Event could not be created\n");
exit(1);
}
IoSemaphore = CreateSemaphore(
NULL,
1,
1,
NULL
);
if (!IoSemaphore) {
printf("IoSemaphore could not be created\n");
exit(1);
}
if ((hFile = CreateFile(
MyPort,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
NULL
)) != ((HANDLE)-1)) {
DCB MyDcb;
COMMTIMEOUTS NewTimeouts;
printf("We successfully opened the %s port.\n",MyPort);
//
// We've successfully opened the file. Set the state of
// the comm device. First we get the old values and
// adjust to our own.
//
if (!GetCommState(
hFile,
&MyDcb
)) {
printf("Couldn't get the comm state: %d\n",GetLastError());
exit(1);
}
MyDcb.BaudRate = 19200;
MyDcb.ByteSize = 8;
MyDcb.Parity = NOPARITY;
MyDcb.StopBits = ONESTOPBIT;
MyDcb.EvtChar = 'a';
if (!SetCommState(
hFile,
&MyDcb
)) {
printf("Couldn't set the comm state: %d\n",GetLastError());
exit(1);
}
if (!SetCommTimeouts(
hFile,
&NewTimeouts
)) {
printf("Couldn't set the comm timeouts: %d\n",GetLastError());
exit(1);
}
} else {
printf("Could not open the comm port: %d\n",GetLastError());
}
//
// Create the thread that will wait for the
// comm events.
//
if (!CreateThread(
NULL,
0,
WaitCommThread,
NULL,
0,
&ThreadId
)) {
printf("Could not create the wait thread.\n");
exit(1);
}
if (!CreateThread(
NULL,
0,
SetMaskThread,
NULL,
0,
&ThreadId
)) {
printf("Could not create the set mask thread.\n");
exit(1);
}
if ((ReadHandle = CreateThread(
NULL,
0,
ReadThread,
NULL,
0,
&ThreadId
)) == 0) {
printf("Could not create the read thread.\n");
exit(1);
}
WaitForSingleObject(ReadHandle,-1);
}