152 lines
2.9 KiB
C
152 lines
2.9 KiB
C
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#include "stdio.h"
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#include "windows.h"
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void getlpt1timeout(void) {
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HANDLE hFile;
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COMMTIMEOUTS To = {0};
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if ((hFile = CreateFile(
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"LPT1",
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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 LPT1\n");
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exit(1);
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}
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if (!GetCommTimeouts(
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hFile,
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&To
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)) {
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printf("Couldn't get the timeouts: %d\n",GetLastError());
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exit(1);
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}
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printf("WriteTotalTimeout: %d\n",To.WriteTotalTimeoutConstant);
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CloseHandle(hFile);
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}
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void setlpt1timeout(int milliseconds) {
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HANDLE hFile;
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COMMTIMEOUTS To = {0};
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if ((hFile = CreateFile(
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"LPT1",
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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 LPT1\n");
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exit(1);
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}
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To.WriteTotalTimeoutConstant = milliseconds;
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if (!SetCommTimeouts(
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hFile,
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&To
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)) {
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printf("Couldn't set the timeouts: %d\n",GetLastError());
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}
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if (!GetCommTimeouts(
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hFile,
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&To
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)) {
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printf("Couldn't get the timeouts: %d\n",GetLastError());
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exit(1);
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} else {
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printf("Timeouts are now: %d\n",To.WriteTotalTimeoutConstant);
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}
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CloseHandle(hFile);
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}
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int _CRTAPI1 main(int argc,char *argv[]) {
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DWORD start,end;
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//
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// Get the current value of the timeouts.
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//
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getlpt1timeout();
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//
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// Set it to an illegal value.
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//
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setlpt1timeout(1999);
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//
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// Now set it to 10 seconds.
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//
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setlpt1timeout(10000);
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getlpt1timeout();
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start = GetCurrentTime();
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if (CopyFile("ttimeout.exe","LPT1",FALSE)) {
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printf("ACK!!! The copy succeeded\n");
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exit(1);
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}
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end = GetCurrentTime();
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printf("Number of millis to fail: %d\n",end-start);
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//
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// Now set it to 20 seconds.
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//
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setlpt1timeout(20000);
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getlpt1timeout();
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start = GetCurrentTime();
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if (CopyFile("ttimeout.exe","LPT1",FALSE)) {
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printf("ACK!!! The copy succeeded\n");
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exit(1);
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}
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end = GetCurrentTime();
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printf("Number of millis to fail: %d\n",end-start);
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//
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// Now set it back to 10 seconds.
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//
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setlpt1timeout(10000);
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getlpt1timeout();
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start = GetCurrentTime();
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if (CopyFile("ttimeout.exe","LPT1",FALSE)) {
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printf("ACK!!! The copy succeeded\n");
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exit(1);
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}
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end = GetCurrentTime();
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printf("Number of millis to fail: %d\n",end-start);
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return 1;
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}
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