TestCommConfig.c

 
#include <sys/stat.h>
 
#include <winpr/crt.h>
#include <winpr/comm.h>
#include <winpr/file.h>
#include <winpr/synch.h>
#include <winpr/handle.h>
 
int TestCommConfig(int argc, char* argv[])
{
  DCB dcb = { 0 };
  BOOL success = FALSE;
  LPCSTR lpFileName = "\\\\.\\COM1";
  COMMPROP commProp = { 0 };
  struct stat statbuf = { 0 };
 
  HANDLE hComm =
      CreateFileA(lpFileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 
  if (hComm && (hComm != INVALID_HANDLE_VALUE))
  {
    (void)fprintf(
        stderr, "CreateFileA failure: could create a handle on a not yet defined device: %s\n",
        lpFileName);
    return EXIT_FAILURE;
  }
 
  if (stat("/dev/ttyS0", &statbuf) < 0)
  {
    (void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
    return EXIT_SUCCESS;
  }
 
  success = DefineCommDevice(lpFileName, "/dev/ttyS0");
  if (!success)
  {
    (void)fprintf(stderr, "DefineCommDevice failure: %s\n", lpFileName);
    return EXIT_FAILURE;
  }
 
  hComm = CreateFileA(lpFileName, GENERIC_READ | GENERIC_WRITE,
                      FILE_SHARE_WRITE, /* invalid parameter */
                      NULL, CREATE_NEW, /* invalid parameter */
                      0, (HANDLE)1234); /* invalid parameter */
  if (hComm != INVALID_HANDLE_VALUE)
  {
    (void)fprintf(
        stderr, "CreateFileA failure: could create a handle with some invalid parameters %s\n",
        lpFileName);
    return EXIT_FAILURE;
  }
 
  hComm = CreateFileA(lpFileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 
  if (!hComm || (hComm == INVALID_HANDLE_VALUE))
  {
    (void)fprintf(stderr, "CreateFileA failure: %s GetLastError() = 0x%08x\n", lpFileName,
                  GetLastError());
    return EXIT_FAILURE;
  }
 
  /* TODO: a second call to CreateFileA should failed and
   * GetLastError should return ERROR_SHARING_VIOLATION */
 
  dcb.DCBlength = sizeof(DCB);
  success = GetCommState(hComm, &dcb);
  if (!success)
  {
    (void)fprintf(stderr, "GetCommState failure: GetLastError() = Ox%x\n", GetLastError());
    return EXIT_FAILURE;
  }
 
  (void)fprintf(stderr,
                "BaudRate: %" PRIu32 " ByteSize: %" PRIu8 " Parity: %" PRIu8 " StopBits: %" PRIu8
                "\n",
                dcb.BaudRate, dcb.ByteSize, dcb.Parity, dcb.StopBits);
 
  if (!GetCommProperties(hComm, &commProp))
  {
    (void)fprintf(stderr, "GetCommProperties failure: GetLastError(): 0x%08x\n",
                  GetLastError());
    return EXIT_FAILURE;
  }
 
  if ((commProp.dwSettableBaud & BAUD_57600) <= 0)
  {
    (void)fprintf(stderr, "BAUD_57600 unsupported!\n");
    return EXIT_FAILURE;
  }
 
  if ((commProp.dwSettableBaud & BAUD_14400) > 0)
  {
    (void)fprintf(stderr, "BAUD_14400 supported!\n");
    return EXIT_FAILURE;
  }
 
  dcb.BaudRate = CBR_57600;
  dcb.ByteSize = 8;
  dcb.Parity = NOPARITY;
  dcb.StopBits = ONESTOPBIT;
 
  success = SetCommState(hComm, &dcb);
 
  if (!success)
  {
    (void)fprintf(stderr, "SetCommState failure: GetLastError() = 0x%x\n", GetLastError());
    return EXIT_FAILURE;
  }
 
  success = GetCommState(hComm, &dcb);
 
  if (!success)
  {
    (void)fprintf(stderr, "GetCommState failure: GetLastError() = 0x%x\n", GetLastError());
    return 0;
  }
 
  if ((dcb.BaudRate != CBR_57600) || (dcb.ByteSize != 8) || (dcb.Parity != NOPARITY) ||
      (dcb.StopBits != ONESTOPBIT))
  {
    (void)fprintf(stderr,
                  "Got an unexpected value among: BaudRate: %" PRIu32 " ByteSize: %" PRIu8
                  " Parity: %" PRIu8 " StopBits: %" PRIu8 "\n",
                  dcb.BaudRate, dcb.ByteSize, dcb.Parity, dcb.StopBits);
  }
 
  (void)CloseHandle(hComm);
 
  return 0;
}