1 | #define BUFSIZE 4096
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2 |
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3 | HANDLE rPipe = NULL;
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4 | HANDLE wPipe = NULL;
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5 | char chBuf[BUFSIZE];
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6 |
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7 | int
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8 | JExecute(
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9 | char *cmd
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10 | )
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11 | {
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12 | SECURITY_ATTRIBUTES saAttr;
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13 | PROCESS_INFORMATION piProcInfo;
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14 | STARTUPINFO siStartInfo;
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15 | BOOL bSuccess;
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16 | int code = 255;
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17 |
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18 | fprintf( fprt, "\n executing %s", cmd);
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19 | *chBuf = 0;
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20 |
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21 | // Set the bInheritHandle flag so pipe handles are inherited
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22 | saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
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23 | saAttr.bInheritHandle = TRUE;
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24 | saAttr.lpSecurityDescriptor = NULL;
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25 |
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26 | // Create a pipe for the child process's STDOUT
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27 | if ( ! CreatePipe(&rPipe, &wPipe, &saAttr, 0))
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28 | ExitError( "uimpxml", "CreatePipe() - pipe for child process\'s STDOUT failed");
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29 |
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30 | // Ensure the read handle to the pipe for STDOUT is not inherited
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31 | if ( ! SetHandleInformation(rPipe, HANDLE_FLAG_INHERIT, 0))
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32 | ExitError( "uimpxml", "SetHandleInformation() - pipe STDOUT read handle failed for inheritance");
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33 |
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34 | ZeroMemory(&piProcInfo, sizeof(PROCESS_INFORMATION));
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35 |
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36 | ZeroMemory( &siStartInfo, sizeof( STARTUPINFO));
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37 | siStartInfo.cb = sizeof( STARTUPINFO);
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38 | siStartInfo.hStdError = wPipe;
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39 | siStartInfo.hStdOutput = wPipe;
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40 | siStartInfo.hStdInput = NULL;
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41 | siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
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42 |
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43 | // Create the child process
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44 | bSuccess = CreateProcess(
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45 | NULL, // Use szCmdLine
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46 | cmd, // command line
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47 | NULL, // process security attributes
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48 | NULL, // primary thread security attributes
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49 | TRUE, // handles are inherited
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50 | 0, // creation flags
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51 | NULL, // use parent's environment
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52 | NULL, // use parent's current directory
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53 | &siStartInfo, // STARTUPINFO pointer
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54 | &piProcInfo); // receives PROCESS_INFORMATION
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55 |
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56 | if ( bSuccess) {
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57 | WaitForSingleObject( piProcInfo.hProcess, INFINITE);
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58 | GetExitCodeProcess( piProcInfo.hProcess, (LPDWORD) &code);
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59 | CloseHandle( piProcInfo.hProcess);
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60 | CloseHandle( piProcInfo.hThread);
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61 | }
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62 |
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63 | ReadFromPipe();
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64 |
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65 | CloseHandle( rPipe);
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66 | CloseHandle( wPipe);
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67 |
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68 | return code;
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69 | }
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70 |
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71 | // Read output from the child process's pipe for STDOUT and
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72 | // write to the parent process's pipe for STDOUT. Stop when
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73 | // there is no more data.
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74 |
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75 | void
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76 | ReadFromPipe()
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77 | {
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78 | DWORD dwRead;
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79 | BOOL bSuccess = FALSE;
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80 | int i;
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81 |
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82 | CloseHandle( wPipe);
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83 |
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84 | fprintf( fprt, "\n > ");
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85 | for( ; ; ) {
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86 | bSuccess = ReadFile( rPipe, chBuf, BUFSIZE, &dwRead, NULL);
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87 | if(!bSuccess || dwRead == 0)
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88 | break;
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89 | for ( i=0; i<dwRead; i++){
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90 | switch ( chBuf[i]) {
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91 | case '\r':
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92 | break;
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93 | case '\n':
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94 | fprintf( fprt, "\n > ");
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95 | break;
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96 | default : ;
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97 | fputc( chBuf[i], fprt);
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98 | }
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99 | }
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100 | }
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101 | }
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