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442
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1 /* I-connector utility
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2 Copyright (C) 2000 Kirill M. Katsnelson
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* When run with an argument, i treats it as a command line, and pipes
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22 command stdin, stdout and stderr to its own respective streams. How
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23 silly it should sound, but windowed program in Win32 cannot do output
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24 to the console from which it has been started, and should be run using
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25 this utility.
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26
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27 This utility is for running [tx]emacs as part of make process so that
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28 its output goes to the same console as the rest of the make output
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29 does. It can be used also when xemacs should be run as a batch
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30 command ina script, especially when its standart output should be
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31 obtained programmatically. */
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32
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33 #include <windows.h>
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34 #include <stdio.h>
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35 #include <string.h>
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36 #include <tchar.h>
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37
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38 typedef struct
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39 {
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40 HANDLE source;
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41 HANDLE drain;
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42 } I_connector;
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43
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44 /*
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45 * Make new handle as that pointed to by PH but
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46 * inheritable, substitute PH with it, and close the
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47 * original one
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48 */
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49 static void
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50 make_inheritable (HANDLE* ph)
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51 {
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52 HANDLE htmp;
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53 DuplicateHandle (GetCurrentProcess(), *ph, GetCurrentProcess(), &htmp,
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54 0, TRUE, DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS);
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55 *ph = htmp;
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56 }
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57
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58 /*
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59 * Worker thread proc. Reads source, pumps into drain,
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60 * till either clogs.
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61 */
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62 static DWORD CALLBACK
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63 pump (LPVOID pv_i)
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64 {
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65 I_connector* pi = (I_connector*) pv_i;
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66 BYTE buffer [256];
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67 DWORD really_read, unused;
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68
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69 while (ReadFile (pi->source, buffer, sizeof (buffer), &really_read, NULL) &&
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70 WriteFile (pi->drain, buffer, really_read, &unused, NULL))
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71 ;
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72
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73 return 0;
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74 }
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75
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76 /*
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77 * Launch a pump for the given I-connector
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78 */
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79 static void
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80 start_pump (I_connector* pi)
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81 {
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82 DWORD unused;
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83 HANDLE h_thread = CreateThread (NULL, 0, pump, (void*)pi, 0, &unused);
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84 CloseHandle (h_thread);
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85 }
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86
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87 /*
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88 * Get command line, skip over the executable name, return the rest.
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89 */
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90 static LPTSTR
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91 get_command (void)
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92 {
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93 LPTSTR cl = GetCommandLine ();
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94 int ix;
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95
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96 while (1)
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97 {
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98 ix = _tcscspn (cl, _T(" \t\""));
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99 if (cl[ix] == '\"')
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100 {
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101 cl = _tcschr (cl + ix + 1, '\"');
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102 if (cl == NULL)
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103 return NULL; /* Unmatched quote */
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104 cl++;
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105 }
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106 else
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107 {
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108 cl += ix;
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109 cl += _tcsspn (cl, _T(" \t"));
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110 return *cl ? cl : NULL;
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111 }
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112 }
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113 }
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114
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115 /*
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116 * Brew coffee and bring snickers
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117 */
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118 void
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119 usage (void)
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120 {
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121 fprintf (stderr,
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122 "\n"
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123 "usage: i command\n"
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124 "i executes the command and reroutes its standard handles to the calling\n"
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125 "console. Good for seeing output of GUI programs that use standard output."
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126 "\n");
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127 }
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128
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129 int
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130 main (void)
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131 {
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132 STARTUPINFO si;
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133 PROCESS_INFORMATION pi;
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134 I_connector I_in, I_out, I_err;
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135 DWORD exit_code;
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136
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137 LPTSTR command = get_command ();
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138 if (command == NULL)
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139 {
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140 usage ();
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141 return 1;
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142 }
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143
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144 ZeroMemory (&si, sizeof (si));
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145 si.dwFlags = STARTF_USESTDHANDLES;
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146
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147 I_in.source = GetStdHandle (STD_INPUT_HANDLE);
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148 CreatePipe (&si.hStdInput, &I_in.drain, NULL, 0);
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149 make_inheritable (&si.hStdInput);
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150
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151 I_out.drain = GetStdHandle (STD_OUTPUT_HANDLE);
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152 CreatePipe (&I_out.source, &si.hStdOutput, NULL, 0);
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153 make_inheritable (&si.hStdOutput);
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154
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155 I_err.drain = GetStdHandle (STD_ERROR_HANDLE);
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156 CreatePipe (&I_err.source, &si.hStdError, NULL, 0);
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157 make_inheritable (&si.hStdError);
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158
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159 if (CreateProcess (NULL, command, NULL, NULL, TRUE, 0,
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160 NULL, NULL, &si, &pi) == 0)
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161 {
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162 _ftprintf (stderr, _T("Error %d launching `%s'\n"),
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163 GetLastError (), command);
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164 return 2;
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165 }
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166
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167 CloseHandle (pi.hThread);
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168
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169 /* Start pump in each I-connector */
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170 start_pump (&I_in);
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171 start_pump (&I_out);
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172 start_pump (&I_err);
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173
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174 /* Wait for the process to complete */
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175 WaitForSingleObject (pi.hProcess, INFINITE);
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176 GetExitCodeProcess (pi.hProcess, &exit_code);
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177 CloseHandle (pi.hProcess);
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178
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179 /* Make pump threads eventually die out. Looks rude, I agree */
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180 CloseHandle (GetStdHandle (STD_INPUT_HANDLE));
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181 CloseHandle (GetStdHandle (STD_OUTPUT_HANDLE));
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182 CloseHandle (GetStdHandle (STD_ERROR_HANDLE));
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183
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184 return exit_code;
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185 }
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