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annotate lib-src/i.c @ 5924:518bf1108435 cygwin
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| author | Henry Thompson <ht@markup.co.uk> |
|---|---|
| date | Fri, 06 Feb 2015 09:08:37 +0000 |
| parents | 308d34e9f07d |
| children | e2fae7783046 |
| rev | line source |
|---|---|
| 442 | 1 /* I-connector utility |
| 2 Copyright (C) 2000 Kirill M. Katsnelson | |
| 1346 | 3 Copyright (C) 2002, 2003 Ben Wing. |
| 442 | 4 |
| 5 This file is part of XEmacs. | |
| 6 | |
|
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7 XEmacs is free software: you can redistribute it and/or modify it |
| 442 | 8 under the terms of the GNU General Public License as published by the |
|
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9 Free Software Foundation, either version 3 of the License, or (at your |
|
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10 option) any later version. |
| 442 | 11 |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
|
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 442 | 19 |
| 20 /* When run with an argument, i treats it as a command line, and pipes | |
| 21 command stdin, stdout and stderr to its own respective streams. How | |
| 22 silly it should sound, but windowed program in Win32 cannot do output | |
| 23 to the console from which it has been started, and should be run using | |
| 24 this utility. | |
| 25 | |
| 26 This utility is for running [tx]emacs as part of make process so that | |
| 27 its output goes to the same console as the rest of the make output | |
| 28 does. It can be used also when xemacs should be run as a batch | |
| 29 command ina script, especially when its standart output should be | |
| 30 obtained programmatically. */ | |
| 31 | |
| 2993 | 32 #ifdef HAVE_CONFIG_H |
| 33 # include <config.h> | |
| 34 #endif | |
| 35 | |
| 442 | 36 #include <windows.h> |
| 37 #include <stdio.h> | |
| 38 #include <string.h> | |
| 39 #include <tchar.h> | |
| 40 | |
| 41 typedef struct | |
| 42 { | |
| 43 HANDLE source; | |
| 44 HANDLE drain; | |
| 45 } I_connector; | |
| 46 | |
| 47 /* | |
| 48 * Make new handle as that pointed to by PH but | |
| 49 * inheritable, substitute PH with it, and close the | |
| 50 * original one | |
| 51 */ | |
| 52 static void | |
| 53 make_inheritable (HANDLE* ph) | |
| 54 { | |
| 55 HANDLE htmp; | |
| 56 DuplicateHandle (GetCurrentProcess(), *ph, GetCurrentProcess(), &htmp, | |
| 57 0, TRUE, DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS); | |
| 58 *ph = htmp; | |
| 59 } | |
| 60 | |
| 61 /* | |
| 62 * Worker thread proc. Reads source, pumps into drain, | |
| 63 * till either clogs. | |
| 64 */ | |
| 65 static DWORD CALLBACK | |
| 66 pump (LPVOID pv_i) | |
| 67 { | |
| 68 I_connector* pi = (I_connector*) pv_i; | |
| 69 BYTE buffer [256]; | |
| 70 DWORD really_read, unused; | |
| 71 | |
| 2426 | 72 /* I said: |
| 73 | |
| 74 [[ The docs for ReadFile claim: | |
| 1346 | 75 |
| 76 The ReadFile function returns when one of the following is true: a write | |
| 77 operation completes on the write end of the pipe, the number of bytes | |
| 78 requested has been read, or an error occurs. | |
| 79 | |
| 80 But this is just not true. ReadFile never seems to block, and unless we | |
| 2426 | 81 Sleep(), we will chew up all the CPU time. --ben ]] |
| 82 | |
| 83 But in fact | |
| 84 | |
| 85 [a] this does not appear to be the case any more [maybe a temporary | |
| 86 bug in some versions of Win2000?] | |
| 87 [b] it causes data lossage. [#### Why should this be? Seems extremely | |
| 88 fishy. I tried commenting out the calls to close the standard | |
| 89 handles at the bottom of the program, but it made no difference. | |
| 90 Would we need some kind of additional handshaking? If we get | |
| 91 data loss with the sleep, then we are a race condition waiting | |
| 92 to happen. */ | |
| 442 | 93 while (ReadFile (pi->source, buffer, sizeof (buffer), &really_read, NULL) && |
| 94 WriteFile (pi->drain, buffer, really_read, &unused, NULL)) | |
| 2426 | 95 /* Sleep (100) */ ; |
| 442 | 96 |
| 97 return 0; | |
| 98 } | |
| 99 | |
| 100 /* | |
| 101 * Launch a pump for the given I-connector | |
| 102 */ | |
| 103 static void | |
| 104 start_pump (I_connector* pi) | |
| 105 { | |
| 106 DWORD unused; | |
| 107 HANDLE h_thread = CreateThread (NULL, 0, pump, (void*)pi, 0, &unused); | |
| 108 CloseHandle (h_thread); | |
| 109 } | |
| 110 | |
| 826 | 111 static HANDLE external_event; |
| 112 | |
| 113 static BOOL | |
| 114 ctrl_c_handler (unsigned long type) | |
| 115 { | |
| 116 SetEvent (external_event); | |
| 117 return FALSE; | |
| 118 } | |
| 119 | |
| 120 /* Skip over the executable name in the given command line. Correctly | |
| 121 handles quotes in the name. Return NULL upon error. If | |
| 122 REQUIRE_FOLLOWING is non-zero, it's an error if no argument follows the | |
| 123 executable name. */ | |
| 124 | |
| 442 | 125 static LPTSTR |
| 826 | 126 skip_executable_name (LPTSTR cl, int require_following) |
| 442 | 127 { |
| 128 int ix; | |
| 129 | |
| 130 while (1) | |
| 131 { | |
| 132 ix = _tcscspn (cl, _T(" \t\"")); | |
| 133 if (cl[ix] == '\"') | |
| 134 { | |
| 135 cl = _tcschr (cl + ix + 1, '\"'); | |
| 136 if (cl == NULL) | |
| 137 return NULL; /* Unmatched quote */ | |
| 138 cl++; | |
| 139 } | |
| 140 else | |
| 141 { | |
| 142 cl += ix; | |
| 143 cl += _tcsspn (cl, _T(" \t")); | |
| 826 | 144 if (!require_following) |
| 145 return cl; | |
| 442 | 146 return *cl ? cl : NULL; |
| 147 } | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 /* | |
| 152 * Brew coffee and bring snickers | |
| 153 */ | |
| 154 void | |
| 155 usage (void) | |
| 156 { | |
| 157 fprintf (stderr, | |
| 158 "\n" | |
| 159 "usage: i command\n" | |
| 160 "i executes the command and reroutes its standard handles to the calling\n" | |
| 161 "console. Good for seeing output of GUI programs that use standard output." | |
| 162 "\n"); | |
| 163 } | |
| 164 | |
| 165 int | |
| 166 main (void) | |
| 167 { | |
| 168 STARTUPINFO si; | |
| 169 PROCESS_INFORMATION pi; | |
| 170 I_connector I_in, I_out, I_err; | |
| 171 DWORD exit_code; | |
| 826 | 172 LPTSTR command = skip_executable_name (GetCommandLine (), 1); |
| 173 | |
| 442 | 174 if (command == NULL) |
| 175 { | |
| 176 usage (); | |
| 177 return 1; | |
| 178 } | |
| 179 | |
| 180 ZeroMemory (&si, sizeof (si)); | |
| 181 si.dwFlags = STARTF_USESTDHANDLES; | |
| 182 | |
| 183 I_in.source = GetStdHandle (STD_INPUT_HANDLE); | |
| 184 CreatePipe (&si.hStdInput, &I_in.drain, NULL, 0); | |
| 185 make_inheritable (&si.hStdInput); | |
| 186 | |
| 187 I_out.drain = GetStdHandle (STD_OUTPUT_HANDLE); | |
| 188 CreatePipe (&I_out.source, &si.hStdOutput, NULL, 0); | |
| 189 make_inheritable (&si.hStdOutput); | |
| 190 | |
| 191 I_err.drain = GetStdHandle (STD_ERROR_HANDLE); | |
| 192 CreatePipe (&I_err.source, &si.hStdError, NULL, 0); | |
| 193 make_inheritable (&si.hStdError); | |
| 194 | |
| 826 | 195 { |
| 196 SECURITY_ATTRIBUTES sa; | |
| 197 LPTSTR new_command = | |
| 198 (LPTSTR) malloc (666 + sizeof (TCHAR) * _tcslen (command)); | |
| 199 LPTSTR past_exe; | |
| 200 | |
| 201 if (!new_command) | |
| 202 { | |
| 203 _ftprintf (stderr, _T ("Out of memory when launching `%s'\n"), | |
| 204 command); | |
| 205 return 2; | |
| 206 } | |
| 207 | |
| 208 past_exe = skip_executable_name (command, 0); | |
| 209 if (!past_exe) | |
| 210 { | |
| 211 usage (); | |
| 212 return 1; | |
| 213 } | |
| 214 | |
| 215 /* Since XEmacs isn't a console application, it can't easily be | |
| 216 terminated using ^C. Therefore, we set up a communication path with | |
| 217 it so that when a ^C is sent to us (using GenerateConsoleCtrlEvent), | |
| 218 we in turn signals it to commit suicide. (This is cleaner than using | |
| 219 TerminateProcess()). This makes (e.g.) the "Stop Build" command | |
| 220 from VC++ correctly terminate XEmacs. | |
| 221 | |
| 222 #### This will cause problems if i.exe is used for commands other | |
| 223 than XEmacs. We need to make behavior this a command-line | |
| 224 option. */ | |
| 442 | 225 |
| 826 | 226 /* Create the event as inheritable so that we can use it to communicate |
| 227 with the child process */ | |
| 228 sa.nLength = sizeof (sa); | |
| 229 sa.bInheritHandle = TRUE; | |
| 230 sa.lpSecurityDescriptor = NULL; | |
| 231 external_event = CreateEvent (&sa, FALSE, FALSE, NULL); | |
| 232 if (!external_event) | |
| 233 { | |
| 234 _ftprintf (stderr, _T ("Error %d creating signal event for `%s'\n"), | |
| 235 GetLastError (), command); | |
| 236 return 2; | |
| 237 } | |
| 238 | |
| 239 SetConsoleCtrlHandler ((PHANDLER_ROUTINE) ctrl_c_handler, TRUE); | |
| 240 _tcsncpy (new_command, command, past_exe - command); | |
| 241 _stprintf (new_command + (past_exe - command), | |
| 242 /* start with space in case no args past command name */ | |
| 243 " -mswindows-termination-handle %d ", (long) external_event); | |
| 244 _tcscat (new_command, past_exe); | |
| 245 | |
| 246 if (CreateProcess (NULL, new_command, NULL, NULL, TRUE, 0, | |
| 247 NULL, NULL, &si, &pi) == 0) | |
| 248 { | |
| 249 _ftprintf (stderr, _T("Error %d launching `%s'\n"), | |
| 250 GetLastError (), command); | |
| 251 return 2; | |
| 252 } | |
| 253 | |
| 254 CloseHandle (pi.hThread); | |
| 255 } | |
| 256 | |
| 442 | 257 |
| 258 /* Start pump in each I-connector */ | |
| 259 start_pump (&I_in); | |
| 260 start_pump (&I_out); | |
| 261 start_pump (&I_err); | |
| 262 | |
| 263 /* Wait for the process to complete */ | |
| 264 WaitForSingleObject (pi.hProcess, INFINITE); | |
| 265 GetExitCodeProcess (pi.hProcess, &exit_code); | |
| 266 CloseHandle (pi.hProcess); | |
| 267 | |
| 268 /* Make pump threads eventually die out. Looks rude, I agree */ | |
| 269 CloseHandle (GetStdHandle (STD_INPUT_HANDLE)); | |
| 270 CloseHandle (GetStdHandle (STD_OUTPUT_HANDLE)); | |
| 271 CloseHandle (GetStdHandle (STD_ERROR_HANDLE)); | |
| 272 | |
| 273 return exit_code; | |
| 274 } |