1 |
#ifndef lint |
2 |
static char RCSid[]="$Id: win_process.c,v 3.5 2004/10/23 18:55:52 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Routines to communicate with separate process via dual pipes. |
6 |
* Windows version. |
7 |
* |
8 |
* External symbols declared in standard.h |
9 |
*/ |
10 |
|
11 |
#include "copyright.h" |
12 |
|
13 |
#include <stdio.h> |
14 |
#define STRICT |
15 |
#include <windows.h> /* typedefs */ |
16 |
#include <io.h> /* _open_osfhandle */ |
17 |
#include <fcntl.h> /* _O_XXX */ |
18 |
|
19 |
#include "rterror.h" |
20 |
#include "rtio.h" |
21 |
#include "rtprocess.h" |
22 |
|
23 |
|
24 |
int |
25 |
win_nice(int inc) /* simple nice(2) replacement for Windows */ |
26 |
{ |
27 |
/* We don't have much granularity available: IDLE_PRIORITY_CLASS |
28 |
will run whenever no other higher priority process is running */ |
29 |
if (inc > 0) { |
30 |
return (int)!SetPriorityClass(GetCurrentProcess(), IDLE_PRIORITY_CLASS); |
31 |
} |
32 |
return 0; |
33 |
} |
34 |
|
35 |
|
36 |
/* |
37 |
Safely terminate a process by creating a remote thread |
38 |
in the process that calls ExitProcess. |
39 |
As presented by Andrew Tucker in Windows Developer Magazine. |
40 |
*/ |
41 |
#ifndef OBSOLETE_WINDOWS /* won't work on Win 9X/ME/CE. */ |
42 |
BOOL SafeTerminateProcess(HANDLE hProcess, UINT uExitCode) |
43 |
{ |
44 |
DWORD dwTID, dwCode, dwErr = 0; |
45 |
HANDLE hProcessDup = INVALID_HANDLE_VALUE; |
46 |
HANDLE hRT = NULL; |
47 |
HINSTANCE hKernel = GetModuleHandle("Kernel32"); |
48 |
BOOL bSuccess = FALSE; |
49 |
|
50 |
BOOL bDup = DuplicateHandle(GetCurrentProcess(), |
51 |
hProcess, |
52 |
GetCurrentProcess(), |
53 |
&hProcessDup, |
54 |
PROCESS_ALL_ACCESS, |
55 |
FALSE, |
56 |
0); |
57 |
/* Detect the special case where the process is already dead... */ |
58 |
if ( GetExitCodeProcess((bDup) ? hProcessDup : hProcess, &dwCode) && |
59 |
(dwCode == STILL_ACTIVE) ) { |
60 |
FARPROC pfnExitProc; |
61 |
pfnExitProc = GetProcAddress(hKernel, "ExitProcess"); |
62 |
hRT = CreateRemoteThread((bDup) ? hProcessDup : hProcess, |
63 |
NULL, |
64 |
0, |
65 |
(LPTHREAD_START_ROUTINE)pfnExitProc, |
66 |
(PVOID)uExitCode, 0, &dwTID); |
67 |
if ( hRT == NULL ) dwErr = GetLastError(); |
68 |
} else { |
69 |
dwErr = ERROR_PROCESS_ABORTED; |
70 |
} |
71 |
if ( hRT ) { |
72 |
/* Must wait process to terminate to guarantee that it has exited... */ |
73 |
WaitForSingleObject((bDup) ? hProcessDup : hProcess, INFINITE); |
74 |
CloseHandle(hRT); |
75 |
bSuccess = TRUE; |
76 |
} |
77 |
if ( bDup ) CloseHandle(hProcessDup); |
78 |
if ( !bSuccess ) SetLastError(dwErr); |
79 |
return bSuccess; |
80 |
} |
81 |
#endif |
82 |
|
83 |
|
84 |
static int |
85 |
start_process(SUBPROC *proc, char *cmdstr) |
86 |
{ |
87 |
BOOL res; |
88 |
int Pflags = 0; |
89 |
SECURITY_ATTRIBUTES SAttrs; |
90 |
STARTUPINFO SInfo; |
91 |
PROCESS_INFORMATION PInfo; |
92 |
/* welcome to the world of resource handles */ |
93 |
HANDLE hToChildRead = NULL; |
94 |
HANDLE hToChildWrite = NULL; |
95 |
HANDLE hFromChildRead = NULL; |
96 |
HANDLE hFromChildWrite = NULL; |
97 |
HANDLE hRead = NULL, hWrite = NULL; |
98 |
HANDLE hStdIn, hStdOut, hStdErr; |
99 |
HANDLE hCurProc; |
100 |
|
101 |
/* get process and standard stream handles */ |
102 |
hCurProc = GetCurrentProcess(); |
103 |
hStdIn = GetStdHandle(STD_INPUT_HANDLE); |
104 |
hStdOut = GetStdHandle(STD_OUTPUT_HANDLE); |
105 |
hStdErr = GetStdHandle(STD_ERROR_HANDLE); |
106 |
|
107 |
/* the remote pipe handles must be inheritable */ |
108 |
SAttrs.bInheritHandle = 1; |
109 |
SAttrs.lpSecurityDescriptor = NULL; |
110 |
SAttrs.nLength = sizeof(SECURITY_ATTRIBUTES); |
111 |
|
112 |
/* make pipe, assign to stdout */ |
113 |
/* we'll check for errors after CreateProcess()...*/ |
114 |
res = CreatePipe(&hFromChildRead, &hFromChildWrite, &SAttrs, 0); |
115 |
res = SetStdHandle(STD_OUTPUT_HANDLE, hFromChildWrite); |
116 |
/* create non-inheritable dup of local end */ |
117 |
res = DuplicateHandle(hCurProc, hFromChildRead, hCurProc, &hRead, |
118 |
0, FALSE, DUPLICATE_SAME_ACCESS); |
119 |
CloseHandle(hFromChildRead); hFromChildRead = NULL; |
120 |
|
121 |
res = CreatePipe(&hToChildRead, &hToChildWrite, &SAttrs, 0); |
122 |
res = SetStdHandle(STD_INPUT_HANDLE, hToChildRead); |
123 |
res = DuplicateHandle(hCurProc, hToChildWrite, hCurProc, &hWrite, |
124 |
0, FALSE, DUPLICATE_SAME_ACCESS); |
125 |
CloseHandle(hToChildWrite); hToChildWrite = NULL; |
126 |
|
127 |
CloseHandle(hCurProc); hCurProc = NULL; |
128 |
|
129 |
/* do some bookkeeping for Windows... */ |
130 |
SInfo.cb = sizeof(STARTUPINFO); |
131 |
SInfo.lpReserved = NULL; |
132 |
SInfo.lpDesktop = NULL; |
133 |
SInfo.lpTitle = NULL; |
134 |
SInfo.cbReserved2 = 0; |
135 |
SInfo.lpReserved2 = NULL; |
136 |
/* don't open a console automatically, pass handles */ |
137 |
SInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES; |
138 |
SInfo.wShowWindow = SW_HIDE; |
139 |
SInfo.hStdInput = hToChildRead; |
140 |
SInfo.hStdOutput = hFromChildWrite; |
141 |
SInfo.hStdError = hStdErr; /* reuse original stderr */ |
142 |
|
143 |
res = CreateProcess(NULL, /* command name */ |
144 |
cmdstr, /* full command line */ |
145 |
NULL, /* default process attributes */ |
146 |
NULL, /* default security attributes */ |
147 |
1, /* inherit handles (pass doesn't work reliably) */ |
148 |
Pflags, /* process flags */ |
149 |
NULL, /* no new environment */ |
150 |
NULL, /* stay in current directory */ |
151 |
&SInfo, |
152 |
&PInfo |
153 |
); |
154 |
/* reset stdin/stdout in any case */ |
155 |
SetStdHandle(STD_OUTPUT_HANDLE, hStdOut); |
156 |
SetStdHandle(STD_INPUT_HANDLE, hStdIn); |
157 |
/* Oops... */ |
158 |
if(res == 0) { |
159 |
char es[128]; |
160 |
_snprintf(es, sizeof(es), |
161 |
"Error creating process (%d)\n", GetLastError()); |
162 |
eputs(es); |
163 |
goto error; |
164 |
} |
165 |
/* close stuff we don't need */ |
166 |
CloseHandle(PInfo.hThread); |
167 |
CloseHandle(hFromChildWrite); hFromChildWrite = NULL; |
168 |
CloseHandle(hToChildRead); hToChildRead = NULL; |
169 |
/* get the file descriptors */ |
170 |
proc->r = _open_osfhandle((long)hRead, _O_RDONLY); |
171 |
proc->w = _open_osfhandle((long)hWrite, _O_APPEND); |
172 |
proc->pid = PInfo.dwProcessId; |
173 |
proc->running = 1; |
174 |
CloseHandle(hCurProc); |
175 |
/* Windows doesn't tell us the actual buffer size */ |
176 |
return PIPE_BUF; |
177 |
|
178 |
error: /* cleanup */ |
179 |
if(PInfo.hThread) CloseHandle(PInfo.hThread); |
180 |
if(hToChildRead) CloseHandle(hToChildRead); |
181 |
if(hToChildWrite) CloseHandle(hToChildWrite); |
182 |
if(hFromChildRead) CloseHandle(hFromChildRead); |
183 |
if(hFromChildWrite) CloseHandle(hFromChildWrite); |
184 |
if(hRead) CloseHandle(hRead); |
185 |
if(hWrite) CloseHandle(hWrite); |
186 |
if(hCurProc) CloseHandle(hCurProc); |
187 |
proc->running = 0; |
188 |
return 0; |
189 |
/* There... Are we happy now? */ |
190 |
} |
191 |
|
192 |
|
193 |
static int /* copied size or -1 on error */ |
194 |
wordncopy( /* copy (quoted) src to dest. */ |
195 |
|
196 |
char * dest, |
197 |
char * src, |
198 |
int dlen, |
199 |
int insert_space, /* prepend a space */ |
200 |
int force_dq /* turn 'src' into "dest" (for Win command line) */ |
201 |
) |
202 |
{ |
203 |
int slen; |
204 |
int pos = 0; |
205 |
|
206 |
slen = strlen(src); |
207 |
if (insert_space) { |
208 |
if (1 >= dlen) return -1; |
209 |
dest[pos++] = ' '; |
210 |
} |
211 |
if (strpbrk(src, " \f\n\r\t\v")) { |
212 |
if (force_dq && src[0] == '\'' && src[slen-1] == '\'') { |
213 |
if (slen + pos + 1 > dlen) return -1; |
214 |
dest[pos++] = '"'; |
215 |
strncpy(dest + pos, src + 1, slen -2); |
216 |
pos += slen - 2; |
217 |
dest[pos++] = '"'; |
218 |
} else if (src[0] == '"' && src[slen-1] == '"') { |
219 |
if (slen + pos + 1 > dlen) return -1; |
220 |
strncpy(dest + pos, src, slen); |
221 |
pos += slen; |
222 |
} else { |
223 |
if (slen + pos + 3 > dlen) return -1; |
224 |
dest[pos++] = '"'; |
225 |
strncpy(dest + pos, src, slen); |
226 |
pos += slen; |
227 |
dest[pos++] = '"'; |
228 |
} |
229 |
} else { |
230 |
if (slen + pos + 1 > dlen) return -1; |
231 |
strncpy(dest + pos, src, slen); |
232 |
pos += slen; |
233 |
} |
234 |
dest[pos] = '\0'; |
235 |
return pos; |
236 |
} |
237 |
|
238 |
|
239 |
|
240 |
static char * |
241 |
quoted_cmdline( /* compose command line for StartProcess() as static string */ |
242 |
|
243 |
char *cmdpath, /* full path to executable */ |
244 |
char *sl[] /* list of arguments */ |
245 |
) |
246 |
{ |
247 |
static char *cmdstr; |
248 |
static int clen; |
249 |
char *newcs; |
250 |
int newlen, pos, res, i; |
251 |
|
252 |
newlen = strlen(cmdpath) + 3; /* allow two quotes plus the final \0 */ |
253 |
for (i = 0; sl[i] != NULL; i++) { |
254 |
newlen += strlen(sl[i]) + 3; /* allow two quotes and a space */ |
255 |
} |
256 |
if (cmdstr == NULL) { |
257 |
cmdstr = (char *) malloc(newlen); |
258 |
if (cmdstr == NULL) return NULL; |
259 |
} else if (newlen > clen) { |
260 |
newcs = (char *) realloc(cmdstr, newlen); |
261 |
if (newcs == NULL) return NULL; |
262 |
cmdstr = newcs; |
263 |
} |
264 |
clen = newlen; |
265 |
pos = wordncopy(cmdstr, cmdpath, clen, 0, 1); |
266 |
if (pos < 0) return NULL; |
267 |
for (i = 0; sl[i] != NULL; i++) { |
268 |
res = wordncopy(cmdstr + pos, sl[i], clen - pos, 1, 1); |
269 |
if (res < 0) return NULL; |
270 |
pos += res; |
271 |
} |
272 |
return cmdstr; |
273 |
} |
274 |
|
275 |
|
276 |
int |
277 |
open_process(SUBPROC *proc, char *av[]) |
278 |
{ |
279 |
char *cmdpath; |
280 |
char *cmdstr; |
281 |
|
282 |
proc->running = 0; |
283 |
cmdpath = getpath(av[0], getenv("PATH"), X_OK); |
284 |
cmdstr = quoted_cmdline(cmdpath, av+1); |
285 |
if (cmdstr == NULL) { return 0; } |
286 |
return start_process(proc, cmdstr); |
287 |
} |
288 |
|
289 |
|
290 |
int win_kill(RT_PID pid, int sig) /* we ignore sig... */ |
291 |
{ |
292 |
HANDLE hProc; |
293 |
|
294 |
hProc = OpenProcess(SYNCHRONIZE|PROCESS_TERMINATE, FALSE, pid); |
295 |
/* it looks like we want to ignore errors here */ |
296 |
if(hProc != NULL) { |
297 |
#ifdef OBSOLETE_WINDOWS |
298 |
#define KILL_TIMEOUT 10 * 1000 /* milliseconds */ |
299 |
/* it might have some windows open... */ |
300 |
EnumWindows((WNDENUMPROC)TerminateAppEnum, (LPARAM)pid); |
301 |
if(WaitForSingleObject(hProc, KILL_TIMEOUT)!=WAIT_OBJECT_0) { |
302 |
/* No way to avoid dangling DLLs here. */ |
303 |
TerminateProcess(hProc, 0); |
304 |
} |
305 |
#else |
306 |
SafeTerminateProcess(hProc, 0); |
307 |
#endif |
308 |
/* WaitForSingleObject(hProc, 0); */ |
309 |
/* not much use to wait on Windows */ |
310 |
CloseHandle(hProc); |
311 |
} |
312 |
return 0; /* XXX we need to figure out more here... */ |
313 |
} |
314 |
|
315 |
|
316 |
int |
317 |
close_process(SUBPROC *proc) { |
318 |
int icres, ocres; |
319 |
DWORD pid; |
320 |
|
321 |
ocres = close(proc->w); |
322 |
icres = close(proc->r); |
323 |
pid = proc->pid; |
324 |
if(ocres != 0 || icres != 0) { |
325 |
/* something went wrong: enforce infanticide */ |
326 |
/* other than that, it looks like we want to ignore errors here */ |
327 |
if (proc->running) { |
328 |
win_kill(pid, 0); |
329 |
} |
330 |
} |
331 |
proc->running = 0; |
332 |
return 0; /* XXX we need to figure out more here... */ |
333 |
} |
334 |
|
335 |
|
336 |
#ifdef TEST_MODULE |
337 |
int |
338 |
main( int argc, char **argv ) |
339 |
{ |
340 |
SUBPROC proc; |
341 |
FILE *inf, *outf; |
342 |
int res; |
343 |
char ret[1024]; |
344 |
char *command[]= {"word", "gappy word", "\"quoted words\"", "'squoted words'", NULL}; |
345 |
|
346 |
res = open_process(&proc, command) |
347 |
if (res == 0) { |
348 |
printf("open_process() failed with return value 0\n"); |
349 |
return -1; |
350 |
} |
351 |
printf("process opened with return value: %d, pid: %d, r: %d, w: %d\n", |
352 |
res, proc.pid, proc.r, proc.w); |
353 |
inf = fdopen(proc.r, "rb"); |
354 |
outf = fdopen(proc.w, "wb"); |
355 |
fprintf(outf,"0 0 0 0 1 0\n"); |
356 |
fflush(outf); |
357 |
fgets(ret, sizeof(ret), inf); |
358 |
printf("%s\n",ret); |
359 |
close_process(&proc); |
360 |
} |
361 |
#endif |
362 |
|