1 |
schorsch |
1.1 |
#ifndef lint |
2 |
greg |
1.5 |
static const char RCSid[] = "$Id: win_popen.c,v 1.4 2004/10/04 10:14:22 schorsch Exp $"; |
3 |
schorsch |
1.1 |
#endif |
4 |
|
|
/* |
5 |
|
|
Replacement for the posix popen() on Windows |
6 |
|
|
|
7 |
|
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We don't just let the shell do the work like the original. |
8 |
|
|
Since per default there's no decent shell around, we implement |
9 |
|
|
the most basic functionality right here. |
10 |
|
|
|
11 |
|
|
currently supports mode "r" and | to chain several processes. |
12 |
|
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Substrings between matching quotes are considered one word, |
13 |
|
|
ignoring any | within. Quotes don't nest. |
14 |
|
|
|
15 |
|
|
*/ |
16 |
|
|
|
17 |
|
|
#include <windows.h> |
18 |
|
|
#include <stdlib.h> |
19 |
|
|
#include <stdio.h> |
20 |
|
|
#include <string.h> |
21 |
|
|
#include <ctype.h> |
22 |
|
|
#include <io.h> /* _open_osfhandle() */ |
23 |
|
|
#include <fcntl.h> /* _O_RDONLY */ |
24 |
|
|
|
25 |
schorsch |
1.4 |
#include "paths.h" |
26 |
schorsch |
1.1 |
#include "rtio.h" |
27 |
|
|
#include "rterror.h" |
28 |
|
|
|
29 |
|
|
|
30 |
|
|
#define RAD_MAX_PIPES 32 /* maximum number of pipes */ |
31 |
|
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|
32 |
schorsch |
1.3 |
#define R_MODE 1 |
33 |
|
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#define W_MODE 2 |
34 |
|
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#define A_MODE 3 |
35 |
|
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|
36 |
|
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static int parse_pipes(char *s, char *lines[], char **infn, char **outfn, |
37 |
|
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int *append, int maxl); |
38 |
schorsch |
1.1 |
static BOOL createPipes(HANDLE*, HANDLE*, HANDLE*, HANDLE*); |
39 |
|
|
static BOOL runChild(char*, char*, HANDLE, HANDLE, HANDLE); |
40 |
|
|
static void resetStdHandles(HANDLE stdoutOrig, HANDLE stdinOrig); |
41 |
schorsch |
1.3 |
HANDLE newFile(char *fn, int mode); |
42 |
schorsch |
1.1 |
|
43 |
|
|
|
44 |
|
|
int |
45 |
schorsch |
1.2 |
win_pclose( /* posix pclose replacement */ |
46 |
schorsch |
1.1 |
FILE* p |
47 |
|
|
) |
48 |
|
|
{ |
49 |
|
|
fclose(p); |
50 |
|
|
/* not sure if it's useful to wait for anything on Windows */ |
51 |
|
|
return 0; |
52 |
|
|
} |
53 |
|
|
|
54 |
|
|
|
55 |
|
|
FILE * |
56 |
schorsch |
1.2 |
win_popen( /* posix popen replacement */ |
57 |
schorsch |
1.1 |
char* command, |
58 |
|
|
char* type |
59 |
|
|
) |
60 |
|
|
{ |
61 |
|
|
char *execfile, *args; |
62 |
|
|
char *cmdlines[RAD_MAX_PIPES]; |
63 |
schorsch |
1.3 |
char *infn = NULL, *outfn = NULL; |
64 |
|
|
char executable[512], estr[512]; |
65 |
|
|
int n, i, mode = 0, append = 0; |
66 |
schorsch |
1.1 |
int ncmds = 0; |
67 |
schorsch |
1.3 |
FILE *inf = NULL; |
68 |
greg |
1.5 |
char *s = NULL; |
69 |
schorsch |
1.1 |
HANDLE stdoutRd = NULL, stdoutWr = NULL; |
70 |
|
|
HANDLE stdinRd = NULL, stdinWr = NULL; |
71 |
|
|
HANDLE stderrWr = NULL; |
72 |
|
|
HANDLE stdoutOrig, stdinOrig; |
73 |
|
|
|
74 |
schorsch |
1.3 |
if (strchr(type, 'w')) { |
75 |
|
|
mode = W_MODE; |
76 |
|
|
} else if (strchr(type, 'r')) { |
77 |
|
|
mode = R_MODE; |
78 |
|
|
} else { |
79 |
|
|
_snprintf(estr, sizeof(estr), |
80 |
|
|
"Invalid mode \"%s\" for win_popen().", type); |
81 |
|
|
eputs(estr); |
82 |
|
|
return NULL; |
83 |
|
|
} |
84 |
greg |
1.5 |
/* single quotes aren't removed, so change to double-quotes */ |
85 |
|
|
for (s=command; *s; s++) |
86 |
|
|
if (*s == '\'') |
87 |
|
|
*s = '"'; |
88 |
schorsch |
1.3 |
|
89 |
schorsch |
1.1 |
stdoutOrig = GetStdHandle(STD_OUTPUT_HANDLE); |
90 |
|
|
stdinOrig = GetStdHandle(STD_INPUT_HANDLE); |
91 |
|
|
/* if we have a console, use it for error output */ |
92 |
|
|
stderrWr = GetStdHandle(STD_ERROR_HANDLE); |
93 |
|
|
|
94 |
schorsch |
1.3 |
ncmds = parse_pipes(command,cmdlines,&infn,&outfn,&append,RAD_MAX_PIPES); |
95 |
|
|
if(ncmds <= 0) { |
96 |
schorsch |
1.1 |
eputs("Too many pipes or malformed command."); |
97 |
|
|
goto error; |
98 |
|
|
} |
99 |
|
|
|
100 |
schorsch |
1.3 |
if (infn != NULL) { |
101 |
|
|
stdoutRd = newFile(infn, mode); |
102 |
|
|
} |
103 |
|
|
|
104 |
schorsch |
1.1 |
for(n = 0; n < ncmds; ++n) { |
105 |
|
|
if(!createPipes(&stdoutRd, &stdoutWr, |
106 |
|
|
&stdinRd, &stdinWr)) { |
107 |
|
|
eputs("Error creating pipe"); |
108 |
|
|
goto error; |
109 |
|
|
} |
110 |
schorsch |
1.3 |
if (outfn != NULL && n == ncmds - 1) { |
111 |
|
|
CloseHandle(stdoutWr); |
112 |
|
|
CloseHandle(stdoutRd); |
113 |
|
|
stdoutWr = newFile(outfn, mode); |
114 |
|
|
} |
115 |
|
|
if (n == 0 && mode == W_MODE) { |
116 |
|
|
/* create a standard C file pointer for writing to the input */ |
117 |
|
|
inf = _fdopen(_open_osfhandle((long)stdinWr, _O_RDONLY), "w"); |
118 |
|
|
} |
119 |
schorsch |
1.1 |
/* find the executable on the PATH */ |
120 |
|
|
args = nextword(executable, sizeof(executable), cmdlines[n]); |
121 |
|
|
if (args == NULL) { |
122 |
|
|
eputs("Empty command."); |
123 |
|
|
goto error; |
124 |
|
|
} |
125 |
|
|
execfile = getpath(executable, getenv("PATH"), X_OK); |
126 |
|
|
if(execfile == NULL) { |
127 |
|
|
_snprintf(estr, sizeof(estr), |
128 |
|
|
"Can't find executable for \"%s\".", executable); |
129 |
|
|
eputs(estr); |
130 |
|
|
goto error; |
131 |
|
|
} |
132 |
|
|
if(!runChild(execfile, cmdlines[n], stdinRd, stdoutWr, stderrWr)) { |
133 |
|
|
_snprintf(estr, sizeof(estr), |
134 |
|
|
"Unable to execute executable \"%s\".", executable); |
135 |
|
|
eputs(estr); |
136 |
|
|
goto error; |
137 |
|
|
} |
138 |
|
|
/* close the stdout end just passed to the last process, |
139 |
|
|
or the final read will block */ |
140 |
|
|
CloseHandle(stdoutWr); |
141 |
|
|
} |
142 |
schorsch |
1.3 |
|
143 |
schorsch |
1.1 |
/* clean up */ |
144 |
|
|
resetStdHandles(stdinOrig, stdoutOrig); |
145 |
|
|
for (i = 0; i < ncmds; i++) free(cmdlines[i]); |
146 |
schorsch |
1.3 |
if (infn != NULL) free(infn); |
147 |
|
|
if (outfn != NULL) free(outfn); |
148 |
schorsch |
1.1 |
|
149 |
schorsch |
1.3 |
if (mode == R_MODE) { |
150 |
|
|
/* return a standard C file pointer for reading the output */ |
151 |
|
|
return _fdopen(_open_osfhandle((long)stdoutRd, _O_RDONLY), "r"); |
152 |
|
|
} else if (mode == W_MODE) { |
153 |
|
|
/* return a standard C file pointer for writing to the input */ |
154 |
|
|
return inf; |
155 |
|
|
} |
156 |
schorsch |
1.1 |
|
157 |
|
|
error: |
158 |
|
|
resetStdHandles(stdinOrig, stdoutOrig); |
159 |
|
|
for (i = 0; i < ncmds; i++) free(cmdlines[i]); |
160 |
schorsch |
1.3 |
if (infn != NULL) free(infn); |
161 |
|
|
if (outfn != NULL) free(outfn); |
162 |
schorsch |
1.1 |
return NULL; |
163 |
|
|
} |
164 |
|
|
|
165 |
|
|
|
166 |
schorsch |
1.3 |
HANDLE |
167 |
|
|
newFile(char *fn, int mode) |
168 |
|
|
{ |
169 |
|
|
SECURITY_ATTRIBUTES sAttr; |
170 |
|
|
HANDLE fh; |
171 |
|
|
|
172 |
|
|
sAttr.nLength = sizeof(SECURITY_ATTRIBUTES); |
173 |
|
|
sAttr.bInheritHandle = TRUE; |
174 |
|
|
sAttr.lpSecurityDescriptor = NULL; |
175 |
|
|
|
176 |
|
|
if (mode == R_MODE) { |
177 |
|
|
fh = CreateFile(fn, |
178 |
|
|
GENERIC_READ, |
179 |
|
|
FILE_SHARE_READ, |
180 |
|
|
&sAttr, |
181 |
|
|
OPEN_EXISTING, |
182 |
|
|
FILE_ATTRIBUTE_NORMAL, |
183 |
|
|
NULL); |
184 |
|
|
} else if (mode == W_MODE || mode == A_MODE) { |
185 |
|
|
fh = CreateFile(fn, |
186 |
|
|
GENERIC_WRITE, |
187 |
|
|
FILE_SHARE_WRITE, |
188 |
|
|
&sAttr, |
189 |
|
|
mode==W_MODE?CREATE_ALWAYS:OPEN_ALWAYS, |
190 |
|
|
FILE_ATTRIBUTE_NORMAL, |
191 |
|
|
NULL); |
192 |
|
|
} |
193 |
|
|
if (fh == NULL) { |
194 |
|
|
int e = GetLastError(); |
195 |
|
|
} |
196 |
|
|
return fh; |
197 |
|
|
} |
198 |
|
|
|
199 |
|
|
|
200 |
schorsch |
1.1 |
static BOOL |
201 |
|
|
createPipes( /* establish matching pipes for a subprocess */ |
202 |
|
|
HANDLE* stdoutRd, |
203 |
|
|
HANDLE* stdoutWr, |
204 |
|
|
HANDLE* stdinRd, |
205 |
|
|
HANDLE* stdinWr |
206 |
|
|
) |
207 |
|
|
{ |
208 |
|
|
HANDLE stdoutRdInh = NULL; |
209 |
|
|
HANDLE stdinWrInh = NULL; |
210 |
|
|
HANDLE curproc; |
211 |
|
|
SECURITY_ATTRIBUTES sAttr; |
212 |
|
|
|
213 |
|
|
curproc = GetCurrentProcess(); |
214 |
|
|
|
215 |
|
|
/* The rules of inheritance for handles are a mess. |
216 |
|
|
Just to be safe, make all handles we pass to the |
217 |
|
|
child processes inheritable */ |
218 |
|
|
sAttr.nLength = sizeof(SECURITY_ATTRIBUTES); |
219 |
|
|
sAttr.bInheritHandle = TRUE; |
220 |
|
|
sAttr.lpSecurityDescriptor = NULL; |
221 |
|
|
|
222 |
|
|
if(*stdoutRd != NULL){ |
223 |
|
|
/* if we have a previous stdout pipe, |
224 |
|
|
assign the other end to stdin for the new process */ |
225 |
|
|
CloseHandle(*stdinRd); |
226 |
|
|
if(!DuplicateHandle(curproc, *stdoutRd, |
227 |
|
|
curproc, stdinRd, 0, |
228 |
|
|
TRUE, DUPLICATE_SAME_ACCESS)) |
229 |
|
|
return FALSE; |
230 |
|
|
CloseHandle(*stdoutRd); |
231 |
|
|
if(!SetStdHandle(STD_INPUT_HANDLE, *stdinRd)) |
232 |
|
|
return FALSE; |
233 |
|
|
} else { |
234 |
|
|
/* there's no previous stdout, create a new stdin pipe */ |
235 |
|
|
if(!CreatePipe(stdinRd, &stdinWrInh, &sAttr, 0)) |
236 |
|
|
return FALSE; |
237 |
|
|
if(!SetStdHandle(STD_INPUT_HANDLE, *stdinRd)) |
238 |
|
|
return FALSE; |
239 |
|
|
CloseHandle(stdinWrInh); |
240 |
|
|
} |
241 |
|
|
|
242 |
|
|
/* create the stdout pipe for the new process */ |
243 |
|
|
if(!CreatePipe(&stdoutRdInh, stdoutWr, &sAttr, 0)) |
244 |
|
|
return FALSE; |
245 |
|
|
if(!SetStdHandle(STD_OUTPUT_HANDLE, *stdoutWr)) |
246 |
|
|
return FALSE; |
247 |
|
|
if(!DuplicateHandle(curproc, stdoutRdInh, |
248 |
|
|
curproc, stdoutRd, 0, |
249 |
|
|
FALSE, DUPLICATE_SAME_ACCESS)) |
250 |
|
|
return FALSE; |
251 |
|
|
CloseHandle(stdoutRdInh); |
252 |
|
|
|
253 |
|
|
return TRUE; |
254 |
|
|
} |
255 |
|
|
|
256 |
|
|
|
257 |
|
|
static void |
258 |
|
|
resetStdHandles( /* clean up our std streams */ |
259 |
|
|
HANDLE stdoutOrig, |
260 |
|
|
HANDLE stdinOrig |
261 |
|
|
) |
262 |
|
|
{ |
263 |
|
|
SetStdHandle(STD_OUTPUT_HANDLE, stdoutOrig); |
264 |
|
|
SetStdHandle(STD_INPUT_HANDLE, stdinOrig); |
265 |
|
|
} |
266 |
|
|
|
267 |
|
|
|
268 |
|
|
static int |
269 |
|
|
parse_pipes( /* split a shell command pipe sequence */ |
270 |
schorsch |
1.3 |
char *s, |
271 |
|
|
char *lines[], |
272 |
|
|
char **infn, |
273 |
|
|
char **outfn, |
274 |
|
|
int *append, |
275 |
schorsch |
1.1 |
int maxl |
276 |
|
|
) |
277 |
|
|
{ |
278 |
|
|
int n = 0, i; |
279 |
|
|
char *se, *ws; |
280 |
schorsch |
1.3 |
char *curs; |
281 |
schorsch |
1.1 |
int llen = 0; |
282 |
|
|
int quote = 0; |
283 |
schorsch |
1.3 |
int last = 0; |
284 |
schorsch |
1.1 |
|
285 |
|
|
if (maxl<= 0) return 0; |
286 |
|
|
if (s == NULL) { |
287 |
|
|
return 0; |
288 |
|
|
} |
289 |
schorsch |
1.3 |
*infn = *outfn = NULL; |
290 |
schorsch |
1.1 |
while (isspace(*s)) s++; /* leading whitespace */ |
291 |
|
|
se = s; |
292 |
|
|
while (n < maxl) { |
293 |
|
|
switch (*se) { |
294 |
|
|
case '"': |
295 |
|
|
if (quote == '"') quote = 0; |
296 |
|
|
else if (quote == 0) quote = '"'; |
297 |
|
|
break; |
298 |
|
|
case '\'': |
299 |
|
|
if (quote == '\'') quote = 0; |
300 |
|
|
else if (quote == 0) quote = '\''; |
301 |
|
|
break; |
302 |
schorsch |
1.3 |
case '<': |
303 |
|
|
case '>': |
304 |
schorsch |
1.1 |
case '|': |
305 |
|
|
case '\0': |
306 |
schorsch |
1.3 |
if (*se != '\0' && quote) |
307 |
schorsch |
1.1 |
break; |
308 |
|
|
llen = se - s; |
309 |
schorsch |
1.3 |
curs = malloc(llen+1); |
310 |
|
|
strncpy(curs, s, llen); |
311 |
schorsch |
1.1 |
/* remove unix style line-end escapes */ |
312 |
schorsch |
1.3 |
while((ws = strstr(curs, "\\\n")) != NULL) |
313 |
schorsch |
1.1 |
*ws = *(ws+1) = ' '; |
314 |
|
|
/* remove DOS style line-end escapes */ |
315 |
schorsch |
1.3 |
while((ws = strstr(curs, "\\\r\n")) != NULL) |
316 |
schorsch |
1.1 |
*ws = *(ws+1) = *(ws+2) = ' '; |
317 |
schorsch |
1.3 |
while (isspace(*(curs + llen - 1))) |
318 |
schorsch |
1.1 |
llen--; /* trailing whitespace */ |
319 |
schorsch |
1.3 |
curs[llen] = '\0'; |
320 |
|
|
|
321 |
|
|
if (last == '|' || last == 0) { /* first or pipe */ |
322 |
|
|
lines[n] = curs; |
323 |
|
|
n++; |
324 |
|
|
curs = NULL; |
325 |
|
|
} else if (last == '<') { /* input file */ |
326 |
|
|
if (*infn != NULL) { |
327 |
|
|
eputs("win_popen(): ambiguous input redirection"); |
328 |
|
|
goto error; |
329 |
|
|
} |
330 |
|
|
*infn = curs; |
331 |
|
|
curs = NULL; |
332 |
|
|
} else if (last == '>') { /* output file */ |
333 |
|
|
if (*outfn != NULL) { |
334 |
schorsch |
1.4 |
eputs("win_popen(): ambiguous output redirection"); |
335 |
schorsch |
1.3 |
goto error; |
336 |
|
|
} |
337 |
|
|
*outfn = curs; |
338 |
|
|
curs = NULL; |
339 |
|
|
if (*se != '\0' && *se+1 == '>') { /* >> */ |
340 |
|
|
*append = 1; |
341 |
|
|
se++; |
342 |
|
|
} |
343 |
|
|
} |
344 |
|
|
last = *se; |
345 |
|
|
|
346 |
schorsch |
1.1 |
if (*se == '\0') return n; |
347 |
|
|
s = se + 1; |
348 |
|
|
while (isspace(*s)) s++; /* leading whitespace */ |
349 |
|
|
se = s; |
350 |
|
|
break; |
351 |
|
|
default: |
352 |
|
|
break; |
353 |
|
|
} |
354 |
|
|
se++; |
355 |
|
|
} |
356 |
|
|
/* more jobs than slots */ |
357 |
schorsch |
1.3 |
error: |
358 |
schorsch |
1.1 |
for (i = 0; i < n; i++) free(lines[i]); |
359 |
schorsch |
1.3 |
if (*infn != NULL) free(*infn); |
360 |
|
|
if (*outfn != NULL) free(*outfn); |
361 |
|
|
if (curs != NULL) free(curs); |
362 |
schorsch |
1.1 |
return -1; |
363 |
|
|
} |
364 |
|
|
|
365 |
|
|
|
366 |
|
|
static BOOL |
367 |
|
|
runChild( /* start a child process with the right std streams */ |
368 |
|
|
char* executable, |
369 |
|
|
char* cmdline, |
370 |
|
|
HANDLE stdinRd, |
371 |
|
|
HANDLE stdoutWr, |
372 |
|
|
HANDLE stderrWr |
373 |
|
|
) |
374 |
|
|
{ |
375 |
|
|
PROCESS_INFORMATION procInfo; |
376 |
|
|
STARTUPINFO startupInfo; |
377 |
|
|
|
378 |
|
|
/* use the given handles and don't display the console window */ |
379 |
|
|
ZeroMemory(&startupInfo, sizeof(STARTUPINFO)); |
380 |
|
|
startupInfo.cb = sizeof(STARTUPINFO); |
381 |
|
|
startupInfo.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; |
382 |
|
|
startupInfo.wShowWindow = SW_HIDE; |
383 |
|
|
startupInfo.hStdInput = stdinRd; |
384 |
|
|
startupInfo.hStdOutput = stdoutWr; |
385 |
|
|
startupInfo.hStdError = stderrWr; |
386 |
|
|
|
387 |
|
|
return CreateProcess(executable, cmdline, NULL, NULL, |
388 |
|
|
TRUE, 0, |
389 |
|
|
NULL, NULL, &startupInfo, &procInfo); |
390 |
|
|
} |
391 |
|
|
|
392 |
|
|
|
393 |
|
|
|