11 |
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#include "standard.h" |
12 |
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13 |
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#ifdef F_SETLKW |
14 |
– |
|
14 |
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#include "paths.h" |
15 |
+ |
#include "selcall.h" |
16 |
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#include <signal.h> |
17 |
– |
#include <sys/types.h> |
17 |
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#include <sys/stat.h> |
18 |
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19 |
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#ifndef TIMELIM |
111 |
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/* close input and output descriptors */ |
112 |
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close(fileno(stdin)); |
113 |
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close(fileno(stdout)); |
114 |
+ |
if (errfile == NULL) |
115 |
+ |
close(fileno(stderr)); |
116 |
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/* create named pipes for input and output */ |
117 |
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if (mknod(mktemp(strcpy(inpname,TEMPLATE)), S_IFIFO|0600, 0) < 0) |
118 |
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goto createrr; |
126 |
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n = strlen(buf); |
127 |
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if (write(persistfd, buf, n) < n) |
128 |
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error(SYSTEM, "error writing persist file"); |
129 |
+ |
lseek(persistfd, 0L, 0); |
130 |
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/* wait TIMELIM for someone to signal us */ |
131 |
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got_io = 0; |
132 |
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signal(SIGIO, sig_io); |
135 |
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pflock(0); /* unlock persist file for attach */ |
136 |
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while (!got_io) |
137 |
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pause(); /* wait for attach */ |
136 |
– |
pflock(1); /* grab persist file right back! */ |
138 |
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alarm(0); /* turn off alarm */ |
139 |
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signal(SIGALRM, oldalrm); |
140 |
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signal(SIGIO, SIG_DFL); |
141 |
< |
if (lseek(persistfd, 0L, 0) < 0 || ftruncate(persistfd, 0L) < 0) |
141 |
< |
error(SYSTEM, "seek/truncate error on persist file"); |
141 |
> |
pflock(1); /* grab persist file back */ |
142 |
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/* someone wants us; reopen stdin and stdout */ |
143 |
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if (freopen(inpname, "r", stdin) == NULL) |
144 |
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goto openerr; |
145 |
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if (freopen(outpname, "w", stdout) == NULL) |
146 |
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goto openerr; |
147 |
+ |
sleep(3); /* give them a chance to open their pipes */ |
148 |
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if (errname[0]) { |
149 |
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if (freopen(errname, "w", stderr) == NULL) |
150 |
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goto openerr; |
163 |
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} |
164 |
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|
165 |
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|
166 |
< |
io_process() /* just act as conduits to and from actual process */ |
166 |
> |
io_process() /* just act as go-between for actual process */ |
167 |
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{ |
168 |
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register char *cp; |
169 |
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register int nr, n; |
170 |
< |
char buf[512], *pfin, *pfout, *pferr; |
171 |
< |
int pid, pid2 = -1; |
170 |
> |
char buf[BUFSIZ], *pfin, *pfout, *pferr; |
171 |
> |
int pid, nfds; |
172 |
> |
int fdout, fderr = -1; |
173 |
> |
int status = 0; |
174 |
> |
fd_set readfds, excepfds; |
175 |
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/* load persist file */ |
176 |
+ |
n = 40; |
177 |
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while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) { |
178 |
+ |
if (!n--) |
179 |
+ |
error(USER, "unattended persist file?"); |
180 |
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pflock(0); |
181 |
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sleep(15); /* wait until ready */ |
182 |
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pflock(1); |
183 |
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} |
177 |
– |
pfdetach(); /* close persist file */ |
184 |
|
if (nr < 0) |
185 |
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error(SYSTEM, "error reading persist file"); |
186 |
< |
buf[nr] = '\0'; |
186 |
> |
ftruncate(persistfd, 0L); /* truncate persist file */ |
187 |
> |
pfdetach(); /* close & release persist file */ |
188 |
> |
buf[nr] = '\0'; /* parse what we got */ |
189 |
|
if ((cp = index(buf, ' ')) == NULL) |
190 |
|
goto formerr; |
191 |
|
*cp++ = '\0'; |
211 |
|
sprintf(errmsg, "persist file for %s, not %s", buf, progname); |
212 |
|
error(USER, errmsg); |
213 |
|
} |
214 |
< |
/* wake up rendering process */ |
214 |
> |
/* wake up rendering process */ |
215 |
|
if (kill(pid, SIGIO) < 0) |
216 |
|
error(SYSTEM, "cannot signal rendering process in io_process"); |
217 |
< |
pid = fork(); /* fork i/o process */ |
217 |
> |
/* fork child feeder process */ |
218 |
> |
pid = fork(); |
219 |
|
if (pid < 0) |
220 |
< |
goto forkerr; |
221 |
< |
/* connect to appropriate pipe */ |
222 |
< |
if (pid) { /* parent passes renderer output */ |
223 |
< |
close(0); |
224 |
< |
if (pferr[0]) { |
225 |
< |
pid2 = fork(); /* fork another for stderr */ |
226 |
< |
if (pid2 < 0) |
227 |
< |
goto forkerr; |
220 |
> |
error(SYSTEM, "fork failed in io_process"); |
221 |
> |
if (pid == 0) { /* feeder loop */ |
222 |
> |
int fdin; |
223 |
> |
close(1); /* open input pipe */ |
224 |
> |
if ((fdin = open(pfin, O_WRONLY)) < 0) |
225 |
> |
error(SYSTEM, "cannot open feed pipe in io_process"); |
226 |
> |
/* renderer stdin */ |
227 |
> |
while ((nr = read(0, cp=buf, sizeof(buf))) > 0) { |
228 |
> |
do { |
229 |
> |
if ((n = write(fdin, cp, nr)) <= 0) |
230 |
> |
goto writerr; |
231 |
> |
cp += n; |
232 |
> |
} while ((nr -= n) > 0); |
233 |
|
} |
234 |
< |
if (pid2) { /* parent is still stdout */ |
235 |
< |
if (open(pfout, O_RDONLY) != 0) |
236 |
< |
error(SYSTEM, |
237 |
< |
"cannot open output pipe in io_process"); |
238 |
< |
} else { /* second child is stderr */ |
239 |
< |
if (open(pferr, O_RDONLY) != 0) |
240 |
< |
error(SYSTEM, |
241 |
< |
"cannot open error pipe in io_process"); |
242 |
< |
dup2(2, 1); /* attach stdout to stderr */ |
234 |
> |
if (nr < 0) |
235 |
> |
goto readerr; |
236 |
> |
_exit(0); |
237 |
> |
} |
238 |
> |
close(0); |
239 |
> |
/* open output pipes, in order */ |
240 |
> |
if ((fdout = open(pfout, O_RDONLY)) < 0) |
241 |
> |
error(SYSTEM, "cannot open output pipe in io_process"); |
242 |
> |
if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0) |
243 |
> |
error(SYSTEM, "cannot open error pipe in io_process"); |
244 |
> |
for ( ; ; ) { /* eater loop */ |
245 |
> |
FD_ZERO(&readfds); |
246 |
> |
FD_ZERO(&excepfds); |
247 |
> |
nfds = 0; |
248 |
> |
if (fdout >= 0) { |
249 |
> |
FD_SET(fdout, &readfds); |
250 |
> |
FD_SET(fdout, &excepfds); |
251 |
> |
nfds = fdout+1; |
252 |
|
} |
253 |
< |
} else { /* child passes renderer input */ |
254 |
< |
close(1); |
255 |
< |
if (open(pfin, O_WRONLY) != 1) |
256 |
< |
error(SYSTEM, "cannot open input pipe in io_process"); |
253 |
> |
if (fderr >= 0) { |
254 |
> |
FD_SET(fderr, &readfds); |
255 |
> |
FD_SET(fderr, &excepfds); |
256 |
> |
nfds = fderr+1; |
257 |
> |
} |
258 |
> |
if (nfds == 0) |
259 |
> |
break; /* all done, exit */ |
260 |
> |
if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0) |
261 |
> |
error(SYSTEM, "error in select call in io_process"); |
262 |
> |
/* renderer stderr */ |
263 |
> |
if (fderr >= 0 && (FD_ISSET(fderr, &readfds) || |
264 |
> |
FD_ISSET(fderr, &excepfds))) { |
265 |
> |
nr = read(fderr, cp=buf, sizeof(buf)); |
266 |
> |
if (nr < 0) |
267 |
> |
goto readerr; |
268 |
> |
if (nr == 0) { |
269 |
> |
close(fderr); |
270 |
> |
/* close(2); don't close stderr! */ |
271 |
> |
fderr = -1; |
272 |
> |
} else |
273 |
> |
cp[nr] = '\0'; /* deduce status if we can */ |
274 |
> |
n = strlen(progname); |
275 |
> |
if (!strncmp(cp, progname, n) && |
276 |
> |
cp[n++] == ':' && |
277 |
> |
cp[n++] == ' ') { |
278 |
> |
register struct erract *ep; |
279 |
> |
for (ep = erract; ep < erract+NERRS; |
280 |
> |
ep++) |
281 |
> |
if (ep->pre[0] && |
282 |
> |
!strncmp(cp+n, ep->pre, |
283 |
> |
strlen(ep->pre))) { |
284 |
> |
status = ep->ec; |
285 |
> |
break; |
286 |
> |
} |
287 |
> |
} |
288 |
> |
do { /* write message */ |
289 |
> |
if ((n = write(2, cp, nr)) <= 0) |
290 |
> |
goto writerr; |
291 |
> |
cp += n; |
292 |
> |
} while ((nr -= n) > 0); |
293 |
> |
} |
294 |
> |
/* renderer stdout */ |
295 |
> |
if (fdout >= 0 && (FD_ISSET(fdout, &readfds) || |
296 |
> |
FD_ISSET(fdout, &excepfds))) { |
297 |
> |
nr = read(fdout, cp=buf, sizeof(buf)); |
298 |
> |
if (nr < 0) |
299 |
> |
goto readerr; |
300 |
> |
if (nr == 0) { /* EOF */ |
301 |
> |
close(fdout); |
302 |
> |
close(1); |
303 |
> |
fdout = -1; |
304 |
> |
} else |
305 |
> |
do { /* write it all */ |
306 |
> |
if ((n = write(1, cp, nr)) <= 0) |
307 |
> |
goto writerr; |
308 |
> |
cp += n; |
309 |
> |
} while ((nr -= n) > 0); |
310 |
> |
} |
311 |
|
} |
312 |
< |
/* pass input to output */ |
313 |
< |
/* read as much as we can, write all of it */ |
237 |
< |
while ((nr = read(0, cp=buf, sizeof(buf))) > 0) |
238 |
< |
do { |
239 |
< |
if ((n = write(1, cp, nr)) <= 0) |
240 |
< |
error(SYSTEM, "write error in io_process"); |
241 |
< |
cp += n; |
242 |
< |
} while ((nr -= n) > 0); |
243 |
< |
if (nr < 0) |
244 |
< |
error(SYSTEM, "read error in io_process"); |
245 |
< |
close(0); /* close input */ |
246 |
< |
close(1); /* close output */ |
247 |
< |
if (pid) /* parent waits for stdin child */ |
248 |
< |
wait(0); |
249 |
< |
if (pid2 > 0) /* wait for stderr child also */ |
250 |
< |
wait(0); |
251 |
< |
_exit(0); /* all done, exit (not quit!) */ |
312 |
> |
wait(0); /* wait for feeder process */ |
313 |
> |
_exit(status); |
314 |
|
formerr: |
315 |
|
error(USER, "format error in persist file"); |
316 |
< |
forkerr: |
317 |
< |
error(SYSTEM, "fork failed in io_process"); |
316 |
> |
readerr: |
317 |
> |
error(SYSTEM, "read error in io_process"); |
318 |
> |
writerr: |
319 |
> |
error(SYSTEM, "write error in io_process"); |
320 |
|
} |
321 |
|
|
322 |
|
#else |