| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines for persistent rtrace and rpict processes. |
| 6 |
* |
| 7 |
* External symbols declared in ray.h |
| 8 |
*/ |
| 9 |
|
| 10 |
/* ==================================================================== |
| 11 |
* The Radiance Software License, Version 1.0 |
| 12 |
* |
| 13 |
* Copyright (c) 1990 - 2002 The Regents of the University of California, |
| 14 |
* through Lawrence Berkeley National Laboratory. All rights reserved. |
| 15 |
* |
| 16 |
* Redistribution and use in source and binary forms, with or without |
| 17 |
* modification, are permitted provided that the following conditions |
| 18 |
* are met: |
| 19 |
* |
| 20 |
* 1. Redistributions of source code must retain the above copyright |
| 21 |
* notice, this list of conditions and the following disclaimer. |
| 22 |
* |
| 23 |
* 2. Redistributions in binary form must reproduce the above copyright |
| 24 |
* notice, this list of conditions and the following disclaimer in |
| 25 |
* the documentation and/or other materials provided with the |
| 26 |
* distribution. |
| 27 |
* |
| 28 |
* 3. The end-user documentation included with the redistribution, |
| 29 |
* if any, must include the following acknowledgment: |
| 30 |
* "This product includes Radiance software |
| 31 |
* (http://radsite.lbl.gov/) |
| 32 |
* developed by the Lawrence Berkeley National Laboratory |
| 33 |
* (http://www.lbl.gov/)." |
| 34 |
* Alternately, this acknowledgment may appear in the software itself, |
| 35 |
* if and wherever such third-party acknowledgments normally appear. |
| 36 |
* |
| 37 |
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
| 38 |
* and "The Regents of the University of California" must |
| 39 |
* not be used to endorse or promote products derived from this |
| 40 |
* software without prior written permission. For written |
| 41 |
* permission, please contact [email protected]. |
| 42 |
* |
| 43 |
* 5. Products derived from this software may not be called "Radiance", |
| 44 |
* nor may "Radiance" appear in their name, without prior written |
| 45 |
* permission of Lawrence Berkeley National Laboratory. |
| 46 |
* |
| 47 |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| 48 |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 49 |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 50 |
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
| 51 |
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 52 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 53 |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 54 |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 55 |
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 56 |
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 57 |
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 58 |
* SUCH DAMAGE. |
| 59 |
* ==================================================================== |
| 60 |
* |
| 61 |
* This software consists of voluntary contributions made by many |
| 62 |
* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
| 63 |
* information on Lawrence Berkeley National Laboratory, please see |
| 64 |
* <http://www.lbl.gov/>. |
| 65 |
*/ |
| 66 |
|
| 67 |
#include "standard.h" |
| 68 |
#include "random.h" |
| 69 |
|
| 70 |
#ifdef F_SETLKW |
| 71 |
#include "paths.h" |
| 72 |
#include "selcall.h" |
| 73 |
#include <signal.h> |
| 74 |
#include <sys/stat.h> |
| 75 |
|
| 76 |
#ifndef TIMELIM |
| 77 |
#define TIMELIM (8*3600) /* time limit for holding pattern */ |
| 78 |
#endif |
| 79 |
|
| 80 |
#ifndef freebsd |
| 81 |
#define mkfifo(fn,md) mknod(fn, S_IFIFO|(md), 0) |
| 82 |
#endif |
| 83 |
|
| 84 |
extern void io_process(); |
| 85 |
|
| 86 |
extern int headismine; /* boolean true if header belongs to me */ |
| 87 |
|
| 88 |
extern char *progname; /* global program name */ |
| 89 |
|
| 90 |
extern char *errfile; /* global error file name */ |
| 91 |
|
| 92 |
static char *persistfname = NULL; /* persist file name */ |
| 93 |
static int persistfd = -1; /* persist file descriptor */ |
| 94 |
|
| 95 |
static char inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1]; |
| 96 |
|
| 97 |
|
| 98 |
void |
| 99 |
pfdetach() /* release persist (and header) resources */ |
| 100 |
{ |
| 101 |
if (persistfd >= 0) |
| 102 |
close(persistfd); |
| 103 |
persistfd = -1; |
| 104 |
persistfname = NULL; |
| 105 |
inpname[0] = '\0'; |
| 106 |
outpname[0] = '\0'; |
| 107 |
errname[0] = '\0'; |
| 108 |
headismine = 0; |
| 109 |
} |
| 110 |
|
| 111 |
|
| 112 |
void |
| 113 |
pfclean() /* clean up persist files */ |
| 114 |
{ |
| 115 |
if (persistfd >= 0) |
| 116 |
close(persistfd); |
| 117 |
if (persistfname != NULL) |
| 118 |
unlink(persistfname); |
| 119 |
if (inpname[0]) |
| 120 |
unlink(inpname); |
| 121 |
if (outpname[0]) |
| 122 |
unlink(outpname); |
| 123 |
if (errname[0]) |
| 124 |
unlink(errname); |
| 125 |
} |
| 126 |
|
| 127 |
|
| 128 |
void |
| 129 |
pflock(lf) /* place or release exclusive lock on file */ |
| 130 |
int lf; |
| 131 |
{ |
| 132 |
struct flock fls; |
| 133 |
|
| 134 |
fls.l_type = lf ? F_WRLCK : F_UNLCK; |
| 135 |
fls.l_whence = 0; |
| 136 |
fls.l_start = 0L; |
| 137 |
fls.l_len = 0L; |
| 138 |
if (fcntl(persistfd, F_SETLKW, &fls) < 0) |
| 139 |
error(SYSTEM, "cannot (un)lock persist file"); |
| 140 |
} |
| 141 |
|
| 142 |
|
| 143 |
persistfile(pfn) /* open persist file and lock it */ |
| 144 |
char *pfn; |
| 145 |
{ |
| 146 |
persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0644); |
| 147 |
if (persistfd >= 0) { |
| 148 |
persistfname = pfn; |
| 149 |
pflock(1); |
| 150 |
return; |
| 151 |
} |
| 152 |
/* file exists -- switch to i/o process */ |
| 153 |
persistfd = open(pfn, O_RDWR); |
| 154 |
if (persistfd < 0) { |
| 155 |
sprintf(errmsg, "cannot open persist file \"%s\"", pfn); |
| 156 |
error(SYSTEM, errmsg); |
| 157 |
} |
| 158 |
pflock(1); |
| 159 |
io_process(); /* never returns */ |
| 160 |
} |
| 161 |
|
| 162 |
|
| 163 |
static int got_io; |
| 164 |
|
| 165 |
static void sig_io() { got_io++; } |
| 166 |
|
| 167 |
static void sig_alrm() { quit(0); } |
| 168 |
|
| 169 |
|
| 170 |
void |
| 171 |
pfhold() /* holding pattern for idle rendering process */ |
| 172 |
{ |
| 173 |
void (*oldalrm)(); |
| 174 |
char buf[512]; |
| 175 |
register int n; |
| 176 |
/* close input and output descriptors */ |
| 177 |
close(fileno(stdin)); |
| 178 |
close(fileno(stdout)); |
| 179 |
if (errfile == NULL) |
| 180 |
close(fileno(stderr)); |
| 181 |
/* create named pipes for input and output */ |
| 182 |
if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0) |
| 183 |
goto createrr; |
| 184 |
if (mkfifo(mktemp(strcpy(outpname,TEMPLATE)), 0600) < 0) |
| 185 |
goto createrr; |
| 186 |
if (errfile == NULL && |
| 187 |
mkfifo(mktemp(strcpy(errname,TEMPLATE)), 0600) < 0) |
| 188 |
goto createrr; |
| 189 |
sprintf(buf, "%s %d\n%s\n%s\n%s\n", progname, getpid(), |
| 190 |
inpname, outpname, errname); |
| 191 |
n = strlen(buf); |
| 192 |
if (write(persistfd, buf, n) < n) |
| 193 |
error(SYSTEM, "error writing persist file"); |
| 194 |
lseek(persistfd, (off_t)0L, 0); |
| 195 |
/* wait TIMELIM for someone to signal us */ |
| 196 |
got_io = 0; |
| 197 |
signal(SIGIO, sig_io); |
| 198 |
oldalrm = (void (*)())signal(SIGALRM, sig_alrm); |
| 199 |
alarm(TIMELIM); |
| 200 |
pflock(0); /* unlock persist file for attach */ |
| 201 |
while (!got_io) |
| 202 |
pause(); /* wait for attach */ |
| 203 |
alarm(0); /* turn off alarm */ |
| 204 |
signal(SIGALRM, oldalrm); |
| 205 |
signal(SIGIO, SIG_DFL); |
| 206 |
pflock(1); /* grab persist file back */ |
| 207 |
/* someone wants us; reopen stdin and stdout */ |
| 208 |
/* |
| 209 |
if (freopen(inpname, "r", stdin) == NULL) |
| 210 |
goto openerr; |
| 211 |
if (freopen(outpname, "w", stdout) == NULL) |
| 212 |
goto openerr; |
| 213 |
*/ |
| 214 |
close(0); |
| 215 |
if (open(inpname, O_RDONLY) != 0) |
| 216 |
error(INTERNAL, "unexpected stdin file number"); |
| 217 |
clearerr(stdin); |
| 218 |
close(1); |
| 219 |
if (open(outpname, O_WRONLY) != 1) |
| 220 |
error(INTERNAL, "unexpected stdout file number"); |
| 221 |
sleep(3); /* give them a chance to open their pipes */ |
| 222 |
if (errname[0]) { |
| 223 |
close(2); |
| 224 |
if (open(errname, O_WRONLY) != 2) |
| 225 |
error(INTERNAL, "unexpected stderr file number"); |
| 226 |
unlink(errname); |
| 227 |
errname[0] = '\0'; |
| 228 |
} |
| 229 |
unlink(inpname); |
| 230 |
inpname[0] = '\0'; |
| 231 |
unlink(outpname); |
| 232 |
outpname[0] = '\0'; |
| 233 |
return; |
| 234 |
createrr: |
| 235 |
error(SYSTEM, "cannot create named pipes in pfhold"); |
| 236 |
openerr: |
| 237 |
error(SYSTEM, "cannot open named pipes in pfhold"); |
| 238 |
} |
| 239 |
|
| 240 |
|
| 241 |
void |
| 242 |
io_process() /* just act as go-between for actual process */ |
| 243 |
{ |
| 244 |
register char *cp; |
| 245 |
register int nr, n; |
| 246 |
char buf[BUFSIZ], *pfin, *pfout, *pferr; |
| 247 |
int pid, nfds; |
| 248 |
int fdout, fderr = -1; |
| 249 |
int status = 0; |
| 250 |
fd_set readfds, excepfds; |
| 251 |
/* load persist file */ |
| 252 |
n = 40; |
| 253 |
while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) { |
| 254 |
if (!n--) |
| 255 |
error(USER, "unattended persist file?"); |
| 256 |
pflock(0); |
| 257 |
sleep(3+(3*getpid()+random())%13); /* wait until ready */ |
| 258 |
pflock(1); |
| 259 |
} |
| 260 |
if (nr < 0) |
| 261 |
error(SYSTEM, "error reading persist file"); |
| 262 |
ftruncate(persistfd, (off_t)0L); /* truncate persist file */ |
| 263 |
pfdetach(); /* close & release persist file */ |
| 264 |
buf[nr] = '\0'; /* parse what we got */ |
| 265 |
if ((cp = index(buf, ' ')) == NULL) |
| 266 |
goto formerr; |
| 267 |
*cp++ = '\0'; |
| 268 |
if ((pid = atoi(cp)) <= 0) |
| 269 |
goto formerr; |
| 270 |
if ((cp = index(cp, '\n')) == NULL) |
| 271 |
goto formerr; |
| 272 |
pfin = ++cp; |
| 273 |
if ((cp = index(cp, '\n')) == NULL) |
| 274 |
goto formerr; |
| 275 |
*cp++ = '\0'; |
| 276 |
pfout = cp; |
| 277 |
if ((cp = index(cp, '\n')) == NULL) |
| 278 |
goto formerr; |
| 279 |
*cp++ = '\0'; |
| 280 |
pferr = cp; |
| 281 |
if ((cp = index(cp, '\n')) == NULL) |
| 282 |
goto formerr; |
| 283 |
*cp++ = '\0'; |
| 284 |
if (cp-buf != nr) |
| 285 |
goto formerr; |
| 286 |
if (strcmp(buf, progname)) { |
| 287 |
sprintf(errmsg, "persist file for %s, not %s", buf, progname); |
| 288 |
error(USER, errmsg); |
| 289 |
} |
| 290 |
/* wake up rendering process */ |
| 291 |
if (kill(pid, SIGIO) < 0) |
| 292 |
error(SYSTEM, "cannot signal rendering process in io_process"); |
| 293 |
/* fork child feeder process */ |
| 294 |
pid = fork(); |
| 295 |
if (pid < 0) |
| 296 |
error(SYSTEM, "fork failed in io_process"); |
| 297 |
if (pid == 0) { /* feeder loop */ |
| 298 |
int fdin; |
| 299 |
close(1); /* open input pipe */ |
| 300 |
if ((fdin = open(pfin, O_WRONLY)) < 0) |
| 301 |
error(SYSTEM, "cannot open feed pipe in io_process"); |
| 302 |
/* renderer stdin */ |
| 303 |
while ((nr = read(0, cp=buf, sizeof(buf))) > 0) { |
| 304 |
do { |
| 305 |
if ((n = write(fdin, cp, nr)) <= 0) |
| 306 |
goto writerr; |
| 307 |
cp += n; |
| 308 |
} while ((nr -= n) > 0); |
| 309 |
} |
| 310 |
if (nr < 0) |
| 311 |
goto readerr; |
| 312 |
_exit(0); |
| 313 |
} |
| 314 |
close(0); |
| 315 |
/* open output pipes, in order */ |
| 316 |
if ((fdout = open(pfout, O_RDONLY)) < 0) |
| 317 |
error(SYSTEM, "cannot open output pipe in io_process"); |
| 318 |
if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0) |
| 319 |
error(SYSTEM, "cannot open error pipe in io_process"); |
| 320 |
for ( ; ; ) { /* eater loop */ |
| 321 |
FD_ZERO(&readfds); |
| 322 |
FD_ZERO(&excepfds); |
| 323 |
nfds = 0; |
| 324 |
if (fdout >= 0) { |
| 325 |
FD_SET(fdout, &readfds); |
| 326 |
FD_SET(fdout, &excepfds); |
| 327 |
nfds = fdout+1; |
| 328 |
} |
| 329 |
if (fderr >= 0) { |
| 330 |
FD_SET(fderr, &readfds); |
| 331 |
FD_SET(fderr, &excepfds); |
| 332 |
nfds = fderr+1; |
| 333 |
} |
| 334 |
if (nfds == 0) |
| 335 |
break; /* all done, exit */ |
| 336 |
if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0) |
| 337 |
error(SYSTEM, "error in select call in io_process"); |
| 338 |
/* renderer stderr */ |
| 339 |
if (fderr >= 0 && (FD_ISSET(fderr, &readfds) || |
| 340 |
FD_ISSET(fderr, &excepfds))) { |
| 341 |
nr = read(fderr, cp=buf, sizeof(buf)); |
| 342 |
if (nr < 0) |
| 343 |
goto readerr; |
| 344 |
if (nr == 0) { |
| 345 |
close(fderr); |
| 346 |
/* close(2); don't close stderr! */ |
| 347 |
fderr = -1; |
| 348 |
} else { |
| 349 |
cp[nr] = '\0'; /* deduce status if we can */ |
| 350 |
n = strlen(progname); |
| 351 |
if (!strncmp(cp, progname, n) && |
| 352 |
cp[n++] == ':' && |
| 353 |
cp[n++] == ' ') { |
| 354 |
register struct erract *ep; |
| 355 |
for (ep = erract; ep < erract+NERRS; |
| 356 |
ep++) |
| 357 |
if (ep->pre[0] && |
| 358 |
!strncmp(cp+n, ep->pre, |
| 359 |
strlen(ep->pre))) { |
| 360 |
status = ep->ec; |
| 361 |
break; |
| 362 |
} |
| 363 |
} |
| 364 |
do { /* write message */ |
| 365 |
if ((n = write(2, cp, nr)) <= 0) |
| 366 |
goto writerr; |
| 367 |
cp += n; |
| 368 |
} while ((nr -= n) > 0); |
| 369 |
} |
| 370 |
} |
| 371 |
/* renderer stdout */ |
| 372 |
if (fdout >= 0 && (FD_ISSET(fdout, &readfds) || |
| 373 |
FD_ISSET(fdout, &excepfds))) { |
| 374 |
nr = read(fdout, cp=buf, sizeof(buf)); |
| 375 |
if (nr < 0) |
| 376 |
goto readerr; |
| 377 |
if (nr == 0) { /* EOF */ |
| 378 |
close(fdout); |
| 379 |
close(1); |
| 380 |
fdout = -1; |
| 381 |
} else |
| 382 |
do { /* write it all */ |
| 383 |
if ((n = write(1, cp, nr)) <= 0) |
| 384 |
goto writerr; |
| 385 |
cp += n; |
| 386 |
} while ((nr -= n) > 0); |
| 387 |
} |
| 388 |
} |
| 389 |
wait(0); /* wait for feeder process */ |
| 390 |
_exit(status); |
| 391 |
formerr: |
| 392 |
error(USER, "format error in persist file"); |
| 393 |
readerr: |
| 394 |
error(SYSTEM, "read error in io_process"); |
| 395 |
writerr: |
| 396 |
error(SYSTEM, "write error in io_process"); |
| 397 |
} |
| 398 |
|
| 399 |
#else |
| 400 |
|
| 401 |
void pfclean() {} |
| 402 |
|
| 403 |
#endif |
