| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: rpiece.c,v 2.50 2009/02/07 05:40:47 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Generate sections of a picture. |
| 6 |
*/ |
| 7 |
|
| 8 |
|
| 9 |
#include <stdio.h> |
| 10 |
#include <signal.h> |
| 11 |
#include <sys/types.h> |
| 12 |
|
| 13 |
#include "platform.h" |
| 14 |
#ifndef NON_POSIX /* XXX need abstraction for process management */ |
| 15 |
#include <sys/wait.h> |
| 16 |
#endif |
| 17 |
|
| 18 |
#include "standard.h" |
| 19 |
#include "color.h" |
| 20 |
#include "view.h" |
| 21 |
#include "rtprocess.h" |
| 22 |
|
| 23 |
#ifndef F_SETLKW |
| 24 |
|
| 25 |
int |
| 26 |
main( |
| 27 |
int argc, |
| 28 |
char *argv[] |
| 29 |
) |
| 30 |
{ |
| 31 |
fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]); |
| 32 |
exit(1); |
| 33 |
} |
| 34 |
|
| 35 |
#else |
| 36 |
|
| 37 |
#ifndef NFS |
| 38 |
#define NFS 1 |
| 39 |
#endif |
| 40 |
/* set the following to 0 to forgo forking */ |
| 41 |
#ifndef MAXFORK |
| 42 |
#if NFS |
| 43 |
#define MAXFORK 3 /* allotment of duped processes */ |
| 44 |
#else |
| 45 |
#define MAXFORK 0 |
| 46 |
#endif |
| 47 |
#endif |
| 48 |
/* protection from SYSV signals(!) */ |
| 49 |
#if defined(sgi) |
| 50 |
#define guard_io() sighold(SIGALRM) |
| 51 |
#define unguard() sigrelse(SIGALRM) |
| 52 |
#endif |
| 53 |
#ifndef guard_io |
| 54 |
#define guard_io() |
| 55 |
#define unguard() |
| 56 |
#endif |
| 57 |
|
| 58 |
extern char *strerror(); |
| 59 |
|
| 60 |
/* rpict command */ |
| 61 |
char *rpargv[128] = {"rpict", "-S", "1"}; |
| 62 |
int rpargc = 3; |
| 63 |
FILE *torp, *fromrp; |
| 64 |
COLR *pbuf; |
| 65 |
/* our view parameters */ |
| 66 |
VIEW ourview = STDVIEW; |
| 67 |
double pixaspect = 1.0; |
| 68 |
int hres = 1024, vres = 1024, hmult = 4, vmult = 4; |
| 69 |
/* output file */ |
| 70 |
char *outfile = NULL; |
| 71 |
int outfd; |
| 72 |
long scanorig; |
| 73 |
FILE *syncfp = NULL; /* synchronization file pointer */ |
| 74 |
int synclst = F_UNLCK; /* synchronization file lock status */ |
| 75 |
int nforked = 0; |
| 76 |
|
| 77 |
#define sflock(t) if ((t)!=synclst) dolock(fileno(syncfp),synclst=t) |
| 78 |
|
| 79 |
char *progname; |
| 80 |
int verbose = 0; |
| 81 |
unsigned timelim = 0; |
| 82 |
int rvrlim = -1; |
| 83 |
|
| 84 |
int gotalrm = 0; |
| 85 |
void onalrm(int i) { gotalrm++; } |
| 86 |
|
| 87 |
static void dolock(int fd, int ltyp); |
| 88 |
static void init(int ac, char **av); |
| 89 |
static int nextpiece(int *xp, int *yp); |
| 90 |
static int rvrpiece(int *xp, int *yp); |
| 91 |
static int cleanup(int rstat); |
| 92 |
static void rpiece(void); |
| 93 |
static int putpiece(int xpos, int ypos); |
| 94 |
static void filerr(char *t); |
| 95 |
|
| 96 |
|
| 97 |
int |
| 98 |
main( |
| 99 |
int argc, |
| 100 |
char *argv[] |
| 101 |
) |
| 102 |
{ |
| 103 |
register int i, rval; |
| 104 |
|
| 105 |
progname = argv[0]; |
| 106 |
for (i = 1; i < argc; i++) { |
| 107 |
/* expand arguments */ |
| 108 |
while ((rval = expandarg(&argc, &argv, i)) > 0) |
| 109 |
; |
| 110 |
if (rval < 0) { |
| 111 |
fprintf(stderr, "%s: cannot expand '%s'\n", |
| 112 |
argv[0], argv[i]); |
| 113 |
exit(1); |
| 114 |
} |
| 115 |
if (argv[i][0] == '-') |
| 116 |
switch (argv[i][1]) { |
| 117 |
case 'v': |
| 118 |
switch (argv[i][2]) { |
| 119 |
case '\0': /* verbose option */ |
| 120 |
verbose = !verbose; |
| 121 |
continue; |
| 122 |
case 'f': /* view file */ |
| 123 |
if (viewfile(argv[++i], &ourview, NULL) <= 0) { |
| 124 |
fprintf(stderr, |
| 125 |
"%s: not a view file\n", argv[i]); |
| 126 |
exit(1); |
| 127 |
} |
| 128 |
continue; |
| 129 |
default: /* view option? */ |
| 130 |
rval = getviewopt(&ourview, argc-i, argv+i); |
| 131 |
if (rval >= 0) { |
| 132 |
i += rval; |
| 133 |
continue; |
| 134 |
} |
| 135 |
break; |
| 136 |
} |
| 137 |
break; |
| 138 |
case 'p': /* pixel aspect ratio? */ |
| 139 |
if (argv[i][2] == 'm') { |
| 140 |
fprintf(stderr, "%s: -pm unsupported\n", |
| 141 |
argv[0]); |
| 142 |
++i; |
| 143 |
continue; |
| 144 |
} |
| 145 |
if (argv[i][2] != 'a' || argv[i][3]) |
| 146 |
break; |
| 147 |
pixaspect = atof(argv[++i]); |
| 148 |
continue; |
| 149 |
case 'T': /* time limit (hours) */ |
| 150 |
if (argv[i][2]) |
| 151 |
break; |
| 152 |
timelim = atof(argv[++i])*3600. + .5; |
| 153 |
continue; |
| 154 |
case 'x': /* overall x resolution */ |
| 155 |
if (argv[i][2]) |
| 156 |
break; |
| 157 |
hres = atoi(argv[++i]); |
| 158 |
continue; |
| 159 |
case 'y': /* overall y resolution */ |
| 160 |
if (argv[i][2]) |
| 161 |
break; |
| 162 |
vres = atoi(argv[++i]); |
| 163 |
continue; |
| 164 |
case 'X': /* horizontal multiplier */ |
| 165 |
if (argv[i][2]) |
| 166 |
break; |
| 167 |
hmult = atoi(argv[++i]); |
| 168 |
continue; |
| 169 |
case 'Y': /* vertical multiplier */ |
| 170 |
if (argv[i][2]) |
| 171 |
break; |
| 172 |
vmult = atoi(argv[++i]); |
| 173 |
continue; |
| 174 |
case 'R': /* recover */ |
| 175 |
if (argv[i][2]) |
| 176 |
break; |
| 177 |
rvrlim = 0; |
| 178 |
/* fall through */ |
| 179 |
case 'F': /* syncronization file */ |
| 180 |
if (argv[i][2]) |
| 181 |
break; |
| 182 |
if ((syncfp = |
| 183 |
fdopen(open(argv[++i],O_RDWR|O_CREAT,0666),"r+")) == NULL) { |
| 184 |
fprintf(stderr, "%s: cannot open\n", |
| 185 |
argv[i]); |
| 186 |
exit(1); |
| 187 |
} |
| 188 |
continue; |
| 189 |
case 'z': /* z-file ist verbotten */ |
| 190 |
fprintf(stderr, "%s: -z option not allowed\n", |
| 191 |
argv[0]); |
| 192 |
exit(1); |
| 193 |
case 'o': /* output file */ |
| 194 |
if (argv[i][2]) |
| 195 |
break; |
| 196 |
outfile = argv[++i]; |
| 197 |
continue; |
| 198 |
} else if (i >= argc-1) |
| 199 |
break; |
| 200 |
rpargv[rpargc++] = argv[i]; |
| 201 |
} |
| 202 |
if (i >= argc) { |
| 203 |
fprintf(stderr, "%s: missing octree argument\n", argv[0]); |
| 204 |
exit(1); |
| 205 |
} |
| 206 |
if (outfile == NULL) { |
| 207 |
fprintf(stderr, "%s: missing output file\n", argv[0]); |
| 208 |
exit(1); |
| 209 |
} |
| 210 |
init(argc, argv); |
| 211 |
rpiece(); |
| 212 |
exit(cleanup(0)); |
| 213 |
} |
| 214 |
|
| 215 |
|
| 216 |
static void |
| 217 |
dolock( /* lock or unlock a file */ |
| 218 |
int fd, |
| 219 |
int ltyp |
| 220 |
) |
| 221 |
{ |
| 222 |
static struct flock fls; /* static so initialized to zeroes */ |
| 223 |
|
| 224 |
fls.l_type = ltyp; |
| 225 |
if (fcntl(fd, F_SETLKW, &fls) < 0) { |
| 226 |
fprintf(stderr, "%s: cannot lock/unlock file: %s\n", |
| 227 |
progname, strerror(errno)); |
| 228 |
exit(1); |
| 229 |
} |
| 230 |
} |
| 231 |
|
| 232 |
|
| 233 |
static void |
| 234 |
init( /* set up output file and start rpict */ |
| 235 |
int ac, |
| 236 |
char **av |
| 237 |
) |
| 238 |
{ |
| 239 |
static char hrbuf[16], vrbuf[16]; |
| 240 |
extern char VersionID[]; |
| 241 |
char *err; |
| 242 |
FILE *fp; |
| 243 |
int hr, vr; |
| 244 |
SUBPROC rpd; /* since we don't close_process(), this can be local */ |
| 245 |
/* set up view */ |
| 246 |
if ((err = setview(&ourview)) != NULL) { |
| 247 |
fprintf(stderr, "%s: %s\n", progname, err); |
| 248 |
exit(1); |
| 249 |
} |
| 250 |
if (syncfp != NULL) { |
| 251 |
sflock(F_RDLCK); |
| 252 |
fscanf(syncfp, "%d %d", &hmult, &vmult); |
| 253 |
sflock(F_UNLCK); |
| 254 |
} |
| 255 |
/* compute piece size */ |
| 256 |
hres /= hmult; |
| 257 |
vres /= vmult; |
| 258 |
if (hres <= 0 || vres <= 0) { |
| 259 |
fprintf(stderr, "%s: illegal resolution/subdivision\n", progname); |
| 260 |
exit(1); |
| 261 |
} |
| 262 |
normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres); |
| 263 |
sprintf(hrbuf, "%d", hres); |
| 264 |
rpargv[rpargc++] = "-x"; rpargv[rpargc++] = hrbuf; |
| 265 |
sprintf(vrbuf, "%d", vres); |
| 266 |
rpargv[rpargc++] = "-y"; rpargv[rpargc++] = vrbuf; |
| 267 |
rpargv[rpargc++] = "-pa"; rpargv[rpargc++] = "0"; |
| 268 |
rpargv[rpargc++] = av[ac-1]; |
| 269 |
rpargv[rpargc] = NULL; |
| 270 |
/* open output file */ |
| 271 |
if ((outfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) >= 0) { |
| 272 |
dolock(outfd, F_WRLCK); |
| 273 |
if ((fp = fdopen(dup(outfd), "w")) == NULL) |
| 274 |
goto filerr; |
| 275 |
newheader("RADIANCE", fp); /* create header */ |
| 276 |
printargs(ac, av, fp); |
| 277 |
fprintf(fp, "SOFTWARE= %s\n", VersionID); |
| 278 |
fputs(VIEWSTR, fp); |
| 279 |
fprintview(&ourview, fp); |
| 280 |
putc('\n', fp); |
| 281 |
if (pixaspect < .99 || pixaspect > 1.01) |
| 282 |
fputaspect(pixaspect, fp); |
| 283 |
fputformat(COLRFMT, fp); |
| 284 |
putc('\n', fp); |
| 285 |
fprtresolu(hres*hmult, vres*vmult, fp); |
| 286 |
} else if ((outfd = open(outfile, O_RDWR)) >= 0) { |
| 287 |
dolock(outfd, F_RDLCK); |
| 288 |
if ((fp = fdopen(dup(outfd), "r+")) == NULL) |
| 289 |
goto filerr; |
| 290 |
getheader(fp, NULL, NULL); /* skip header */ |
| 291 |
if (!fscnresolu(&hr, &vr, fp) || /* check resolution */ |
| 292 |
hr != hres*hmult || vr != vres*vmult) { |
| 293 |
fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n", |
| 294 |
progname, outfile); |
| 295 |
exit(1); |
| 296 |
} |
| 297 |
} else { |
| 298 |
fprintf(stderr, "%s: cannot open file \"%s\"\n", |
| 299 |
progname, outfile); |
| 300 |
exit(1); |
| 301 |
} |
| 302 |
scanorig = ftell(fp); /* record position of first scanline */ |
| 303 |
if (fclose(fp) == -1) /* done with stream i/o */ |
| 304 |
goto filerr; |
| 305 |
dolock(outfd, F_UNLCK); |
| 306 |
/* start rpict process */ |
| 307 |
if (open_process(&rpd, rpargv) <= 0) { |
| 308 |
fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]); |
| 309 |
exit(1); |
| 310 |
} |
| 311 |
if ((fromrp = fdopen(rpd.r, "r")) == NULL || |
| 312 |
(torp = fdopen(rpd.w, "w")) == NULL) { |
| 313 |
fprintf(stderr, "%s: cannot open stream to %s\n", |
| 314 |
progname, rpargv[0]); |
| 315 |
exit(1); |
| 316 |
} |
| 317 |
if ((pbuf = (COLR *)bmalloc(hres*vres*sizeof(COLR))) == NULL) { |
| 318 |
fprintf(stderr, "%s: out of memory\n", progname); |
| 319 |
exit(1); |
| 320 |
} |
| 321 |
signal(SIGALRM, onalrm); |
| 322 |
if (timelim) |
| 323 |
alarm(timelim); |
| 324 |
return; |
| 325 |
filerr: |
| 326 |
fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile); |
| 327 |
exit(1); |
| 328 |
} |
| 329 |
|
| 330 |
|
| 331 |
static int |
| 332 |
nextpiece( /* get next piece assignment */ |
| 333 |
int *xp, |
| 334 |
int *yp |
| 335 |
) |
| 336 |
{ |
| 337 |
if (gotalrm) /* someone wants us to quit */ |
| 338 |
return(0); |
| 339 |
if (syncfp != NULL) { /* use sync file */ |
| 340 |
/* |
| 341 |
* So we don't necessarily have to lock and unlock the file |
| 342 |
* multiple times (very slow), we establish an exclusive |
| 343 |
* lock at the beginning on our synchronization file and |
| 344 |
* maintain it in the subroutine rvrpiece(). |
| 345 |
*/ |
| 346 |
sflock(F_WRLCK); |
| 347 |
fseek(syncfp, 0L, 0); /* read position */ |
| 348 |
if (fscanf(syncfp, "%*d %*d %d %d", xp, yp) < 2) { |
| 349 |
*xp = hmult-1; |
| 350 |
*yp = vmult; |
| 351 |
} |
| 352 |
if (rvrlim == 0) /* initialize recovery limit */ |
| 353 |
rvrlim = *xp*vmult + *yp; |
| 354 |
if (rvrpiece(xp, yp)) { /* do stragglers first */ |
| 355 |
sflock(F_UNLCK); |
| 356 |
return(1); |
| 357 |
} |
| 358 |
if (--(*yp) < 0) { /* decrement position */ |
| 359 |
*yp = vmult-1; |
| 360 |
if (--(*xp) < 0) { /* all done */ |
| 361 |
sflock(F_UNLCK); |
| 362 |
return(0); |
| 363 |
} |
| 364 |
} |
| 365 |
fseek(syncfp, 0L, 0); /* write new position */ |
| 366 |
fprintf(syncfp, "%4d %4d\n%4d %4d\n\n", hmult, vmult, *xp, *yp); |
| 367 |
fflush(syncfp); |
| 368 |
sflock(F_UNLCK); /* release sync file */ |
| 369 |
return(1); |
| 370 |
} |
| 371 |
return(scanf("%d %d", xp, yp) == 2); /* use stdin */ |
| 372 |
} |
| 373 |
|
| 374 |
|
| 375 |
static int |
| 376 |
rvrpiece( /* check for recoverable pieces */ |
| 377 |
register int *xp, |
| 378 |
register int *yp |
| 379 |
) |
| 380 |
{ |
| 381 |
static char *pdone = NULL; /* which pieces are done */ |
| 382 |
static long readpos = -1; /* how far we've read */ |
| 383 |
register int i; |
| 384 |
/* |
| 385 |
* This routine is called by nextpiece() with an |
| 386 |
* exclusive lock on syncfp and the file pointer at the |
| 387 |
* appropriate position to read in the finished pieces. |
| 388 |
*/ |
| 389 |
if (rvrlim < 0) |
| 390 |
return(0); /* only check if asked */ |
| 391 |
if (pdone == NULL) /* first call */ |
| 392 |
pdone = calloc(hmult*vmult, sizeof(char)); |
| 393 |
if (pdone == NULL) { |
| 394 |
fprintf(stderr, "%s: out of memory\n", progname); |
| 395 |
exit(1); |
| 396 |
} |
| 397 |
if (readpos != -1) /* mark what's been done */ |
| 398 |
fseek(syncfp, readpos, 0); |
| 399 |
while (fscanf(syncfp, "%d %d", xp, yp) == 2) |
| 400 |
pdone[*xp*vmult+*yp] = 1; |
| 401 |
if (!feof(syncfp)) { |
| 402 |
fprintf(stderr, "%s: format error in sync file\n", progname); |
| 403 |
exit(1); |
| 404 |
} |
| 405 |
readpos = ftell(syncfp); |
| 406 |
i = hmult*vmult; /* find an unaccounted for piece */ |
| 407 |
while (i-- > rvrlim) |
| 408 |
if (!pdone[i]) { |
| 409 |
*xp = i / vmult; |
| 410 |
*yp = i % vmult; |
| 411 |
pdone[i] = 1; /* consider it done */ |
| 412 |
return(1); |
| 413 |
} |
| 414 |
rvrlim = -1; /* nothing left to recover */ |
| 415 |
free(pdone); |
| 416 |
pdone = NULL; |
| 417 |
return(0); |
| 418 |
} |
| 419 |
|
| 420 |
|
| 421 |
static int |
| 422 |
cleanup( /* close rpict process and clean up */ |
| 423 |
int rstat |
| 424 |
) |
| 425 |
{ |
| 426 |
int status; |
| 427 |
|
| 428 |
bfree((char *)pbuf, hres*vres*sizeof(COLR)); |
| 429 |
fclose(torp); |
| 430 |
fclose(fromrp); |
| 431 |
while (wait(&status) != -1) |
| 432 |
if (rstat == 0) |
| 433 |
rstat = status>>8 & 0xff; |
| 434 |
return(rstat); |
| 435 |
} |
| 436 |
|
| 437 |
|
| 438 |
static void |
| 439 |
rpiece(void) /* render picture piece by piece */ |
| 440 |
{ |
| 441 |
VIEW pview; |
| 442 |
int xorg, yorg; |
| 443 |
/* compute view parameters */ |
| 444 |
pview = ourview; |
| 445 |
switch (ourview.type) { |
| 446 |
case VT_PER: |
| 447 |
pview.horiz = (2.*180./PI)*atan( |
| 448 |
tan((PI/180./2.)*ourview.horiz)/hmult ); |
| 449 |
pview.vert = (2.*180./PI)*atan( |
| 450 |
tan((PI/180./2.)*ourview.vert)/vmult ); |
| 451 |
break; |
| 452 |
case VT_PAR: |
| 453 |
case VT_ANG: |
| 454 |
pview.horiz = ourview.horiz / hmult; |
| 455 |
pview.vert = ourview.vert / vmult; |
| 456 |
break; |
| 457 |
case VT_CYL: |
| 458 |
pview.horiz = ourview.horiz / hmult; |
| 459 |
pview.vert = (2.*180./PI)*atan( |
| 460 |
tan((PI/180./2.)*ourview.vert)/vmult ); |
| 461 |
break; |
| 462 |
case VT_HEM: |
| 463 |
pview.horiz = (2.*180./PI)*asin( |
| 464 |
sin((PI/180./2.)*ourview.horiz)/hmult ); |
| 465 |
pview.vert = (2.*180./PI)*asin( |
| 466 |
sin((PI/180./2.)*ourview.vert)/vmult ); |
| 467 |
break; |
| 468 |
case VT_PLS: |
| 469 |
pview.horiz = sin((PI/180./2.)*ourview.horiz) / |
| 470 |
(1.0 + cos((PI/180./2.)*ourview.horiz)) / hmult; |
| 471 |
pview.horiz *= pview.horiz; |
| 472 |
pview.horiz = (2.*180./PI)*acos((1. - pview.horiz) / |
| 473 |
(1. + pview.horiz)); |
| 474 |
pview.vert = sin((PI/180./2.)*ourview.vert) / |
| 475 |
(1.0 + cos((PI/180./2.)*ourview.vert)) / vmult; |
| 476 |
pview.vert *= pview.vert; |
| 477 |
pview.vert = (2.*180./PI)*acos((1. - pview.vert) / |
| 478 |
(1. + pview.vert)); |
| 479 |
break; |
| 480 |
default: |
| 481 |
fprintf(stderr, "%s: unknown view type '-vt%c'\n", |
| 482 |
progname, ourview.type); |
| 483 |
exit(cleanup(1)); |
| 484 |
} |
| 485 |
/* render each piece */ |
| 486 |
while (nextpiece(&xorg, &yorg)) { |
| 487 |
pview.hoff = ourview.hoff*hmult + xorg - 0.5*(hmult-1); |
| 488 |
pview.voff = ourview.voff*vmult + yorg - 0.5*(vmult-1); |
| 489 |
fputs(VIEWSTR, torp); |
| 490 |
fprintview(&pview, torp); |
| 491 |
putc('\n', torp); |
| 492 |
fflush(torp); /* assigns piece to rpict */ |
| 493 |
putpiece(xorg, yorg); /* place piece in output */ |
| 494 |
} |
| 495 |
} |
| 496 |
|
| 497 |
|
| 498 |
static int |
| 499 |
putpiece( /* get next piece from rpict */ |
| 500 |
int xpos, |
| 501 |
int ypos |
| 502 |
) |
| 503 |
{ |
| 504 |
struct flock fls; |
| 505 |
int pid, status; |
| 506 |
int hr, vr; |
| 507 |
register int y; |
| 508 |
/* check bounds */ |
| 509 |
if ((xpos < 0) | (ypos < 0) | (xpos >= hmult) | (ypos >= vmult)) { |
| 510 |
fprintf(stderr, "%s: requested piece (%d,%d) out of range\n", |
| 511 |
progname, xpos, ypos); |
| 512 |
exit(cleanup(1)); |
| 513 |
} |
| 514 |
/* check header from rpict */ |
| 515 |
guard_io(); |
| 516 |
getheader(fromrp, NULL, NULL); |
| 517 |
if (!fscnresolu(&hr, &vr, fromrp) || (hr != hres) | (vr != vres)) { |
| 518 |
fprintf(stderr, "%s: resolution mismatch from %s\n", |
| 519 |
progname, rpargv[0]); |
| 520 |
exit(cleanup(1)); |
| 521 |
} |
| 522 |
if (verbose) { /* notify caller */ |
| 523 |
printf("%d %d begun\n", xpos, ypos); |
| 524 |
fflush(stdout); |
| 525 |
} |
| 526 |
unguard(); |
| 527 |
/* load new piece into buffer */ |
| 528 |
for (y = 0; y < vr; y++) { |
| 529 |
guard_io(); |
| 530 |
if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) { |
| 531 |
fprintf(stderr, "%s: read error from %s\n", |
| 532 |
progname, rpargv[0]); |
| 533 |
exit(cleanup(1)); |
| 534 |
} |
| 535 |
unguard(); |
| 536 |
} |
| 537 |
#if MAXFORK |
| 538 |
/* fork so we don't slow rpict down */ |
| 539 |
if ((pid = fork()) > 0) { |
| 540 |
if (++nforked >= MAXFORK) { |
| 541 |
wait(&status); /* reap a child */ |
| 542 |
if (status) |
| 543 |
exit(cleanup(status>>8 & 0xff)); |
| 544 |
nforked--; |
| 545 |
} |
| 546 |
return(pid); |
| 547 |
} |
| 548 |
#else |
| 549 |
pid = -1; /* no forking */ |
| 550 |
#endif |
| 551 |
fls.l_start = scanorig + |
| 552 |
((long)(vmult-1-ypos)*vres*hmult+xpos)*hres*sizeof(COLR); |
| 553 |
#if NFS |
| 554 |
fls.l_len = ((long)(vres-1)*hmult+1)*hres*sizeof(COLR); |
| 555 |
/* lock file section so NFS doesn't mess up */ |
| 556 |
fls.l_whence = 0; |
| 557 |
fls.l_type = F_WRLCK; |
| 558 |
if (fcntl(outfd, F_SETLKW, &fls) < 0) |
| 559 |
filerr("lock"); |
| 560 |
#endif |
| 561 |
/* write new piece to file */ |
| 562 |
if (lseek(outfd, (off_t)fls.l_start, SEEK_SET) < 0) |
| 563 |
filerr("seek"); |
| 564 |
if (hmult == 1) { |
| 565 |
if (writebuf(outfd, (char *)pbuf, |
| 566 |
vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR)) |
| 567 |
filerr("write"); |
| 568 |
} else |
| 569 |
for (y = 0; y < vr; y++) { |
| 570 |
if (writebuf(outfd, (char *)(pbuf+y*hr), |
| 571 |
hr*sizeof(COLR)) != hr*sizeof(COLR)) |
| 572 |
filerr("write"); |
| 573 |
if (y < vr-1 && lseek(outfd, |
| 574 |
(off_t)(hmult-1)*hr*sizeof(COLR), |
| 575 |
SEEK_CUR) < 0) |
| 576 |
filerr("seek"); |
| 577 |
} |
| 578 |
#if NFS |
| 579 |
fls.l_type = F_UNLCK; /* release lock */ |
| 580 |
if (fcntl(outfd, F_SETLKW, &fls) < 0) |
| 581 |
filerr("lock"); |
| 582 |
#endif |
| 583 |
if (verbose) { /* notify caller */ |
| 584 |
printf("%d %d done\n", xpos, ypos); |
| 585 |
fflush(stdout); |
| 586 |
} |
| 587 |
if (syncfp != NULL) { /* record what's been done */ |
| 588 |
sflock(F_WRLCK); |
| 589 |
fseek(syncfp, 0L, 2); /* append index */ |
| 590 |
fprintf(syncfp, "%4d %4d\n", xpos, ypos); |
| 591 |
fflush(syncfp); |
| 592 |
/*** Unlock not necessary, since |
| 593 |
sflock(F_UNLCK); _exit() or nextpiece() is next ***/ |
| 594 |
} |
| 595 |
if (pid == -1) /* didn't fork or fork failed */ |
| 596 |
return(0); |
| 597 |
_exit(0); /* else exit child process (releasing locks) */ |
| 598 |
} |
| 599 |
|
| 600 |
|
| 601 |
static void |
| 602 |
filerr( /* report file error and exit */ |
| 603 |
char *t |
| 604 |
) |
| 605 |
{ |
| 606 |
fprintf(stderr, "%s: %s error on file \"%s\": %s\n", |
| 607 |
progname, t, outfile, strerror(errno)); |
| 608 |
_exit(1); |
| 609 |
} |
| 610 |
|
| 611 |
#endif |
