10 |
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#include "standard.h" |
12 |
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#include <fcntl.h> |
13 |
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#include <signal.h> |
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#include "color.h" |
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#include "view.h" |
16 |
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#include "resolu.h" |
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|
18 |
+ |
/* set the following to 0 to forgo forking */ |
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#ifndef MAXFORK |
20 |
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#define MAXFORK 3 /* allotment of duped processes */ |
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#endif |
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|
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/* rpict command */ |
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char *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"}; |
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int rpargc = 9; |
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int rpd[3]; |
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FILE *torp, *fromrp; |
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< |
COLR *scanline; |
28 |
> |
COLR *pbuf; |
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/* our view parameters */ |
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VIEW ourview = STDVIEW; |
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double pixaspect = 1.0; |
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int outfd; |
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long scanorig; |
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int syncfd = -1; /* lock file descriptor */ |
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int nforked = 0; |
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|
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char *progname; |
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int verbose = 0; |
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|
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extern long lseek(), ftell(); |
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|
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int gotalrm = 0; |
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int onalrm() { gotalrm++; } |
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|
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|
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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} |
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init(argc, argv); |
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rpiece(); |
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rval = cleanup(); |
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rval = cleanup(0); |
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exit(rval); |
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} |
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|
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getheader(fp, NULL); /* skip header */ |
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if (fscnresolu(&hr, &vr, fp) < 0 || /* check resolution */ |
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hr != hres*hmult || vr != vres*vmult) { |
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fprintf(stderr, "%s: picture resolution mismatch\n", |
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outfile); |
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fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n", |
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progname, outfile); |
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exit(1); |
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} |
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} else { |
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fprintf(stderr, "%s: cannot open\n", outfile); |
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fprintf(stderr, "%s: cannot open file \"%s\"\n", |
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progname, outfile); |
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exit(1); |
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} |
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scanorig = ftell(fp); /* record position of first scanline */ |
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if (fclose(fp) == -1) /* done with stream i/o */ |
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goto filerr; |
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sync(); /* avoid NFS buffering */ |
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sync(); /* flush NFS buffers */ |
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/* start rpict process */ |
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if (open_process(rpd, rpargv) <= 0) { |
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fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]); |
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progname, rpargv[0]); |
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exit(1); |
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} |
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if ((scanline = (COLR *)malloc(hres*sizeof(COLR))) == NULL) { |
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if ((pbuf = (COLR *)malloc(hres*vres*sizeof(COLR))) == NULL) { |
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fprintf(stderr, "%s: out of memory\n", progname); |
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exit(1); |
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} |
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signal(SIGALRM, onalrm); |
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return; |
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filerr: |
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fprintf(stderr, "%s: file i/o error\n", outfile); |
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fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile); |
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exit(1); |
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} |
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|
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struct flock fls; |
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char buf[64]; |
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|
214 |
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if (syncfd != -1) { /* using sync file */ |
214 |
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if (gotalrm) /* someone wants us to quit */ |
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return(0); |
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if (syncfd != -1) { /* use sync file */ |
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fls.l_type = F_WRLCK; /* gain exclusive access */ |
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fls.l_whence = 0; |
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fls.l_start = 0L; |
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lseek(syncfd, 0L, 0); |
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buf[read(syncfd, buf, sizeof(buf)-1)] = '\0'; |
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if (sscanf(buf, "%*d %*d %d %d", xp, yp) < 2) { |
211 |
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*xp = hmult; |
212 |
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*yp = vmult-1; |
213 |
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} |
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if (--(*xp) < 0) { /* decrement position */ |
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*xp = hmult-1; |
226 |
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if (--(*yp) < 0) { /* all done! */ |
226 |
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*yp = vmult; |
227 |
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} |
228 |
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if (--(*yp) < 0) { /* decrement position */ |
229 |
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*yp = vmult-1; |
230 |
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if (--(*xp) < 0) { /* all done! */ |
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close(syncfd); |
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return(0); |
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} |
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fcntl(syncfd, F_SETLKW, &fls); |
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return(1); |
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} |
242 |
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if (fgets(buf, sizeof(buf), stdin) == NULL) /* using stdin */ |
242 |
> |
if (fgets(buf, sizeof(buf), stdin) == NULL) /* use stdin */ |
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return(0); |
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if (sscanf(buf, "%d %d", xp, yp) == 2) |
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return(1); |
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fprintf(stderr, "%s: input format error\n", progname); |
247 |
< |
exit(1); |
247 |
> |
exit(cleanup(1)); |
248 |
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} |
249 |
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|
250 |
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|
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int |
252 |
< |
cleanup() /* close rpict process and clean up */ |
252 |
> |
cleanup(rstat) /* close rpict process and clean up */ |
253 |
> |
int rstat; |
254 |
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{ |
255 |
< |
register int rpstat; |
255 |
> |
int status; |
256 |
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|
257 |
< |
free((char *)scanline); |
257 |
> |
free((char *)pbuf); |
258 |
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fclose(torp); |
259 |
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fclose(fromrp); |
260 |
< |
rpstat = close_process(rpd); |
261 |
< |
if (rpstat == -1) |
262 |
< |
rpstat = 0; |
263 |
< |
return(rpstat); |
260 |
> |
while (wait(&status) != -1) |
261 |
> |
if (rstat == 0) |
262 |
> |
rstat = status>>8 & 0xff; |
263 |
> |
return(rstat); |
264 |
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} |
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|
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|
292 |
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default: |
293 |
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fprintf(stderr, "%s: unknown view type '-vt%c'\n", |
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progname, ourview.type); |
295 |
< |
exit(1); |
295 |
> |
exit(cleanup(1)); |
296 |
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} |
297 |
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pview.hoff += xorg - 0.5*(hmult-1); |
298 |
|
pview.voff += yorg - 0.5*(vmult-1); |
309 |
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} |
310 |
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|
311 |
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|
312 |
+ |
int |
313 |
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putpiece(xpos, ypos) /* get next piece from rpict */ |
314 |
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int xpos, ypos; |
315 |
|
{ |
316 |
+ |
struct flock fls; |
317 |
+ |
int pid, status; |
318 |
|
int hr, vr; |
319 |
< |
int y; |
320 |
< |
|
319 |
> |
register int y; |
320 |
> |
/* check bounds */ |
321 |
|
if (xpos < 0 | ypos < 0 | xpos >= hmult | ypos >= vmult) { |
322 |
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fprintf(stderr, "%s: requested piece (%d,%d) out of range\n", |
323 |
|
progname, xpos, ypos); |
324 |
< |
exit(1); |
324 |
> |
exit(cleanup(1)); |
325 |
|
} |
326 |
< |
getheader(fromrp, NULL); /* discard header info. */ |
327 |
< |
if (fscnresolu(&hr, &vr, fromrp) < 0 || /* check resolution */ |
328 |
< |
hr != hres || vr != vres) { |
326 |
> |
/* check header from rpict */ |
327 |
> |
getheader(fromrp, NULL); |
328 |
> |
if (fscnresolu(&hr, &vr, fromrp) < 0 || hr != hres || vr != vres) { |
329 |
|
fprintf(stderr, "%s: resolution mismatch from %s\n", |
330 |
|
progname, rpargv[0]); |
331 |
< |
exit(1); |
331 |
> |
exit(cleanup(1)); |
332 |
|
} |
333 |
< |
for (y = 0; y < vr; y++) { /* transfer scanlines */ |
334 |
< |
if (freadcolrs(scanline, hr, fromrp) < 0) { |
333 |
> |
/* load new piece into buffer */ |
334 |
> |
for (y = 0; y < vr; y++) |
335 |
> |
if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) { |
336 |
|
fprintf(stderr, "%s: read error from %s\n", |
337 |
|
progname, rpargv[0]); |
338 |
< |
exit(1); |
338 |
> |
exit(cleanup(1)); |
339 |
|
} |
340 |
< |
if ((y == 0 || hmult != 1) && lseek(outfd, |
341 |
< |
scanorig+((long)((vmult-1-ypos)*vres+y)*hmult*hres+xpos*hres)*sizeof(COLR), |
342 |
< |
0) == -1) { |
343 |
< |
fprintf(stderr, "%s: seek error\n", outfile); |
344 |
< |
exit(1); |
340 |
> |
#if MAXFORK |
341 |
> |
/* fork so we don't slow rpict down */ |
342 |
> |
if ((pid = fork()) > 0) { |
343 |
> |
if (++nforked >= MAXFORK) { |
344 |
> |
wait(&status); /* reap a child */ |
345 |
> |
if (status) |
346 |
> |
exit(cleanup(status>>8 & 0xff)); |
347 |
> |
nforked--; |
348 |
|
} |
349 |
< |
if (writebuf(outfd, (char *)scanline, hr*sizeof(COLR)) != |
350 |
< |
hr*sizeof(COLR)) { |
351 |
< |
fprintf(stderr, "%s: write error\n", outfile); |
352 |
< |
exit(1); |
349 |
> |
return(pid); |
350 |
> |
} |
351 |
> |
#else |
352 |
> |
pid = -1; /* no forking */ |
353 |
> |
#endif |
354 |
> |
/* lock file section so NFS doesn't mess up */ |
355 |
> |
fls.l_whence = 0; |
356 |
> |
fls.l_len = (long)vres*hmult*hres*sizeof(COLR); |
357 |
> |
fls.l_start = scanorig + (vmult-1-ypos)*fls.l_len; |
358 |
> |
fls.l_type = F_WRLCK; |
359 |
> |
fcntl(outfd, F_SETLKW, &fls); |
360 |
> |
/* write new piece to file */ |
361 |
> |
if (lseek(outfd, fls.l_start+(long)xpos*hres*sizeof(COLR), 0) == -1) |
362 |
> |
goto seekerr; |
363 |
> |
if (hmult == 1) { |
364 |
> |
if (writebuf(outfd, (char *)pbuf, |
365 |
> |
vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR)) |
366 |
> |
goto writerr; |
367 |
> |
} else |
368 |
> |
for (y = 0; y < vr; y++) { |
369 |
> |
if (writebuf(outfd, (char *)(pbuf+y*hr), |
370 |
> |
hr*sizeof(COLR)) != hr*sizeof(COLR)) |
371 |
> |
goto writerr; |
372 |
> |
if (y < vr-1 && lseek(outfd, |
373 |
> |
(long)(hmult-1)*hr*sizeof(COLR), |
374 |
> |
1) == -1) |
375 |
> |
goto seekerr; |
376 |
|
} |
377 |
+ |
if (pid == -1) { /* fork failed */ |
378 |
+ |
fls.l_type = F_UNLCK; /* release lock */ |
379 |
+ |
fcntl(outfd, F_SETLKW, &fls); |
380 |
+ |
return(0); |
381 |
|
} |
382 |
+ |
_exit(0); /* else exit child process (releasing lock) */ |
383 |
+ |
seekerr: |
384 |
+ |
fprintf(stderr, "%s: seek error on file \"%s\"\n", progname, outfile); |
385 |
+ |
_exit(1); |
386 |
+ |
writerr: |
387 |
+ |
fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile); |
388 |
+ |
_exit(1); |
389 |
|
} |