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/* Copyright (c) 1999 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines for managing holodeck files |
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* |
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/* allocate and clear beam list */ |
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hp->bl = (BEAM **)malloc((nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
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if (hp->bl == NULL) { |
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free((char *)hp); |
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free((void *)hp); |
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return(NULL); |
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} |
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bzero((char *)hp->bl, (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
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} |
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hdfragl[fd].nlinks++; |
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hdfragl[fd].writable = wr; /* set writable flag */ |
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hdfragl[fd].flen = lseek(fd, 0L, 2); /* get file length */ |
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hdfragl[fd].flen = lseek(fd, (off_t)0L, 2); /* get file length */ |
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} |
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if (fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks) |
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return; |
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if (!--hdfragl[fd].nlinks && hdfragl[fd].nfrags) { |
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free((char *)hdfragl[fd].fi); |
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free((void *)hdfragl[fd].fi); |
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hdfragl[fd].fi = NULL; |
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hdfragl[fd].nfrags = 0; |
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} |
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register int n; |
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/* prepare for system errors */ |
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errno = 0; |
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if ((fpos = lseek(fd, 0L, 1)) < 0) |
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if ((fpos = lseek(fd, (off_t)0L, 1)) < 0) |
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error(SYSTEM, "cannot determine holodeck file position"); |
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if (hproto == NULL) { /* assume we're loading it */ |
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HDGRID hpr; |
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if (fd < nhdfragls && hdfragl[fd].nlinks) |
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writable = hdfragl[fd].writable; |
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else |
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writable = lseek(fd, fpos, 0) == fpos && |
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writable = lseek(fd, (off_t)fpos, 0) == fpos && |
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write(fd, (char *)hp, sizeof(HDGRID)) == |
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sizeof(HDGRID); |
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} else { /* else assume we're creating it */ |
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register int j; |
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if (!hp->dirty++) { /* write smudge first time */ |
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if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), 0) < 0 |
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if (lseek(hp->fd, (off_t)(biglob(hp)->fo+(i-1)*sizeof(BEAMI)), 0) < 0 |
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|| write(hp->fd, (char *)&smudge, |
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sizeof(BEAMI)) != sizeof(BEAMI)) |
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error(SYSTEM, "seek/write error in hdmarkdirty"); |
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return(0); |
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errno = 0; /* write dirty segments */ |
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for (j = 0; j < hp->dirty; j++) { |
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if (lseek(hp->fd, biglob(hp)->fo + |
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(hp->dirseg[j].s-1)*sizeof(BEAMI), 0) < 0) |
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if (lseek(hp->fd, (off_t)(biglob(hp)->fo + |
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(hp->dirseg[j].s-1)*sizeof(BEAMI)), 0) < 0) |
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error(SYSTEM, "cannot seek on holodeck file"); |
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n = hp->dirseg[j].n * sizeof(BEAMI); |
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if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
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if (fd < 0) |
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return(-1); |
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if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
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if ((fpos = lseek(fd, 0L, 1)) < 0) |
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if ((fpos = lseek(fd, (off_t)0L, 1)) < 0) |
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return(-1); |
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flen = lseek(fd, 0L, 2); |
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lseek(fd, fpos, 0); |
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flen = lseek(fd, (off_t)0L, 2); |
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lseek(fd, (off_t)fpos, 0); |
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return(flen); |
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} |
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return(hdfragl[fd].flen); |
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blglob(hp)->nrm += n; |
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if ((n = hp->bl[i]->nrm = hp->bi[i].nrd)) { |
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errno = 0; |
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if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
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if (lseek(hp->fd, (off_t)hp->bi[i].fo, 0) < 0) |
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error(SYSTEM, "seek error on holodeck file"); |
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n *= sizeof(RAYVAL); |
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if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
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hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdgetbeam"); |
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blglob(hp)->nrm += hp->bl[i]->nrm = n; |
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errno = 0; |
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if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
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if (lseek(hp->fd, (off_t)hp->bi[i].fo, 0) < 0) |
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error(SYSTEM, "seek error on holodeck file"); |
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n *= sizeof(RAYVAL); |
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if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
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if (nrays) { /* get and write new fragment */ |
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nfo = hdallocfrag(hp->fd, nrays); |
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errno = 0; |
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if (lseek(hp->fd, nfo, 0) < 0) |
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if (lseek(hp->fd, (off_t)nfo, 0) < 0) |
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error(SYSTEM, "cannot seek on holodeck file"); |
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n = hp->bl[i]->nrm * sizeof(RAYVAL); |
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if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
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if (nchanged) |
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hdsyncbeam(hp, i); /* write new fragment */ |
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blglob(hp)->nrm -= hp->bl[i]->nrm; |
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free((char *)hp->bl[i]); /* free memory */ |
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free((void *)hp->bl[i]); /* free memory */ |
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hp->bl[i] = NULL; |
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return(nchanged); |
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} |
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"hdkillbeam called on read-only holodeck"); |
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if (hp->bl[i] != NULL) { /* free memory */ |
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blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
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free((char *)hp->bl[i]); |
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free((void *)hp->bl[i]); |
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hp->bl[i] = NULL; |
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} else |
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nchanged = hp->bi[i].nrd; |
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if (hp == NULL) { /* NULL means clean up everything */ |
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while (hdlist[0] != NULL) |
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hddone(hdlist[0]); |
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free((char *)hdfragl); |
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free((void *)hdfragl); |
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hdfragl = NULL; nhdfragls = 0; |
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return; |
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} |
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i++; |
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break; |
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} |
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free((char *)hp->bl); /* free beam list */ |
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free((char *)hp); /* free holodeck struct */ |
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free((void *)hp->bl); /* free beam list */ |
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free((void *)hp); /* free holodeck struct */ |
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} |