src/util/rpiece.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 * Generate sections of a picture.
 */
 
#include "standard.h"
#include <fcntl.h>

#ifndef F_SETLKW

main(argc, argv)
int argc;
char *argv[];
{
        fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
        exit(1);
}

#else

#include <signal.h>
#include "color.h"
#include "view.h"
#include "resolu.h"

#ifndef NFS
#define  NFS                    1
#endif
                                /* set the following to 0 to forgo forking */
#ifndef MAXFORK
#if NFS
#define  MAXFORK                3       /* allotment of duped processes */
#else
#define  MAXFORK                0
#endif
#endif
                                        /* protection from SYSV signals(!) */
#if defined(sgi) || defined(hpux)
#define guard_io()      sighold(SIGALRM)
#define unguard()       sigrelse(SIGALRM)
#endif
#ifndef guard_io
#define guard_io()      0
#define unguard()       0
#endif
                                /* rpict command */
char  *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"};
int  rpargc = 9;
int  rpd[3];
FILE  *torp, *fromrp;
COLR  *pbuf;
                                /* our view parameters */
VIEW  ourview = STDVIEW;
double  pixaspect = 1.0;
int  hres = 512, vres = 512, hmult = 2, vmult = 2;
                                /* output file */
char  *outfile = NULL;
int  outfd;
long  scanorig;
int  syncfd = -1;               /* lock file descriptor */
int  nforked = 0;

char  *progname;
int  verbose = 0;

extern long  lseek(), ftell();

int  gotalrm = 0;
int  onalrm() { gotalrm++; }


main(argc, argv)
int  argc;
char  *argv[];
{
        register int  i, rval;
        
        progname = argv[0];
        for (i = 1; i < argc; i++) {
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'v':
                                switch (argv[i][2]) {
                                case '\0':      /* verbose option */
                                        verbose = !verbose;
                                        continue;
                                case 'f':       /* view file */
                                        if (viewfile(argv[++i], &ourview, NULL) <= 0) {
                                                fprintf(stderr,
                                        "%s: not a view file\n", argv[i]);
                                                exit(1);
                                        }
                                        continue;
                                default:        /* view option? */
                                        rval = getviewopt(&ourview, argc-i, argv+i);
                                        if (rval >= 0) {
                                                i += rval;
                                                continue;
                                        }
                                        break;
                                }
                                break;
                        case 'p':               /* pixel aspect ratio? */
                                if (argv[i][2] == 'a' && !argv[i][3])
                                        pixaspect = atof(argv[i+1]);
                                break;
                        case 'x':               /* piece x resolution */
                                if (!argv[i][2])
                                        hres = atoi(argv[i+1]);
                                break;
                        case 'y':               /* piece y resolution */
                                if (!argv[i][2])
                                        vres = atoi(argv[i+1]);
                                break;
                        case 'X':               /* horizontal multiplier */
                                if (argv[i][2])
                                        break;
                                hmult = atoi(argv[++i]);
                                continue;
                        case 'Y':               /* vertical multiplier */
                                if (argv[i][2])
                                        break;
                                vmult = atoi(argv[++i]);
                                continue;
                        case 'F':               /* syncronization file */
                                if (argv[i][2])
                                        break;
                                if ((syncfd = open(argv[++i],
                                                O_RDWR|O_CREAT, 0666)) < 0) {
                                        fprintf(stderr, "%s: cannot open\n",
                                                        argv[i]);
                                        exit(1);
                                }
                                continue;
                        case 'z':               /* z-file ist verbotten */
                                fprintf(stderr, "%s: -z option not allowed\n",
                                                argv[0]);
                                exit(1);
                        case 'o':               /* output file */
                                if (argv[i][2])
                                        break;
                                outfile = argv[++i];
                                continue;
                        }
                rpargv[rpargc++] = argv[i];
        }
        rpargv[rpargc] = NULL;
        if (outfile == NULL) {
                fprintf(stderr, "%s: missing output file\n", argv[0]);
                exit(1);
        }
        init(argc, argv);
        rpiece();
        exit(cleanup(0));
}


init(ac, av)                    /* set up output file and start rpict */
int  ac;
char  **av;
{
        extern char  VersionID[];
        char  *err;
        FILE  *fp;
        int  hr, vr;
                                        /* set up view */
        if ((err = setview(&ourview)) != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        if (syncfd != -1) {
                char  buf[32];
                buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
                sscanf(buf, "%d %d", &hmult, &vmult);
        }
        normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
                                        /* open output file */
        if ((outfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) >= 0) {
                if ((fp = fdopen(dup(outfd), "w")) == NULL)
                        goto filerr;
                printargs(ac, av, fp);          /* write header */
                fprintf(fp, "SOFTWARE= %s\n", VersionID);
                fputs(VIEWSTR, fp);
                fprintview(&ourview, fp);
                putc('\n', fp);
                if (pixaspect < .99 || pixaspect > 1.01)
                        fputaspect(pixaspect, fp);
                fputformat(COLRFMT, fp);
                putc('\n', fp);
                fprtresolu(hres*hmult, vres*vmult, fp);
        } else if ((outfd = open(outfile, O_RDWR)) >= 0) {
                if ((fp = fdopen(dup(outfd), "r+")) == NULL)
                        goto filerr;
                getheader(fp, NULL, NULL);      /* skip header */
                if (!fscnresolu(&hr, &vr, fp) ||        /* check resolution */
                                hr != hres*hmult || vr != vres*vmult) {
                        fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
                                        progname, outfile);
                        exit(1);
                }
        } else {
                fprintf(stderr, "%s: cannot open file \"%s\"\n",
                                progname, outfile);
                exit(1);
        }
        scanorig = ftell(fp);           /* record position of first scanline */
        if (fclose(fp) == -1)           /* done with stream i/o */
                goto filerr;
#if NFS
        sync();                         /* flush NFS buffers */
#endif
                                        /* start rpict process */
        if (open_process(rpd, rpargv) <= 0) {
                fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
                exit(1);
        }
        if ((fromrp = fdopen(rpd[0], "r")) == NULL ||
                        (torp = fdopen(rpd[1], "w")) == NULL) {
                fprintf(stderr, "%s: cannot open stream to %s\n",
                                progname, rpargv[0]);
                exit(1);
        }
        if ((pbuf = (COLR *)malloc(hres*vres*sizeof(COLR))) == NULL) {
                fprintf(stderr, "%s: out of memory\n", progname);
                exit(1);
        }
        signal(SIGALRM, onalrm);
        return;
filerr:
        fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
        exit(1);
}


int
nextpiece(xp, yp)               /* get next piece assignment */
int  *xp, *yp;
{
        extern char  *fgets();
        struct flock  fls;
        char  buf[64];

        if (gotalrm)                    /* someone wants us to quit */
                return(0);
        if (syncfd != -1) {             /* use sync file */
                fls.l_type = F_WRLCK;           /* gain exclusive access */
                fls.l_whence = 0;
                fls.l_start = 0L;
                fls.l_len = 0L;
                fcntl(syncfd, F_SETLKW, &fls);
                lseek(syncfd, 0L, 0);
                buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
                if (sscanf(buf, "%*d %*d %d %d", xp, yp) < 2) {
                        *xp = hmult-1;
                        *yp = vmult;
                }
                if (--(*yp) < 0) {              /* decrement position */
                        *yp = vmult-1;
                        if (--(*xp) < 0) {      /* all done! */
                                close(syncfd);
                                return(0);
                        }
                }
                sprintf(buf, "%4d %4d\n%4d %4d\n", hmult, vmult, *xp, *yp);
                lseek(syncfd, 0L, 0);           /* write new position */
                write(syncfd, buf, strlen(buf));
                fls.l_type = F_UNLCK;           /* release sync file */
                fcntl(syncfd, F_SETLKW, &fls);
                return(1);
        }
        if (fgets(buf, sizeof(buf), stdin) == NULL)     /* use stdin */
                return(0);
        if (sscanf(buf, "%d %d", xp, yp) == 2)
                return(1);
        fprintf(stderr, "%s: input format error\n", progname);
        exit(cleanup(1));
}


int
cleanup(rstat)                  /* close rpict process and clean up */
int  rstat;
{
        int  status;

        free((char *)pbuf);
        fclose(torp);
        fclose(fromrp);
        while (wait(&status) != -1)
                if (rstat == 0)
                        rstat = status>>8 & 0xff;
        return(rstat);
}


rpiece()                        /* render picture piece by piece */
{
        VIEW  pview;
        int  xorg, yorg;
                                        /* compute view parameters */
        copystruct(&pview, &ourview);
        switch (ourview.type) {
        case VT_PER:
                pview.horiz = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.vert)/vmult );
                break;
        case VT_PAR:
        case VT_ANG:
                pview.horiz = ourview.horiz / hmult;
                pview.vert = ourview.vert / vmult;
                break;
        case VT_HEM:
                pview.horiz = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.vert)/vmult );
                break;
        default:
                fprintf(stderr, "%s: unknown view type '-vt%c'\n",
                                progname, ourview.type);
                exit(cleanup(1));
        }
                                        /* render each piece */
        while (nextpiece(&xorg, &yorg)) {
                pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
                pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
                fputs(VIEWSTR, torp);
                fprintview(&pview, torp);
                putc('\n', torp);
                fflush(torp);                   /* assigns piece to rpict */
                putpiece(xorg, yorg);           /* place piece in output */
                if (verbose) {                  /* notify caller */
                        printf("%d %d done\n", xorg, yorg);
                        fflush(stdout);
                }
        }
}


int
putpiece(xpos, ypos)            /* get next piece from rpict */
int  xpos, ypos;
{
        struct flock  fls;
        int  pid, status;
        int  hr, vr;
        register int  y;
                                /* check bounds */
        if (xpos < 0 | ypos < 0 | xpos >= hmult | ypos >= vmult) {
                fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
                                progname, xpos, ypos);
                exit(cleanup(1));
        }
                                /* check header from rpict */
        guard_io();
        getheader(fromrp, NULL, NULL);
        if (!fscnresolu(&hr, &vr, fromrp) || hr != hres | vr != vres) {
                fprintf(stderr, "%s: resolution mismatch from %s\n",
                                progname, rpargv[0]);
                exit(cleanup(1));
        }
        unguard();
                                /* load new piece into buffer */
        for (y = 0; y < vr; y++) {
                guard_io();
                if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
                        fprintf(stderr, "%s: read error from %s\n",
                                        progname, rpargv[0]);
                        exit(cleanup(1));
                }
                unguard();
        }
#if MAXFORK
                                /* fork so we don't slow rpict down */
        if ((pid = fork()) > 0) {
                if (++nforked >= MAXFORK) {
                        wait(&status);          /* reap a child */
                        if (status)
                                exit(cleanup(status>>8 & 0xff));
                        nforked--;
                }
                return(pid);
        }
#else
        pid = -1;               /* no forking */
#endif
        fls.l_len = (long)vres*hmult*hres*sizeof(COLR);
        fls.l_start = scanorig + (vmult-1-ypos)*fls.l_len;
#if NFS
                                /* lock file section so NFS doesn't mess up */
        fls.l_whence = 0;
        fls.l_type = F_WRLCK;
        fcntl(outfd, F_SETLKW, &fls);
#endif
                                /* write new piece to file */
        if (lseek(outfd, fls.l_start+(long)xpos*hres*sizeof(COLR), 0) == -1)
                goto seekerr;
        if (hmult == 1) {
                if (writebuf(outfd, (char *)pbuf,
                                vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR))
                        goto writerr;
        } else
                for (y = 0; y < vr; y++) {
                        if (writebuf(outfd, (char *)(pbuf+y*hr),
                                        hr*sizeof(COLR)) != hr*sizeof(COLR))
                                goto writerr;
                        if (y < vr-1 && lseek(outfd,
                                        (long)(hmult-1)*hr*sizeof(COLR),
                                        1) == -1)
                                goto seekerr;
                }
        if (pid == -1) {        /* fork failed */
#if NFS
                fls.l_type = F_UNLCK;           /* release lock */
                fcntl(outfd, F_SETLKW, &fls);
#endif
                return(0);
        }
        _exit(0);               /* else exit child process (releasing lock) */
seekerr:
        fprintf(stderr, "%s: seek error on file \"%s\"\n", progname, outfile);
        _exit(1);
writerr:
        fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile);
        _exit(1);
}

#endif
Revision:	2.18
Committed:	Fri Apr 16 12:03:59 1993 UTC (31 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.17:	+15 -2 lines
Log Message:	added signal blocking for SYSV during freadcolrs() call
#	User	Rev	Content
1	greg	2.1	/* Copyright (c) 1992 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Generate sections of a picture.
9			*/
10
11			#include "standard.h"
12			#include <fcntl.h>
13	greg	2.16
14			#ifndef F_SETLKW
15
16			main(argc, argv)
17			int argc;
18			char *argv[];
19			{
20			fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
21			exit(1);
22			}
23
24			#else
25
26	greg	2.6	#include <signal.h>
27	greg	2.1	#include "color.h"
28			#include "view.h"
29			#include "resolu.h"
30
31	greg	2.12	#ifndef NFS
32			#define NFS 1
33			#endif
34	greg	2.9	/* set the following to 0 to forgo forking */
35			#ifndef MAXFORK
36	greg	2.12	#if NFS
37	greg	2.10	#define MAXFORK 3 /* allotment of duped processes */
38	greg	2.12	#else
39			#define MAXFORK 0
40	greg	2.9	#endif
41	greg	2.12	#endif
42	greg	2.18	/* protection from SYSV signals(!) */
43			#if defined(sgi) \|\| defined(hpux)
44			#define guard_io() sighold(SIGALRM)
45			#define unguard() sigrelse(SIGALRM)
46			#endif
47			#ifndef guard_io
48			#define guard_io() 0
49			#define unguard() 0
50			#endif
51	greg	2.1	/* rpict command */
52	greg	2.4	char *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"};
53			int rpargc = 9;
54	greg	2.1	int rpd[3];
55			FILE torp, fromrp;
56	greg	2.8	COLR *pbuf;
57	greg	2.1	/* our view parameters */
58			VIEW ourview = STDVIEW;
59	greg	2.4	double pixaspect = 1.0;
60	greg	2.1	int hres = 512, vres = 512, hmult = 2, vmult = 2;
61			/* output file */
62			char *outfile = NULL;
63			int outfd;
64			long scanorig;
65	greg	2.5	int syncfd = -1; /* lock file descriptor */
66	greg	2.9	int nforked = 0;
67	greg	2.1
68			char *progname;
69			int verbose = 0;
70
71			extern long lseek(), ftell();
72
73	greg	2.6	int gotalrm = 0;
74			int onalrm() { gotalrm++; }
75	greg	2.1
76	greg	2.6
77	greg	2.1	main(argc, argv)
78			int argc;
79			char *argv[];
80			{
81			register int i, rval;
82
83			progname = argv[0];
84			for (i = 1; i < argc; i++) {
85			if (argv[i][0] == '-')
86			switch (argv[i][1]) {
87			case 'v':
88			switch (argv[i][2]) {
89			case '\0': /* verbose option */
90			verbose = !verbose;
91			continue;
92			case 'f': /* view file */
93			if (viewfile(argv[++i], &ourview, NULL) <= 0) {
94			fprintf(stderr,
95			"%s: not a view file\n", argv[i]);
96			exit(1);
97			}
98			continue;
99			default: /* view option? */
100			rval = getviewopt(&ourview, argc-i, argv+i);
101			if (rval >= 0) {
102			i += rval;
103			continue;
104			}
105			break;
106			}
107			break;
108			case 'p': /* pixel aspect ratio? */
109			if (argv[i][2] == 'a' && !argv[i][3])
110			pixaspect = atof(argv[i+1]);
111			break;
112			case 'x': /* piece x resolution */
113			if (!argv[i][2])
114			hres = atoi(argv[i+1]);
115			break;
116			case 'y': /* piece y resolution */
117			if (!argv[i][2])
118			vres = atoi(argv[i+1]);
119			break;
120			case 'X': /* horizontal multiplier */
121			if (argv[i][2])
122			break;
123			hmult = atoi(argv[++i]);
124			continue;
125			case 'Y': /* vertical multiplier */
126			if (argv[i][2])
127			break;
128			vmult = atoi(argv[++i]);
129			continue;
130	greg	2.5	case 'F': /* syncronization file */
131			if (argv[i][2])
132			break;
133	greg	2.14	if ((syncfd = open(argv[++i],
134			O_RDWR\|O_CREAT, 0666)) < 0) {
135	greg	2.5	fprintf(stderr, "%s: cannot open\n",
136			argv[i]);
137			exit(1);
138			}
139			continue;
140	greg	2.15	case 'z': /* z-file ist verbotten */
141			fprintf(stderr, "%s: -z option not allowed\n",
142			argv[0]);
143			exit(1);
144	greg	2.1	case 'o': /* output file */
145			if (argv[i][2])
146			break;
147			outfile = argv[++i];
148			continue;
149			}
150			rpargv[rpargc++] = argv[i];
151			}
152			rpargv[rpargc] = NULL;
153			if (outfile == NULL) {
154			fprintf(stderr, "%s: missing output file\n", argv[0]);
155			exit(1);
156			}
157			init(argc, argv);
158			rpiece();
159	greg	2.15	exit(cleanup(0));
160	greg	2.1	}
161
162
163			init(ac, av) /* set up output file and start rpict */
164			int ac;
165			char **av;
166			{
167	greg	2.2	extern char VersionID[];
168	greg	2.1	char *err;
169			FILE *fp;
170			int hr, vr;
171			/* set up view */
172			if ((err = setview(&ourview)) != NULL) {
173			fprintf(stderr, "%s: %s\n", progname, err);
174			exit(1);
175			}
176	greg	2.5	if (syncfd != -1) {
177			char buf[32];
178			buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
179			sscanf(buf, "%d %d", &hmult, &vmult);
180			}
181	greg	2.1	normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
182			/* open output file */
183			if ((outfd = open(outfile, O_WRONLY\|O_CREAT\|O_EXCL, 0666)) >= 0) {
184			if ((fp = fdopen(dup(outfd), "w")) == NULL)
185			goto filerr;
186			printargs(ac, av, fp); /* write header */
187	greg	2.2	fprintf(fp, "SOFTWARE= %s\n", VersionID);
188	greg	2.1	fputs(VIEWSTR, fp);
189			fprintview(&ourview, fp);
190			putc('\n', fp);
191			if (pixaspect < .99 \|\| pixaspect > 1.01)
192			fputaspect(pixaspect, fp);
193			fputformat(COLRFMT, fp);
194			putc('\n', fp);
195			fprtresolu(hreshmult, vresvmult, fp);
196			} else if ((outfd = open(outfile, O_RDWR)) >= 0) {
197			if ((fp = fdopen(dup(outfd), "r+")) == NULL)
198			goto filerr;
199	greg	2.13	getheader(fp, NULL, NULL); /* skip header */
200	greg	2.15	if (!fscnresolu(&hr, &vr, fp) \|\| /* check resolution */
201	greg	2.1	hr != hreshmult \|\| vr != vresvmult) {
202	greg	2.8	fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
203			progname, outfile);
204	greg	2.1	exit(1);
205			}
206			} else {
207	greg	2.8	fprintf(stderr, "%s: cannot open file \"%s\"\n",
208			progname, outfile);
209	greg	2.1	exit(1);
210			}
211			scanorig = ftell(fp); /* record position of first scanline */
212			if (fclose(fp) == -1) /* done with stream i/o */
213			goto filerr;
214	greg	2.12	#if NFS
215	greg	2.8	sync(); /* flush NFS buffers */
216	greg	2.12	#endif
217	greg	2.1	/* start rpict process */
218			if (open_process(rpd, rpargv) <= 0) {
219	greg	2.3	fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
220	greg	2.1	exit(1);
221			}
222			if ((fromrp = fdopen(rpd[0], "r")) == NULL \|\|
223			(torp = fdopen(rpd[1], "w")) == NULL) {
224			fprintf(stderr, "%s: cannot open stream to %s\n",
225			progname, rpargv[0]);
226			exit(1);
227			}
228	greg	2.8	if ((pbuf = (COLR )malloc(hresvres*sizeof(COLR))) == NULL) {
229	greg	2.1	fprintf(stderr, "%s: out of memory\n", progname);
230			exit(1);
231			}
232	greg	2.6	signal(SIGALRM, onalrm);
233	greg	2.1	return;
234			filerr:
235	greg	2.8	fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
236	greg	2.1	exit(1);
237			}
238
239
240			int
241	greg	2.5	nextpiece(xp, yp) /* get next piece assignment */
242			int xp, yp;
243			{
244			extern char *fgets();
245			struct flock fls;
246			char buf[64];
247
248	greg	2.6	if (gotalrm) /* someone wants us to quit */
249			return(0);
250			if (syncfd != -1) { /* use sync file */
251	greg	2.5	fls.l_type = F_WRLCK; /* gain exclusive access */
252			fls.l_whence = 0;
253			fls.l_start = 0L;
254			fls.l_len = 0L;
255			fcntl(syncfd, F_SETLKW, &fls);
256			lseek(syncfd, 0L, 0);
257			buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
258			if (sscanf(buf, "%d %d %d %d", xp, yp) < 2) {
259	greg	2.8	*xp = hmult-1;
260			*yp = vmult;
261			}
262			if (--(yp) < 0) { / decrement position */
263	greg	2.5	*yp = vmult-1;
264	greg	2.8	if (--(xp) < 0) { / all done! */
265	greg	2.5	close(syncfd);
266			return(0);
267			}
268			}
269	greg	2.17	sprintf(buf, "%4d %4d\n%4d %4d\n", hmult, vmult, xp, yp);
270	greg	2.5	lseek(syncfd, 0L, 0); /* write new position */
271			write(syncfd, buf, strlen(buf));
272			fls.l_type = F_UNLCK; /* release sync file */
273			fcntl(syncfd, F_SETLKW, &fls);
274			return(1);
275			}
276	greg	2.6	if (fgets(buf, sizeof(buf), stdin) == NULL) /* use stdin */
277	greg	2.5	return(0);
278			if (sscanf(buf, "%d %d", xp, yp) == 2)
279			return(1);
280			fprintf(stderr, "%s: input format error\n", progname);
281	greg	2.10	exit(cleanup(1));
282	greg	2.5	}
283
284
285			int
286	greg	2.10	cleanup(rstat) /* close rpict process and clean up */
287			int rstat;
288	greg	2.1	{
289	greg	2.10	int status;
290	greg	2.1
291	greg	2.8	free((char *)pbuf);
292	greg	2.1	fclose(torp);
293			fclose(fromrp);
294	greg	2.10	while (wait(&status) != -1)
295	greg	2.9	if (rstat == 0)
296			rstat = status>>8 & 0xff;
297			return(rstat);
298	greg	2.1	}
299
300
301			rpiece() /* render picture piece by piece */
302			{
303			VIEW pview;
304			int xorg, yorg;
305	greg	2.11	/* compute view parameters */
306			copystruct(&pview, &ourview);
307			switch (ourview.type) {
308			case VT_PER:
309			pview.horiz = 2.180./PIatan(
310			tan(PI/180./2.*ourview.horiz)/hmult );
311			pview.vert = 2.180./PIatan(
312			tan(PI/180./2.*ourview.vert)/vmult );
313			break;
314			case VT_PAR:
315			case VT_ANG:
316			pview.horiz = ourview.horiz / hmult;
317			pview.vert = ourview.vert / vmult;
318			break;
319			case VT_HEM:
320			pview.horiz = 2.180./PIasin(
321			sin(PI/180./2.*ourview.horiz)/hmult );
322			pview.vert = 2.180./PIasin(
323			sin(PI/180./2.*ourview.vert)/vmult );
324			break;
325			default:
326			fprintf(stderr, "%s: unknown view type '-vt%c'\n",
327			progname, ourview.type);
328			exit(cleanup(1));
329			}
330			/* render each piece */
331	greg	2.5	while (nextpiece(&xorg, &yorg)) {
332	greg	2.11	pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
333			pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
334	greg	2.1	fputs(VIEWSTR, torp);
335			fprintview(&pview, torp);
336			putc('\n', torp);
337	greg	2.11	fflush(torp); /* assigns piece to rpict */
338	greg	2.1	putpiece(xorg, yorg); /* place piece in output */
339			if (verbose) { /* notify caller */
340	greg	2.5	printf("%d %d done\n", xorg, yorg);
341			fflush(stdout);
342	greg	2.1	}
343			}
344			}
345
346
347	greg	2.9	int
348	greg	2.1	putpiece(xpos, ypos) /* get next piece from rpict */
349			int xpos, ypos;
350			{
351	greg	2.7	struct flock fls;
352	greg	2.9	int pid, status;
353	greg	2.1	int hr, vr;
354	greg	2.8	register int y;
355			/* check bounds */
356	greg	2.5	if (xpos < 0 \| ypos < 0 \| xpos >= hmult \| ypos >= vmult) {
357			fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
358			progname, xpos, ypos);
359	greg	2.10	exit(cleanup(1));
360	greg	2.5	}
361	greg	2.8	/* check header from rpict */
362	greg	2.18	guard_io();
363	greg	2.13	getheader(fromrp, NULL, NULL);
364	greg	2.15	if (!fscnresolu(&hr, &vr, fromrp) \|\| hr != hres \| vr != vres) {
365	greg	2.3	fprintf(stderr, "%s: resolution mismatch from %s\n",
366			progname, rpargv[0]);
367	greg	2.10	exit(cleanup(1));
368	greg	2.1	}
369	greg	2.18	unguard();
370	greg	2.8	/* load new piece into buffer */
371	greg	2.18	for (y = 0; y < vr; y++) {
372			guard_io();
373	greg	2.8	if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
374	greg	2.3	fprintf(stderr, "%s: read error from %s\n",
375			progname, rpargv[0]);
376	greg	2.10	exit(cleanup(1));
377	greg	2.1	}
378	greg	2.18	unguard();
379			}
380	greg	2.9	#if MAXFORK
381			/* fork so we don't slow rpict down */
382			if ((pid = fork()) > 0) {
383	greg	2.10	if (++nforked >= MAXFORK) {
384	greg	2.9	wait(&status); /* reap a child */
385			if (status)
386	greg	2.10	exit(cleanup(status>>8 & 0xff));
387	greg	2.9	nforked--;
388			}
389			return(pid);
390			}
391			#else
392			pid = -1; /* no forking */
393			#endif
394	greg	2.15	fls.l_len = (long)vreshmulthres*sizeof(COLR);
395			fls.l_start = scanorig + (vmult-1-ypos)*fls.l_len;
396	greg	2.12	#if NFS
397	greg	2.8	/* lock file section so NFS doesn't mess up */
398			fls.l_whence = 0;
399			fls.l_type = F_WRLCK;
400			fcntl(outfd, F_SETLKW, &fls);
401	greg	2.12	#endif
402	greg	2.8	/* write new piece to file */
403			if (lseek(outfd, fls.l_start+(long)xposhressizeof(COLR), 0) == -1)
404			goto seekerr;
405	greg	2.9	if (hmult == 1) {
406			if (writebuf(outfd, (char *)pbuf,
407			vrhrsizeof(COLR)) != vrhrsizeof(COLR))
408			goto writerr;
409			} else
410			for (y = 0; y < vr; y++) {
411			if (writebuf(outfd, (char )(pbuf+yhr),
412			hrsizeof(COLR)) != hrsizeof(COLR))
413			goto writerr;
414			if (y < vr-1 && lseek(outfd,
415			(long)(hmult-1)hrsizeof(COLR),
416			1) == -1)
417			goto seekerr;
418	greg	2.1	}
419	greg	2.9	if (pid == -1) { /* fork failed */
420	greg	2.12	#if NFS
421	greg	2.9	fls.l_type = F_UNLCK; /* release lock */
422			fcntl(outfd, F_SETLKW, &fls);
423	greg	2.12	#endif
424	greg	2.9	return(0);
425	greg	2.1	}
426	greg	2.9	_exit(0); /* else exit child process (releasing lock) */
427	greg	2.8	seekerr:
428			fprintf(stderr, "%s: seek error on file \"%s\"\n", progname, outfile);
429	greg	2.9	_exit(1);
430			writerr:
431			fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile);
432			_exit(1);
433	greg	2.1	}
434	greg	2.16
435			#endif