src/hd/rholo4.c

/* Copyright (c) 1998 Silicon Graphics, Inc. */

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

/*
 * Holodeck display process communication
 */

#include "rholo.h"
#include "rhdisp.h"
#include <sys/uio.h>

#ifndef HDSUF
#define HDSUF   ".hdi"
#endif

#ifndef FNONBLK
#define FNONBLK         O_NONBLOCK
#endif

static int      inp_flags;
static int      dpd[3];
static FILE     *dpout;


disp_open(dname)                /* open the named display driver */
char    *dname;
{
        char    dpath[128], fd0[8], fd1[8], *cmd[5];
        int     i;
                                /* get full display program name */
#ifdef DEVPATH
        sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
#else
        sprintf(dpath, "dev/%s%s", dname, HDSUF);
#endif
                                /* dup stdin and stdout */
        if (readinp)
                sprintf(fd0, "%d", dup(0));
        else
                strcpy(fd0, "-1");
        sprintf(fd1, "%d", dup(1));
                                /* start the display process */
        cmd[0] = dpath;
        cmd[1] = froot; cmd[2] = fd1; cmd[3] = fd0;
        cmd[4] = NULL;
        i = open_process(dpd, cmd);
        if (i <= 0)
                error(USER, "cannot start display process");
        if ((dpout = fdopen(dpd[1], "w")) == NULL)
                error(SYSTEM, "cannot associate FILE with display pipe");
        dpd[1] = -1;            /* causes ignored error in close_process() */
        inp_flags = 0;
                                /* close dup'ed stdin and stdout */
        if (readinp)
                close(atoi(fd0));
        close(atoi(fd1));
                                /* check if outside */
        if (vdef(OBSTRUCTIONS) && vbool(OBSTRUCTIONS))
                disp_result(DS_OUTSECT, 0, NULL);
                                /* send eye separation if specified */
        if (vdef(EYESEP)) {
                char    fbuf[32];
                sprintf(fbuf, "%.9e", vflt(EYESEP));
                disp_result(DS_EYESEP, strlen(fbuf)+1, fbuf);
        }
                                /* write out hologram grids */
        for (i = 0; hdlist[i] != NULL; i++)
                disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
        disp_flush();
}


disp_packet(p)                  /* display a packet */
register PACKHEAD       *p;
{
        disp_result(DS_BUNDLE, packsiz(p->nr), (char *)p);
}


disp_check(block)               /* check display process */
int     block;
{
        MSGHEAD msg;
        int     n;
        char    *buf = NULL;

        if (dpout == NULL)
                return(-1);
                                        /* flush display output */
        disp_flush();
                                        /* check read blocking */
        if (block != (inp_flags == 0)) {
                inp_flags = block ? 0 : FNONBLK;
                if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
                        goto fcntlerr;
        }
                                        /* read message header */
        n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
        if (n != sizeof(MSGHEAD)) {
                if (n >= 0) {
                        dpout = NULL;
                        error(USER, "display process died");
                }
                if (errno != EAGAIN & errno != EINTR)
                        goto readerr;
                return(2);              /* acceptable failure */
        }
        if (msg.nbytes) {               /* get the message body */
                if (msg.nbytes < 0)
                        error(INTERNAL, "anti-message from display process");
                buf = (char *)malloc(msg.nbytes);
                if (buf == NULL)
                        error(SYSTEM, "out of memory in disp_check");
                if (inp_flags != 0 && fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
                        goto fcntlerr;
                if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
                        goto readerr;
        }
        switch (msg.type) {             /* take appropriate action */
        case DR_BUNDLE:         /* new bundle to calculate */
                if (msg.nbytes != sizeof(PACKHEAD))
                        error(INTERNAL, "bad DR_BUNDLE from display process");
                bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
                break;
        case DR_NEWSET:         /* new calculation set */
                if (msg.nbytes % sizeof(PACKHEAD))
                        error(INTERNAL, "bad DR_NEWSET from display process");
                if (msg.nbytes)
                        disp_result(DS_STARTIMM, 0, NULL);
                bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
                if (msg.nbytes) {
                        disp_result(DS_ENDIMM, 0, NULL);
                        disp_flush();
                }
                break;
        case DR_ADDSET:         /* add to calculation set */
                if (!msg.nbytes)
                        break;
                if (msg.nbytes % sizeof(PACKHEAD))
                        error(INTERNAL, "bad DR_ADDSET from display process");
                disp_result(DS_STARTIMM, 0, NULL);
                bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
                disp_result(DS_ENDIMM, 0, NULL);
                disp_flush();
                break;
        case DR_ADJSET:         /* adjust calculation set members */
                if (!msg.nbytes)
                        break;
                if (msg.nbytes % sizeof(PACKHEAD))
                        error(INTERNAL, "bad DR_ADJSET from display process");
                disp_result(DS_STARTIMM, 0, NULL);
                bundle_set(BS_ADJ, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
                disp_result(DS_ENDIMM, 0, NULL);
                disp_flush();
                break;
        case DR_DELSET:         /* delete from calculation set */
                if (!msg.nbytes)
                        break;
                if (msg.nbytes % sizeof(PACKHEAD))
                        error(INTERNAL, "bad DR_DELSET from display process");
                bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
                break;
        case DR_VIEWPOINT:      /* set target eye position */
                if (msg.nbytes != sizeof(VIEWPOINT))
                        error(INTERNAL, "bad DR_VIEWPOINT from display process");
                copystruct(&myeye, (VIEWPOINT *)buf);
                break;
        case DR_ATTEN:          /* block for priority request */
                if (msg.nbytes)
                        error(INTERNAL, "bad DR_ATTEN from display process");
                                        /* send acknowledgement */
                disp_result(DS_ACKNOW, 0, NULL);
                return(disp_check(1));  /* block on following request */
        case DR_KILL:           /* kill computation process(es) */
                if (msg.nbytes)
                        error(INTERNAL, "bad DR_KILL from display process");
                if (nprocs > 0)
                        done_rtrace();
                else
                        error(WARNING, "no rtrace process to kill");
                break;
        case DR_RESTART:        /* restart computation process(es) */
                if (msg.nbytes)
                        error(INTERNAL, "bad DR_RESTART from display process");
                if (ncprocs > nprocs)
                        new_rtrace();
                else if (nprocs > 0)
                        error(WARNING, "rtrace already runnning");
                else
                        error(WARNING, "holodeck not open for writing");
                break;
        case DR_CLOBBER:        /* clobber holodeck */
                if (msg.nbytes)
                        error(INTERNAL, "bad DR_CLOBBER from display process");
                if (!force || !ncprocs)
                        error(WARNING, "request to clobber holodeck denied");
                else {
                        error(WARNING, "clobbering holodeck contents");
                        hdclobber(NULL);
                }
                break;
        case DR_SHUTDOWN:       /* shut down program */
                if (msg.nbytes)
                        error(INTERNAL, "bad DR_SHUTDOWN from display process");
                return(0);              /* zero return signals shutdown */
        case DR_NOOP:           /* do nothing */
                break;
        default:
                error(INTERNAL, "unrecognized request from display process");
        }
        if (msg.nbytes)                 /* clean up */
                free(buf);
        return(1);                      /* normal return value */
fcntlerr:
        error(SYSTEM, "cannot change display blocking mode");
readerr:
        error(SYSTEM, "error reading from display process");
}


int
disp_close()                    /* close our display process */
{
        int     rval;

        if (dpout == NULL)
                return(-1);
        disp_result(DS_SHUTDOWN, 0, NULL);
        fclose(dpout);
        dpout = NULL;
        return(close_process(dpd));
}


disp_result(type, nbytes, p)    /* queue result message to display process */
int     type, nbytes;
char    *p;
{
        MSGHEAD msg;
                                        /* consistency checks */
#ifdef DEBUG
        if (nbytes < 0 || nbytes > 0 & p == NULL)
                error(CONSISTENCY, "bad buffer handed to disp_result");
#endif
        if (dpout == NULL)
                return;
        msg.type = type;
        msg.nbytes = nbytes;
        fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);
        if (nbytes > 0)
                fwrite(p, 1, nbytes, dpout);
}


disp_flush()                    /* flush output to display */
{
        if (fflush(dpout) < 0)
                error(SYSTEM, "error writing to the display process");
}
Revision:	3.22
Committed:	Tue Nov 24 17:05:36 1998 UTC (25 years, 5 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 3.21:	+5 -0 lines
Log Message:	added eyepoint vicinity restriction for interactive samples
#	User	Rev	Content
1	gwlarson	3.19	/* Copyright (c) 1998 Silicon Graphics, Inc. */
2	gregl	3.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ SGI";
5			#endif
6
7			/*
8			* Holodeck display process communication
9			*/
10
11			#include "rholo.h"
12			#include "rhdisp.h"
13	gregl	3.2	#include <sys/uio.h>
14	gregl	3.1
15	gregl	3.2	#ifndef HDSUF
16	gregl	3.16	#define HDSUF ".hdi"
17	gregl	3.2	#endif
18	gregl	3.1
19	gwlarson	3.21	#ifndef FNONBLK
20			#define FNONBLK O_NONBLOCK
21			#endif
22
23	gregl	3.2	static int inp_flags;
24			static int dpd[3];
25	gregl	3.5	static FILE *dpout;
26	gregl	3.2
27
28			disp_open(dname) /* open the named display driver */
29	gregl	3.1	char *dname;
30			{
31	gregl	3.11	char dpath[128], fd0[8], fd1[8], *cmd[5];
32	gregl	3.2	int i;
33	gregl	3.11	/* get full display program name */
34	gregl	3.2	#ifdef DEVPATH
35			sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
36			#else
37			sprintf(dpath, "dev/%s%s", dname, HDSUF);
38			#endif
39	gregl	3.11	/* dup stdin and stdout */
40			if (readinp)
41			sprintf(fd0, "%d", dup(0));
42			else
43			strcpy(fd0, "-1");
44			sprintf(fd1, "%d", dup(1));
45			/* start the display process */
46			cmd[0] = dpath;
47			cmd[1] = froot; cmd[2] = fd1; cmd[3] = fd0;
48			cmd[4] = NULL;
49			i = open_process(dpd, cmd);
50	gregl	3.6	if (i <= 0)
51	gregl	3.2	error(USER, "cannot start display process");
52	gregl	3.11	if ((dpout = fdopen(dpd[1], "w")) == NULL)
53	gregl	3.5	error(SYSTEM, "cannot associate FILE with display pipe");
54	gregl	3.11	dpd[1] = -1; /* causes ignored error in close_process() */
55	gregl	3.2	inp_flags = 0;
56	gregl	3.11	/* close dup'ed stdin and stdout */
57			if (readinp)
58			close(atoi(fd0));
59			close(atoi(fd1));
60	gregl	3.17	/* check if outside */
61			if (vdef(OBSTRUCTIONS) && vbool(OBSTRUCTIONS))
62			disp_result(DS_OUTSECT, 0, NULL);
63	gwlarson	3.18	/* send eye separation if specified */
64			if (vdef(EYESEP)) {
65			char fbuf[32];
66			sprintf(fbuf, "%.9e", vflt(EYESEP));
67			disp_result(DS_EYESEP, strlen(fbuf)+1, fbuf);
68			}
69	gregl	3.2	/* write out hologram grids */
70			for (i = 0; hdlist[i] != NULL; i++)
71			disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
72	gregl	3.5	disp_flush();
73	gregl	3.1	}
74
75
76	gregl	3.2	disp_packet(p) /* display a packet */
77	gregl	3.4	register PACKHEAD *p;
78	gregl	3.2	{
79	gregl	3.4	disp_result(DS_BUNDLE, packsiz(p->nr), (char *)p);
80	gregl	3.2	}
81
82
83	gregl	3.1	disp_check(block) /* check display process */
84			int block;
85			{
86	gregl	3.2	MSGHEAD msg;
87			int n;
88			char *buf = NULL;
89
90	gregl	3.6	if (dpout == NULL)
91	gregl	3.2	return(-1);
92	gregl	3.5	/* flush display output */
93			disp_flush();
94	gregl	3.3	/* check read blocking */
95	gregl	3.2	if (block != (inp_flags == 0)) {
96			inp_flags = block ? 0 : FNONBLK;
97			if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
98			goto fcntlerr;
99			}
100			/* read message header */
101			n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
102			if (n != sizeof(MSGHEAD)) {
103	gregl	3.10	if (n >= 0) {
104			dpout = NULL;
105	gregl	3.2	error(USER, "display process died");
106	gregl	3.10	}
107	gregl	3.2	if (errno != EAGAIN & errno != EINTR)
108			goto readerr;
109	gregl	3.3	return(2); /* acceptable failure */
110	gregl	3.2	}
111			if (msg.nbytes) { /* get the message body */
112	gwlarson	3.20	if (msg.nbytes < 0)
113			error(INTERNAL, "anti-message from display process");
114	gregl	3.2	buf = (char *)malloc(msg.nbytes);
115			if (buf == NULL)
116			error(SYSTEM, "out of memory in disp_check");
117	gwlarson	3.19	if (inp_flags != 0 && fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
118	gregl	3.2	goto fcntlerr;
119			if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
120			goto readerr;
121			}
122			switch (msg.type) { /* take appropriate action */
123	gregl	3.12	case DR_BUNDLE: /* new bundle to calculate */
124	gregl	3.2	if (msg.nbytes != sizeof(PACKHEAD))
125			error(INTERNAL, "bad DR_BUNDLE from display process");
126			bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
127			break;
128	gregl	3.12	case DR_NEWSET: /* new calculation set */
129	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
130			error(INTERNAL, "bad DR_NEWSET from display process");
131	gwlarson	3.19	if (msg.nbytes)
132			disp_result(DS_STARTIMM, 0, NULL);
133	gregl	3.2	bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
134	gwlarson	3.19	if (msg.nbytes) {
135			disp_result(DS_ENDIMM, 0, NULL);
136			disp_flush();
137			}
138	gregl	3.2	break;
139	gregl	3.12	case DR_ADDSET: /* add to calculation set */
140	gwlarson	3.19	if (!msg.nbytes)
141			break;
142	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
143			error(INTERNAL, "bad DR_ADDSET from display process");
144			disp_result(DS_STARTIMM, 0, NULL);
145			bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
146			disp_result(DS_ENDIMM, 0, NULL);
147	gregl	3.15	disp_flush();
148	gregl	3.2	break;
149	gregl	3.12	case DR_ADJSET: /* adjust calculation set members */
150	gwlarson	3.19	if (!msg.nbytes)
151			break;
152	gregl	3.9	if (msg.nbytes % sizeof(PACKHEAD))
153			error(INTERNAL, "bad DR_ADJSET from display process");
154			disp_result(DS_STARTIMM, 0, NULL);
155			bundle_set(BS_ADJ, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
156			disp_result(DS_ENDIMM, 0, NULL);
157			disp_flush();
158			break;
159	gregl	3.12	case DR_DELSET: /* delete from calculation set */
160	gwlarson	3.19	if (!msg.nbytes)
161			break;
162	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
163			error(INTERNAL, "bad DR_DELSET from display process");
164			bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
165			break;
166	gwlarson	3.22	case DR_VIEWPOINT: /* set target eye position */
167			if (msg.nbytes != sizeof(VIEWPOINT))
168			error(INTERNAL, "bad DR_VIEWPOINT from display process");
169			copystruct(&myeye, (VIEWPOINT *)buf);
170			break;
171	gregl	3.12	case DR_ATTEN: /* block for priority request */
172	gregl	3.2	if (msg.nbytes)
173			error(INTERNAL, "bad DR_ATTEN from display process");
174			/* send acknowledgement */
175			disp_result(DS_ACKNOW, 0, NULL);
176	gregl	3.3	return(disp_check(1)); /* block on following request */
177	gregl	3.13	case DR_KILL: /* kill computation process(es) */
178			if (msg.nbytes)
179			error(INTERNAL, "bad DR_KILL from display process");
180	gregl	3.14	if (nprocs > 0)
181			done_rtrace();
182			else
183	gregl	3.13	error(WARNING, "no rtrace process to kill");
184			break;
185			case DR_RESTART: /* restart computation process(es) */
186			if (msg.nbytes)
187			error(INTERNAL, "bad DR_RESTART from display process");
188	gregl	3.14	if (ncprocs > nprocs)
189			new_rtrace();
190			else if (nprocs > 0)
191	gregl	3.13	error(WARNING, "rtrace already runnning");
192			else
193			error(WARNING, "holodeck not open for writing");
194			break;
195			case DR_CLOBBER: /* clobber holodeck */
196			if (msg.nbytes)
197			error(INTERNAL, "bad DR_CLOBBER from display process");
198			if (!force \|\| !ncprocs)
199			error(WARNING, "request to clobber holodeck denied");
200			else {
201			error(WARNING, "clobbering holodeck contents");
202			hdclobber(NULL);
203			}
204			break;
205	gregl	3.12	case DR_SHUTDOWN: /* shut down program */
206	gregl	3.2	if (msg.nbytes)
207			error(INTERNAL, "bad DR_SHUTDOWN from display process");
208			return(0); /* zero return signals shutdown */
209	gregl	3.12	case DR_NOOP: /* do nothing */
210	gregl	3.7	break;
211	gregl	3.2	default:
212			error(INTERNAL, "unrecognized request from display process");
213			}
214	gregl	3.3	if (msg.nbytes) /* clean up */
215	gregl	3.2	free(buf);
216			return(1); /* normal return value */
217			fcntlerr:
218			error(SYSTEM, "cannot change display blocking mode");
219			readerr:
220			error(SYSTEM, "error reading from display process");
221	gregl	3.1	}
222
223
224	gregl	3.2	int
225			disp_close() /* close our display process */
226	gregl	3.1	{
227	gregl	3.2	int rval;
228
229	gregl	3.6	if (dpout == NULL)
230	gregl	3.2	return(-1);
231			disp_result(DS_SHUTDOWN, 0, NULL);
232	gregl	3.5	fclose(dpout);
233			dpout = NULL;
234	gregl	3.2	return(close_process(dpd));
235			}
236
237
238	gregl	3.5	disp_result(type, nbytes, p) /* queue result message to display process */
239	gregl	3.2	int type, nbytes;
240			char *p;
241			{
242			MSGHEAD msg;
243	gwlarson	3.20	/* consistency checks */
244			#ifdef DEBUG
245			if (nbytes < 0 \|\| nbytes > 0 & p == NULL)
246			error(CONSISTENCY, "bad buffer handed to disp_result");
247			#endif
248	gregl	3.6	if (dpout == NULL)
249			return;
250	gregl	3.2	msg.type = type;
251			msg.nbytes = nbytes;
252	gregl	3.5	fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);
253			if (nbytes > 0)
254			fwrite(p, 1, nbytes, dpout);
255			}
256
257
258			disp_flush() /* flush output to display */
259			{
260			if (fflush(dpout) < 0)
261			error(SYSTEM, "error writing to the display process");
262	gregl	3.1	}