src/hd/rholo4.c

/* Copyright (c) 1997 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

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);
                                /* 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 */
                buf = (char *)malloc(msg.nbytes);
                if (buf == NULL)
                        error(SYSTEM, "out of memory in disp_check");
                if (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");
                disp_result(DS_STARTIMM, 0, NULL);
                bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
                disp_result(DS_ENDIMM, 0, NULL);
                disp_flush();
                break;
        case DR_ADDSET:         /* add to calculation set */
                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 % 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 % sizeof(PACKHEAD))
                        error(INTERNAL, "bad DR_DELSET from display process");
                bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
                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;

        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:	3.17
Committed:	Sun Jan 4 18:37:11 1998 UTC (26 years, 3 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 3.16:	+3 -0 lines
Log Message:	added motion outside section when OBSTRUCTIONS=True
#	User	Rev	Content
1	gregl	3.1	/* Copyright (c) 1997 Silicon Graphics, Inc. */
2
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	gregl	3.2	static int inp_flags;
20			static int dpd[3];
21	gregl	3.5	static FILE *dpout;
22	gregl	3.2
23
24			disp_open(dname) /* open the named display driver */
25	gregl	3.1	char *dname;
26			{
27	gregl	3.11	char dpath[128], fd0[8], fd1[8], *cmd[5];
28	gregl	3.2	int i;
29	gregl	3.11	/* get full display program name */
30	gregl	3.2	#ifdef DEVPATH
31			sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
32			#else
33			sprintf(dpath, "dev/%s%s", dname, HDSUF);
34			#endif
35	gregl	3.11	/* dup stdin and stdout */
36			if (readinp)
37			sprintf(fd0, "%d", dup(0));
38			else
39			strcpy(fd0, "-1");
40			sprintf(fd1, "%d", dup(1));
41			/* start the display process */
42			cmd[0] = dpath;
43			cmd[1] = froot; cmd[2] = fd1; cmd[3] = fd0;
44			cmd[4] = NULL;
45			i = open_process(dpd, cmd);
46	gregl	3.6	if (i <= 0)
47	gregl	3.2	error(USER, "cannot start display process");
48	gregl	3.11	if ((dpout = fdopen(dpd[1], "w")) == NULL)
49	gregl	3.5	error(SYSTEM, "cannot associate FILE with display pipe");
50	gregl	3.11	dpd[1] = -1; /* causes ignored error in close_process() */
51	gregl	3.2	inp_flags = 0;
52	gregl	3.11	/* close dup'ed stdin and stdout */
53			if (readinp)
54			close(atoi(fd0));
55			close(atoi(fd1));
56	gregl	3.17	/* check if outside */
57			if (vdef(OBSTRUCTIONS) && vbool(OBSTRUCTIONS))
58			disp_result(DS_OUTSECT, 0, NULL);
59	gregl	3.2	/* write out hologram grids */
60			for (i = 0; hdlist[i] != NULL; i++)
61			disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
62	gregl	3.5	disp_flush();
63	gregl	3.1	}
64
65
66	gregl	3.2	disp_packet(p) /* display a packet */
67	gregl	3.4	register PACKHEAD *p;
68	gregl	3.2	{
69	gregl	3.4	disp_result(DS_BUNDLE, packsiz(p->nr), (char *)p);
70	gregl	3.2	}
71
72
73	gregl	3.1	disp_check(block) /* check display process */
74			int block;
75			{
76	gregl	3.2	MSGHEAD msg;
77			int n;
78			char *buf = NULL;
79
80	gregl	3.6	if (dpout == NULL)
81	gregl	3.2	return(-1);
82	gregl	3.5	/* flush display output */
83			disp_flush();
84	gregl	3.3	/* check read blocking */
85	gregl	3.2	if (block != (inp_flags == 0)) {
86			inp_flags = block ? 0 : FNONBLK;
87			if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
88			goto fcntlerr;
89			}
90			/* read message header */
91			n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
92			if (n != sizeof(MSGHEAD)) {
93	gregl	3.10	if (n >= 0) {
94			dpout = NULL;
95	gregl	3.2	error(USER, "display process died");
96	gregl	3.10	}
97	gregl	3.2	if (errno != EAGAIN & errno != EINTR)
98			goto readerr;
99	gregl	3.3	return(2); /* acceptable failure */
100	gregl	3.2	}
101			if (msg.nbytes) { /* get the message body */
102			buf = (char *)malloc(msg.nbytes);
103			if (buf == NULL)
104			error(SYSTEM, "out of memory in disp_check");
105			if (fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
106			goto fcntlerr;
107			if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
108			goto readerr;
109			}
110			switch (msg.type) { /* take appropriate action */
111	gregl	3.12	case DR_BUNDLE: /* new bundle to calculate */
112	gregl	3.2	if (msg.nbytes != sizeof(PACKHEAD))
113			error(INTERNAL, "bad DR_BUNDLE from display process");
114			bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
115			break;
116	gregl	3.12	case DR_NEWSET: /* new calculation set */
117	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
118			error(INTERNAL, "bad DR_NEWSET from display process");
119			disp_result(DS_STARTIMM, 0, NULL);
120			bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
121			disp_result(DS_ENDIMM, 0, NULL);
122	gregl	3.5	disp_flush();
123	gregl	3.2	break;
124	gregl	3.12	case DR_ADDSET: /* add to calculation set */
125	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
126			error(INTERNAL, "bad DR_ADDSET from display process");
127			disp_result(DS_STARTIMM, 0, NULL);
128			bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
129			disp_result(DS_ENDIMM, 0, NULL);
130	gregl	3.15	disp_flush();
131	gregl	3.2	break;
132	gregl	3.12	case DR_ADJSET: /* adjust calculation set members */
133	gregl	3.9	if (msg.nbytes % sizeof(PACKHEAD))
134			error(INTERNAL, "bad DR_ADJSET from display process");
135			disp_result(DS_STARTIMM, 0, NULL);
136			bundle_set(BS_ADJ, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
137			disp_result(DS_ENDIMM, 0, NULL);
138			disp_flush();
139			break;
140	gregl	3.12	case DR_DELSET: /* delete from calculation set */
141	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
142			error(INTERNAL, "bad DR_DELSET from display process");
143			bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
144			break;
145	gregl	3.12	case DR_ATTEN: /* block for priority request */
146	gregl	3.2	if (msg.nbytes)
147			error(INTERNAL, "bad DR_ATTEN from display process");
148			/* send acknowledgement */
149			disp_result(DS_ACKNOW, 0, NULL);
150	gregl	3.3	return(disp_check(1)); /* block on following request */
151	gregl	3.13	case DR_KILL: /* kill computation process(es) */
152			if (msg.nbytes)
153			error(INTERNAL, "bad DR_KILL from display process");
154	gregl	3.14	if (nprocs > 0)
155			done_rtrace();
156			else
157	gregl	3.13	error(WARNING, "no rtrace process to kill");
158			break;
159			case DR_RESTART: /* restart computation process(es) */
160			if (msg.nbytes)
161			error(INTERNAL, "bad DR_RESTART from display process");
162	gregl	3.14	if (ncprocs > nprocs)
163			new_rtrace();
164			else if (nprocs > 0)
165	gregl	3.13	error(WARNING, "rtrace already runnning");
166			else
167			error(WARNING, "holodeck not open for writing");
168			break;
169			case DR_CLOBBER: /* clobber holodeck */
170			if (msg.nbytes)
171			error(INTERNAL, "bad DR_CLOBBER from display process");
172			if (!force \|\| !ncprocs)
173			error(WARNING, "request to clobber holodeck denied");
174			else {
175			error(WARNING, "clobbering holodeck contents");
176			hdclobber(NULL);
177			}
178			break;
179	gregl	3.12	case DR_SHUTDOWN: /* shut down program */
180	gregl	3.2	if (msg.nbytes)
181			error(INTERNAL, "bad DR_SHUTDOWN from display process");
182			return(0); /* zero return signals shutdown */
183	gregl	3.12	case DR_NOOP: /* do nothing */
184	gregl	3.7	break;
185	gregl	3.2	default:
186			error(INTERNAL, "unrecognized request from display process");
187			}
188	gregl	3.3	if (msg.nbytes) /* clean up */
189	gregl	3.2	free(buf);
190			return(1); /* normal return value */
191			fcntlerr:
192			error(SYSTEM, "cannot change display blocking mode");
193			readerr:
194			error(SYSTEM, "error reading from display process");
195	gregl	3.1	}
196
197
198	gregl	3.2	int
199			disp_close() /* close our display process */
200	gregl	3.1	{
201	gregl	3.2	int rval;
202
203	gregl	3.6	if (dpout == NULL)
204	gregl	3.2	return(-1);
205			disp_result(DS_SHUTDOWN, 0, NULL);
206	gregl	3.5	fclose(dpout);
207			dpout = NULL;
208	gregl	3.2	return(close_process(dpd));
209			}
210
211
212	gregl	3.5	disp_result(type, nbytes, p) /* queue result message to display process */
213	gregl	3.2	int type, nbytes;
214			char *p;
215			{
216			MSGHEAD msg;
217
218	gregl	3.6	if (dpout == NULL)
219			return;
220	gregl	3.2	msg.type = type;
221			msg.nbytes = nbytes;
222	gregl	3.5	fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);
223			if (nbytes > 0)
224			fwrite(p, 1, nbytes, dpout);
225			}
226
227
228			disp_flush() /* flush output to display */
229			{
230			if (fflush(dpout) < 0)
231			error(SYSTEM, "error writing to the display process");
232	gregl	3.1	}