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

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 */
                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_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:	3.19
Committed:	Wed Aug 12 17:55:11 1998 UTC (27 years, 2 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 3.18:	+14 -5 lines
Log Message:	added more careful calls to disp_check()
#	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	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	gwlarson	3.18	/* send eye separation if specified */
60			if (vdef(EYESEP)) {
61			char fbuf[32];
62			sprintf(fbuf, "%.9e", vflt(EYESEP));
63			disp_result(DS_EYESEP, strlen(fbuf)+1, fbuf);
64			}
65	gregl	3.2	/* write out hologram grids */
66			for (i = 0; hdlist[i] != NULL; i++)
67			disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
68	gregl	3.5	disp_flush();
69	gregl	3.1	}
70
71
72	gregl	3.2	disp_packet(p) /* display a packet */
73	gregl	3.4	register PACKHEAD *p;
74	gregl	3.2	{
75	gregl	3.4	disp_result(DS_BUNDLE, packsiz(p->nr), (char *)p);
76	gregl	3.2	}
77
78
79	gregl	3.1	disp_check(block) /* check display process */
80			int block;
81			{
82	gregl	3.2	MSGHEAD msg;
83			int n;
84			char *buf = NULL;
85
86	gregl	3.6	if (dpout == NULL)
87	gregl	3.2	return(-1);
88	gregl	3.5	/* flush display output */
89			disp_flush();
90	gregl	3.3	/* check read blocking */
91	gregl	3.2	if (block != (inp_flags == 0)) {
92			inp_flags = block ? 0 : FNONBLK;
93			if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
94			goto fcntlerr;
95			}
96			/* read message header */
97			n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
98			if (n != sizeof(MSGHEAD)) {
99	gregl	3.10	if (n >= 0) {
100			dpout = NULL;
101	gregl	3.2	error(USER, "display process died");
102	gregl	3.10	}
103	gregl	3.2	if (errno != EAGAIN & errno != EINTR)
104			goto readerr;
105	gregl	3.3	return(2); /* acceptable failure */
106	gregl	3.2	}
107			if (msg.nbytes) { /* get the message body */
108			buf = (char *)malloc(msg.nbytes);
109			if (buf == NULL)
110			error(SYSTEM, "out of memory in disp_check");
111	gwlarson	3.19	if (inp_flags != 0 && fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
112	gregl	3.2	goto fcntlerr;
113			if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
114			goto readerr;
115			}
116			switch (msg.type) { /* take appropriate action */
117	gregl	3.12	case DR_BUNDLE: /* new bundle to calculate */
118	gregl	3.2	if (msg.nbytes != sizeof(PACKHEAD))
119			error(INTERNAL, "bad DR_BUNDLE from display process");
120			bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
121			break;
122	gregl	3.12	case DR_NEWSET: /* new calculation set */
123	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
124			error(INTERNAL, "bad DR_NEWSET from display process");
125	gwlarson	3.19	if (msg.nbytes)
126			disp_result(DS_STARTIMM, 0, NULL);
127	gregl	3.2	bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
128	gwlarson	3.19	if (msg.nbytes) {
129			disp_result(DS_ENDIMM, 0, NULL);
130			disp_flush();
131			}
132	gregl	3.2	break;
133	gregl	3.12	case DR_ADDSET: /* add to calculation set */
134	gwlarson	3.19	if (!msg.nbytes)
135			break;
136	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
137			error(INTERNAL, "bad DR_ADDSET from display process");
138			disp_result(DS_STARTIMM, 0, NULL);
139			bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
140			disp_result(DS_ENDIMM, 0, NULL);
141	gregl	3.15	disp_flush();
142	gregl	3.2	break;
143	gregl	3.12	case DR_ADJSET: /* adjust calculation set members */
144	gwlarson	3.19	if (!msg.nbytes)
145			break;
146	gregl	3.9	if (msg.nbytes % sizeof(PACKHEAD))
147			error(INTERNAL, "bad DR_ADJSET from display process");
148			disp_result(DS_STARTIMM, 0, NULL);
149			bundle_set(BS_ADJ, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
150			disp_result(DS_ENDIMM, 0, NULL);
151			disp_flush();
152			break;
153	gregl	3.12	case DR_DELSET: /* delete from calculation set */
154	gwlarson	3.19	if (!msg.nbytes)
155			break;
156	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
157			error(INTERNAL, "bad DR_DELSET from display process");
158			bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
159			break;
160	gregl	3.12	case DR_ATTEN: /* block for priority request */
161	gregl	3.2	if (msg.nbytes)
162			error(INTERNAL, "bad DR_ATTEN from display process");
163			/* send acknowledgement */
164			disp_result(DS_ACKNOW, 0, NULL);
165	gregl	3.3	return(disp_check(1)); /* block on following request */
166	gregl	3.13	case DR_KILL: /* kill computation process(es) */
167			if (msg.nbytes)
168			error(INTERNAL, "bad DR_KILL from display process");
169	gregl	3.14	if (nprocs > 0)
170			done_rtrace();
171			else
172	gregl	3.13	error(WARNING, "no rtrace process to kill");
173			break;
174			case DR_RESTART: /* restart computation process(es) */
175			if (msg.nbytes)
176			error(INTERNAL, "bad DR_RESTART from display process");
177	gregl	3.14	if (ncprocs > nprocs)
178			new_rtrace();
179			else if (nprocs > 0)
180	gregl	3.13	error(WARNING, "rtrace already runnning");
181			else
182			error(WARNING, "holodeck not open for writing");
183			break;
184			case DR_CLOBBER: /* clobber holodeck */
185			if (msg.nbytes)
186			error(INTERNAL, "bad DR_CLOBBER from display process");
187			if (!force \|\| !ncprocs)
188			error(WARNING, "request to clobber holodeck denied");
189			else {
190			error(WARNING, "clobbering holodeck contents");
191			hdclobber(NULL);
192			}
193			break;
194	gregl	3.12	case DR_SHUTDOWN: /* shut down program */
195	gregl	3.2	if (msg.nbytes)
196			error(INTERNAL, "bad DR_SHUTDOWN from display process");
197			return(0); /* zero return signals shutdown */
198	gregl	3.12	case DR_NOOP: /* do nothing */
199	gregl	3.7	break;
200	gregl	3.2	default:
201			error(INTERNAL, "unrecognized request from display process");
202			}
203	gregl	3.3	if (msg.nbytes) /* clean up */
204	gregl	3.2	free(buf);
205			return(1); /* normal return value */
206			fcntlerr:
207			error(SYSTEM, "cannot change display blocking mode");
208			readerr:
209			error(SYSTEM, "error reading from display process");
210	gregl	3.1	}
211
212
213	gregl	3.2	int
214			disp_close() /* close our display process */
215	gregl	3.1	{
216	gregl	3.2	int rval;
217
218	gregl	3.6	if (dpout == NULL)
219	gregl	3.2	return(-1);
220			disp_result(DS_SHUTDOWN, 0, NULL);
221	gregl	3.5	fclose(dpout);
222			dpout = NULL;
223	gregl	3.2	return(close_process(dpd));
224			}
225
226
227	gregl	3.5	disp_result(type, nbytes, p) /* queue result message to display process */
228	gregl	3.2	int type, nbytes;
229			char *p;
230			{
231			MSGHEAD msg;
232
233	gregl	3.6	if (dpout == NULL)
234			return;
235	gregl	3.2	msg.type = type;
236			msg.nbytes = nbytes;
237	gregl	3.5	fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);
238			if (nbytes > 0)
239			fwrite(p, 1, nbytes, dpout);
240			}
241
242
243			disp_flush() /* flush output to display */
244			{
245			if (fflush(dpout) < 0)
246			error(SYSTEM, "error writing to the display process");
247	gregl	3.1	}