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));
                                /* 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:	3.16
Committed:	Mon Dec 22 17:42:03 1997 UTC (27 years, 10 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 3.15:	+1 -1 lines
Log Message:	change driver suffix
#	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	3.2	/* write out hologram grids */
57			for (i = 0; hdlist[i] != NULL; i++)
58			disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
59	gregl	3.5	disp_flush();
60	gregl	3.1	}
61
62
63	gregl	3.2	disp_packet(p) /* display a packet */
64	gregl	3.4	register PACKHEAD *p;
65	gregl	3.2	{
66	gregl	3.4	disp_result(DS_BUNDLE, packsiz(p->nr), (char *)p);
67	gregl	3.2	}
68
69
70	gregl	3.1	disp_check(block) /* check display process */
71			int block;
72			{
73	gregl	3.2	MSGHEAD msg;
74			int n;
75			char *buf = NULL;
76
77	gregl	3.6	if (dpout == NULL)
78	gregl	3.2	return(-1);
79	gregl	3.5	/* flush display output */
80			disp_flush();
81	gregl	3.3	/* check read blocking */
82	gregl	3.2	if (block != (inp_flags == 0)) {
83			inp_flags = block ? 0 : FNONBLK;
84			if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
85			goto fcntlerr;
86			}
87			/* read message header */
88			n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
89			if (n != sizeof(MSGHEAD)) {
90	gregl	3.10	if (n >= 0) {
91			dpout = NULL;
92	gregl	3.2	error(USER, "display process died");
93	gregl	3.10	}
94	gregl	3.2	if (errno != EAGAIN & errno != EINTR)
95			goto readerr;
96	gregl	3.3	return(2); /* acceptable failure */
97	gregl	3.2	}
98			if (msg.nbytes) { /* get the message body */
99			buf = (char *)malloc(msg.nbytes);
100			if (buf == NULL)
101			error(SYSTEM, "out of memory in disp_check");
102			if (fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
103			goto fcntlerr;
104			if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
105			goto readerr;
106			}
107			switch (msg.type) { /* take appropriate action */
108	gregl	3.12	case DR_BUNDLE: /* new bundle to calculate */
109	gregl	3.2	if (msg.nbytes != sizeof(PACKHEAD))
110			error(INTERNAL, "bad DR_BUNDLE from display process");
111			bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
112			break;
113	gregl	3.12	case DR_NEWSET: /* new calculation set */
114	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
115			error(INTERNAL, "bad DR_NEWSET from display process");
116			disp_result(DS_STARTIMM, 0, NULL);
117			bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
118			disp_result(DS_ENDIMM, 0, NULL);
119	gregl	3.5	disp_flush();
120	gregl	3.2	break;
121	gregl	3.12	case DR_ADDSET: /* add to calculation set */
122	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
123			error(INTERNAL, "bad DR_ADDSET from display process");
124			disp_result(DS_STARTIMM, 0, NULL);
125			bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
126			disp_result(DS_ENDIMM, 0, NULL);
127	gregl	3.15	disp_flush();
128	gregl	3.2	break;
129	gregl	3.12	case DR_ADJSET: /* adjust calculation set members */
130	gregl	3.9	if (msg.nbytes % sizeof(PACKHEAD))
131			error(INTERNAL, "bad DR_ADJSET from display process");
132			disp_result(DS_STARTIMM, 0, NULL);
133			bundle_set(BS_ADJ, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
134			disp_result(DS_ENDIMM, 0, NULL);
135			disp_flush();
136			break;
137	gregl	3.12	case DR_DELSET: /* delete from calculation set */
138	gregl	3.2	if (msg.nbytes % sizeof(PACKHEAD))
139			error(INTERNAL, "bad DR_DELSET from display process");
140			bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
141			break;
142	gregl	3.12	case DR_ATTEN: /* block for priority request */
143	gregl	3.2	if (msg.nbytes)
144			error(INTERNAL, "bad DR_ATTEN from display process");
145			/* send acknowledgement */
146			disp_result(DS_ACKNOW, 0, NULL);
147	gregl	3.3	return(disp_check(1)); /* block on following request */
148	gregl	3.13	case DR_KILL: /* kill computation process(es) */
149			if (msg.nbytes)
150			error(INTERNAL, "bad DR_KILL from display process");
151	gregl	3.14	if (nprocs > 0)
152			done_rtrace();
153			else
154	gregl	3.13	error(WARNING, "no rtrace process to kill");
155			break;
156			case DR_RESTART: /* restart computation process(es) */
157			if (msg.nbytes)
158			error(INTERNAL, "bad DR_RESTART from display process");
159	gregl	3.14	if (ncprocs > nprocs)
160			new_rtrace();
161			else if (nprocs > 0)
162	gregl	3.13	error(WARNING, "rtrace already runnning");
163			else
164			error(WARNING, "holodeck not open for writing");
165			break;
166			case DR_CLOBBER: /* clobber holodeck */
167			if (msg.nbytes)
168			error(INTERNAL, "bad DR_CLOBBER from display process");
169			if (!force \|\| !ncprocs)
170			error(WARNING, "request to clobber holodeck denied");
171			else {
172			error(WARNING, "clobbering holodeck contents");
173			hdclobber(NULL);
174			}
175			break;
176	gregl	3.12	case DR_SHUTDOWN: /* shut down program */
177	gregl	3.2	if (msg.nbytes)
178			error(INTERNAL, "bad DR_SHUTDOWN from display process");
179			return(0); /* zero return signals shutdown */
180	gregl	3.12	case DR_NOOP: /* do nothing */
181	gregl	3.7	break;
182	gregl	3.2	default:
183			error(INTERNAL, "unrecognized request from display process");
184			}
185	gregl	3.3	if (msg.nbytes) /* clean up */
186	gregl	3.2	free(buf);
187			return(1); /* normal return value */
188			fcntlerr:
189			error(SYSTEM, "cannot change display blocking mode");
190			readerr:
191			error(SYSTEM, "error reading from display process");
192	gregl	3.1	}
193
194
195	gregl	3.2	int
196			disp_close() /* close our display process */
197	gregl	3.1	{
198	gregl	3.2	int rval;
199
200	gregl	3.6	if (dpout == NULL)
201	gregl	3.2	return(-1);
202			disp_result(DS_SHUTDOWN, 0, NULL);
203	gregl	3.5	fclose(dpout);
204			dpout = NULL;
205	gregl	3.2	return(close_process(dpd));
206			}
207
208
209	gregl	3.5	disp_result(type, nbytes, p) /* queue result message to display process */
210	gregl	3.2	int type, nbytes;
211			char *p;
212			{
213			MSGHEAD msg;
214
215	gregl	3.6	if (dpout == NULL)
216			return;
217	gregl	3.2	msg.type = type;
218			msg.nbytes = nbytes;
219	gregl	3.5	fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);
220			if (nbytes > 0)
221			fwrite(p, 1, nbytes, dpout);
222			}
223
224
225			disp_flush() /* flush output to display */
226			{
227			if (fflush(dpout) < 0)
228			error(SYSTEM, "error writing to the display process");
229	gregl	3.1	}