src/hd/rhdisp.c

/* Copyright (c) 1997 Silicon Graphics, Inc. */

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

/*
 * Holodeck display process.
 */

#include "rholo.h"
#include "rhdisp.h"
#include "rhdriver.h"
#include "selcall.h"
#include <ctype.h>

HOLO    *hdlist[HDMAX+1];       /* global holodeck list */

char    cmdlist[DC_NCMDS][8] = DC_INIT;

int     imm_mode = 0;           /* bundles are being delivered immediately */

char    *progname;              /* global argv[0] */

FILE    *sstdin, *sstdout;      /* server's standard input and output */

#define RDY_SRV         01
#define RDY_DEV         02
#define RDY_SIN         04


main(argc, argv)
int     argc;
char    *argv[];
{
        extern int      eputs();
        int     rdy, inp, res = 0, pause = 0;

        progname = argv[0];
        if (argc < 3)
                error(USER, "bad command line arguments");
                                        /* open our device */
        dev_open(argv[1]);
                                        /* open server process i/o */
        sstdout = fdopen(atoi(argv[2]), "w");
        if (argc < 4 || (inp = atoi(argv[3])) < 0)
                sstdin = NULL;
        else
                sstdin = fdopen(inp, "r");
                                        /* set command error vector */
        erract[COMMAND].pf = eputs;
                                        /* enter main loop */
        do {
                rdy = disp_wait();
                if (rdy & RDY_DEV) {            /* user input from driver */
                        inp = dev_input();
                        if (inp & DEV_PUTVIEW)
                                printview();
                        if (inp & DEV_NEWVIEW)
                                new_view(&odev.v);
                        if (inp & DEV_SHUTDOWN)
                                serv_request(DR_SHUTDOWN, 0, NULL);
                        if (inp & DEV_REDRAW) {
                                imm_mode = 1;   /* preempt updates */
                                beam_sync();
                        }
                        if (inp & DEV_WAIT)
                                pause = 1;
                        if (inp & DEV_RESUME) {
                                serv_request(DR_NOOP, 0, NULL);
                                pause = 0;
                        }
                }
                if (rdy & RDY_SIN)              /* user input from sstdin */
                        switch (usr_input()) {
                        case DC_PAUSE:
                                pause = 1;
                                break;
                        case DC_RESUME:
                                serv_request(DR_NOOP, 0, NULL);
                                pause = 0;
                                break;
                        }
                if (rdy & RDY_SRV) {            /* process server result */
                        res = serv_result();
                        if (pause && res != DS_SHUTDOWN) {
                                serv_request(DR_ATTEN, 0, NULL);
                                while ((res = serv_result()) != DS_ACKNOW &&
                                                res != DS_SHUTDOWN)
                                        ;
                        }
                }
        } while (res != DS_SHUTDOWN);
                                        /* all done */
        quit(0);
}


int
disp_wait()                     /* wait for more input */
{
        fd_set  readset, errset;
        int     flgs;
        int     n;
        register int    i;
                                /* see if we can avoid select call */
        if (imm_mode || stdin->_cnt > 0)
                return(RDY_SRV);
        if (sstdin != NULL && sstdin->_cnt > 0)
                return(RDY_SIN);
        if (dev_flush())
                return(RDY_DEV);
                                /* make the call */
        FD_ZERO(&readset); FD_ZERO(&errset);
        FD_SET(0, &readset);
        FD_SET(0, &errset);
        FD_SET(odev.ifd, &readset);
        FD_SET(odev.ifd, &errset);
        n = odev.ifd+1;
        if (sstdin != NULL) {
                FD_SET(fileno(sstdin), &readset);
                if (fileno(sstdin) >= n)
                        n = fileno(sstdin) + 1;
        }
        n = select(n, &readset, NULL, &errset, NULL);
        if (n < 0) {
                if (errno == EINTR)
                        return(0);
                error(SYSTEM, "select call failure in disp_wait");
        }
        flgs = 0;               /* flag what's ready */
        if (FD_ISSET(0, &readset) || FD_ISSET(0, &errset))
                flgs |= RDY_SRV;
        if (FD_ISSET(odev.ifd, &readset) || FD_ISSET(odev.ifd, &errset))
                flgs |= RDY_DEV;
        if (sstdin != NULL && FD_ISSET(fileno(sstdin), &readset))
                flgs |= RDY_SIN;
        return(flgs);
}


add_holo(hdg)                   /* register a new holodeck section */
HDGRID  *hdg;
{
        VIEW    nv;
        register int    hd;

        for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
                ;
        if (hd >= HDMAX)
                error(INTERNAL, "too many holodeck sections in add_holo");
        hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
        if (hdlist[hd] == NULL)
                error(SYSTEM, "out of memory in add_holo");
        bcopy((char *)hdg, (char *)hdlist[hd], sizeof(HDGRID));
        hdcompgrid(hdlist[hd]);
        if (hd)
                return;
                                        /* set initial viewpoint */
        copystruct(&nv, &odev.v);
        VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
        VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
        VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
        fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
        VCOPY(nv.vup, hdlist[0]->xv[2]);
        new_view(&nv);
}


disp_bundle(p)                  /* display a ray bundle */
register PACKHEAD       *p;
{
        GCOORD  gc[2];
        FVECT   ro, rd, wp;
        double  d;
        register int    i;
                                        /* get beam coordinates */
        if (p->hd < 0 | p->hd >= HDMAX || hdlist[p->hd] == NULL)
                error(INTERNAL, "bad holodeck number in disp_bundle");
        if (!hdbcoord(gc, hdlist[p->hd], p->bi))
                error(INTERNAL, "bad beam index in disp_bundle");
                                        /* display each ray */
        for (i = p->nr; i--; ) {
                hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
                d = hddepth(hdlist[p->hd], packra(p)[i].d);
                VSUM(wp, ro, rd, d);            /* might be behind viewpoint */
                dev_value(packra(p)[i].v, wp, rd);
        }
}


new_view(v)                     /* change view parameters */
VIEW    *v;
{
        char    *err;

        do {
                if ((err = setview(v)) != NULL) {
                        error(COMMAND, err);
                        return;
                }
                if (v->type == VT_PAR) {
                        error(COMMAND, "cannot handle parallel views");
                        return;
                }
                dev_view(v);            /* update display driver */
                dev_flush();            /* update screen */
        } while (!beam_view(v));        /* update beam list */
}


int
usr_input()                     /* get user input and process it */
{
        VIEW    vparams;
        char    cmd[128];
        register char   *args;
        register int    i;

        if (fgets(cmd, sizeof(cmd), sstdin) == NULL)
                return(DC_QUIT);
        for (args = cmd; *args && !isspace(*args); args++)
                ;
        while (isspace(*args))
                *args++ = '\0';
        if (!*cmd)
                return(DC_RESUME);
        if (*args && args[i=strlen(args)-1] == '\n')
                args[i] = '\0';
        for (i = 0; i < DC_NCMDS; i++)
                if (!strcmp(cmd, cmdlist[i]))
                        break;
        if (i >= DC_NCMDS) {
                sprintf(errmsg, "unknown command: %s", cmd);
                error(COMMAND, errmsg);
                return(-1);
        }
        switch (i) {
        case DC_SETVIEW:                /* set the view */
                copystruct(&vparams, &odev.v);
                if (!sscanview(&vparams, args))
                        error(COMMAND, "missing view options");
                else
                        new_view(&vparams);
                break;
        case DC_GETVIEW:                /* print the current view */
                printview();
                break;
        case DC_PAUSE:                  /* pause the current calculation */
        case DC_RESUME:                 /* resume the calculation */
                /* handled in main() */
                break;
        case DC_QUIT:                   /* quit request */
                serv_request(DR_SHUTDOWN, 0, NULL);
                break;
        default:
                error(CONSISTENCY, "bad command id in usr_input");
        }
        return(i);
}


printview()                     /* print our current view to server stdout */
{
        fputs(VIEWSTR, sstdout);
        fprintview(&odev.v, sstdout);
        fputc('\n', sstdout);
        fflush(sstdout);
}


int
serv_result()                   /* get next server result and process it */
{
        static char     *buf = NULL;
        static int      bufsiz = 0;
        MSGHEAD msg;
        int     n;
                                        /* read message header */
        if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
                goto readerr;
        if (msg.nbytes > 0) {           /* get the message body */
                if (msg.nbytes > bufsiz) {
                        if (buf == NULL)
                                buf = (char *)malloc(bufsiz=msg.nbytes);
                        else
                                buf = (char *)realloc(buf, bufsiz=msg.nbytes);
                        if (buf == NULL)
                                error(SYSTEM, "out of memory in serv_result");
                }
                if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
                        goto readerr;
        }
        switch (msg.type) {             /* process results */
        case DS_BUNDLE:
                if (msg.nbytes < sizeof(PACKHEAD) ||
                                msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
                        error(INTERNAL, "bad display packet from server");
                disp_bundle((PACKHEAD *)buf);
                break;
        case DS_ADDHOLO:
                if (msg.nbytes != sizeof(HDGRID))
                        error(INTERNAL, "bad holodeck record from server");
                add_holo((HDGRID *)buf);
                break;
        case DS_STARTIMM:
        case DS_ENDIMM:
                imm_mode = msg.type==DS_STARTIMM;
                if (msg.type == DS_ENDIMM)
                        dev_flush();            /* update display NOW */
                /* fall through */
        case DS_ACKNOW:
        case DS_SHUTDOWN:
                if (msg.nbytes) {
                        sprintf(errmsg,
                                "unexpected body with server message %d",
                                        msg.type);
                        error(INTERNAL, errmsg);
                }
                break;
        default:
                error(INTERNAL, "unrecognized result from server process");
        }
        return(msg.type);               /* return message type */
readerr:
        if (feof(stdin))
                error(SYSTEM, "server process died");
        error(SYSTEM, "error reading from server process");
}


serv_request(type, nbytes, p)   /* send a request to the server process */
int     type, nbytes;
char    *p;
{
        MSGHEAD msg;
        int     m;
                                /* get server's attention for big request */
        if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
                serv_request(DR_ATTEN, 0, NULL);
                while ((m = serv_result()) != DS_ACKNOW)
                        if (m == DS_SHUTDOWN)   /* the bugger quit on us */
                                quit(0);
        }
        msg.type = type;        /* write and flush the message */
        msg.nbytes = nbytes;
        fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
        if (nbytes > 0)
                fwrite(p, 1, nbytes, stdout);
        if (fflush(stdout) < 0)
                error(SYSTEM, "write error in serv_request");
}


eputs(s)                        /* put error message to stderr */
register char  *s;
{
        static int  midline = 0;

        if (!*s)
                return;
        if (!midline++) {       /* prepend line with program name */
                fputs(progname, stderr);
                fputs(": ", stderr);
        }
        fputs(s, stderr);
        if (s[strlen(s)-1] == '\n') {
                fflush(stderr);
                midline = 0;
        }
}


quit(code)                      /* clean up and exit */
int     code;
{
        if (odev.v.type)
                dev_close();
        exit(code);
}
Revision:	3.11
Committed:	Tue Dec 9 17:12:15 1997 UTC (26 years, 4 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 3.10:	+8 -7 lines
Log Message:	fixed minor error in parsing of command arguments
#	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.
9			*/
10
11			#include "rholo.h"
12			#include "rhdisp.h"
13			#include "rhdriver.h"
14			#include "selcall.h"
15	gregl	3.10	#include <ctype.h>
16	gregl	3.1
17			HOLO hdlist[HDMAX+1]; / global holodeck list */
18
19	gregl	3.10	char cmdlist[DC_NCMDS][8] = DC_INIT;
20
21	gregl	3.1	int imm_mode = 0; /* bundles are being delivered immediately */
22
23			char progname; / global argv[0] */
24
25	gregl	3.10	FILE sstdin, sstdout; /* server's standard input and output */
26	gregl	3.1
27	gregl	3.10	#define RDY_SRV 01
28			#define RDY_DEV 02
29			#define RDY_SIN 04
30	gregl	3.1
31	gregl	3.10
32	gregl	3.1	main(argc, argv)
33			int argc;
34			char *argv[];
35			{
36	gregl	3.10	extern int eputs();
37	gregl	3.3	int rdy, inp, res = 0, pause = 0;
38	gregl	3.1
39			progname = argv[0];
40	gregl	3.10	if (argc < 3)
41	gregl	3.1	error(USER, "bad command line arguments");
42			/* open our device */
43			dev_open(argv[1]);
44	gregl	3.10	/* open server process i/o */
45			sstdout = fdopen(atoi(argv[2]), "w");
46			if (argc < 4 \|\| (inp = atoi(argv[3])) < 0)
47			sstdin = NULL;
48			else
49			sstdin = fdopen(inp, "r");
50			/* set command error vector */
51			erract[COMMAND].pf = eputs;
52	gregl	3.1	/* enter main loop */
53			do {
54			rdy = disp_wait();
55	gregl	3.10	if (rdy & RDY_DEV) { /* user input from driver */
56	gregl	3.3	inp = dev_input();
57	gregl	3.10	if (inp & DEV_PUTVIEW)
58			printview();
59	gregl	3.2	if (inp & DEV_NEWVIEW)
60			new_view(&odev.v);
61	gregl	3.1	if (inp & DEV_SHUTDOWN)
62			serv_request(DR_SHUTDOWN, 0, NULL);
63	gregl	3.4	if (inp & DEV_REDRAW) {
64	gregl	3.5	imm_mode = 1; /* preempt updates */
65	gregl	3.4	beam_sync();
66			}
67	gregl	3.2	if (inp & DEV_WAIT)
68	gregl	3.3	pause = 1;
69			if (inp & DEV_RESUME) {
70			serv_request(DR_NOOP, 0, NULL);
71			pause = 0;
72			}
73			}
74	gregl	3.10	if (rdy & RDY_SIN) /* user input from sstdin */
75			switch (usr_input()) {
76			case DC_PAUSE:
77			pause = 1;
78			break;
79			case DC_RESUME:
80			serv_request(DR_NOOP, 0, NULL);
81			pause = 0;
82			break;
83			}
84			if (rdy & RDY_SRV) { /* process server result */
85	gregl	3.3	res = serv_result();
86			if (pause && res != DS_SHUTDOWN) {
87	gregl	3.2	serv_request(DR_ATTEN, 0, NULL);
88	gregl	3.3	while ((res = serv_result()) != DS_ACKNOW &&
89			res != DS_SHUTDOWN)
90			;
91			}
92	gregl	3.2	}
93	gregl	3.1	} while (res != DS_SHUTDOWN);
94			/* all done */
95			quit(0);
96			}
97
98
99			int
100			disp_wait() /* wait for more input */
101			{
102			fd_set readset, errset;
103			int flgs;
104			int n;
105			register int i;
106			/* see if we can avoid select call */
107			if (imm_mode \|\| stdin->_cnt > 0)
108	gregl	3.4	return(RDY_SRV);
109	gregl	3.10	if (sstdin != NULL && sstdin->_cnt > 0)
110			return(RDY_SIN);
111	gregl	3.1	if (dev_flush())
112	gregl	3.4	return(RDY_DEV);
113	gregl	3.1	/* make the call */
114			FD_ZERO(&readset); FD_ZERO(&errset);
115			FD_SET(0, &readset);
116			FD_SET(0, &errset);
117			FD_SET(odev.ifd, &readset);
118			FD_SET(odev.ifd, &errset);
119	gregl	3.10	n = odev.ifd+1;
120			if (sstdin != NULL) {
121			FD_SET(fileno(sstdin), &readset);
122			if (fileno(sstdin) >= n)
123			n = fileno(sstdin) + 1;
124			}
125	gregl	3.1	n = select(n, &readset, NULL, &errset, NULL);
126			if (n < 0) {
127			if (errno == EINTR)
128			return(0);
129			error(SYSTEM, "select call failure in disp_wait");
130			}
131			flgs = 0; /* flag what's ready */
132			if (FD_ISSET(0, &readset) \|\| FD_ISSET(0, &errset))
133	gregl	3.4	flgs \|= RDY_SRV;
134	gregl	3.1	if (FD_ISSET(odev.ifd, &readset) \|\| FD_ISSET(odev.ifd, &errset))
135	gregl	3.4	flgs \|= RDY_DEV;
136	gregl	3.10	if (sstdin != NULL && FD_ISSET(fileno(sstdin), &readset))
137			flgs \|= RDY_SIN;
138	gregl	3.1	return(flgs);
139			}
140
141
142			add_holo(hdg) /* register a new holodeck section */
143			HDGRID *hdg;
144			{
145			VIEW nv;
146			register int hd;
147
148			for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
149			;
150			if (hd >= HDMAX)
151			error(INTERNAL, "too many holodeck sections in add_holo");
152			hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
153			if (hdlist[hd] == NULL)
154			error(SYSTEM, "out of memory in add_holo");
155			bcopy((char )hdg, (char )hdlist[hd], sizeof(HDGRID));
156			hdcompgrid(hdlist[hd]);
157			if (hd)
158			return;
159			/* set initial viewpoint */
160			copystruct(&nv, &odev.v);
161			VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
162			VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
163			VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
164			fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
165			VCOPY(nv.vup, hdlist[0]->xv[2]);
166			new_view(&nv);
167			}
168
169
170			disp_bundle(p) /* display a ray bundle */
171			register PACKHEAD *p;
172			{
173			GCOORD gc[2];
174			FVECT ro, rd, wp;
175			double d;
176			register int i;
177			/* get beam coordinates */
178			if (p->hd < 0 \| p->hd >= HDMAX \|\| hdlist[p->hd] == NULL)
179			error(INTERNAL, "bad holodeck number in disp_bundle");
180			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
181			error(INTERNAL, "bad beam index in disp_bundle");
182			/* display each ray */
183			for (i = p->nr; i--; ) {
184			hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
185			d = hddepth(hdlist[p->hd], packra(p)[i].d);
186			VSUM(wp, ro, rd, d); /* might be behind viewpoint */
187	gregl	3.9	dev_value(packra(p)[i].v, wp, rd);
188	gregl	3.1	}
189			}
190
191
192			new_view(v) /* change view parameters */
193			VIEW *v;
194			{
195			char *err;
196
197	gregl	3.8	do {
198	gregl	3.10	if ((err = setview(v)) != NULL) {
199			error(COMMAND, err);
200			return;
201			}
202			if (v->type == VT_PAR) {
203			error(COMMAND, "cannot handle parallel views");
204			return;
205			}
206	gregl	3.8	dev_view(v); /* update display driver */
207			dev_flush(); /* update screen */
208			} while (!beam_view(v)); /* update beam list */
209	gregl	3.10	}
210
211
212			int
213			usr_input() /* get user input and process it */
214			{
215			VIEW vparams;
216			char cmd[128];
217			register char *args;
218	gregl	3.11	register int i;
219	gregl	3.10
220			if (fgets(cmd, sizeof(cmd), sstdin) == NULL)
221			return(DC_QUIT);
222			for (args = cmd; args && !isspace(args); args++)
223			;
224			while (isspace(*args))
225			*args++ = '\0';
226			if (!*cmd)
227			return(DC_RESUME);
228	gregl	3.11	if (*args && args[i=strlen(args)-1] == '\n')
229			args[i] = '\0';
230			for (i = 0; i < DC_NCMDS; i++)
231			if (!strcmp(cmd, cmdlist[i]))
232	gregl	3.10	break;
233	gregl	3.11	if (i >= DC_NCMDS) {
234	gregl	3.10	sprintf(errmsg, "unknown command: %s", cmd);
235			error(COMMAND, errmsg);
236			return(-1);
237			}
238	gregl	3.11	switch (i) {
239	gregl	3.10	case DC_SETVIEW: /* set the view */
240			copystruct(&vparams, &odev.v);
241			if (!sscanview(&vparams, args))
242			error(COMMAND, "missing view options");
243			else
244			new_view(&vparams);
245			break;
246			case DC_GETVIEW: /* print the current view */
247			printview();
248			break;
249			case DC_PAUSE: /* pause the current calculation */
250			case DC_RESUME: /* resume the calculation */
251			/* handled in main() */
252			break;
253			case DC_QUIT: /* quit request */
254			serv_request(DR_SHUTDOWN, 0, NULL);
255			break;
256			default:
257			error(CONSISTENCY, "bad command id in usr_input");
258			}
259	gregl	3.11	return(i);
260	gregl	3.10	}
261
262
263			printview() /* print our current view to server stdout */
264			{
265			fputs(VIEWSTR, sstdout);
266			fprintview(&odev.v, sstdout);
267			fputc('\n', sstdout);
268			fflush(sstdout);
269	gregl	3.1	}
270
271
272			int
273			serv_result() /* get next server result and process it */
274			{
275			static char *buf = NULL;
276			static int bufsiz = 0;
277			MSGHEAD msg;
278			int n;
279			/* read message header */
280			if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
281			goto readerr;
282			if (msg.nbytes > 0) { /* get the message body */
283			if (msg.nbytes > bufsiz) {
284			if (buf == NULL)
285			buf = (char *)malloc(bufsiz=msg.nbytes);
286			else
287			buf = (char *)realloc(buf, bufsiz=msg.nbytes);
288			if (buf == NULL)
289			error(SYSTEM, "out of memory in serv_result");
290			}
291			if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
292			goto readerr;
293			}
294			switch (msg.type) { /* process results */
295			case DS_BUNDLE:
296			if (msg.nbytes < sizeof(PACKHEAD) \|\|
297			msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
298			error(INTERNAL, "bad display packet from server");
299			disp_bundle((PACKHEAD *)buf);
300			break;
301			case DS_ADDHOLO:
302			if (msg.nbytes != sizeof(HDGRID))
303			error(INTERNAL, "bad holodeck record from server");
304			add_holo((HDGRID *)buf);
305			break;
306			case DS_STARTIMM:
307			case DS_ENDIMM:
308			imm_mode = msg.type==DS_STARTIMM;
309	gregl	3.7	if (msg.type == DS_ENDIMM)
310			dev_flush(); /* update display NOW */
311	gregl	3.1	/* fall through */
312			case DS_ACKNOW:
313			case DS_SHUTDOWN:
314			if (msg.nbytes) {
315			sprintf(errmsg,
316			"unexpected body with server message %d",
317			msg.type);
318			error(INTERNAL, errmsg);
319			}
320			break;
321			default:
322			error(INTERNAL, "unrecognized result from server process");
323			}
324			return(msg.type); /* return message type */
325			readerr:
326			if (feof(stdin))
327			error(SYSTEM, "server process died");
328			error(SYSTEM, "error reading from server process");
329			}
330
331
332			serv_request(type, nbytes, p) /* send a request to the server process */
333			int type, nbytes;
334			char *p;
335			{
336			MSGHEAD msg;
337			int m;
338			/* get server's attention for big request */
339			if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
340			serv_request(DR_ATTEN, 0, NULL);
341			while ((m = serv_result()) != DS_ACKNOW)
342			if (m == DS_SHUTDOWN) /* the bugger quit on us */
343			quit(0);
344			}
345			msg.type = type; /* write and flush the message */
346			msg.nbytes = nbytes;
347			fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
348			if (nbytes > 0)
349			fwrite(p, 1, nbytes, stdout);
350			if (fflush(stdout) < 0)
351			error(SYSTEM, "write error in serv_request");
352	gregl	3.2	}
353
354
355			eputs(s) /* put error message to stderr */
356			register char *s;
357			{
358			static int midline = 0;
359
360			if (!*s)
361			return;
362			if (!midline++) { /* prepend line with program name */
363			fputs(progname, stderr);
364			fputs(": ", stderr);
365			}
366			fputs(s, stderr);
367			if (s[strlen(s)-1] == '\n') {
368			fflush(stderr);
369			midline = 0;
370			}
371	gregl	3.1	}
372
373
374			quit(code) /* clean up and exit */
375			int code;
376			{
377			if (odev.v.type)
378			dev_close();
379			exit(code);
380			}