src/rt/devcomm.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  devcomm.c - communication routines for separate drivers.
 *
 *  External symbols declared in driver.h
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

#include "standard.h"

#include "color.h"

#include "driver.h"

#include "vfork.h"

#ifndef DEVPATH
#define DEVPATH         getenv("PATH")  /* device search path */
#endif

static int      comm_getcur();
static void     comm_close(), comm_clear(), comm_paintr(),
                comm_comin(), comm_comout(), comm_flush();

struct driver   comm_driver = {
        comm_close, comm_clear, comm_paintr, comm_getcur,
        comm_comout, comm_comin, comm_flush
};

static void     mygets(), myputs(), reply_error(), getstate();

FILE    *devin, *devout;

int     devchild;


static struct driver *
final_connect()                         /* verify and initialize connection */
{
        putw(COM_SENDM, devout);
        fflush(devout);
        if (getw(devin) != COM_RECVM)
                return(NULL);
                                                /* get driver parameters */
        getstate();
                                                /* set error vectors */
        erract[COMMAND].pf = comm_comout;
        if (erract[WARNING].pf != NULL)
                erract[WARNING].pf = comm_comout;
        return(&comm_driver);
}


struct driver *
slave_init(dname, id)                   /* run rview in slave mode */
char    *dname, *id;
{
        devchild = -1;                          /* we're the slave here */
        devout = stdout;                        /* use standard input */
        devin = stdin;                          /* and standard output */
        return(final_connect());                /* verify initialization */
}


struct driver *
comm_init(dname, id)                    /* set up and execute driver */
char    *dname, *id;
{
        char    *dvcname;
        int     p1[2], p2[2];
        char    pin[16], pout[16];
                                                /* find driver program */
        if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) {
                eputs(dname);
                eputs(": not found\n");
                return(NULL);
        }
                                                /* open communication pipes */
        if (pipe(p1) == -1 || pipe(p2) == -1)
                goto syserr;
        if ((devchild = vfork()) == 0) {        /* fork driver process */
                close(p1[1]);
                close(p2[0]);
                sprintf(pin, "%d", p1[0]);
                sprintf(pout, "%d", p2[1]);
                execl(dvcname, dname, pin, pout, id, 0);
                perror(dvcname);
                _exit(127);
        }
        if (devchild == -1)
                goto syserr;
        close(p1[0]);
        close(p2[1]);
        if ((devout = fdopen(p1[1], "w")) == NULL)
                goto syserr;
        if ((devin = fdopen(p2[0], "r")) == NULL)
                goto syserr;
        return(final_connect());                /* verify initialization */
syserr:
        perror(dname);
        return(NULL);
}


static void
comm_close()                    /* done with driver */
{
        int     pid;

        erract[COMMAND].pf = NULL;              /* reset error vectors */
        if (erract[WARNING].pf != NULL)
                erract[WARNING].pf = wputs;
        fclose(devout);
        fclose(devin);
        if (devchild < 0)
                return;
        while ((pid = wait(0)) != -1 && pid != devchild)
                ;
}


static void
comm_clear(xres, yres)                          /* clear screen */
int     xres, yres;
{
        putc(COM_CLEAR, devout);
        putw(xres, devout);
        putw(yres, devout);
        fflush(devout);
}


static void
comm_paintr(col, xmin, ymin, xmax, ymax)        /* paint a rectangle */
COLOR   col;
int     xmin, ymin, xmax, ymax;
{
        putc(COM_PAINTR, devout);
        fwrite((char *)col, sizeof(COLOR), 1, devout);
        putw(xmin, devout);
        putw(ymin, devout);
        putw(xmax, devout);
        putw(ymax, devout);
}


static void
comm_flush()                            /* flush output to driver */
{
        putc(COM_FLUSH, devout);
        fflush(devout);
        if (getc(devin) != COM_FLUSH)
                reply_error("flush");
        getstate();
}


static int
comm_getcur(xp, yp)                     /* get and return cursor position */
int     *xp, *yp;
{
        int     c;

        putc(COM_GETCUR, devout);
        fflush(devout);
        if (getc(devin) != COM_GETCUR)
                reply_error("getcur");
        c = getc(devin);
        *xp = getw(devin);
        *yp = getw(devin);
        return(c);
}


static void
comm_comout(str)                        /* print string to command line */
char    *str;
{
        putc(COM_COMOUT, devout);
        myputs(str, devout);
        if (str[strlen(str)-1] == '\n')
                fflush(devout);
}


static void
comm_comin(buf, prompt)                 /* read string from command line */
char    *buf;
char    *prompt;
{
        putc(COM_COMIN, devout);
        if (prompt == NULL)
                putc(0, devout);
        else {
                putc(1, devout);
                myputs(prompt, devout);
        }
        fflush(devout);
        if (getc(devin) != COM_COMIN)
                reply_error("comin");
        mygets(buf, devin);
        getstate();
}


static void
mygets(s, fp)                           /* get string from file (with nul) */
register char   *s;
register FILE   *fp;
{
        register int    c;

        while ((c = getc(fp)) != EOF)
                if ((*s++ = c) == '\0')
                        return;
        *s = '\0';
}


static void
myputs(s, fp)                           /* put string to file (with nul) */
register char   *s;
register FILE   *fp;
{
        do
                putc(*s, fp);
        while (*s++);
}


static void
reply_error(routine)                    /* what should we do here? */
char    *routine;
{
        eputs(routine);
        eputs(": driver reply error\n");
        quit(1);
}


static void
getstate()                              /* get driver state variables */
{
        fread((char *)&comm_driver.pixaspect,
                        sizeof(comm_driver.pixaspect), 1, devin);
        comm_driver.xsiz = getw(devin);
        comm_driver.ysiz = getw(devin);
        comm_driver.inpready = getw(devin);
}
Revision:	2.6
Committed:	Sat Feb 22 02:07:28 2003 UTC (22 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.5:	+77 -22 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id$";
3	#endif
4	/*
5	* devcomm.c - communication routines for separate drivers.
6	*
7	* External symbols declared in driver.h
8	*/
9
10	/* ====================================================================
11	* The Radiance Software License, Version 1.0
12	*
13	* Copyright (c) 1990 - 2002 The Regents of the University of California,
14	* through Lawrence Berkeley National Laboratory. All rights reserved.
15	*
16	* Redistribution and use in source and binary forms, with or without
17	* modification, are permitted provided that the following conditions
18	* are met:
19	*
20	* 1. Redistributions of source code must retain the above copyright
21	* notice, this list of conditions and the following disclaimer.
22	*
23	* 2. Redistributions in binary form must reproduce the above copyright
24	* notice, this list of conditions and the following disclaimer in
25	* the documentation and/or other materials provided with the
26	* distribution.
27	*
28	* 3. The end-user documentation included with the redistribution,
29	* if any, must include the following acknowledgment:
30	* "This product includes Radiance software
31	* (http://radsite.lbl.gov/)
32	* developed by the Lawrence Berkeley National Laboratory
33	* (http://www.lbl.gov/)."
34	* Alternately, this acknowledgment may appear in the software itself,
35	* if and wherever such third-party acknowledgments normally appear.
36	*
37	* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
38	* and "The Regents of the University of California" must
39	* not be used to endorse or promote products derived from this
40	* software without prior written permission. For written
41	* permission, please contact [email protected].
42	*
43	* 5. Products derived from this software may not be called "Radiance",
44	* nor may "Radiance" appear in their name, without prior written
45	* permission of Lawrence Berkeley National Laboratory.
46	*
47	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
48	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
50	* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
51	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
53	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
54	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
55	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
56	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
57	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58	* SUCH DAMAGE.
59	* ====================================================================
60	*
61	* This software consists of voluntary contributions made by many
62	* individuals on behalf of Lawrence Berkeley National Laboratory. For more
63	* information on Lawrence Berkeley National Laboratory, please see
64	* <http://www.lbl.gov/>.
65	*/
66
67	#include "standard.h"
68
69	#include "color.h"
70
71	#include "driver.h"
72
73	#include "vfork.h"
74
75	#ifndef DEVPATH
76	#define DEVPATH getenv("PATH") /* device search path */
77	#endif
78
79	static int comm_getcur();
80	static void comm_close(), comm_clear(), comm_paintr(),
81	comm_comin(), comm_comout(), comm_flush();
82
83	struct driver comm_driver = {
84	comm_close, comm_clear, comm_paintr, comm_getcur,
85	comm_comout, comm_comin, comm_flush
86	};
87
88	static void mygets(), myputs(), reply_error(), getstate();
89
90	FILE devin, devout;
91
92	int devchild;
93
94
95	static struct driver *
96	final_connect() /* verify and initialize connection */
97	{
98	putw(COM_SENDM, devout);
99	fflush(devout);
100	if (getw(devin) != COM_RECVM)
101	return(NULL);
102	/* get driver parameters */
103	getstate();
104	/* set error vectors */
105	erract[COMMAND].pf = comm_comout;
106	if (erract[WARNING].pf != NULL)
107	erract[WARNING].pf = comm_comout;
108	return(&comm_driver);
109	}
110
111
112	struct driver *
113	slave_init(dname, id) /* run rview in slave mode */
114	char dname, id;
115	{
116	devchild = -1; /* we're the slave here */
117	devout = stdout; /* use standard input */
118	devin = stdin; /* and standard output */
119	return(final_connect()); /* verify initialization */
120	}
121
122
123	struct driver *
124	comm_init(dname, id) /* set up and execute driver */
125	char dname, id;
126	{
127	char *dvcname;
128	int p1[2], p2[2];
129	char pin[16], pout[16];
130	/* find driver program */
131	if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) {
132	eputs(dname);
133	eputs(": not found\n");
134	return(NULL);
135	}
136	/* open communication pipes */
137	if (pipe(p1) == -1 \|\| pipe(p2) == -1)
138	goto syserr;
139	if ((devchild = vfork()) == 0) { /* fork driver process */
140	close(p1[1]);
141	close(p2[0]);
142	sprintf(pin, "%d", p1[0]);
143	sprintf(pout, "%d", p2[1]);
144	execl(dvcname, dname, pin, pout, id, 0);
145	perror(dvcname);
146	_exit(127);
147	}
148	if (devchild == -1)
149	goto syserr;
150	close(p1[0]);
151	close(p2[1]);
152	if ((devout = fdopen(p1[1], "w")) == NULL)
153	goto syserr;
154	if ((devin = fdopen(p2[0], "r")) == NULL)
155	goto syserr;
156	return(final_connect()); /* verify initialization */
157	syserr:
158	perror(dname);
159	return(NULL);
160	}
161
162
163	static void
164	comm_close() /* done with driver */
165	{
166	int pid;
167
168	erract[COMMAND].pf = NULL; /* reset error vectors */
169	if (erract[WARNING].pf != NULL)
170	erract[WARNING].pf = wputs;
171	fclose(devout);
172	fclose(devin);
173	if (devchild < 0)
174	return;
175	while ((pid = wait(0)) != -1 && pid != devchild)
176	;
177	}
178
179
180	static void
181	comm_clear(xres, yres) /* clear screen */
182	int xres, yres;
183	{
184	putc(COM_CLEAR, devout);
185	putw(xres, devout);
186	putw(yres, devout);
187	fflush(devout);
188	}
189
190
191	static void
192	comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
193	COLOR col;
194	int xmin, ymin, xmax, ymax;
195	{
196	putc(COM_PAINTR, devout);
197	fwrite((char *)col, sizeof(COLOR), 1, devout);
198	putw(xmin, devout);
199	putw(ymin, devout);
200	putw(xmax, devout);
201	putw(ymax, devout);
202	}
203
204
205	static void
206	comm_flush() /* flush output to driver */
207	{
208	putc(COM_FLUSH, devout);
209	fflush(devout);
210	if (getc(devin) != COM_FLUSH)
211	reply_error("flush");
212	getstate();
213	}
214
215
216	static int
217	comm_getcur(xp, yp) /* get and return cursor position */
218	int xp, yp;
219	{
220	int c;
221
222	putc(COM_GETCUR, devout);
223	fflush(devout);
224	if (getc(devin) != COM_GETCUR)
225	reply_error("getcur");
226	c = getc(devin);
227	*xp = getw(devin);
228	*yp = getw(devin);
229	return(c);
230	}
231
232
233	static void
234	comm_comout(str) /* print string to command line */
235	char *str;
236	{
237	putc(COM_COMOUT, devout);
238	myputs(str, devout);
239	if (str[strlen(str)-1] == '\n')
240	fflush(devout);
241	}
242
243
244	static void
245	comm_comin(buf, prompt) /* read string from command line */
246	char *buf;
247	char *prompt;
248	{
249	putc(COM_COMIN, devout);
250	if (prompt == NULL)
251	putc(0, devout);
252	else {
253	putc(1, devout);
254	myputs(prompt, devout);
255	}
256	fflush(devout);
257	if (getc(devin) != COM_COMIN)
258	reply_error("comin");
259	mygets(buf, devin);
260	getstate();
261	}
262
263
264	static void
265	mygets(s, fp) /* get string from file (with nul) */
266	register char *s;
267	register FILE *fp;
268	{
269	register int c;
270
271	while ((c = getc(fp)) != EOF)
272	if ((*s++ = c) == '\0')
273	return;
274	*s = '\0';
275	}
276
277
278	static void
279	myputs(s, fp) /* put string to file (with nul) */
280	register char *s;
281	register FILE *fp;
282	{
283	do
284	putc(*s, fp);
285	while (*s++);
286	}
287
288
289	static void
290	reply_error(routine) /* what should we do here? */
291	char *routine;
292	{
293	eputs(routine);
294	eputs(": driver reply error\n");
295	quit(1);
296	}
297
298
299	static void
300	getstate() /* get driver state variables */
301	{
302	fread((char *)&comm_driver.pixaspect,
303	sizeof(comm_driver.pixaspect), 1, devin);
304	comm_driver.xsiz = getw(devin);
305	comm_driver.ysiz = getw(devin);
306	comm_driver.inpready = getw(devin);
307	}