src/rt/devcomm.c

/* Copyright (c) 1988 Regents of the University of California */

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

/*
 *  devcomm.c - communication routines for separate drivers.
 *
 *      10/5/88
 */

#include "standard.h"

#include "color.h"

#include "driver.h"

#include "vfork.h"

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

#ifndef DELAY
#define DELAY           20              /* seconds to wait for response */
#endif

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

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

FILE    *devin, *devout;

int     devchild;


struct driver *
comm_init(dname, id)                    /* set up and execute driver */
char    *dname, *id;
{
        char    *devname;
        int     p1[2], p2[2];
        char    pin[16], pout[16];
                                                /* find driver program */
        if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) {
                stderr_v(dname);
                stderr_v(": 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(devname, dname, pin, pout, id, 0);
                perror(devname);
                _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;
                                                /* verify initialization */
        putw(COM_SENDM, devout);
        fflush(devout);
        if (getw(devin) != COM_RECVM)
                return(NULL);
                                                /* get driver parameters */
        getstate();
                                                /* set error vectors */
        cmdvec = comm_comout;
        if (wrnvec != NULL)
                wrnvec = comm_comout;
        return(&comm_driver);
syserr:
        perror(dname);
        return(NULL);
}


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

        cmdvec = NULL;                          /* reset error vectors */
        if (wrnvec != NULL)
                wrnvec = stderr_v;
        fclose(devout);
        fclose(devin);
        while ((pid = wait(0)) != -1 && pid != devchild)
                ;
}


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


static
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
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
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
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
comm_errout(str)                        /* display an error message */
char    *str;
{
        comm_comout(str);
        stderr_v(str);                  /* send to standard error also */
}


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


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


static
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:	2.2
Committed:	Thu Mar 19 09:34:02 1992 UTC (32 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.1:	+2 -4 lines
Log Message:	added vfork.h include
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1988 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* devcomm.c - communication routines for separate drivers.
9			*
10			* 10/5/88
11			*/
12
13	greg	1.10	#include "standard.h"
14	greg	1.1
15			#include "color.h"
16
17			#include "driver.h"
18
19	greg	2.2	#include "vfork.h"
20
21	greg	1.1	#ifndef DEVPATH
22			#define DEVPATH getenv("PATH") /* device search path */
23			#endif
24
25	greg	1.15	#ifndef DELAY
26			#define DELAY 20 /* seconds to wait for response */
27	greg	1.1	#endif
28
29	greg	1.16	static int comm_close(), comm_clear(), comm_paintr(), comm_errout(),
30	greg	1.12	comm_getcur(), comm_comout(), comm_comin(), comm_flush();
31	greg	1.1
32	greg	1.12	struct driver comm_driver = {
33	greg	1.1	comm_close, comm_clear, comm_paintr, comm_getcur,
34	greg	1.12	comm_comout, comm_comin, comm_flush
35	greg	1.1	};
36
37			FILE devin, devout;
38
39			int devchild;
40
41
42			struct driver *
43	greg	1.7	comm_init(dname, id) /* set up and execute driver */
44			char dname, id;
45	greg	1.1	{
46			char *devname;
47			int p1[2], p2[2];
48	greg	1.7	char pin[16], pout[16];
49			/* find driver program */
50	greg	1.19	if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) {
51	greg	1.7	stderr_v(dname);
52	greg	1.1	stderr_v(": not found\n");
53			return(NULL);
54			}
55	greg	1.7	/* open communication pipes */
56	greg	1.1	if (pipe(p1) == -1 \|\| pipe(p2) == -1)
57			goto syserr;
58	greg	1.7	if ((devchild = vfork()) == 0) { /* fork driver process */
59	greg	1.1	close(p1[1]);
60			close(p2[0]);
61	greg	1.7	sprintf(pin, "%d", p1[0]);
62			sprintf(pout, "%d", p2[1]);
63			execl(devname, dname, pin, pout, id, 0);
64			perror(devname);
65	greg	1.1	_exit(127);
66			}
67			if (devchild == -1)
68			goto syserr;
69			close(p1[0]);
70			close(p2[1]);
71			if ((devout = fdopen(p1[1], "w")) == NULL)
72			goto syserr;
73			if ((devin = fdopen(p2[0], "r")) == NULL)
74			goto syserr;
75	greg	1.15	/* verify initialization */
76	greg	1.7	putw(COM_SENDM, devout);
77			fflush(devout);
78			if (getw(devin) != COM_RECVM)
79			return(NULL);
80	greg	1.15	/* get driver parameters */
81	greg	1.17	getstate();
82	greg	1.7	/* set error vectors */
83			cmdvec = comm_comout;
84	greg	1.1	if (wrnvec != NULL)
85			wrnvec = comm_comout;
86			return(&comm_driver);
87			syserr:
88	greg	1.7	perror(dname);
89	greg	1.1	return(NULL);
90			}
91
92
93			static
94			comm_close() /* done with driver */
95			{
96			int pid;
97
98	greg	1.2	cmdvec = NULL; /* reset error vectors */
99	greg	1.1	if (wrnvec != NULL)
100			wrnvec = stderr_v;
101			fclose(devout);
102			fclose(devin);
103			while ((pid = wait(0)) != -1 && pid != devchild)
104			;
105			}
106
107
108			static
109			comm_clear(xres, yres) /* clear screen */
110			int xres, yres;
111			{
112			putc(COM_CLEAR, devout);
113	greg	1.8	putw(xres, devout);
114			putw(yres, devout);
115	greg	1.1	fflush(devout);
116			}
117
118
119			static
120			comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
121			COLOR col;
122			int xmin, ymin, xmax, ymax;
123			{
124			putc(COM_PAINTR, devout);
125	greg	1.10	fwrite((char *)col, sizeof(COLOR), 1, devout);
126	greg	1.8	putw(xmin, devout);
127			putw(ymin, devout);
128			putw(xmax, devout);
129			putw(ymax, devout);
130	greg	1.12	}
131
132
133			static
134			comm_flush() /* flush output to driver */
135			{
136			putc(COM_FLUSH, devout);
137			fflush(devout);
138	greg	1.13	if (getc(devin) != COM_FLUSH)
139			reply_error("flush");
140	greg	1.17	getstate();
141	greg	1.1	}
142
143
144			static int
145			comm_getcur(xp, yp) /* get and return cursor position */
146			int xp, yp;
147			{
148			int c;
149
150			putc(COM_GETCUR, devout);
151			fflush(devout);
152			if (getc(devin) != COM_GETCUR)
153			reply_error("getcur");
154			c = getc(devin);
155	greg	1.8	*xp = getw(devin);
156			*yp = getw(devin);
157	greg	1.1	return(c);
158			}
159
160
161			static
162			comm_comout(str) /* print string to command line */
163			char *str;
164			{
165			putc(COM_COMOUT, devout);
166			myputs(str, devout);
167	greg	1.18	if (str[strlen(str)-1] == '\n')
168			fflush(devout);
169	greg	1.1	}
170
171
172			static
173	greg	1.11	comm_comin(buf, prompt) /* read string from command line */
174	greg	1.1	char *buf;
175	greg	1.11	char *prompt;
176	greg	1.1	{
177			putc(COM_COMIN, devout);
178	greg	1.11	if (prompt == NULL)
179			putc(0, devout);
180			else {
181			putc(1, devout);
182			myputs(prompt, devout);
183			}
184	greg	1.1	fflush(devout);
185			if (getc(devin) != COM_COMIN)
186			reply_error("comin");
187			mygets(buf, devin);
188	greg	1.17	getstate();
189	greg	1.1	}
190
191
192			static
193			comm_errout(str) /* display an error message */
194			char *str;
195			{
196			comm_comout(str);
197			stderr_v(str); /* send to standard error also */
198			}
199
200
201			static
202			mygets(s, fp) /* get string from file (with nul) */
203			register char *s;
204			register FILE *fp;
205			{
206			register int c;
207
208			while ((c = getc(fp)) != EOF)
209			if ((*s++ = c) == '\0')
210			return;
211			*s = '\0';
212			}
213
214
215			static
216			myputs(s, fp) /* put string to file (with nul) */
217			register char *s;
218			register FILE *fp;
219			{
220			do
221			putc(*s, fp);
222			while (*s++);
223			}
224
225
226			static
227			reply_error(routine) /* what should we do here? */
228			char *routine;
229			{
230			stderr_v(routine);
231			stderr_v(": driver reply error\n");
232			quit(1);
233	greg	1.17	}
234
235
236			static
237			getstate() /* get driver state variables */
238			{
239			fread((char *)&comm_driver.pixaspect,
240			sizeof(comm_driver.pixaspect), 1, devin);
241			comm_driver.xsiz = getw(devin);
242			comm_driver.ysiz = getw(devin);
243			comm_driver.inpready = getw(devin);
244	greg	1.1	}