src/rt/devcomm.c

#ifndef lint
static const char       RCSid[] = "$Id: devcomm.c,v 2.10 2003/11/10 16:52:25 greg Exp $";
#endif
/*
 *  devcomm.c - communication routines for separate drivers.
 *
 *  External symbols declared in driver.h
 */

#include "copyright.h"

#include "platform.h"

#include "standard.h"

#include "driver.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);
        }
#ifdef RHAS_FORK_EXEC
                                                /* open communication pipes */
        if (pipe(p1) == -1 || pipe(p2) == -1)
                goto syserr;
        if ((devchild = fork()) == 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);

#else   /* ! RHAS_FORK_EXEC */

        eputs(dname);
        eputs(": no fork/exec\n");
        return(NULL);

#endif  /* ! RHAS_FORK_EXEC */
}


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:	2.11
Committed:	Tue Nov 11 16:24:06 2003 UTC (20 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.10:	+2 -4 lines
Log Message:	Replaced all calls to vfork() with regular fork() calls
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.11	static const char RCSid[] = "$Id: devcomm.c,v 2.10 2003/11/10 16:52:25 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* devcomm.c - communication routines for separate drivers.
6			*
7	greg	2.6	* External symbols declared in driver.h
8			*/
9
10	greg	2.7	#include "copyright.h"
11	greg	2.9
12	greg	2.10	#include "platform.h"
13	greg	1.1
14	greg	1.10	#include "standard.h"
15	greg	1.1
16			#include "driver.h"
17	greg	2.2
18	greg	1.1	#ifndef DEVPATH
19			#define DEVPATH getenv("PATH") /* device search path */
20			#endif
21
22	greg	2.6	static int comm_getcur();
23			static void comm_close(), comm_clear(), comm_paintr(),
24			comm_comin(), comm_comout(), comm_flush();
25	greg	1.1
26	greg	1.12	struct driver comm_driver = {
27	greg	1.1	comm_close, comm_clear, comm_paintr, comm_getcur,
28	greg	1.12	comm_comout, comm_comin, comm_flush
29	greg	1.1	};
30
31	greg	2.6	static void mygets(), myputs(), reply_error(), getstate();
32	greg	2.4
33	greg	1.1	FILE devin, devout;
34
35			int devchild;
36
37
38	greg	2.3	static struct driver *
39			final_connect() /* verify and initialize connection */
40			{
41			putw(COM_SENDM, devout);
42			fflush(devout);
43			if (getw(devin) != COM_RECVM)
44			return(NULL);
45			/* get driver parameters */
46			getstate();
47			/* set error vectors */
48	gregl	2.5	erract[COMMAND].pf = comm_comout;
49			if (erract[WARNING].pf != NULL)
50			erract[WARNING].pf = comm_comout;
51	greg	2.3	return(&comm_driver);
52			}
53
54
55	greg	1.1	struct driver *
56	greg	2.3	slave_init(dname, id) /* run rview in slave mode */
57			char dname, id;
58			{
59			devchild = -1; /* we're the slave here */
60			devout = stdout; /* use standard input */
61			devin = stdin; /* and standard output */
62			return(final_connect()); /* verify initialization */
63			}
64
65
66			struct driver *
67	greg	1.7	comm_init(dname, id) /* set up and execute driver */
68			char dname, id;
69	greg	1.1	{
70	greg	2.6	char *dvcname;
71	greg	1.1	int p1[2], p2[2];
72	greg	1.7	char pin[16], pout[16];
73			/* find driver program */
74	greg	2.6	if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) {
75	gregl	2.5	eputs(dname);
76			eputs(": not found\n");
77	greg	1.1	return(NULL);
78			}
79	greg	2.8	#ifdef RHAS_FORK_EXEC
80	greg	1.7	/* open communication pipes */
81	greg	1.1	if (pipe(p1) == -1 \|\| pipe(p2) == -1)
82			goto syserr;
83	greg	2.11	if ((devchild = fork()) == 0) { /* fork driver process */
84	greg	1.1	close(p1[1]);
85			close(p2[0]);
86	greg	1.7	sprintf(pin, "%d", p1[0]);
87			sprintf(pout, "%d", p2[1]);
88	greg	2.6	execl(dvcname, dname, pin, pout, id, 0);
89			perror(dvcname);
90	greg	1.1	_exit(127);
91			}
92			if (devchild == -1)
93			goto syserr;
94			close(p1[0]);
95			close(p2[1]);
96			if ((devout = fdopen(p1[1], "w")) == NULL)
97			goto syserr;
98			if ((devin = fdopen(p2[0], "r")) == NULL)
99			goto syserr;
100	greg	2.3	return(final_connect()); /* verify initialization */
101	greg	1.1	syserr:
102	greg	1.7	perror(dname);
103	greg	1.1	return(NULL);
104	greg	2.8
105			#else /* ! RHAS_FORK_EXEC */
106
107			eputs(dname);
108			eputs(": no fork/exec\n");
109			return(NULL);
110
111			#endif /* ! RHAS_FORK_EXEC */
112	greg	1.1	}
113
114
115	greg	2.6	static void
116	greg	1.1	comm_close() /* done with driver */
117			{
118			int pid;
119
120	gregl	2.5	erract[COMMAND].pf = NULL; /* reset error vectors */
121			if (erract[WARNING].pf != NULL)
122			erract[WARNING].pf = wputs;
123	greg	1.1	fclose(devout);
124			fclose(devin);
125	greg	2.3	if (devchild < 0)
126			return;
127	greg	1.1	while ((pid = wait(0)) != -1 && pid != devchild)
128			;
129			}
130
131
132	greg	2.6	static void
133	greg	1.1	comm_clear(xres, yres) /* clear screen */
134			int xres, yres;
135			{
136			putc(COM_CLEAR, devout);
137	greg	1.8	putw(xres, devout);
138			putw(yres, devout);
139	greg	1.1	fflush(devout);
140			}
141
142
143	greg	2.6	static void
144	greg	1.1	comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
145			COLOR col;
146			int xmin, ymin, xmax, ymax;
147			{
148			putc(COM_PAINTR, devout);
149	greg	1.10	fwrite((char *)col, sizeof(COLOR), 1, devout);
150	greg	1.8	putw(xmin, devout);
151			putw(ymin, devout);
152			putw(xmax, devout);
153			putw(ymax, devout);
154	greg	1.12	}
155
156
157	greg	2.6	static void
158	greg	1.12	comm_flush() /* flush output to driver */
159			{
160			putc(COM_FLUSH, devout);
161			fflush(devout);
162	greg	1.13	if (getc(devin) != COM_FLUSH)
163			reply_error("flush");
164	greg	1.17	getstate();
165	greg	1.1	}
166
167
168			static int
169			comm_getcur(xp, yp) /* get and return cursor position */
170			int xp, yp;
171			{
172			int c;
173
174			putc(COM_GETCUR, devout);
175			fflush(devout);
176			if (getc(devin) != COM_GETCUR)
177			reply_error("getcur");
178			c = getc(devin);
179	greg	1.8	*xp = getw(devin);
180			*yp = getw(devin);
181	greg	1.1	return(c);
182			}
183
184
185	greg	2.6	static void
186	greg	1.1	comm_comout(str) /* print string to command line */
187			char *str;
188			{
189			putc(COM_COMOUT, devout);
190			myputs(str, devout);
191	greg	1.18	if (str[strlen(str)-1] == '\n')
192			fflush(devout);
193	greg	1.1	}
194
195
196	greg	2.6	static void
197	greg	1.11	comm_comin(buf, prompt) /* read string from command line */
198	greg	1.1	char *buf;
199	greg	1.11	char *prompt;
200	greg	1.1	{
201			putc(COM_COMIN, devout);
202	greg	1.11	if (prompt == NULL)
203			putc(0, devout);
204			else {
205			putc(1, devout);
206			myputs(prompt, devout);
207			}
208	greg	1.1	fflush(devout);
209			if (getc(devin) != COM_COMIN)
210			reply_error("comin");
211			mygets(buf, devin);
212	greg	1.17	getstate();
213	greg	1.1	}
214
215
216	greg	2.6	static void
217	greg	1.1	mygets(s, fp) /* get string from file (with nul) */
218			register char *s;
219			register FILE *fp;
220			{
221			register int c;
222
223			while ((c = getc(fp)) != EOF)
224			if ((*s++ = c) == '\0')
225			return;
226			*s = '\0';
227			}
228
229
230	greg	2.6	static void
231	greg	1.1	myputs(s, fp) /* put string to file (with nul) */
232			register char *s;
233			register FILE *fp;
234			{
235			do
236			putc(*s, fp);
237			while (*s++);
238			}
239
240
241	greg	2.6	static void
242	greg	1.1	reply_error(routine) /* what should we do here? */
243			char *routine;
244			{
245	gregl	2.5	eputs(routine);
246			eputs(": driver reply error\n");
247	greg	1.1	quit(1);
248	greg	1.17	}
249
250
251	greg	2.6	static void
252	greg	1.17	getstate() /* get driver state variables */
253			{
254			fread((char *)&comm_driver.pixaspect,
255			sizeof(comm_driver.pixaspect), 1, devin);
256			comm_driver.xsiz = getw(devin);
257			comm_driver.ysiz = getw(devin);
258			comm_driver.inpready = getw(devin);
259	greg	1.1	}