src/rt/devcomm.c

#ifndef lint
static const char       RCSid[] = "$Id: devcomm.c,v 2.9 2003/07/03 15:00:19 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 "paths.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 = 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);

#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:	2.10
Committed:	Mon Nov 10 16:52:25 2003 UTC (21 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.9:	+3 -5 lines
Log Message:	Eliminated fork() redeclaration and vfork.h
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.10	static const char RCSid[] = "$Id: devcomm.c,v 2.9 2003/07/03 15:00:19 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	greg	2.10	#include "paths.h"
17	greg	1.1
18			#include "driver.h"
19	greg	2.2
20	greg	1.1	#ifndef DEVPATH
21			#define DEVPATH getenv("PATH") /* device search path */
22			#endif
23
24	greg	2.6	static int comm_getcur();
25			static void comm_close(), comm_clear(), comm_paintr(),
26			comm_comin(), comm_comout(), comm_flush();
27	greg	1.1
28	greg	1.12	struct driver comm_driver = {
29	greg	1.1	comm_close, comm_clear, comm_paintr, comm_getcur,
30	greg	1.12	comm_comout, comm_comin, comm_flush
31	greg	1.1	};
32
33	greg	2.6	static void mygets(), myputs(), reply_error(), getstate();
34	greg	2.4
35	greg	1.1	FILE devin, devout;
36
37			int devchild;
38
39
40	greg	2.3	static struct driver *
41			final_connect() /* verify and initialize connection */
42			{
43			putw(COM_SENDM, devout);
44			fflush(devout);
45			if (getw(devin) != COM_RECVM)
46			return(NULL);
47			/* get driver parameters */
48			getstate();
49			/* set error vectors */
50	gregl	2.5	erract[COMMAND].pf = comm_comout;
51			if (erract[WARNING].pf != NULL)
52			erract[WARNING].pf = comm_comout;
53	greg	2.3	return(&comm_driver);
54			}
55
56
57	greg	1.1	struct driver *
58	greg	2.3	slave_init(dname, id) /* run rview in slave mode */
59			char dname, id;
60			{
61			devchild = -1; /* we're the slave here */
62			devout = stdout; /* use standard input */
63			devin = stdin; /* and standard output */
64			return(final_connect()); /* verify initialization */
65			}
66
67
68			struct driver *
69	greg	1.7	comm_init(dname, id) /* set up and execute driver */
70			char dname, id;
71	greg	1.1	{
72	greg	2.6	char *dvcname;
73	greg	1.1	int p1[2], p2[2];
74	greg	1.7	char pin[16], pout[16];
75			/* find driver program */
76	greg	2.6	if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) {
77	gregl	2.5	eputs(dname);
78			eputs(": not found\n");
79	greg	1.1	return(NULL);
80			}
81	greg	2.8	#ifdef RHAS_FORK_EXEC
82	greg	1.7	/* open communication pipes */
83	greg	1.1	if (pipe(p1) == -1 \|\| pipe(p2) == -1)
84			goto syserr;
85	greg	1.7	if ((devchild = vfork()) == 0) { /* fork driver process */
86	greg	1.1	close(p1[1]);
87			close(p2[0]);
88	greg	1.7	sprintf(pin, "%d", p1[0]);
89			sprintf(pout, "%d", p2[1]);
90	greg	2.6	execl(dvcname, dname, pin, pout, id, 0);
91			perror(dvcname);
92	greg	1.1	_exit(127);
93			}
94			if (devchild == -1)
95			goto syserr;
96			close(p1[0]);
97			close(p2[1]);
98			if ((devout = fdopen(p1[1], "w")) == NULL)
99			goto syserr;
100			if ((devin = fdopen(p2[0], "r")) == NULL)
101			goto syserr;
102	greg	2.3	return(final_connect()); /* verify initialization */
103	greg	1.1	syserr:
104	greg	1.7	perror(dname);
105	greg	1.1	return(NULL);
106	greg	2.8
107			#else /* ! RHAS_FORK_EXEC */
108
109			eputs(dname);
110			eputs(": no fork/exec\n");
111			return(NULL);
112
113			#endif /* ! RHAS_FORK_EXEC */
114	greg	1.1	}
115
116
117	greg	2.6	static void
118	greg	1.1	comm_close() /* done with driver */
119			{
120			int pid;
121
122	gregl	2.5	erract[COMMAND].pf = NULL; /* reset error vectors */
123			if (erract[WARNING].pf != NULL)
124			erract[WARNING].pf = wputs;
125	greg	1.1	fclose(devout);
126			fclose(devin);
127	greg	2.3	if (devchild < 0)
128			return;
129	greg	1.1	while ((pid = wait(0)) != -1 && pid != devchild)
130			;
131			}
132
133
134	greg	2.6	static void
135	greg	1.1	comm_clear(xres, yres) /* clear screen */
136			int xres, yres;
137			{
138			putc(COM_CLEAR, devout);
139	greg	1.8	putw(xres, devout);
140			putw(yres, devout);
141	greg	1.1	fflush(devout);
142			}
143
144
145	greg	2.6	static void
146	greg	1.1	comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
147			COLOR col;
148			int xmin, ymin, xmax, ymax;
149			{
150			putc(COM_PAINTR, devout);
151	greg	1.10	fwrite((char *)col, sizeof(COLOR), 1, devout);
152	greg	1.8	putw(xmin, devout);
153			putw(ymin, devout);
154			putw(xmax, devout);
155			putw(ymax, devout);
156	greg	1.12	}
157
158
159	greg	2.6	static void
160	greg	1.12	comm_flush() /* flush output to driver */
161			{
162			putc(COM_FLUSH, devout);
163			fflush(devout);
164	greg	1.13	if (getc(devin) != COM_FLUSH)
165			reply_error("flush");
166	greg	1.17	getstate();
167	greg	1.1	}
168
169
170			static int
171			comm_getcur(xp, yp) /* get and return cursor position */
172			int xp, yp;
173			{
174			int c;
175
176			putc(COM_GETCUR, devout);
177			fflush(devout);
178			if (getc(devin) != COM_GETCUR)
179			reply_error("getcur");
180			c = getc(devin);
181	greg	1.8	*xp = getw(devin);
182			*yp = getw(devin);
183	greg	1.1	return(c);
184			}
185
186
187	greg	2.6	static void
188	greg	1.1	comm_comout(str) /* print string to command line */
189			char *str;
190			{
191			putc(COM_COMOUT, devout);
192			myputs(str, devout);
193	greg	1.18	if (str[strlen(str)-1] == '\n')
194			fflush(devout);
195	greg	1.1	}
196
197
198	greg	2.6	static void
199	greg	1.11	comm_comin(buf, prompt) /* read string from command line */
200	greg	1.1	char *buf;
201	greg	1.11	char *prompt;
202	greg	1.1	{
203			putc(COM_COMIN, devout);
204	greg	1.11	if (prompt == NULL)
205			putc(0, devout);
206			else {
207			putc(1, devout);
208			myputs(prompt, devout);
209			}
210	greg	1.1	fflush(devout);
211			if (getc(devin) != COM_COMIN)
212			reply_error("comin");
213			mygets(buf, devin);
214	greg	1.17	getstate();
215	greg	1.1	}
216
217
218	greg	2.6	static void
219	greg	1.1	mygets(s, fp) /* get string from file (with nul) */
220			register char *s;
221			register FILE *fp;
222			{
223			register int c;
224
225			while ((c = getc(fp)) != EOF)
226			if ((*s++ = c) == '\0')
227			return;
228			*s = '\0';
229			}
230
231
232	greg	2.6	static void
233	greg	1.1	myputs(s, fp) /* put string to file (with nul) */
234			register char *s;
235			register FILE *fp;
236			{
237			do
238			putc(*s, fp);
239			while (*s++);
240			}
241
242
243	greg	2.6	static void
244	greg	1.1	reply_error(routine) /* what should we do here? */
245			char *routine;
246			{
247	gregl	2.5	eputs(routine);
248			eputs(": driver reply error\n");
249	greg	1.1	quit(1);
250	greg	1.17	}
251
252
253	greg	2.6	static void
254	greg	1.17	getstate() /* get driver state variables */
255			{
256			fread((char *)&comm_driver.pixaspect,
257			sizeof(comm_driver.pixaspect), 1, devin);
258			comm_driver.xsiz = getw(devin);
259			comm_driver.ysiz = getw(devin);
260			comm_driver.inpready = getw(devin);
261	greg	1.1	}