| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: devcomm.c,v 2.14 2008/05/01 15:50:28 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* devcomm.c - communication routines for separate drivers. |
| 6 |
* |
| 7 |
* External symbols declared in driver.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include <sys/types.h> |
| 13 |
#include <sys/wait.h> /* XXX platform specific */ |
| 14 |
|
| 15 |
#include "platform.h" |
| 16 |
#include "standard.h" |
| 17 |
#include "driver.h" |
| 18 |
|
| 19 |
#ifndef DEVPATH |
| 20 |
#define DEVPATH getenv("PATH") /* device search path */ |
| 21 |
#endif |
| 22 |
|
| 23 |
FILE *devin, *devout; |
| 24 |
int devchild; |
| 25 |
|
| 26 |
static struct driver * final_connect(void); |
| 27 |
static void mygets(char *s, FILE *fp); |
| 28 |
static void myputs(char *s, FILE *fp); |
| 29 |
static void reply_error(char *routine); |
| 30 |
static void getstate(void); |
| 31 |
|
| 32 |
static dr_closef_t comm_close; |
| 33 |
static dr_clearf_t comm_clear; |
| 34 |
static dr_paintrf_t comm_paintr; |
| 35 |
static dr_getcurf_t comm_getcur; |
| 36 |
static dr_comoutf_t comm_comout; |
| 37 |
static dr_cominf_t comm_comin; |
| 38 |
static dr_flushf_t comm_flush; |
| 39 |
|
| 40 |
struct driver comm_driver = { |
| 41 |
comm_close, comm_clear, comm_paintr, comm_getcur, |
| 42 |
comm_comout, comm_comin, comm_flush |
| 43 |
}; |
| 44 |
|
| 45 |
|
| 46 |
static struct driver * |
| 47 |
final_connect(void) /* verify and initialize connection */ |
| 48 |
{ |
| 49 |
putw(COM_SENDM, devout); |
| 50 |
fflush(devout); |
| 51 |
if (getw(devin) != COM_RECVM) |
| 52 |
return(NULL); |
| 53 |
/* get driver parameters */ |
| 54 |
getstate(); |
| 55 |
/* set error vectors */ |
| 56 |
erract[COMMAND].pf = comm_comout; |
| 57 |
/* doesn't work with raypcalls.c |
| 58 |
if (erract[WARNING].pf != NULL) |
| 59 |
erract[WARNING].pf = comm_comout; |
| 60 |
*/ |
| 61 |
return(&comm_driver); |
| 62 |
} |
| 63 |
|
| 64 |
|
| 65 |
extern struct driver * |
| 66 |
slave_init( /* run rview in slave mode */ |
| 67 |
char *dname, |
| 68 |
char *id |
| 69 |
) |
| 70 |
{ |
| 71 |
devchild = -1; /* we're the slave here */ |
| 72 |
devout = stdout; /* use standard input */ |
| 73 |
devin = stdin; /* and standard output */ |
| 74 |
return(final_connect()); /* verify initialization */ |
| 75 |
} |
| 76 |
|
| 77 |
|
| 78 |
extern struct driver * |
| 79 |
comm_init( /* set up and execute driver */ |
| 80 |
char *dname, |
| 81 |
char *id |
| 82 |
) |
| 83 |
{ |
| 84 |
char *dvcname; |
| 85 |
int p1[2], p2[2]; |
| 86 |
char pin[16], pout[16]; |
| 87 |
/* find driver program */ |
| 88 |
if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
| 89 |
eputs(dname); |
| 90 |
eputs(": not found\n"); |
| 91 |
return(NULL); |
| 92 |
} |
| 93 |
#ifdef RHAS_FORK_EXEC |
| 94 |
/* open communication pipes */ |
| 95 |
if (pipe(p1) == -1 || pipe(p2) == -1) |
| 96 |
goto syserr; |
| 97 |
if ((devchild = fork()) == 0) { /* fork driver process */ |
| 98 |
close(p1[1]); |
| 99 |
close(p2[0]); |
| 100 |
sprintf(pin, "%d", p1[0]); |
| 101 |
sprintf(pout, "%d", p2[1]); |
| 102 |
execl(dvcname, dname, pin, pout, id, NULL); |
| 103 |
perror(dvcname); |
| 104 |
_exit(127); |
| 105 |
} |
| 106 |
if (devchild == -1) |
| 107 |
goto syserr; |
| 108 |
close(p1[0]); |
| 109 |
close(p2[1]); |
| 110 |
/* |
| 111 |
* Close write stream on exec to avoid multiprocessing deadlock. |
| 112 |
* No use in read stream without it, so set flag there as well. |
| 113 |
*/ |
| 114 |
fcntl(p1[1], F_SETFD, FD_CLOEXEC); |
| 115 |
fcntl(p2[0], F_SETFD, FD_CLOEXEC); |
| 116 |
if ((devout = fdopen(p1[1], "w")) == NULL) |
| 117 |
goto syserr; |
| 118 |
if ((devin = fdopen(p2[0], "r")) == NULL) |
| 119 |
goto syserr; |
| 120 |
return(final_connect()); /* verify initialization */ |
| 121 |
syserr: |
| 122 |
perror(dname); |
| 123 |
return(NULL); |
| 124 |
|
| 125 |
#else /* ! RHAS_FORK_EXEC */ |
| 126 |
|
| 127 |
eputs(dname); |
| 128 |
eputs(": no fork/exec\n"); |
| 129 |
return(NULL); |
| 130 |
|
| 131 |
#endif /* ! RHAS_FORK_EXEC */ |
| 132 |
} |
| 133 |
|
| 134 |
|
| 135 |
static void |
| 136 |
comm_close(void) /* done with driver */ |
| 137 |
{ |
| 138 |
int pid; |
| 139 |
|
| 140 |
erract[COMMAND].pf = NULL; /* reset error vectors */ |
| 141 |
if (erract[WARNING].pf != NULL) |
| 142 |
erract[WARNING].pf = wputs; |
| 143 |
fclose(devout); |
| 144 |
fclose(devin); |
| 145 |
if (devchild < 0) |
| 146 |
return; |
| 147 |
while ((pid = wait(0)) != -1 && pid != devchild) |
| 148 |
; |
| 149 |
} |
| 150 |
|
| 151 |
|
| 152 |
static void |
| 153 |
comm_clear( /* clear screen */ |
| 154 |
int xres, |
| 155 |
int yres |
| 156 |
) |
| 157 |
{ |
| 158 |
putc(COM_CLEAR, devout); |
| 159 |
putw(xres, devout); |
| 160 |
putw(yres, devout); |
| 161 |
fflush(devout); |
| 162 |
} |
| 163 |
|
| 164 |
|
| 165 |
static void |
| 166 |
comm_paintr( /* paint a rectangle */ |
| 167 |
COLOR col, |
| 168 |
int xmin, |
| 169 |
int ymin, |
| 170 |
int xmax, |
| 171 |
int ymax |
| 172 |
) |
| 173 |
{ |
| 174 |
putc(COM_PAINTR, devout); |
| 175 |
fwrite((char *)col, sizeof(COLOR), 1, devout); |
| 176 |
putw(xmin, devout); |
| 177 |
putw(ymin, devout); |
| 178 |
putw(xmax, devout); |
| 179 |
putw(ymax, devout); |
| 180 |
} |
| 181 |
|
| 182 |
|
| 183 |
static void |
| 184 |
comm_flush(void) /* flush output to driver */ |
| 185 |
{ |
| 186 |
putc(COM_FLUSH, devout); |
| 187 |
fflush(devout); |
| 188 |
if (getc(devin) != COM_FLUSH) |
| 189 |
reply_error("flush"); |
| 190 |
getstate(); |
| 191 |
} |
| 192 |
|
| 193 |
|
| 194 |
static int |
| 195 |
comm_getcur( /* get and return cursor position */ |
| 196 |
int *xp, |
| 197 |
int *yp |
| 198 |
) |
| 199 |
{ |
| 200 |
int c; |
| 201 |
|
| 202 |
putc(COM_GETCUR, devout); |
| 203 |
fflush(devout); |
| 204 |
if (getc(devin) != COM_GETCUR) |
| 205 |
reply_error("getcur"); |
| 206 |
c = getc(devin); |
| 207 |
*xp = getw(devin); |
| 208 |
*yp = getw(devin); |
| 209 |
return(c); |
| 210 |
} |
| 211 |
|
| 212 |
|
| 213 |
static void |
| 214 |
comm_comout( /* print string to command line */ |
| 215 |
char *str |
| 216 |
) |
| 217 |
{ |
| 218 |
putc(COM_COMOUT, devout); |
| 219 |
myputs(str, devout); |
| 220 |
if (str[strlen(str)-1] == '\n') |
| 221 |
fflush(devout); |
| 222 |
} |
| 223 |
|
| 224 |
|
| 225 |
static void |
| 226 |
comm_comin( /* read string from command line */ |
| 227 |
char *buf, |
| 228 |
char *prompt |
| 229 |
) |
| 230 |
{ |
| 231 |
putc(COM_COMIN, devout); |
| 232 |
if (prompt == NULL) |
| 233 |
putc(0, devout); |
| 234 |
else { |
| 235 |
putc(1, devout); |
| 236 |
myputs(prompt, devout); |
| 237 |
} |
| 238 |
fflush(devout); |
| 239 |
if (getc(devin) != COM_COMIN) |
| 240 |
reply_error("comin"); |
| 241 |
mygets(buf, devin); |
| 242 |
getstate(); |
| 243 |
} |
| 244 |
|
| 245 |
|
| 246 |
static void |
| 247 |
mygets( /* get string from file (with nul) */ |
| 248 |
register char *s, |
| 249 |
register FILE *fp |
| 250 |
) |
| 251 |
{ |
| 252 |
register int c; |
| 253 |
|
| 254 |
while ((c = getc(fp)) != EOF) |
| 255 |
if ((*s++ = c) == '\0') |
| 256 |
return; |
| 257 |
*s = '\0'; |
| 258 |
} |
| 259 |
|
| 260 |
|
| 261 |
static void |
| 262 |
myputs( /* put string to file (with nul) */ |
| 263 |
register char *s, |
| 264 |
register FILE *fp |
| 265 |
) |
| 266 |
{ |
| 267 |
do |
| 268 |
putc(*s, fp); |
| 269 |
while (*s++); |
| 270 |
} |
| 271 |
|
| 272 |
|
| 273 |
static void |
| 274 |
reply_error( /* what should we do here? */ |
| 275 |
char *routine |
| 276 |
) |
| 277 |
{ |
| 278 |
eputs(routine); |
| 279 |
eputs(": driver reply error\n"); |
| 280 |
quit(1); |
| 281 |
} |
| 282 |
|
| 283 |
|
| 284 |
static void |
| 285 |
getstate(void) /* get driver state variables */ |
| 286 |
{ |
| 287 |
fread((char *)&comm_driver.pixaspect, |
| 288 |
sizeof(comm_driver.pixaspect), 1, devin); |
| 289 |
comm_driver.xsiz = getw(devin); |
| 290 |
comm_driver.ysiz = getw(devin); |
| 291 |
comm_driver.inpready = getw(devin); |
| 292 |
} |
