| 16 |
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| 17 |
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#include "driver.h" |
| 18 |
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| 19 |
+ |
#include "vfork.h" |
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|
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#ifndef DEVPATH |
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#define DEVPATH getenv("PATH") /* device search path */ |
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#endif |
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| 25 |
< |
#ifndef DELAY |
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< |
#define DELAY 20 /* seconds to wait for response */ |
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< |
#endif |
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< |
|
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< |
#ifndef BSD |
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< |
#define vfork fork |
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< |
#endif |
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< |
|
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< |
extern char *getpath(), *getenv(); |
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< |
|
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< |
static int comm_close(), comm_clear(), comm_paintr(), comm_errout(), |
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> |
static int comm_close(), comm_clear(), comm_paintr(), |
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comm_getcur(), comm_comout(), comm_comin(), comm_flush(); |
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struct driver comm_driver = { |
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int devchild; |
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static struct driver * |
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final_connect() /* verify and initialize connection */ |
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{ |
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putw(COM_SENDM, devout); |
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fflush(devout); |
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if (getw(devin) != COM_RECVM) |
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return(NULL); |
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/* get driver parameters */ |
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getstate(); |
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+ |
/* set error vectors */ |
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+ |
cmdvec = comm_comout; |
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+ |
if (wrnvec != NULL) |
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+ |
wrnvec = comm_comout; |
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+ |
return(&comm_driver); |
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+ |
} |
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+ |
|
| 54 |
+ |
|
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struct driver * |
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+ |
slave_init(dname, id) /* run rview in slave mode */ |
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+ |
char *dname, *id; |
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+ |
{ |
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+ |
devchild = -1; /* we're the slave here */ |
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+ |
devout = stdout; /* use standard input */ |
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+ |
devin = stdin; /* and standard output */ |
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+ |
return(final_connect()); /* verify initialization */ |
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+ |
} |
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+ |
|
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+ |
|
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+ |
struct driver * |
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comm_init(dname, id) /* set up and execute driver */ |
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char *dname, *id; |
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{ |
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int p1[2], p2[2]; |
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char pin[16], pout[16]; |
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/* find driver program */ |
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< |
if ((devname = getpath(dname, DEVPATH, 1)) == NULL) { |
| 74 |
> |
if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
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stderr_v(dname); |
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stderr_v(": not found\n"); |
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return(NULL); |
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goto syserr; |
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if ((devin = fdopen(p2[0], "r")) == NULL) |
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goto syserr; |
| 99 |
< |
/* verify initialization */ |
| 80 |
< |
putw(COM_SENDM, devout); |
| 81 |
< |
fflush(devout); |
| 82 |
< |
if (getw(devin) != COM_RECVM) |
| 83 |
< |
return(NULL); |
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< |
/* get driver parameters */ |
| 85 |
< |
getstate(); |
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< |
/* set error vectors */ |
| 87 |
< |
cmdvec = comm_comout; |
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< |
if (wrnvec != NULL) |
| 89 |
< |
wrnvec = comm_comout; |
| 90 |
< |
return(&comm_driver); |
| 99 |
> |
return(final_connect()); /* verify initialization */ |
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syserr: |
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perror(dname); |
| 102 |
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return(NULL); |
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wrnvec = stderr_v; |
| 114 |
|
fclose(devout); |
| 115 |
|
fclose(devin); |
| 116 |
+ |
if (devchild < 0) |
| 117 |
+ |
return; |
| 118 |
|
while ((pid = wait(0)) != -1 && pid != devchild) |
| 119 |
|
; |
| 120 |
|
} |
| 201 |
|
reply_error("comin"); |
| 202 |
|
mygets(buf, devin); |
| 203 |
|
getstate(); |
| 193 |
– |
} |
| 194 |
– |
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| 195 |
– |
|
| 196 |
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static |
| 197 |
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comm_errout(str) /* display an error message */ |
| 198 |
– |
char *str; |
| 199 |
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{ |
| 200 |
– |
comm_comout(str); |
| 201 |
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stderr_v(str); /* send to standard error also */ |
| 204 |
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} |
| 205 |
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