1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
#include <u.h>
#include <libc.h>
/*
* query the connection server
*/
char*
csquery(char *attr, char *val, char *rattr)
{
char token[64 + 4], buf[256], *p, *sp;
int fd, n;
if(val == nil || val[0] == 0)
return nil;
fd = open("/net/cs", ORDWR);
if(fd < 0)
return nil;
fprint(fd, "!%s=%s", attr, val);
seek(fd, 0, 0);
snprint(token, sizeof token, "%s=", rattr);
for(;;){
n = read(fd, buf, sizeof buf - 1);
if(n <= 0)
break;
buf[n] = 0;
p = strstr(buf, token);
if(p != nil && (p == buf || p[-1] == 0)){
close(fd);
sp = strchr(p, ' ');
if(sp)
*sp = 0;
p = strchr(p, '=');
if(p == nil)
return nil;
return strdup(p + 1);
}
}
close(fd);
return nil;
}
|
