1 #include <u.h>
2 #include <libc.h>
3
4 /*
5 * Format:
6 3 r M 4 (0000000000457def 11 00) 8192 512 /rc/lib/rcmain
7 */
8
9 int
iounit(int fd)10 iounit(int fd)
11 {
12 int i, cfd;
13 char buf[128], *args[10];
14
15 snprint(buf, sizeof buf, "#d/%dctl", fd);
16 cfd = open(buf, OREAD);
17 if(cfd < 0)
18 return 0;
19 i = read(cfd, buf, sizeof buf-1);
20 close(cfd);
21 if(i <= 0)
22 return 0;
23 buf[i] = '\0';
24 if(tokenize(buf, args, nelem(args)) != nelem(args))
25 return 0;
26 return atoi(args[7]);
27 }
28