tcsipinfo.c - plan9port - [fork] Plan 9 from user space
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       ---
       tcsipinfo.c (1174B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bio.h>
            4 #include <ndb.h>
            5 #include <ndbhf.h>
            6 
            7 /*
            8  *  look up the ip attributes 'list' for an entry that has the
            9  *  given 'attr=val' and a 'ip=' tuples.
           10  *
           11  *  return nil if not found.
           12  */
           13 Ndbtuple*
           14 csipinfo(char *netroot, char *attr, char *val, char **list, int n)
           15 {
           16         Ndbtuple *t, *first, *last;
           17         int i;
           18         char line[1024];
           19         int fd;
           20         char *p, *e;
           21 
           22         if(netroot)
           23                 snprint(line, sizeof(line), "%s/cs", netroot);
           24         else
           25                 strcpy(line, "/net/cs");
           26         fd = open(line, ORDWR);
           27         if(fd < 0)
           28                 return 0;
           29         seek(fd, 0, 0);
           30         e = line + sizeof(line);
           31         p = seprint(line, e, "!ipinfo %s=%s", attr, val);
           32         for(i = 0; i < n; i++){
           33                 if(*list == nil)
           34                         break;
           35                 p = seprint(p, e, " %s", *list++);
           36         }
           37 
           38         if(write(fd, line, strlen(line)) < 0){
           39                 close(fd);
           40                 return 0;
           41         }
           42         seek(fd, 0, 0);
           43 
           44         first = last = 0;
           45         for(;;){
           46                 n = read(fd, line, sizeof(line)-2);
           47                 if(n <= 0)
           48                         break;
           49                 line[n] = '\n';
           50                 line[n+1] = 0;
           51 
           52                 t = _ndbparseline(line);
           53                 if(t == 0)
           54                         continue;
           55                 if(first)
           56                         last->entry = t;
           57                 else
           58                         first = t;
           59                 last = t;
           60 
           61                 while(last->entry)
           62                         last = last->entry;
           63         }
           64         close(fd);
           65 
           66         setmalloctag(first, getcallerpc(&netroot));
           67         return first;
           68 }