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1 | Overview of the filedescriptor subsystem | |
2 | Adrian Chadd <adrian@creative.net.au> | |
3 | ||
4 | ||
5 | ||
6 | Filedescriptor lists | |
7 | -------------------- | |
8 | ||
9 | The filedescriptor list is managed through the routines in fdlist.c . | |
10 | These include: | |
11 | ||
12 | fd_open() - tag an FD as "open" and active | |
13 | fd_close() - tag an FD as "closed" and close() the filedescriptor | |
14 | fd_note() - update the filedescriptor tag | |
15 | ||
16 | You can get the current list of open filedescriptors through /stats F as | |
17 | an oper. | |
18 | ||
19 | ||
20 | ||
21 | FD lists | |
22 | -------- | |
23 | ||
24 | The FD list support is very alpha. There are a few lists defined: | |
25 | ||
26 | typedef enum fdlist_t { | |
27 | FDLIST_NONE, | |
28 | FDLIST_SERVICE, | |
29 | FDLIST_SERVER, | |
30 | FDLIST_IDLECLIENT, | |
31 | FDLIST_BUSYCLIENT, | |
32 | FDLIST_MAX | |
33 | } fdlist_t; | |
34 | ||
35 | FDLIST_NONE Not on any list (ie close()d) | |
36 | FDLIST_SERVICE A service - listen() sockets, resolver, etc | |
37 | FDLIST_SERVER Server connections | |
38 | FDLIST_IDLECLIENT An idle client | |
39 | FDLIST_BUSYCLIENT A busy client | |
40 | FDLIST_MAX Used for bounds checking | |
41 | ||
42 | The idea is that the SERVICE sockets need polling frequently, the SERVER | |
43 | sockets also need polling frequently, BUSYCLIENT is for busy clients | |
44 | which need frequent polling (eg we're trying to write to them), and | |
45 | IDLECLIENT is for clients which we don't need to poll frequently. | |
46 | THIS hasn't been decided upon yet. |