blob: 7b12e0edd258c998d8cd8842efc4b60fce3feb14 [file] [log] [blame]
/* vi: set sw=4 ts=4: */
* Generic non-forking server infrastructure.
* Intended to make writing telnetd-type servers easier.
* Copyright (C) 2007 Denys Vlasenko
* Licensed under GPLv2, see file LICENSE in this source tree.
/* opaque structure */
struct isrv_state_t;
typedef struct isrv_state_t isrv_state_t;
/* callbacks */
void isrv_want_rd(isrv_state_t *state, int fd);
void isrv_want_wr(isrv_state_t *state, int fd);
void isrv_dont_want_rd(isrv_state_t *state, int fd);
void isrv_dont_want_wr(isrv_state_t *state, int fd);
int isrv_register_fd(isrv_state_t *state, int peer, int fd);
void isrv_close_fd(isrv_state_t *state, int fd);
int isrv_register_peer(isrv_state_t *state, void *param);
/* Driver:
* Select on listen_fd for <linger_timeout> (or forever if 0).
* If we time out and we have no peers, exit.
* If we have peers, call do_timeout(peer_param),
* if it returns !0, peer is removed.
* If listen_fd is active, accept new connection ("peer"),
* call new_peer() on it, and if it returns 0,
* add it to fds to select on.
* Now, select will wait for <timeout>, not <linger_timeout>
* (as long as we have more than zero peers).
* If a peer's fd is active, we call do_rd() on it if read
* bit was set, and then do_wr() if write bit was also set.
* If either returns !0, peer is removed.
* Reaching this place also resets timeout counter for this peer.
* Note that peer must indicate that he wants to be selected
* for read and/or write using isrv_want_rd()/isrv_want_wr()
* [can be called in new_peer() or in do_rd()/do_wr()].
* If it never wants to be selected for write, do_wr()
* will never be called (can be NULL).
void isrv_run(
int listen_fd,
int (*new_peer)(isrv_state_t *state, int fd),
int (*do_rd)(int fd, void **),
int (*do_wr)(int fd, void **),
int (*do_timeout)(void **),
int timeout,
int linger_timeout