1 /* Licensed under LGPLv2.1+ - see LICENSE file for details */
5 #include <sys/socket.h>
16 /* Set to skip the next plan. */
18 /* The current connection to apply plan to. */
19 struct io_conn *current;
20 /* User-defined function to select which connection(s) to debug. */
21 bool (*io_debug_conn)(struct io_conn *conn);
22 /* Set when we wake up an connection we are debugging. */
25 struct io_plan io_debug(struct io_plan plan)
27 struct io_conn *ready = NULL;
29 if (io_plan_nodebug) {
30 io_plan_nodebug = false;
34 if (!current || !doing_debug_on(current)) {
39 io_debug_wakeup = false;
41 backend_plan_changed(current);
43 /* Call back into the loop immediately. */
44 io_loop_return = do_io_loop(&ready);
48 if (!ready->plan.next) {
49 /* Call finish function immediately. */
51 errno = ready->plan.u.close.saved_errno;
52 ready->finish(ready, ready->finish_arg);
55 backend_del_conn(ready);
57 /* Calls back in itself, via io_debug_io(). */
58 if (ready->plan.io(ready->fd.fd, &ready->plan) != 2)
64 /* Return a do-nothing plan, so backend_plan_changed in
65 * io_ready doesn't do anything (it's already been called). */
69 int io_debug_io(int ret)
71 /* Cache it for debugging; current changes. */
72 struct io_conn *conn = current;
73 int saved_errno = errno;
75 if (!doing_debug_on(conn))
78 /* These will all go linearly through the io_debug() path above. */
81 /* This will call io_debug above. */
85 case 0: /* Keep going with plan. */
88 case 1: /* Done: get next plan. */
89 if (timeout_active(conn))
90 backend_del_timeout(conn);
91 conn->plan.next(conn, conn->plan.next_arg);
97 /* Normally-invalid value, used for sanity check. */
101 static void debug_io_wake(struct io_conn *conn)
103 /* We want linear if we wake a debugged connection, too. */
104 if (io_debug_conn && io_debug_conn(conn))
105 io_debug_wakeup = true;
108 /* Counterpart to io_plan_no_debug(), called in macros in io.h */
109 static void io_plan_debug_again(void)
111 io_plan_nodebug = false;
114 static void debug_io_wake(struct io_conn *conn)
117 static void io_plan_debug_again(void)
122 struct io_listener *io_new_listener_(int fd,
123 void (*init)(int fd, void *arg),
126 struct io_listener *l = malloc(sizeof(*l));
131 l->fd.listener = true;
135 if (!add_listener(l)) {
142 void io_close_listener(struct io_listener *l)
149 struct io_conn *io_new_conn_(int fd, struct io_plan plan)
151 struct io_conn *conn = malloc(sizeof(*conn));
153 io_plan_debug_again();
158 conn->fd.listener = false;
162 conn->finish_arg = NULL;
164 conn->timeout = NULL;
165 if (!add_conn(conn)) {
172 void io_set_finish_(struct io_conn *conn,
173 void (*finish)(struct io_conn *, void *),
176 conn->finish = finish;
177 conn->finish_arg = arg;
180 struct io_conn *io_duplex_(struct io_conn *old, struct io_plan plan)
182 struct io_conn *conn;
184 io_plan_debug_again();
186 assert(!old->duplex);
188 conn = malloc(sizeof(*conn));
192 conn->fd.listener = false;
193 conn->fd.fd = old->fd.fd;
197 conn->finish_arg = NULL;
198 conn->timeout = NULL;
199 if (!add_duplex(conn)) {
207 bool io_timeout_(struct io_conn *conn, struct timespec ts,
208 struct io_plan (*cb)(struct io_conn *, void *), void *arg)
212 if (!conn->timeout) {
213 conn->timeout = malloc(sizeof(*conn->timeout));
217 assert(!timeout_active(conn));
219 conn->timeout->next = cb;
220 conn->timeout->next_arg = arg;
221 backend_add_timeout(conn, ts);
225 /* Returns true if we're finished. */
226 static int do_write(int fd, struct io_plan *plan)
228 ssize_t ret = write(fd, plan->u.write.buf, plan->u.write.len);
230 return io_debug_io(-1);
232 plan->u.write.buf += ret;
233 plan->u.write.len -= ret;
234 return io_debug_io(plan->u.write.len == 0);
237 /* Queue some data to be written. */
238 struct io_plan io_write_(const void *data, size_t len,
239 struct io_plan (*cb)(struct io_conn *, void *),
245 plan.u.write.buf = data;
246 plan.u.write.len = len;
250 plan.pollflag = POLLOUT;
255 static int do_read(int fd, struct io_plan *plan)
257 ssize_t ret = read(fd, plan->u.read.buf, plan->u.read.len);
259 return io_debug_io(-1);
261 plan->u.read.buf += ret;
262 plan->u.read.len -= ret;
263 return io_debug_io(plan->u.read.len == 0);
266 /* Queue a request to read into a buffer. */
267 struct io_plan io_read_(void *data, size_t len,
268 struct io_plan (*cb)(struct io_conn *, void *),
274 plan.u.read.buf = data;
275 plan.u.read.len = len;
279 plan.pollflag = POLLIN;
284 static int do_read_partial(int fd, struct io_plan *plan)
286 ssize_t ret = read(fd, plan->u.readpart.buf, *plan->u.readpart.lenp);
288 return io_debug_io(-1);
290 *plan->u.readpart.lenp = ret;
291 return io_debug_io(1);
294 /* Queue a partial request to read into a buffer. */
295 struct io_plan io_read_partial_(void *data, size_t *len,
296 struct io_plan (*cb)(struct io_conn *, void *),
302 plan.u.readpart.buf = data;
303 plan.u.readpart.lenp = len;
304 plan.io = do_read_partial;
307 plan.pollflag = POLLIN;
312 static int do_write_partial(int fd, struct io_plan *plan)
314 ssize_t ret = write(fd, plan->u.writepart.buf, *plan->u.writepart.lenp);
316 return io_debug_io(-1);
318 *plan->u.writepart.lenp = ret;
319 return io_debug_io(1);
322 /* Queue a partial write request. */
323 struct io_plan io_write_partial_(const void *data, size_t *len,
324 struct io_plan (*cb)(struct io_conn*, void *),
330 plan.u.writepart.buf = data;
331 plan.u.writepart.lenp = len;
332 plan.io = do_write_partial;
335 plan.pollflag = POLLOUT;
340 struct io_plan io_idle_(void)
346 /* Never called (overridden by io_wake), but NULL means closing */
347 plan.next = (void *)io_idle_;
352 void io_wake_(struct io_conn *conn, struct io_plan plan)
355 io_plan_debug_again();
357 /* It might be closing, but we haven't called its finish() yet. */
358 if (!conn->plan.next)
360 /* It was idle, right? */
361 assert(!conn->plan.io);
363 backend_plan_changed(conn);
368 void io_ready(struct io_conn *conn)
371 switch (conn->plan.io(conn->fd.fd, &conn->plan)) {
372 case -1: /* Failure means a new plan: close up. */
373 conn->plan = io_close();
374 backend_plan_changed(conn);
376 case 0: /* Keep going with plan. */
378 case 1: /* Done: get next plan. */
379 if (timeout_active(conn))
380 backend_del_timeout(conn);
381 conn->plan = conn->plan.next(conn, conn->plan.next_arg);
382 backend_plan_changed(conn);
387 /* Close the connection, we're done. */
388 struct io_plan io_close_(void)
393 /* This means we're closing. */
395 plan.u.close.saved_errno = errno;
400 struct io_plan io_close_cb(struct io_conn *conn, void *arg)
405 /* Exit the loop, returning this (non-NULL) arg. */
406 struct io_plan io_break_(void *ret, struct io_plan plan)
408 io_plan_debug_again();
411 io_loop_return = ret;