#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
+#include <ccan/container_of/container_of.h>
void *io_loop_return;
-struct io_alloc io_alloc = {
- malloc, realloc, free
-};
+struct io_plan io_conn_freed;
-#ifdef DEBUG
-/* Set to skip the next plan. */
-bool io_plan_nodebug;
-/* The current connection to apply plan to. */
-struct io_conn *current;
-/* User-defined function to select which connection(s) to debug. */
-bool (*io_debug_conn)(struct io_conn *conn);
-
-struct io_plan io_debug(struct io_plan plan)
+struct io_listener *io_new_listener_(const tal_t *ctx, int fd,
+ struct io_plan *(*init)(struct io_conn *,
+ void *),
+ void *arg)
{
- struct io_conn *ready = NULL;
+ struct io_listener *l = tal(ctx, struct io_listener);
+ if (!l)
+ return NULL;
- if (io_plan_nodebug) {
- io_plan_nodebug = false;
- return plan;
- }
+ l->fd.listener = true;
+ l->fd.fd = fd;
+ l->init = init;
+ l->arg = arg;
+ l->ctx = ctx;
+ if (!add_listener(l))
+ return tal_free(l);
+ return l;
+}
- if (!current || !doing_debug_on(current))
- return plan;
-
- current->plan = plan;
- backend_plan_changed(current);
-
- /* Call back into the loop immediately. */
- io_loop_return = do_io_loop(&ready);
-
- if (ready) {
- set_current(ready);
- if (!ready->plan.next) {
- /* Call finish function immediately. */
- if (ready->finish) {
- errno = ready->plan.u1.s;
- ready->finish(ready, ready->finish_arg);
- ready->finish = NULL;
- }
- backend_del_conn(ready);
- } else {
- /* Calls back in itself, via io_debug_io(). */
- if (ready->plan.io(ready->fd.fd, &ready->plan) != 2)
- abort();
- }
- set_current(NULL);
- }
+void io_close_listener(struct io_listener *l)
+{
+ tal_free(l);
+}
- /* Return a do-nothing plan, so backend_plan_changed in
- * io_ready doesn't do anything (it's already been called). */
- return io_wait_(NULL, (void *)1, NULL);
+static struct io_plan *io_never_called(struct io_conn *conn, void *arg)
+{
+ abort();
}
-int io_debug_io(int ret)
+/* Returns false if conn was freed. */
+static bool next_plan(struct io_conn *conn, struct io_plan *plan)
{
- /* Cache it for debugging; current changes. */
- struct io_conn *conn = current;
- int saved_errno = errno;
+ struct io_plan *(*next)(struct io_conn *, void *arg);
- if (!doing_debug_on(conn))
- return ret;
+ next = plan->next;
- /* These will all go linearly through the io_debug() path above. */
- switch (ret) {
- case -1:
- /* This will call io_debug above. */
- errno = saved_errno;
- io_close();
- break;
- case 0: /* Keep going with plan. */
- io_debug(conn->plan);
- break;
- case 1: /* Done: get next plan. */
- if (timeout_active(conn))
- backend_del_timeout(conn);
- /* In case they call io_duplex, clear our poll flags so
- * both sides don't seem to be both doing read or write
- * (See assert(!mask || pfd->events != mask) in poll.c) */
- conn->plan.pollflag = 0;
- conn->plan.next(conn, conn->plan.next_arg);
- break;
- default:
- abort();
- }
+ plan->status = IO_UNSET;
+ plan->io = NULL;
+ plan->next = io_never_called;
- /* Normally-invalid value, used for sanity check. */
- return 2;
-}
+ plan = next(conn, plan->next_arg);
-/* Counterpart to io_plan_no_debug(), called in macros in io.h */
-static void io_plan_debug_again(void)
-{
- io_plan_nodebug = false;
-}
-#else
-static void io_plan_debug_again(void)
-{
+ if (plan == &io_conn_freed)
+ return false;
+
+ /* It should have set a plan inside this conn (or duplex) */
+ assert(plan == &conn->plan[IO_IN]
+ || plan == &conn->plan[IO_OUT]
+ || plan == &conn->plan[2]);
+ assert(conn->plan[IO_IN].status != IO_UNSET
+ || conn->plan[IO_OUT].status != IO_UNSET);
+
+ backend_new_plan(conn);
+ return true;
}
-#endif
-struct io_listener *io_new_listener_(int fd,
- void (*init)(int fd, void *arg),
- void *arg)
+bool io_fd_block(int fd, bool block)
{
- struct io_listener *l = io_alloc.alloc(sizeof(*l));
+ int flags = fcntl(fd, F_GETFL);
- if (!l)
- return NULL;
+ if (flags == -1)
+ return false;
- l->fd.listener = true;
- l->fd.fd = fd;
- l->init = init;
- l->arg = arg;
- if (!add_listener(l)) {
- io_alloc.free(l);
- return NULL;
- }
- return l;
-}
+ if (block)
+ flags &= ~O_NONBLOCK;
+ else
+ flags |= O_NONBLOCK;
-void io_close_listener(struct io_listener *l)
-{
- close(l->fd.fd);
- del_listener(l);
- io_alloc.free(l);
+ return fcntl(fd, F_SETFL, flags) != -1;
}
-struct io_conn *io_new_conn_(int fd, struct io_plan plan)
+struct io_conn *io_new_conn_(const tal_t *ctx, int fd,
+ struct io_plan *(*init)(struct io_conn *, void *),
+ void *arg)
{
- struct io_conn *conn = io_alloc.alloc(sizeof(*conn));
-
- io_plan_debug_again();
+ struct io_conn *conn = tal(ctx, struct io_conn);
if (!conn)
return NULL;
conn->fd.listener = false;
conn->fd.fd = fd;
- conn->plan = plan;
conn->finish = NULL;
conn->finish_arg = NULL;
- conn->duplex = NULL;
- conn->timeout = NULL;
- if (!add_conn(conn)) {
- io_alloc.free(conn);
+ list_node_init(&conn->always);
+
+ if (!add_conn(conn))
+ return tal_free(conn);
+
+ /* Keep our I/O async. */
+ io_fd_block(fd, false);
+
+ /* We start with out doing nothing, and in doing our init. */
+ conn->plan[IO_OUT].status = IO_UNSET;
+
+ conn->plan[IO_IN].next = init;
+ conn->plan[IO_IN].next_arg = arg;
+ if (!next_plan(conn, &conn->plan[IO_IN]))
return NULL;
- }
+
return conn;
}
conn->finish_arg = arg;
}
-struct io_conn *io_duplex_(struct io_conn *old, struct io_plan plan)
+struct io_plan_arg *io_plan_arg(struct io_conn *conn, enum io_direction dir)
{
- struct io_conn *conn;
-
- io_plan_debug_again();
-
- assert(!old->duplex);
+ assert(conn->plan[dir].status == IO_UNSET);
- conn = io_alloc.alloc(sizeof(*conn));
- if (!conn)
- return NULL;
-
- conn->fd.listener = false;
- conn->fd.fd = old->fd.fd;
- conn->plan = plan;
- conn->duplex = old;
- conn->finish = NULL;
- conn->finish_arg = NULL;
- conn->timeout = NULL;
- if (!add_duplex(conn)) {
- io_alloc.free(conn);
- return NULL;
- }
- old->duplex = conn;
- return conn;
+ conn->plan[dir].status = IO_POLLING;
+ return &conn->plan[dir].arg;
}
-bool io_timeout_(struct io_conn *conn, struct timespec ts,
- struct io_plan (*cb)(struct io_conn *, void *), void *arg)
+static struct io_plan *set_always(struct io_conn *conn,
+ enum io_direction dir,
+ struct io_plan *(*next)(struct io_conn *,
+ void *),
+ void *arg)
{
- assert(cb);
+ struct io_plan *plan = &conn->plan[dir];
- if (!conn->timeout) {
- conn->timeout = io_alloc.alloc(sizeof(*conn->timeout));
- if (!conn->timeout)
- return false;
- } else
- assert(!timeout_active(conn));
-
- conn->timeout->next = cb;
- conn->timeout->next_arg = arg;
- backend_add_timeout(conn, ts);
- return true;
+ plan->status = IO_ALWAYS;
+ backend_new_always(conn);
+ return io_set_plan(conn, dir, NULL, next, arg);
}
-/* Always done: call the next thing. */
-static int do_always(int fd, struct io_plan *plan)
+static struct io_plan *io_always_dir(struct io_conn *conn,
+ enum io_direction dir,
+ struct io_plan *(*next)(struct io_conn *,
+ void *),
+ void *arg)
{
- return 1;
+ return set_always(conn, dir, next, arg);
}
-struct io_plan io_always_(struct io_plan (*cb)(struct io_conn *, void *),
- void *arg)
+struct io_plan *io_always_(struct io_conn *conn,
+ struct io_plan *(*next)(struct io_conn *, void *),
+ void *arg)
{
- struct io_plan plan;
-
- assert(cb);
- plan.io = do_always;
- plan.next = cb;
- plan.next_arg = arg;
- plan.pollflag = POLLALWAYS;
+ return io_always_dir(conn, IO_IN, next, arg);
+}
- return plan;
+struct io_plan *io_out_always_(struct io_conn *conn,
+ struct io_plan *(*next)(struct io_conn *,
+ void *),
+ void *arg)
+{
+ return io_always_dir(conn, IO_OUT, next, arg);
}
-/* Returns true if we're finished. */
-static int do_write(int fd, struct io_plan *plan)
+static int do_write(int fd, struct io_plan_arg *arg)
{
- ssize_t ret = write(fd, plan->u1.cp, plan->u2.s);
+ ssize_t ret = write(fd, arg->u1.cp, arg->u2.s);
if (ret < 0)
- return io_debug_io(-1);
+ return -1;
- plan->u1.cp += ret;
- plan->u2.s -= ret;
- return io_debug_io(plan->u2.s == 0);
+ arg->u1.cp += ret;
+ arg->u2.s -= ret;
+ return arg->u2.s == 0;
}
/* Queue some data to be written. */
-struct io_plan io_write_(const void *data, size_t len,
- struct io_plan (*cb)(struct io_conn *, void *),
- void *arg)
+struct io_plan *io_write_(struct io_conn *conn, const void *data, size_t len,
+ struct io_plan *(*next)(struct io_conn *, void *),
+ void *next_arg)
{
- struct io_plan plan;
-
- assert(cb);
+ struct io_plan_arg *arg = io_plan_arg(conn, IO_OUT);
if (len == 0)
- return io_always_(cb, arg);
+ return set_always(conn, IO_OUT, next, next_arg);
- plan.u1.const_vp = data;
- plan.u2.s = len;
- plan.io = do_write;
- plan.next = cb;
- plan.next_arg = arg;
- plan.pollflag = POLLOUT;
+ arg->u1.const_vp = data;
+ arg->u2.s = len;
- return plan;
+ return io_set_plan(conn, IO_OUT, do_write, next, next_arg);
}
-static int do_read(int fd, struct io_plan *plan)
+static int do_read(int fd, struct io_plan_arg *arg)
{
- ssize_t ret = read(fd, plan->u1.cp, plan->u2.s);
+ ssize_t ret = read(fd, arg->u1.cp, arg->u2.s);
if (ret <= 0)
- return io_debug_io(-1);
+ return -1;
- plan->u1.cp += ret;
- plan->u2.s -= ret;
- return io_debug_io(plan->u2.s == 0);
+ arg->u1.cp += ret;
+ arg->u2.s -= ret;
+ return arg->u2.s == 0;
}
/* Queue a request to read into a buffer. */
-struct io_plan io_read_(void *data, size_t len,
- struct io_plan (*cb)(struct io_conn *, void *),
- void *arg)
+struct io_plan *io_read_(struct io_conn *conn,
+ void *data, size_t len,
+ struct io_plan *(*next)(struct io_conn *, void *),
+ void *next_arg)
{
- struct io_plan plan;
-
- assert(cb);
+ struct io_plan_arg *arg = io_plan_arg(conn, IO_IN);
if (len == 0)
- return io_always_(cb, arg);
-
- plan.u1.cp = data;
- plan.u2.s = len;
- plan.io = do_read;
- plan.next = cb;
- plan.next_arg = arg;
+ return set_always(conn, IO_IN, next, next_arg);
- plan.pollflag = POLLIN;
+ arg->u1.cp = data;
+ arg->u2.s = len;
- return plan;
+ return io_set_plan(conn, IO_IN, do_read, next, next_arg);
}
-static int do_read_partial(int fd, struct io_plan *plan)
+static int do_read_partial(int fd, struct io_plan_arg *arg)
{
- ssize_t ret = read(fd, plan->u1.cp, *(size_t *)plan->u2.vp);
+ ssize_t ret = read(fd, arg->u1.cp, *(size_t *)arg->u2.vp);
if (ret <= 0)
- return io_debug_io(-1);
+ return -1;
- *(size_t *)plan->u2.vp = ret;
- return io_debug_io(1);
+ *(size_t *)arg->u2.vp = ret;
+ return 1;
}
/* Queue a partial request to read into a buffer. */
-struct io_plan io_read_partial_(void *data, size_t *len,
- struct io_plan (*cb)(struct io_conn *, void *),
- void *arg)
+struct io_plan *io_read_partial_(struct io_conn *conn,
+ void *data, size_t maxlen, size_t *len,
+ struct io_plan *(*next)(struct io_conn *,
+ void *),
+ void *next_arg)
{
- struct io_plan plan;
+ struct io_plan_arg *arg = io_plan_arg(conn, IO_IN);
- assert(cb);
+ if (maxlen == 0)
+ return set_always(conn, IO_IN, next, next_arg);
- if (*len == 0)
- return io_always_(cb, arg);
+ arg->u1.cp = data;
+ /* We store the max len in here temporarily. */
+ *len = maxlen;
+ arg->u2.vp = len;
- plan.u1.cp = data;
- plan.u2.vp = len;
- plan.io = do_read_partial;
- plan.next = cb;
- plan.next_arg = arg;
- plan.pollflag = POLLIN;
-
- return plan;
+ return io_set_plan(conn, IO_IN, do_read_partial, next, next_arg);
}
-static int do_write_partial(int fd, struct io_plan *plan)
+static int do_write_partial(int fd, struct io_plan_arg *arg)
{
- ssize_t ret = write(fd, plan->u1.cp, *(size_t *)plan->u2.vp);
+ ssize_t ret = write(fd, arg->u1.cp, *(size_t *)arg->u2.vp);
if (ret < 0)
- return io_debug_io(-1);
+ return -1;
- *(size_t *)plan->u2.vp = ret;
- return io_debug_io(1);
+ *(size_t *)arg->u2.vp = ret;
+ return 1;
}
/* Queue a partial write request. */
-struct io_plan io_write_partial_(const void *data, size_t *len,
- struct io_plan (*cb)(struct io_conn*, void *),
- void *arg)
+struct io_plan *io_write_partial_(struct io_conn *conn,
+ const void *data, size_t maxlen, size_t *len,
+ struct io_plan *(*next)(struct io_conn *,
+ void*),
+ void *next_arg)
{
- struct io_plan plan;
-
- assert(cb);
+ struct io_plan_arg *arg = io_plan_arg(conn, IO_OUT);
- if (*len == 0)
- return io_always_(cb, arg);
+ if (maxlen == 0)
+ return set_always(conn, IO_OUT, next, next_arg);
- plan.u1.const_vp = data;
- plan.u2.vp = len;
- plan.io = do_write_partial;
- plan.next = cb;
- plan.next_arg = arg;
- plan.pollflag = POLLOUT;
+ arg->u1.const_vp = data;
+ /* We store the max len in here temporarily. */
+ *len = maxlen;
+ arg->u2.vp = len;
- return plan;
+ return io_set_plan(conn, IO_OUT, do_write_partial, next, next_arg);
}
-static int already_connected(int fd, struct io_plan *plan)
-{
- return io_debug_io(1);
-}
-
-static int do_connect(int fd, struct io_plan *plan)
+static int do_connect(int fd, struct io_plan_arg *arg)
{
int err, ret;
socklen_t len = sizeof(err);
return -1;
if (err == 0) {
- /* Restore blocking if it was initially. */
- fcntl(fd, F_SETFD, plan->u1.s);
return 1;
- }
- return 0;
+ } else if (err == EINPROGRESS)
+ return 0;
+
+ errno = err;
+ return -1;
}
-struct io_plan io_connect_(int fd, const struct addrinfo *addr,
- struct io_plan (*cb)(struct io_conn*, void *),
- void *arg)
+struct io_plan *io_connect_(struct io_conn *conn, const struct addrinfo *addr,
+ struct io_plan *(*next)(struct io_conn *, void *),
+ void *next_arg)
{
- struct io_plan plan;
-
- assert(cb);
+ int fd = io_conn_fd(conn);
- plan.next = cb;
- plan.next_arg = arg;
+ /* We don't actually need the arg, but we need it polling. */
+ io_plan_arg(conn, IO_OUT);
- /* Save old flags, set nonblock if not already. */
- plan.u1.s = fcntl(fd, F_GETFD);
- fcntl(fd, F_SETFD, plan.u1.s | O_NONBLOCK);
+ /* Note that io_new_conn() will make fd O_NONBLOCK */
/* Immediate connect can happen. */
- if (connect(fd, addr->ai_addr, addr->ai_addrlen) == 0) {
- /* Dummy will be called immediately. */
- plan.pollflag = POLLOUT;
- plan.io = already_connected;
- } else {
- if (errno != EINPROGRESS)
- return io_close_();
-
- plan.pollflag = POLLIN;
- plan.io = do_connect;
- }
- return plan;
+ if (connect(fd, addr->ai_addr, addr->ai_addrlen) == 0)
+ return set_always(conn, IO_OUT, next, next_arg);
+
+ if (errno != EINPROGRESS)
+ return io_close(conn);
+
+ return io_set_plan(conn, IO_OUT, do_connect, next, next_arg);
}
-struct io_plan io_wait_(const void *wait,
- struct io_plan (*cb)(struct io_conn *, void*),
- void *arg)
+static struct io_plan *io_wait_dir(struct io_conn *conn,
+ const void *wait,
+ enum io_direction dir,
+ struct io_plan *(*next)(struct io_conn *,
+ void *),
+ void *next_arg)
{
- struct io_plan plan;
+ struct io_plan_arg *arg = io_plan_arg(conn, dir);
+ arg->u1.const_vp = wait;
- assert(cb);
- plan.pollflag = 0;
- plan.io = NULL;
- plan.next = cb;
- plan.next_arg = arg;
+ conn->plan[dir].status = IO_WAITING;
- plan.u1.const_vp = wait;
+ return io_set_plan(conn, dir, NULL, next, next_arg);
+}
- return plan;
+struct io_plan *io_wait_(struct io_conn *conn,
+ const void *wait,
+ struct io_plan *(*next)(struct io_conn *, void *),
+ void *next_arg)
+{
+ return io_wait_dir(conn, wait, IO_IN, next, next_arg);
+}
+
+struct io_plan *io_out_wait_(struct io_conn *conn,
+ const void *wait,
+ struct io_plan *(*next)(struct io_conn *, void *),
+ void *next_arg)
+{
+ return io_wait_dir(conn, wait, IO_OUT, next, next_arg);
}
void io_wake(const void *wait)
{
- backend_wait_changed(wait);
+ backend_wake(wait);
}
-void io_ready(struct io_conn *conn)
+/* Returns false if this should not be touched (eg. freed). */
+static bool do_plan(struct io_conn *conn, struct io_plan *plan,
+ bool idle_on_epipe)
{
- /* Beware io_close_other! */
- if (!conn->plan.next)
- return;
+ /* We shouldn't have polled for this event if this wasn't true! */
+ assert(plan->status == IO_POLLING);
- set_current(conn);
- switch (conn->plan.io(conn->fd.fd, &conn->plan)) {
- case -1: /* Failure means a new plan: close up. */
- conn->plan = io_close();
- backend_plan_changed(conn);
- break;
- case 0: /* Keep going with plan. */
- break;
- case 1: /* Done: get next plan. */
- if (timeout_active(conn))
- backend_del_timeout(conn);
- /* In case they call io_duplex, clear our poll flags so
- * both sides don't seem to be both doing read or write
- * (See assert(!mask || pfd->events != mask) in poll.c) */
- conn->plan.pollflag = 0;
- conn->plan = conn->plan.next(conn, conn->plan.next_arg);
- backend_plan_changed(conn);
+ switch (plan->io(conn->fd.fd, &plan->arg)) {
+ case -1:
+ if (errno == EPIPE && idle_on_epipe) {
+ plan->status = IO_UNSET;
+ backend_new_plan(conn);
+ return false;
+ }
+ io_close(conn);
+ return false;
+ case 0:
+ return true;
+ case 1:
+ return next_plan(conn, plan);
+ default:
+ /* IO should only return -1, 0 or 1 */
+ abort();
}
- set_current(NULL);
}
-/* Close the connection, we're done. */
-struct io_plan io_close_(void)
+void io_ready(struct io_conn *conn, int pollflags)
{
- struct io_plan plan;
+ if (pollflags & POLLIN)
+ if (!do_plan(conn, &conn->plan[IO_IN], false))
+ return;
- plan.pollflag = 0;
- /* This means we're closing. */
- plan.next = NULL;
- plan.u1.s = errno;
+ if (pollflags & POLLOUT)
+ /* If we're writing to a closed pipe, we need to wait for
+ * read to fail if we're duplex: we want to drain it! */
+ do_plan(conn, &conn->plan[IO_OUT],
+ (conn->plan[IO_IN].status == IO_POLLING
+ || conn->plan[IO_IN].status == IO_ALWAYS));
+}
- return plan;
+void io_do_always(struct io_conn *conn)
+{
+ /* There's a corner case where the in next_plan wakes up the
+ * out, placing it in IO_ALWAYS and we end up processing it immediately,
+ * only to leave it in the always list.
+ *
+ * Yet we can't just process one, in case they are both supposed
+ * to be done, so grab state beforehand.
+ */
+ bool always_out = (conn->plan[IO_OUT].status == IO_ALWAYS);
+
+ if (conn->plan[IO_IN].status == IO_ALWAYS)
+ if (!next_plan(conn, &conn->plan[IO_IN]))
+ return;
+
+ if (always_out) {
+ /* You can't *unalways* a conn (except by freeing, in which
+ * case next_plan() returned false */
+ assert(conn->plan[IO_OUT].status == IO_ALWAYS);
+ next_plan(conn, &conn->plan[IO_OUT]);
+ }
}
-struct io_plan io_close_cb(struct io_conn *conn, void *arg)
+void io_do_wakeup(struct io_conn *conn, enum io_direction dir)
{
- return io_close();
+ struct io_plan *plan = &conn->plan[dir];
+
+ assert(plan->status == IO_WAITING);
+
+ set_always(conn, dir, plan->next, plan->next_arg);
}
-void io_close_other(struct io_conn *conn)
+/* Close the connection, we're done. */
+struct io_plan *io_close(struct io_conn *conn)
{
- /* Don't close if already closing! */
- if (conn->plan.next) {
- conn->plan = io_close_();
- backend_plan_changed(conn);
- }
+ tal_free(conn);
+ return &io_conn_freed;
}
-/* Exit the loop, returning this (non-NULL) arg. */
-struct io_plan io_break_(void *ret, struct io_plan plan)
+struct io_plan *io_close_cb(struct io_conn *conn, void *next_arg)
{
- io_plan_debug_again();
+ return io_close(conn);
+}
- assert(ret);
- io_loop_return = ret;
+struct io_plan *io_close_taken_fd(struct io_conn *conn)
+{
+ io_fd_block(conn->fd.fd, true);
- return plan;
+ cleanup_conn_without_close(conn);
+ return io_close(conn);
}
-static struct io_plan io_never_called(struct io_conn *conn, void *arg)
+/* Exit the loop, returning this (non-NULL) arg. */
+void io_break(const void *ret)
{
- abort();
+ assert(ret);
+ io_loop_return = (void *)ret;
}
-struct io_plan io_never(void)
+struct io_plan *io_never(struct io_conn *conn, void *unused)
{
- return io_always_(io_never_called, NULL);
+ return io_always(conn, io_never_called, NULL);
}
int io_conn_fd(const struct io_conn *conn)
return conn->fd.fd;
}
-void io_set_alloc(void *(*allocfn)(size_t size),
- void *(*reallocfn)(void *ptr, size_t size),
- void (*freefn)(void *ptr))
+struct io_plan *io_duplex(struct io_conn *conn,
+ struct io_plan *in_plan, struct io_plan *out_plan)
+{
+ assert(conn == container_of(in_plan, struct io_conn, plan[IO_IN]));
+ /* in_plan must be conn->plan[IO_IN], out_plan must be [IO_OUT] */
+ assert(out_plan == in_plan + 1);
+ return out_plan + 1;
+}
+
+struct io_plan *io_halfclose(struct io_conn *conn)
+{
+ /* Both unset? OK. */
+ if (conn->plan[IO_IN].status == IO_UNSET
+ && conn->plan[IO_OUT].status == IO_UNSET)
+ return io_close(conn);
+
+ /* We leave this unset then. */
+ if (conn->plan[IO_IN].status == IO_UNSET)
+ return &conn->plan[IO_IN];
+ else
+ return &conn->plan[IO_OUT];
+}
+
+struct io_plan *io_set_plan(struct io_conn *conn, enum io_direction dir,
+ int (*io)(int fd, struct io_plan_arg *arg),
+ struct io_plan *(*next)(struct io_conn *, void *),
+ void *next_arg)
+{
+ struct io_plan *plan = &conn->plan[dir];
+
+ plan->io = io;
+ plan->next = next;
+ plan->next_arg = next_arg;
+ assert(next != NULL);
+
+ return plan;
+}
+
+bool io_flush_sync(struct io_conn *conn)
{
- io_alloc.alloc = allocfn;
- io_alloc.realloc = reallocfn;
- io_alloc.free = freefn;
+ struct io_plan *plan = &conn->plan[IO_OUT];
+ bool ok;
+
+ /* Not writing? Nothing to do. */
+ if (plan->status != IO_POLLING)
+ return true;
+
+ /* Synchronous please. */
+ io_fd_block(io_conn_fd(conn), true);
+
+again:
+ switch (plan->io(conn->fd.fd, &plan->arg)) {
+ case -1:
+ ok = false;
+ break;
+ /* Incomplete, try again. */
+ case 0:
+ goto again;
+ case 1:
+ ok = true;
+ /* In case they come back. */
+ set_always(conn, IO_OUT, plan->next, plan->next_arg);
+ break;
+ default:
+ /* IO should only return -1, 0 or 1 */
+ abort();
+ }
+
+ io_fd_block(io_conn_fd(conn), false);
+ return ok;
}
projects / ccan / blobdiff