ccan/io: io_connect()

[ccan] / ccan / io / io.c

diff --git a/ccan/io/io.c b/ccan/io/io.c
index ddcd502f367d3afdbbb3562b91f883be13072ece..76f1f441740476fc52dbf5dc1fc378bc16e16be1 100644 (file)
--- a/ccan/io/io.c
+++ b/ccan/io/io.c
@@ -9,6 +9,8 @@
 #include <stdlib.h>
 #include <assert.h>
 #include <poll.h>
+#include <unistd.h>
+#include <fcntl.h>
 
 void *io_loop_return;
 
@@ -337,6 +339,59 @@ struct io_plan io_write_partial_(const void *data, size_t *len,
        return plan;
 }
 
+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)
+{
+       int err, ret;
+       socklen_t len = sizeof(err);
+
+       /* Has async connect finished? */
+       ret = getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len);
+       if (ret < 0)
+               return -1;
+
+       if (err == 0) {
+               /* Restore blocking if it was initially. */
+               fcntl(fd, F_SETFD, plan->u.len_len.len1);
+               return 1;
+       }
+       return 0;
+}
+
+struct io_plan io_connect_(int fd, const struct addrinfo *addr,
+                          struct io_plan (*cb)(struct io_conn*, void *),
+                          void *arg)
+{
+       struct io_plan plan;
+
+       assert(cb);
+
+       plan.next = cb;
+       plan.next_arg = arg;
+
+       /* Save old flags, set nonblock if not already. */
+       plan.u.len_len.len1 = fcntl(fd, F_GETFD);
+       fcntl(fd, F_SETFD, plan.u.len_len.len1 | 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;
+}
+
 struct io_plan io_idle_(void)
 {
        struct io_plan plan;