+#include <ccan/io/io.h>
+/* Include the C files directly. */
+#include <ccan/io/poll.c>
+#include <ccan/io/io.c>
+#include <ccan/tap/tap.h>
+#include <sys/wait.h>
+#include <stdio.h>
+
+#ifndef PORT
+#define PORT "65009"
+#endif
+
+static struct io_listener *l;
+
+struct data {
+ int state;
+ char buf[10];
+};
+
+static struct io_plan closer(struct io_conn *conn, struct data *d)
+{
+ d->state++;
+ return io_close();
+}
+
+static struct io_plan connected(struct io_conn *conn, struct data *d2)
+{
+ ok1(d2->state == 0);
+ d2->state++;
+ return io_read(d2->buf, sizeof(d2->buf), closer, d2);
+}
+
+static void init_conn(int fd, struct data *d)
+{
+ ok1(d->state == 0);
+ d->state++;
+ io_new_conn(fd, io_write(d->buf, sizeof(d->buf), closer, d));
+ io_close_listener(l);
+}
+
+static int make_listen_fd(const char *port, struct addrinfo **info)
+{
+ int fd, on = 1;
+ struct addrinfo *addrinfo, hints;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_PASSIVE;
+ hints.ai_protocol = 0;
+
+ if (getaddrinfo(NULL, port, &hints, &addrinfo) != 0)
+ return -1;
+
+ fd = socket(addrinfo->ai_family, addrinfo->ai_socktype,
+ addrinfo->ai_protocol);
+ if (fd < 0)
+ return -1;
+
+ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+ if (bind(fd, addrinfo->ai_addr, addrinfo->ai_addrlen) != 0) {
+ close(fd);
+ return -1;
+ }
+ if (listen(fd, 1) != 0) {
+ close(fd);
+ return -1;
+ }
+ *info = addrinfo;
+ return fd;
+}
+
+int main(void)
+{
+ struct data *d = malloc(sizeof(*d)), *d2 = malloc(sizeof(*d2));
+ struct addrinfo *addrinfo;
+ int fd;
+
+ /* This is how many tests you plan to run */
+ plan_tests(8);
+ d->state = 0;
+ memset(d->buf, 'a', sizeof(d->buf));
+ fd = make_listen_fd(PORT, &addrinfo);
+ ok1(fd >= 0);
+ l = io_new_listener(fd, init_conn, d);
+ ok1(l);
+
+ fd = socket(addrinfo->ai_family, addrinfo->ai_socktype,
+ addrinfo->ai_protocol);
+ d2->state = 0;
+ ok1(io_new_conn(fd, io_connect(fd, addrinfo, connected, d2)));
+
+ ok1(io_loop() == NULL);
+ ok1(d->state == 2);
+ ok1(d2->state == 2);
+
+ freeaddrinfo(addrinfo);
+ free(d);
+ free(d2);
+
+ /* This exits depending on whether all tests passed */
+ return exit_status();
+}