--- /dev/null
+#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>
+
+struct data {
+ int state;
+ size_t bytes;
+ char *buf;
+};
+
+static struct io_op *start_ok(struct io_conn *conn, struct data *d)
+{
+ ok1(d->state == 0);
+ d->state++;
+ return io_write(d->buf, d->bytes, io_next(conn, io_close, d));
+}
+
+static void finish_ok(struct io_conn *conn, struct data *d)
+{
+ ok1(d->state == 1);
+ d->state++;
+ io_break(d, NULL);
+}
+
+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;
+}
+
+static void read_from_socket(size_t bytes, const struct addrinfo *addrinfo)
+{
+ int fd, done, r;
+ char buf[100];
+
+ fd = socket(addrinfo->ai_family, addrinfo->ai_socktype,
+ addrinfo->ai_protocol);
+ if (fd < 0)
+ exit(1);
+ if (connect(fd, addrinfo->ai_addr, addrinfo->ai_addrlen) != 0)
+ exit(2);
+
+ for (done = 0; done < bytes; done += r) {
+ r = read(fd, buf, sizeof(buf));
+ if (r < 0)
+ exit(3);
+ done += r;
+ }
+ close(fd);
+}
+
+int main(void)
+{
+ struct data *d = malloc(sizeof(*d));
+ struct addrinfo *addrinfo;
+ struct io_listener *l;
+ int fd, status;
+
+ /* This is how many tests you plan to run */
+ plan_tests(9);
+ d->state = 0;
+ d->bytes = 1024*1024;
+ d->buf = malloc(d->bytes);
+ memset(d->buf, 'a', d->bytes);
+ fd = make_listen_fd("65005", &addrinfo);
+ ok1(fd >= 0);
+ l = io_new_listener(fd, start_ok, finish_ok, d);
+ ok1(l);
+ fflush(stdout);
+ if (!fork()) {
+ io_close_listener(l);
+ read_from_socket(d->bytes, addrinfo);
+ freeaddrinfo(addrinfo);
+ free(d->buf);
+ free(d);
+ exit(0);
+ }
+ ok1(io_loop() == d);
+ ok1(d->state == 2);
+
+ ok1(wait(&status));
+ ok1(WIFEXITED(status));
+ ok1(WEXITSTATUS(status) == 0);
+
+ freeaddrinfo(addrinfo);
+ free(d->buf);
+ free(d);
+ io_close_listener(l);
+
+ /* This exits depending on whether all tests passed */
+ return exit_status();
+}