--- /dev/null
+/* Check a bug where we have just completed a read, then set up a duplex
+ * which tries to do a read. */
+#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 "65014"
+#endif
+
+#define is_idle(conn) ((conn)->plan.io == NULL)
+
+struct data {
+ struct io_listener *l;
+ int state;
+ struct io_conn *c1, *c2;
+ char buf[4];
+ char wbuf[32];
+};
+
+static void finish_ok(struct io_conn *conn, struct data *d)
+{
+ d->state++;
+}
+
+static struct io_plan end(struct io_conn *conn, struct data *d)
+{
+ d->state++;
+
+ /* last one out closes. */
+ if (conn == d->c1 && is_idle(d->c2))
+ return io_close();
+
+ /* last one out closes. */
+ if (conn == d->c2 && is_idle(d->c1))
+ return io_close();
+
+ return io_idle();
+}
+
+static struct io_plan make_duplex(struct io_conn *conn, struct data *d)
+{
+ /* Have duplex read the rest of the buffer. */
+ d->c2 = io_duplex(conn, io_read(d->buf+1, sizeof(d->buf)-1, end, d));
+ ok1(d->c2);
+ io_set_finish(d->c2, finish_ok, d);
+
+ return io_write(d->wbuf, sizeof(d->wbuf), end, d);
+}
+
+static void init_conn(int fd, struct data *d)
+{
+ ok1(d->state == 0);
+ d->state++;
+
+ io_close_listener(d->l);
+
+ memset(d->wbuf, 7, sizeof(d->wbuf));
+
+ d->c1 = io_new_conn(fd, io_read(d->buf, 1, make_duplex, d));
+ io_set_finish(d->c1, finish_ok, d);
+}
+
+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));
+ struct addrinfo *addrinfo;
+ int fd, status;
+
+ /* This is how many tests you plan to run */
+ plan_tests(10);
+ d->state = 0;
+ fd = make_listen_fd(PORT, &addrinfo);
+ ok1(fd >= 0);
+ d->l = io_new_listener(fd, init_conn, d);
+ ok1(d->l);
+ fflush(stdout);
+ if (!fork()) {
+ int i;
+ char buf[32];
+
+ io_close_listener(d->l);
+ free(d);
+ 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);
+ signal(SIGPIPE, SIG_IGN);
+ for (i = 0; i < strlen("hellothere"); i++) {
+ if (write(fd, "hellothere" + i, 1) != 1)
+ break;
+ }
+ for (i = 0; i < 32; i++) {
+ if (read(fd, buf+i, 1) != 1)
+ break;
+ }
+ close(fd);
+ freeaddrinfo(addrinfo);
+ exit(0);
+ }
+ freeaddrinfo(addrinfo);
+ ok1(io_loop() == NULL);
+ ok1(d->state == 5);
+ ok1(memcmp(d->buf, "hellothere", sizeof(d->buf)) == 0);
+ free(d);
+
+ ok1(wait(&status));
+ ok1(WIFEXITED(status));
+ ok1(WEXITSTATUS(status) == 0);
+
+ /* This exits depending on whether all tests passed */
+ return exit_status();
+}