fdpass: fix complilation on FreeBSD.

[ccan] / ccan / io / io.h

diff --git a/ccan/io/io.h b/ccan/io/io.h
index 510ee0be0166033618768b91cbcafcec8541c85b..5d084828b96aa561bbdfd6fe814ea5461f9342cb 100644 (file)
--- a/ccan/io/io.h
+++ b/ccan/io/io.h
@@ -59,7 +59,7 @@ struct io_conn;
        io_new_conn_((ctx), (fd),                                       \
                     typesafe_cb_preargs(struct io_plan *, void *,      \
                                         (init), (arg),                 \
-                                        struct io_conn *conn),         \
+                                        struct io_conn *),             \
                     (void *)(arg))
 
 struct io_conn *io_new_conn_(const tal_t *ctx, int fd,
@@ -113,6 +113,8 @@ void io_set_finish_(struct io_conn *conn,
  * (tal'ocated off @ctx) and pass that to init().  Note that if there is
  * an error on this file descriptor, it will be freed.
  *
+ * Note: if the accept fails (usually due to EMFILE), init() will be called
+ * wth
  * Returns NULL on error (and sets errno).
  *
  * Example:
@@ -389,6 +391,39 @@ struct io_plan *io_out_always_(struct io_conn *conn,
                                                       void *),
                               void *arg);
 
+/**
+ * io_sock_shutdown - start socket close process (flushes TCP sockets).
+ * @conn: the connection the plan is for
+ *
+ * Simply closing a TCP socket can lose data; unfortunately you should
+ * shutdown(SHUT_WR) and wait for the other side to see this and close.
+ * Of course, you also need to set a timer, in case it doesn't (you may
+ * already have some responsiveness timer, of course).
+ *
+ * On error, is equivalent to io_close().
+ *
+ * Example:
+ * #include <ccan/timer/timer.h>
+ *
+ * // Timer infra needs wrapper to contain extra data.
+ * struct timeout_timer {
+ *    struct timer t;
+ *    struct io_conn *conn;
+ * };
+ * static struct timers timers;
+ *
+ * static struct io_plan *flush_and_close(struct io_conn *conn)
+ * {
+ *    struct timeout_timer *timeout;
+ *    // Freed if conn closes normally.
+ *    timeout = tal(conn, struct timeout_timer);
+ *    timeout->conn = conn;
+ *    timer_addrel(&timers, &timeout->t, time_from_sec(5));
+ *    return io_sock_shutdown(conn);
+ * }
+ */
+struct io_plan *io_sock_shutdown(struct io_conn *conn);
+
 /**
  * io_connect - create an asynchronous connection to a listening socket.
  * @conn: the connection that plan is for.
@@ -722,6 +757,35 @@ bool io_plan_out_started(const struct io_conn *conn);
  */
 bool io_flush_sync(struct io_conn *conn);
 
+/**
+ * io_conn_exclusive - set/unset an io_conn to exclusively serviced
+ * @conn: the connection
+ * @exclusive: whether to be exclusive or not
+ *
+ * If any io_conn is set exclusive, then no non-exclusive io_conn (or
+ * io_listener) will be serviced by io_loop().  If it's a io_duplex io_conn(),
+ * then io_conn_exclusive() makes the read-side exclusive; io_conn_out_exclusive()
+ * makes the write-side exclusive.
+ *
+ * This allows you to temporarily service only one (or several) fds.
+ * For example, you might want to flush out one io_conn and not
+ * receive any new connections or read any other input.
+ *
+ * Returns true if any exclusive io_conn remain, otherwise false.
+ * (This is useful for checking your own logic: dangling exclusive io_conn
+ * are dangerous!).
+ */
+bool io_conn_exclusive(struct io_conn *conn, bool exclusive);
+
+/**
+ * io_conn_out_exclusive - set/unset exclusive on the write-side of a duplex
+ * @conn: the connection, post io_duplex
+ * @exclusive: whether to be exclusive or not
+ *
+ * See io_conn_exclusive() above.
+ */
+bool io_conn_out_exclusive(struct io_conn *conn, bool exclusive);
+
 /**
  * io_fd_block - helper to set an fd blocking/nonblocking.
  * @fd: the file descriptor
@@ -752,4 +816,22 @@ struct timemono (*io_time_override(struct timemono (*now)(void)))(void);
  */
 int (*io_poll_override(int (*poll)(struct pollfd *fds, nfds_t nfds, int timeout)))(struct pollfd *, nfds_t, int);
 
+/**
+ * io_have_fd - do we own this file descriptor?
+ * @fd: the file descriptor.
+ * @listener: if non-NULL, set to true if it's a listening socket (io_listener).
+ *
+ * Returns NULL if we don't own it, otherwise a struct io_conn * or struct io_listener *.
+ */
+const void *io_have_fd(int fd, bool *listener);
+
+/**
+ * io_set_extended_errors - enable callbacks for errors.
+ * @state: true or false.
+ *
+ * Defaults false for compatibility.  See io_new_conn for what this changes.
+ */
+void io_set_extended_errors(bool state);
+bool io_get_extended_errors(void);
+
 #endif /* CCAN_IO_H */