Revert "io: closing one side of a duplex connection closes both."

[ccan] / ccan / io / io.h

diff --git a/ccan/io/io.h b/ccan/io/io.h
index b5ffdd243bfd8a1710e551741261bb9159923cff..4468cee3ab0d10d14aacd6cc3cfa3462bc8ec114 100644 (file)
--- a/ccan/io/io.h
+++ b/ccan/io/io.h
@@ -431,6 +431,21 @@ struct io_conn *io_duplex_(struct io_conn *conn, struct io_plan plan);
 #define io_wake(conn, plan) (io_plan_no_debug(), io_wake_((conn), (plan)))
 void io_wake_(struct io_conn *conn, struct io_plan plan);
 
+/**
+ * io_is_idle - is a connection idle?
+ *
+ * This can be useful for complex protocols, eg. where you want a connection
+ * to send something, so you queue it and wake it if it's idle.
+ *
+ * Example:
+ *     struct io_conn *sleeper;
+ *     sleeper = io_new_conn(open("/dev/null", O_RDONLY), io_idle());
+ *
+ *     assert(io_is_idle(sleeper));
+ *     io_wake(sleeper, io_write("junk", 4, io_close_cb, NULL));
+ */
+bool io_is_idle(const struct io_conn *conn);
+
 /**
  * io_break - return from io_loop()
  * @ret: non-NULL value to return from io_loop().
@@ -490,4 +505,25 @@ struct io_plan io_close_cb(struct io_conn *, void *unused);
  *     io_loop();
  */
 void *io_loop(void);
+
+/**
+ * io_conn_fd - get the fd from a connection.
+ * @conn: the connection.
+ *
+ * Sometimes useful, eg for getsockname().
+ */
+int io_conn_fd(const struct io_conn *conn);
+
+/**
+ * io_set_alloc - set alloc/realloc/free function for io to use.
+ * @allocfn: allocator function
+ * @reallocfn: reallocator function, ptr may be NULL, size never 0.
+ * @freefn: free function
+ *
+ * By default io uses malloc/realloc/free, and returns NULL if they fail.
+ * You can set your own variants here.
+ */
+void io_set_alloc(void *(*allocfn)(size_t size),
+                 void *(*reallocfn)(void *ptr, size_t size),
+                 void (*freefn)(void *ptr));
 #endif /* CCAN_IO_H */