io: io_always, and zero-length operations support.

[ccan] / ccan / io / backend.h

diff --git a/ccan/io/backend.h b/ccan/io/backend.h
index 30a338f77a73958eaf83acad62eb87b027d27025..e2090ff14068ebe0a34317941bb8efc6f7cb9a0a 100644 (file)
--- a/ccan/io/backend.h
+++ b/ccan/io/backend.h
@@ -3,6 +3,17 @@
 #define CCAN_IO_BACKEND_H
 #include <stdbool.h>
 #include <ccan/timer/timer.h>
+#include <poll.h>
+
+/* A setting for actions to always run (eg. zero-length reads). */
+#define POLLALWAYS (((POLLIN|POLLOUT) + 1) & ~((POLLIN|POLLOUT)))
+
+struct io_alloc {
+       void *(*alloc)(size_t size);
+       void *(*realloc)(void *ptr, size_t size);
+       void (*free)(void *ptr);
+};
+extern struct io_alloc io_alloc;
 
 struct fd {
        int fd;