io: allow overriding poll function.

[ccan] / ccan / io / poll.c

diff --git a/ccan/io/poll.c b/ccan/io/poll.c
index 043feff74046226e61c367ad68644f3aba3fb54e..a4e83ed761e77251767b01b3e3f5c5dd3492bfcd 100644 (file)
--- a/ccan/io/poll.c
+++ b/ccan/io/poll.c
@@ -17,6 +17,7 @@ static struct fd **fds = NULL;
 static LIST_HEAD(closing);
 static LIST_HEAD(always);
 static struct timemono (*nowfn)(void) = time_mono;
+static int (*pollfn)(struct pollfd *fds, nfds_t nfds, int timeout) = poll;
 
 struct timemono (*io_time_override(struct timemono (*now)(void)))(void)
 {
@@ -25,6 +26,13 @@ struct timemono (*io_time_override(struct timemono (*now)(void)))(void)
        return old;
 }
 
+int (*io_poll_override(int (*poll)(struct pollfd *fds, nfds_t nfds, int timeout)))(struct pollfd *, nfds_t, int)
+{
+       int (*old)(struct pollfd *fds, nfds_t nfds, int timeout) = pollfn;
+       pollfn = poll;
+       return old;
+}
+
 static bool add_fd(struct fd *fd, short events)
 {
        if (!max_fds) {
@@ -269,7 +277,7 @@ void *io_loop(struct timers *timers, struct timer **expired)
                        }
                }
 
-               r = poll(pollfds, num_fds, ms_timeout);
+               r = pollfn(pollfds, num_fds, ms_timeout);
                if (r < 0)
                        break;