From: Karl Vogel <karl.vogel@gmail.com>
Date: Tue, 11 Feb 2014 08:37:08 +0000 (+0100)
Subject: uloop: Add flag to allow callback to be called on error conditions.
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Flibubox.git;a=commitdiff_plain;h=926121113b903bf7b6133f782c84d0ed6c1a1a58

uloop: Add flag to allow callback to be called on error conditions.

In some conditions, an application is interested in errors happening
on a file descriptor and might be able to resolve the issue in the
callback function.

This patch adds a flag to notify the uloop framework that errors
should be passed to the callback function, instead of silently
removing the fd from the polling set.

Signed-off-by: Karl Vogel <karl.vogel@gmail.com>
---

diff --git a/uloop.c b/uloop.c
index 0566d80..d293edb 100644
--- a/uloop.c
+++ b/uloop.c
@@ -174,7 +174,8 @@ static int uloop_fetch_events(int timeout)
 
 		if (events[n].flags & EV_ERROR) {
 			u->error = true;
-			uloop_fd_delete(u);
+			if (!(u->flags & ULOOP_ERROR_CB))
+				uloop_fd_delete(u);
 		}
 
 		if(events[n].filter == EVFILT_READ)
@@ -268,7 +269,8 @@ static int uloop_fetch_events(int timeout)
 
 		if (events[n].events & (EPOLLERR|EPOLLHUP)) {
 			u->error = true;
-			uloop_fd_delete(u);
+			if (!(u->flags & ULOOP_ERROR_CB))
+				uloop_fd_delete(u);
 		}
 
 		if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP))) {
diff --git a/uloop.h b/uloop.h
index 98dd818..7564514 100644
--- a/uloop.h
+++ b/uloop.h
@@ -53,6 +53,8 @@ typedef void (*uloop_process_handler)(struct uloop_process *c, int ret);
 #define ULOOP_EDGE_DEFER	(1 << 5)
 #endif
 
+#define ULOOP_ERROR_CB		(1 << 6)
+
 struct uloop_fd
 {
 	uloop_fd_handler cb;