event/MultiSocketMonitor: add method ReplaceSocketList()

Move code from AlsaMixerPlugin.

2 files changed, 42 insertions, 0 deletions

diff --git a/src/event/MultiSocketMonitor.cxx b/src/event/MultiSocketMonitor.cxx
index 39b6f3e0d..b5114cfb3 100644
--- a/src/event/MultiSocketMonitor.cxx
+++ b/src/event/MultiSocketMonitor.cxx
@@ -20,6 +20,10 @@
 #include "config.h"
 #include "MultiSocketMonitor.hxx"
 
+#ifndef WIN32
+#include <poll.h>
+#endif
+
 MultiSocketMonitor::MultiSocketMonitor(EventLoop &_loop)
 	:IdleMonitor(_loop), TimeoutMonitor(_loop), ready(false) {
 }
@@ -29,6 +33,32 @@ MultiSocketMonitor::~MultiSocketMonitor()
 	// TODO
 }
 
+#ifndef WIN32
+
+void
+MultiSocketMonitor::ReplaceSocketList(pollfd *pfds, unsigned n)
+{
+	pollfd *const end = pfds + n;
+
+	UpdateSocketList([pfds, end](int fd) -> unsigned {
+			auto i = std::find_if(pfds, end, [fd](const struct pollfd &pfd){
+					return pfd.fd == fd;
+				});
+			if (i == end)
+				return 0;
+
+			auto events = i->events;
+			i->events = 0;
+			return events;
+		});
+
+	for (auto i = pfds; i != end; ++i)
+		if (i->events != 0)
+			AddSocket(i->fd, i->events);
+}
+
+#endif
+
 void
 MultiSocketMonitor::Prepare()
 {
diff --git a/src/event/MultiSocketMonitor.hxx b/src/event/MultiSocketMonitor.hxx
index d1cac880a..6c76d667f 100644
--- a/src/event/MultiSocketMonitor.hxx
+++ b/src/event/MultiSocketMonitor.hxx
@@ -39,6 +39,10 @@
 #endif
 #endif
 
+#ifndef WIN32
+struct pollfd;
+#endif
+
 class EventLoop;
 
 /**
@@ -135,6 +139,14 @@ public:
 		}
 	}
 
+#ifndef WIN32
+	/**
+	 * Replace the socket list with the given file descriptors.
+	 * The given pollfd array will be modified by this method.
+	 */
+	void ReplaceSocketList(pollfd *pfds, unsigned n);
+#endif
+
 protected:
 	/**
 	 * @return timeout [ms] or -1 for no timeout