system/SignalFD: throw exception on error

src/event/SignalMonitor.hxx

@@ -32,6 +32,8 @@ typedef BoundMethod<void()> SignalHandler;
 
 /**
  * Initialise the signal monitor subsystem.
+ *
+ * Throws on error.
  */
 void
 SignalMonitorInit(EventLoop &loop);

src/system/SignalFD.cxx

@@ -20,7 +20,7 @@
 #include "config.h"
 #ifdef USE_SIGNALFD
 #include "SignalFD.hxx"
-#include "FatalError.hxx"
+#include "Error.hxx"
 
 #include <assert.h>
 #include <sys/signalfd.h>
@@ -29,7 +29,7 @@ void
 SignalFD::Create(const sigset_t &mask)
 {
 	if (!fd.CreateSignalFD(&mask))
-		FatalSystemError("signalfd() failed");
+		throw MakeErrno("signalfd() failed");
 }
 
 int

src/system/SignalFD.hxx

@@ -35,9 +35,10 @@ public:
 	/**
 	 * Create the signalfd or update its mask.
 	 *
-	 * All errors are fatal.
+	 * Throws on error.
 	 */
 	void Create(const sigset_t &mask);
+
 	void Close() {
 		fd.Close();
 	}