net/SocketDescriptor: make eventfd() and signalfd() mandatory on Linux

src/system/EventFD.cxx

@@ -18,7 +18,7 @@
  */
 
 #include "config.h"
-#ifdef USE_EVENTFD
+#ifdef __linux__
 #include "EventFD.hxx"
 #include "system/Error.hxx"
 #include "util/Compiler.h"

src/system/FileDescriptor.cxx

@@ -37,15 +37,9 @@
 #include <poll.h>
 #endif
 
-#ifdef USE_EVENTFD
+#ifdef __linux__
 #include <sys/eventfd.h>
-#endif
-
-#ifdef USE_SIGNALFD
 #include <sys/signalfd.h>
-#endif
-
-#ifdef __linux__
 #include <sys/inotify.h>
 #endif
 
@@ -222,7 +216,7 @@ FileDescriptor::CheckDuplicate(int new_fd) noexcept
 
 #endif
 
-#ifdef USE_EVENTFD
+#ifdef __linux__
 
 bool
 FileDescriptor::CreateEventFD(unsigned initval) noexcept
@@ -231,10 +225,6 @@ FileDescriptor::CreateEventFD(unsigned initval) noexcept
 	return fd >= 0;
 }
 
-#endif
-
-#ifdef USE_SIGNALFD
-
 bool
 FileDescriptor::CreateSignalFD(const sigset_t *mask) noexcept
 {
@@ -246,10 +236,6 @@ FileDescriptor::CreateSignalFD(const sigset_t *mask) noexcept
 	return true;
 }
 
-#endif
-
-#ifdef __linux__
-
 bool
 FileDescriptor::CreateInotify() noexcept
 {

src/system/FileDescriptor.hxx

@@ -39,7 +39,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 
-#ifdef USE_SIGNALFD
+#ifdef __linux__
 #include <signal.h>
 #endif
 
@@ -181,15 +181,9 @@ public:
 	bool CheckDuplicate(int new_fd) noexcept;
 #endif
 
-#ifdef USE_EVENTFD
+#ifdef __linux__
 	bool CreateEventFD(unsigned initval=0) noexcept;
-#endif
-
-#ifdef USE_SIGNALFD
 	bool CreateSignalFD(const sigset_t *mask) noexcept;
-#endif
-
-#ifdef __linux__
 	bool CreateInotify() noexcept;
 #endif
 

src/system/SignalFD.cxx

@@ -18,7 +18,7 @@
  */
 
 #include "config.h"
-#ifdef USE_SIGNALFD
+#ifdef __linux__
 #include "SignalFD.hxx"
 #include "Error.hxx"
 
@@ -43,4 +43,4 @@ SignalFD::Read() noexcept
 		: -1;
 }
 
-#endif /* USE_SIGNALFD */
+#endif /* __linux__ */