Merge pull request #3501 from ffontaine/master

src/lxc/syscall_numbers.h

@@ -228,9 +228,6 @@
 		#if _MIPS_SIM == _MIPS_SIM_ABI64	/* n64 */
 			#define __NR_signalfd 5276
 		#endif
-	#else
-		#define -1
-		#warning "__NR_signalfd not defined for your architecture"
 	#endif
 #endif
 

src/lxc/syscall_wrappers.h

@@ -112,8 +112,10 @@ static inline int signalfd(int fd, const sigset_t *mask, int flags)
 	int retval;
 
 	retval = syscall(__NR_signalfd4, fd, mask, _NSIG / 8, flags);
+#ifdef __NR_signalfd
 	if (errno == ENOSYS && flags == 0)
 		retval = syscall(__NR_signalfd, fd, mask, _NSIG / 8);
+#endif
 
 	return retval;
 }