noux: add SYSCALL_SYNC

File systems using the File_system_session interface can now be
synchronized by using this syscall. This is needed for file system
that maintain an internal cache, which should be flushed.

Fixes #1008.

ports/include/noux_session/noux_session.h

@@ -75,6 +75,7 @@ namespace Noux {
 			SYSCALL_GETTIMEOFDAY,
 			SYSCALL_CLOCK_GETTIME,
 			SYSCALL_UTIMES,
+			SYSCALL_SYNC,
 			SYSCALL_INVALID = -1
 		};
 
@@ -122,6 +123,7 @@ namespace Noux {
 			NOUX_DECL_SYSCALL_NAME(GETTIMEOFDAY)
 			NOUX_DECL_SYSCALL_NAME(CLOCK_GETTIME)
 			NOUX_DECL_SYSCALL_NAME(UTIMES)
+			NOUX_DECL_SYSCALL_NAME(SYNC)
 			case SYSCALL_INVALID: return 0;
 			}
 			return 0;

ports/include/noux_session/sysio.h

@@ -494,6 +494,8 @@ namespace Noux {
 
 			SYSIO_DECL(utimes,      { Path path; unsigned long sec; unsigned long usec; },
 			                        { });
+
+			SYSIO_DECL(sync,        { }, { });
 		};
 	};
 };