added check for madvise

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-merge-1.4.x@810 152afb58-edef-0310-8abb-c4023f1b3aa9

SConstruct

@@ -144,7 +144,7 @@ if 1:
 	checkFuncs(autoconf, Split('fork stat lstat strftime dup2 getcwd inet_ntoa inet_ntop memset mmap munmap strchr \
 			strdup strerror strstr strtol sendfile  getopt socket \
 			gethostbyname poll sigtimedwait epoll_ctl getrlimit chroot \
-			getuid select signal pathconf\
+			getuid select signal pathconf madvise\
 			writev sigaction sendfile64 send_file kqueue port_create localtime_r'))
 
 	checkTypes(autoconf, Split('pid_t size_t off_t'))

configure.in

@@ -442,7 +442,7 @@ esac
 AC_CHECK_FUNCS([dup2 getcwd inet_ntoa inet_ntop memset mmap munmap strchr \
 		  strdup strerror strstr strtol sendfile  getopt socket \
 		  gethostbyname poll sigtimedwait epoll_ctl getrlimit chroot \
-		  getuid select signal pathconf\
+		  getuid select signal pathconf madvise\
 		  writev sigaction sendfile64 send_file kqueue port_create localtime_r])
 
 AC_MSG_CHECKING(for Large File System support)

src/network_writev.c

@@ -245,10 +245,12 @@ int network_write_chunkqueue_writev(server *srv, connection *con, int fd, chunkq
 #ifdef LOCAL_BUFFERING
 				buffer_copy_string_len(c->mem, c->file.mmap.start, c->file.mmap.length);
 #else
+#ifdef HAVE_MADVISE
 				if (0 != madvise(c->file.mmap.start, c->file.mmap.length, MADV_WILLNEED)) {
 					log_error_write(srv, __FILE__, __LINE__, "ssbd", "madvise failed:", 
 							strerror(errno), c->file.name, c->file.fd);
 				}
+#endif
 #endif
 
 				/* chunk_reset() or chunk_free() will cleanup for us */