X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=ftpd.c;h=b35a9a04b1509d638204dd34061ba87c41420a6f;hb=9e83a47a9d9bd9a8020a80393e1f0e03bb34efe7;hp=637469b9a2b4c98cc41220cf4fbe9209c5d45ec9;hpb=84aa46cb6489dcd731776eb9e4a91943b8bc6d92;p=betaftpd

diff --git a/ftpd.c b/ftpd.c
index 637469b..b35a9a0 100644
--- a/ftpd.c
+++ b/ftpd.c
@@ -112,6 +112,10 @@
 #include <linux/socket.h>
 #endif
 
+#if HAVE_LINUX_TCP_H
+#include <linux/tcp.h>
+#endif
+
 #if HAVE_MMAP
 #include <sys/mman.h>
 #endif
@@ -198,6 +202,10 @@ fd_set master_fds, master_send_fds;
 FILE *xferlog = NULL;
 #endif
 
+#if HAVE_LINUX_SENDFILE
+int sendfile_supported = 1;
+#endif
+
 /*
  * This variable specifies if it's soon time to check for timed out
  * clients, and timed out directory listing cache entries. It is
@@ -790,7 +798,7 @@ int do_download(struct ftran *f)
 	 * Here we use a rather simplified sending `algorithm',
 	 * leaving most of the quirks to the system calls.
 	 */
-	if (f->dir_listing == 0) {
+	if (sendfile_supported == 1 && f->dir_listing == 0) {
 		int err;
 		size = f->size - f->pos;
 
@@ -997,6 +1005,19 @@ int main(void)
 	alarm(60);
 	signal(SIGALRM, handle_alarm);
 
+#if HAVE_LINUX_SENDFILE
+	/* check that sendfile() is really implemented (same check as configure does) */
+	{
+		int out_fd = 1, in_fd = 0;
+		off_t offset = 0;
+		size_t size = 1024;
+
+		errno = 0;
+		sendfile(out_fd, in_fd, &offset, size);
+		if (errno == ENOSYS) sendfile_supported = 0;
+	}
+#endif
+
 	for ( ;; ) {
 		int i;
 #ifndef HAVE_POLL
@@ -1373,7 +1394,7 @@ void init_file_transfer(struct ftran * const f)
 #if HAVE_MMAP
 	if (f->dir_listing == 0) {
 #if HAVE_LINUX_SENDFILE
-		int do_mmap = 0;
+		int do_mmap = (sendfile_supported) ? 0 : 1;
 #else
 		int do_mmap = 1;
 #endif