X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=configure.in;h=c912e34f7b50623c134040332d99a29d983c898e;hb=9e83a47a9d9bd9a8020a80393e1f0e03bb34efe7;hp=cddb6a18c41478bf6819a2249b8d40a072c567f9;hpb=6eaf93053f43aa6d456475e56e7b50d4b13c6d2d;p=betaftpd

diff --git a/configure.in b/configure.in
index cddb6a1..c912e34 100644
--- a/configure.in
+++ b/configure.in
@@ -168,6 +168,7 @@ fi
 
 if test "$result" = "no"; then
 	AC_CHECK_HEADER(linux/socket.h)
+	AC_CHECK_HEADER(linux/tcp.h)
 fi
 
 AC_CHECK_HEADERS(sys/poll.h)
@@ -194,6 +195,9 @@ dnl
 dnl sendfile() is not standard -- we'll have to check the different
 dnl versions one by one :-)
 dnl
+dnl Unfortunately, we'll have to run the program too -- this is a
+dnl problem with newer libc's and not-so-new kernels :-)
+dnl
 AC_CHECK_HEADERS(sys/sendfile.h,result=yes,result=no)
 
 if test "$result" = "yes"; then
@@ -219,9 +223,14 @@ if test "$result" = "yes"; then
 #include <sys/types.h>
 #endif
 
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
 #if HAVE_SYS_UIO_H
 #include <sys/uio.h>
-#endif],[
+#endif
+],[
 	int out_fd = 1, in_fd = 0;
 	off_t offset = 0;
 	size_t size = 1024;
@@ -231,7 +240,71 @@ if test "$result" = "yes"; then
 	AC_MSG_RESULT($enableval)
 
 	if test "$enableval" = "yes"; then
-		AC_DEFINE(HAVE_LINUX_SENDFILE, 1, [Define if you have sendfile() with the Linux semantics.])
+		dnl
+		dnl If the compile fails now, we assume sendfile() exists (since this
+		dnl is by far the most common case)
+		dnl
+		AC_MSG_CHECKING([that sendfile() really is implemented])
+
+		AC_TRY_RUN([
+#if HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+#if HAVE_SYS_LIMITS_H
+#include <sys/limits.h>
+#endif
+
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#if HAVE_SYS_SENDFILE_H
+#include <sys/sendfile.h>
+#endif
+
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
+#if HAVE_SYS_UIO_H
+#include <sys/uio.h>
+#endif
+
+int main() {
+        int out_fd = 1, in_fd = 0;
+        off_t offset = 0;
+        size_t size = 1024;
+
+	errno = 0;
+	sendfile(out_fd, in_fd, &offset, size);
+	if (errno == ENOSYS)
+		return 0;
+	else
+		return 1;
+}],
+		enableval=no,enableval=yes,[enableval="cross-compiling, not checked"])
+	        AC_MSG_RESULT($enableval)
+
+		has_sendfile=$enableval
+
+		dnl
+		dnl Force sendfile() `state' if the user tells us to
+		dnl
+		AC_ARG_WITH(linux-sendfile,[  --with-linux-sendfile   Force sendfile() support],has_sendfile=$withval)
+
+		if test $has_sendfile != "no"; then
+			AC_DEFINE(HAVE_LINUX_SENDFILE, 1, [Define if you have sendfile() with the Linux semantics.])
+			has_sendfile=enabled
+		else
+			has_sendfile=disabled
+		fi
+		AC_MSG_CHECKING([final status of Linux sendfile() support])
+		AC_MSG_RESULT($has_sendfile)
 	fi
 fi