iproute2: Auto-detect the presence of setns in libc
If libc has setns present use that version instead of
rolling the syscall wrapper by hand.
Dan McGee found the following compile error:
gcc -D_GNU_SOURCE -O2 -Wstrict-prototypes -Wall -I../include
-DRESOLVE_HOSTNAMES -DLIBDIR=\"/usr/lib/\" -c -o ipnetns.o ipnetns.c
ipnetns.c:31:12: error: static declaration of ‘setns’ follows non-static
declaration
/usr/include/bits/sched.h:93:12: note: previous declaration of ‘setns’
was here
make[1]: *** [ipnetns.o] Error 1
Reported-by: Dan McGee <dan@archlinux.org>
Tested-by: Dan McGee <dan@archlinux.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
diff --git a/configure b/configure
index 0795df8..f5c3d40 100755
--- a/configure
+++ b/configure
@@ -158,6 +158,27 @@
echo "not found!"
}
+check_setns()
+{
+cat >/tmp/setnstest.c <<EOF
+#include <sched.h>
+int main(int argc, char **argv)
+{
+ (void)setns(0,0);
+ return 0;
+}
+EOF
+gcc -I$INCLUDE -o /tmp/setnstest /tmp/setnstest.c >/dev/null 2>&1
+if [ $? -eq 0 ]
+then
+ echo "IP_CONFIG_SETNS:=y" >>Config
+ echo "yes"
+else
+ echo "no"
+fi
+rm -f /tmp/setnstest.c /tmp/setnstest
+}
+
echo "# Generated config based on" $INCLUDE >Config
echo "TC schedulers"
@@ -173,3 +194,6 @@
echo -n "iptables modules directory: "
check_ipt_lib_dir
+
+echo -n "libc has setns: "
+check_setns