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# Copyright (C) Igor Sysoev
# Copyright (C) NGINX, Inc.
# Linux clone syscall.
NXT_ISOLATION=NO
NXT_HAVE_CLONE=NO
NXT_HAVE_CLONE_NEWUSER=NO
NXT_HAVE_MOUNT=NO
NXT_HAVE_UNMOUNT=NO
NXT_HAVE_ROOTFS=NO
nsflags="USER NS PID NET UTS CGROUP"
nxt_feature="clone(2)"
nxt_feature_name=NXT_HAVE_CLONE
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <sys/wait.h>
#include <sys/syscall.h>
int main() {
return SYS_clone | SIGCHLD;
}"
. auto/feature
if [ $nxt_found = yes ]; then
NXT_HAVE_CLONE=YES
# Test all isolation flags
for flag in $nsflags; do
nxt_feature="CLONE_NEW${flag}"
nxt_feature_name=NXT_HAVE_CLONE_NEW${flag}
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#define _GNU_SOURCE
#include <sys/wait.h>
#include <sys/syscall.h>
#include <sched.h>
int main() {
return CLONE_NEW$flag;
}"
. auto/feature
if [ $nxt_found = yes ]; then
if [ $flag = "USER" ]; then
NXT_HAVE_CLONE_NEWUSER=YES
fi
if [ "$NXT_ISOLATION" = "NO" ]; then
NXT_ISOLATION=$flag
else
NXT_ISOLATION="$NXT_ISOLATION $flag"
fi
fi
done
fi
nxt_feature="Linux pivot_root()"
nxt_feature_name=NXT_HAVE_PIVOT_ROOT
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <sys/syscall.h>
int main() {
return SYS_pivot_root;
}"
. auto/feature
nxt_feature="prctl(PR_SET_NO_NEW_PRIVS)"
nxt_feature_name=NXT_HAVE_PR_SET_NO_NEW_PRIVS0
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <sys/prctl.h>
int main() {
return PR_SET_NO_NEW_PRIVS;
}"
. auto/feature
nxt_feature="Linux mount()"
nxt_feature_name=NXT_HAVE_LINUX_MOUNT
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <sys/mount.h>
int main() {
return mount(\"/\", \"/\", \"bind\",
MS_BIND | MS_REC, \"\");
}"
. auto/feature
if [ $nxt_found = yes ]; then
NXT_HAVE_MOUNT=YES
fi
if [ $nxt_found = no ]; then
nxt_feature="FreeBSD nmount()"
nxt_feature_name=NXT_HAVE_FREEBSD_NMOUNT
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <sys/mount.h>
int main() {
return nmount((void *)0, 0, 0);
}"
. auto/feature
if [ $nxt_found = yes ]; then
NXT_HAVE_MOUNT=YES
fi
fi
nxt_feature="Linux umount2()"
nxt_feature_name=NXT_HAVE_LINUX_UMOUNT2
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <sys/mount.h>
int main() {
return umount2((void *)0, 0);
}"
. auto/feature
if [ $nxt_found = yes ]; then
NXT_HAVE_UNMOUNT=YES
fi
if [ $nxt_found = no ]; then
nxt_feature="unmount()"
nxt_feature_name=NXT_HAVE_UNMOUNT
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <sys/mount.h>
int main() {
return unmount((void *)0, 0);
}"
. auto/feature
if [ $nxt_found = yes ]; then
NXT_HAVE_UNMOUNT=YES
fi
fi
if [ $NXT_HAVE_MOUNT = YES -a $NXT_HAVE_UNMOUNT = YES ]; then
NXT_HAVE_ROOTFS=YES
cat << END >> $NXT_AUTO_CONFIG_H
#ifndef NXT_HAVE_ISOLATION_ROOTFS
#define NXT_HAVE_ISOLATION_ROOTFS 1
#endif
END
fi
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