Add fchroot(2)

This is similar to chroot(2), but takes a file descriptor instead
of path.  Same syscall exists in NetBSD and Solaris.  It is part of a larger
patch to make absolute pathnames usable in Capsicum mode, but should
be useful in other contexts too.

Reviewed By:	brooks
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D41564

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/libsys/Symbol.sys.map b/lib/libsys/Symbol.sys.map
index 85373b1f9cda..3e2f14497b07 100644
--- a/lib/libsys/Symbol.sys.map
+++ b/lib/libsys/Symbol.sys.map
@@ -378,6 +378,7 @@ FBSD_1.7 {
 };
 
 FBSD_1.8 {
+	fchroot;
 	getrlimitusage;
 	kcmp;
 };