Allow redirecting logging to an FD

This change allows redirection of logging facilities, from syslog to a
file.

Bug: None
Test: make tests  // see logging in stderr
Change-Id: Ia45ccb87908f1d4a2f7964a01d11a74da6e9fdb7
diff --git a/minijail0.1 b/minijail0.1
index d80b182..7206104 100644
--- a/minijail0.1
+++ b/minijail0.1
@@ -167,6 +167,10 @@
 \fB--uts[=hostname]\fR
 Create a new UTS/hostname namespace, and optionally set the hostname in the new
 namespace to \fIhostname\fR.
+.TP
+\fB--logging=<system>\fR
+Use \fIsystem\fR as the logging system. \fIsystem\fR must be one of
+\fBsyslog\fR (the default) or \fBstderr\fR.
 .SH IMPLEMENTATION
 This program is broken up into two parts: \fBminijail0\fR (the frontend) and a helper
 library called \fBlibminijailpreload\fR. Some jailings can only be achieved from