From facc08793683c63cc658d0ae549f3561411f0a08 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Mon, 9 Feb 2015 22:51:18 -0500
Subject: Implement and document GPSD_SHM_KEY environment variable.

---
 libgps.xml | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'libgps.xml')

diff --git a/libgps.xml b/libgps.xml
index d9abebd5..d9f82db8 100644
--- a/libgps.xml
+++ b/libgps.xml
@@ -261,6 +261,16 @@ as in the example given below.  Resources within the session object
 will be properly released when it is garbage-collected.</para>
 </refsect1>
 
+<refsect1 id='environment'><title>ENVIRONMENT VARIABLES</title>
+
+<para>By setting the environment variable <envar>GPSD_SHM_KEY</envar>,
+you can control the key value used to create shared-memory segment
+used for communication with <application>gpsd</application>.  This
+will be useful mainly when isolating test instances of
+<application>gpsd</application> from production ones.</para>
+
+</refsect1>
+
 <refsect1 id='example'><title>CODE EXAMPLE</title>
 
 <para>The following is an excerpted and simplified version of the
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