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-rw-r--r--include/pub_tool_libcproc.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/pub_tool_libcproc.h b/include/pub_tool_libcproc.h
index e8588f525..b4e008010 100644
--- a/include/pub_tool_libcproc.h
+++ b/include/pub_tool_libcproc.h
@@ -35,7 +35,9 @@
Command-line and environment stuff
------------------------------------------------------------------ */
-/* Client args and environment (which can be inspected with VG_(getenv)(). */
+/* Client args and environment. Note that VG_(client_argv)[] can be written
+ to by the client, so you should check each entry is non-NULL before
+ printing. VG_(client_envp) can be inspected with VG_(getenv)(). */
extern Int VG_(client_argc);
extern Char** VG_(client_argv);
extern Char** VG_(client_envp);