ash: reinstate applet name variable after forkshell

When 'sh --forkshell' is invoked the BB_APPLET_<pid> environment
variable is set, but then it's cleared when the environment of the
child process is restored.  Reinstate it in reinitvar.

1 files changed, 7 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 6d24fb55a..2a1ddac39 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -14975,6 +14975,13 @@ reinitvar(void)
                 varinit[i].var_func = varinit_data[i].var_func;
         }
         vlineno.var_text = linenovar;
+
+        /*
+         * BB_APPLET_<pid> was correct when 'sh --forkshell' was started
+         * but has now been overwritten by the environment from the forkshell
+         * data block.  Reinstate it.
+         */
+        setvareq(bb_applet_pid(), VEXPORT);
 }
 
 /* FIXME: should consider running forkparent() and forkchild() */