shell: Add rtems_shell_dup_current_env to get a default env.

Remove rtems_current_shell_env as this is dangerous because
the env can be NULL if used outside of a valid shell with the
POSIX key to an env set up.

Clean up the usage of rtems_current_shell_env.

1 files changed, 4 insertions, 1 deletions

diff --git a/cpukit/libmisc/shell/main_logoff.c b/cpukit/libmisc/shell/main_logoff.c
index 0535d092cb..e902744b6d 100644
--- a/cpukit/libmisc/shell/main_logoff.c
+++ b/cpukit/libmisc/shell/main_logoff.c
@@ -25,9 +25,12 @@ static int rtems_shell_main_logoff(
   char *argv[] __attribute__((unused))
 )
 {
+  rtems_shell_env_t *env = rtems_shell_get_current_env();
+
   printf("logoff from the system...");
 
-  rtems_current_shell_env->exit_shell = true;
+  if (env)
+    env->exit_shell = true;
 
   return 0;
 }