tail: fix SEGV on "tail -N"

config system: clarify PREFER_APPLETS/SH_STANDALONE effects in help text



git-svn-id: svn://busybox.net/trunk/busybox@18585 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 19 insertions, 10 deletions

diff --git a/shell/Config.in b/shell/Config.in
index f3726e302..027993483 100644
--- a/shell/Config.in
+++ b/shell/Config.in
@@ -242,7 +242,7 @@ config FEATURE_SH_STANDALONE
         default n
         depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS
         help
-          This option causes the selected busybox shell to use busybox applets
+          This option causes busybox shells to use busybox applets
           in preference to executables in the PATH whenever possible.  For
           example, entering the command 'ifconfig' into the shell would cause
           busybox to use the ifconfig busybox applet.  Specifying the fully
@@ -251,14 +251,23 @@ config FEATURE_SH_STANDALONE
           is generally used when creating a statically linked version of busybox
           for use as a rescue shell, in the event that you screw up your system.
 
-          Note that this will *also* cause applets to take precedence
-          over shell builtins of the same name.  So turning this on will
-          eliminate any performance gained by turning on the builtin "echo"
-          and "test" commands in ash.
-
-          Note that when using this option, the shell will attempt to directly
-          run '/bin/busybox'.  If you do not have the busybox binary sitting in
-          that exact location with that exact name, this option will not work at
-          all.
+          This is implemented by re-execing /proc/self/exe (typically)
+          with right parameters. Some selected applets ("NOFORK" applets)
+          can even be executed without creating new process.
+          Instead, busybox will call <applet>_main() internally.
+
+          However, this causes problems in chroot jails without mounted /proc
+          and with ps/top (command name can be shown as 'exe' for applets
+          started this way).
+# untrue?
+#         Note that this will *also* cause applets to take precedence
+#         over shell builtins of the same name.  So turning this on will
+#         eliminate any performance gained by turning on the builtin "echo"
+#         and "test" commands in ash.
+# untrue?
+#         Note that when using this option, the shell will attempt to directly
+#         run '/bin/busybox'.  If you do not have the busybox binary sitting in
+#         that exact location with that exact name, this option will not work at
+#         all.
 
 endmenu