lpd: spool mode added by Vladimir

lpr: more robust error reporting
*: introduce and use xchroot
libbb: full_read/write now will report partial data counts prior to error
isdirectory.c: style fixes

lpd_main                                             249     486    +237
xchroot                                                -      29     +29
get_response_or_say_and_die                          110     139     +29
full_write                                            52      60      +8
full_read                                             55      63      +8
static.newline                                         1       -      -1
switch_root_main                                     404     400      -4
chpst_main                                          1089    1079     -10
getopt32                                            1370    1359     -11
chroot_main                                          115     101     -14
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 4/4 up/down: 311/-40)           Total: 271 bytes
   text    data     bss     dec     hex filename
 798472     728    7484  806684   c4f1c busybox_old
 798775     728    7484  806987   c504b busybox_unstripped

1 files changed, 2 insertions, 1 deletions

diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index bd1e9d5ce..3a1741179 100644
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -105,8 +105,9 @@ int switch_root_main(int argc, char **argv)
         // Overmount / with newdir and chroot into it.  The chdir is needed to
         // recalculate "." and ".." links.
 
-        if (mount(".", "/", NULL, MS_MOVE, NULL) || chroot("."))
+        if (mount(".", "/", NULL, MS_MOVE, NULL))
                 bb_error_msg_and_die("error moving root");
+        xchroot(".");
         xchdir("/");
 
         // If a new console specified, redirect stdin/stdout/stderr to that.