less: update line input so that it doesn't interfere with

screen update. Makes "man bash", [enter], [/],
<enter search pattern>, [enter] more usable - manpage
draws as you enter the pattern! Yay!!
less: fix bug where backspace wasn't actually deleting chars
less: "examine file with empty name" doesn't abort anymore.
libbb: add "all fatal signals" mask.

getch_nowait                                           -     207    +207
status_print                                           -     105    +105
examine_file                                          64      87     +23
move_cursor                                            -      16     +16
m_status_print                                       185     195     +10
less_main                                           1656    1663      +7
decode_format_string                                 790     795      +5
test_main                                            403     405      +2
process0_stdin                                       247     249      +2
passwd_main                                         1070    1072      +2
less_gets                                            196     178     -18
buffer_print                                         169      71     -98
less_getch                                           362     138    -224
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 7/3 up/down: 379/-340)           Total: 39 bytes
   text    data     bss     dec     hex filename
 798329     740    7484  806553   c4e99 busybox_old
 798368     740    7484  806592   c4ec0 busybox_unstripped

1 files changed, 26 insertions, 3 deletions

diff --git a/include/libbb.h b/include/libbb.h
index eb8b2f620..873ab8798 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -274,9 +274,32 @@ char *xrealloc_getcwd_or_warn(char *cwd);
 
 char *xmalloc_follow_symlinks(const char *path);
 
-//enum {
-//      BB_SIGS_FATAL = ,
-//};
+enum {
+        /* bb_signals(BB_SIGS_FATAL, handler) catches all signals which
+         * otherwise would kill us, except for those resulting from bugs:
+         * SIGSEGV, SIGILL, SIGFPE.
+         * Other fatal signals not included (TODO?):
+         * SIGBUS   Bus error (bad memory access)
+         * SIGPOLL  Pollable event. Synonym of SIGIO
+         * SIGPROF  Profiling timer expired
+         * SIGSYS   Bad argument to routine
+         * SIGTRAP  Trace/breakpoint trap
+         */
+        BB_SIGS_FATAL = 0
+                + (1 << SIGHUP)
+                + (1 << SIGINT)
+                + (1 << SIGTERM)
+                + (1 << SIGPIPE)   // Write to pipe with no readers
+                + (1 << SIGQUIT)   // Quit from keyboard
+                + (1 << SIGABRT)   // Abort signal from abort(3)
+                + (1 << SIGALRM)   // Timer signal from alarm(2)
+                + (1 << SIGVTALRM) // Virtual alarm clock
+                + (1 << SIGXCPU)   // CPU time limit exceeded
+                + (1 << SIGXFSZ)   // File size limit exceeded
+                + (1 << SIGUSR1)   // Yes kids, these are also fatal!
+                + (1 << SIGUSR2)
+                + 0,
+};
 void bb_signals(int sigs, void (*f)(int));
 /* Unlike signal() and bb_signals, sets handler with sigaction()
  * and in a way that while signal handler is run, no other signals