Merge branch 'threads'

This branch adds initial support for multithreaded targets, as well as
forking and exec syscalls.  All of the bugs from initial testing are
fixed so far.

* threads: (25 commits)
  Don't spin waiting to interrupt zombie process
  Allow termination and exec events to propagate immediately
  Implement support for PTRACE_EVENT_FORK and ui
  Handle PTRACE_EVENT_EXIT to capture a final state snapshot
  Detect out-of-band thread exec state changes to prevent deadlock
  Enable user creation of thread-specific breakpoints
  Add orig_rax to register display
  Tweak SCHEDULER_DELAY for use with installing breakpoints
  Ignore breakpoints during singlestep
  Fix bug with cleaning temporary breakpoints
  Independent thread control refactor
  Multithread version 3
  Add strict_strtoul
  Prevent lingering traps after detach
  Handle PTRACE_EVENT_EXEC
  Workaround SIGSTOP on child process startup
  setpgid is redundant with setsid and causes an error
  Display name of pending signal
  dbg_realcont for testing purposes
  Display installed status of breakpoints
  ...

1 files changed, 5 insertions, 0 deletions

diff --git a/helpers.h b/helpers.h
index f01e024..a415a6c 100644
--- a/helpers.h
+++ b/helpers.h
@@ -4,7 +4,10 @@
 #include <panel.h>
 #include <stddef.h>
 
+#define KEY_ESCAPE 0x1b
+
 extern void *xmalloc(size_t size);
+extern unsigned long strict_strtoul(const char *nptr, int base);
 
 extern void cursinit(void);
 extern void cursupdate(void);
@@ -13,3 +16,5 @@ extern void delpan(PANEL *pan);
 extern void reset_panel(PANEL *pan, int h, int w, int y, int x);
 extern int pprintw(PANEL *pan, const char *fmt, ...);
 extern int pclear(PANEL *pan);
+extern int pattron(PANEL *pan, int attrs);
+extern int pattroff(PANEL *pan, int attrs);