linenoise: Ctrl-Z: send SIGTSTP to group, not self.

I realized this issue while implementing Ctrl-Z for the pw
(Pipe Watch) program. Sending the SIGTSTP signal just to the
calling process is not enough. Only that process gets
suspended, which results in a weird behavior. It can be
tested like this, for instance:

   txr | tee file

Ctrl-Z must be issued twice: once to sort of suspend txr, and
then again to send it to the tee program. Then the job
actually suspends and the shell prompt appears. With this fix,
the above situation requires only one Ctrl-Z, as expected.

* linenoise/linenoise.c (history_search, show_help, edit):
Don't raise(SIGTSTP), but kill(0, SIGTSTP) to send the suspend
signal to all processes in the process group.

1 files changed, 3 insertions, 3 deletions

diff --git a/linenoise/linenoise.c b/linenoise/linenoise.c
index b3645a18..f09e9b26 100644
--- a/linenoise/linenoise.c
+++ b/linenoise/linenoise.c
@@ -828,7 +828,7 @@ static int history_search(lino_t *l)
                     break;
                 case CTL('Z'):
                     disable_raw_mode(l);
-                    raise(SIGTSTP);
+                    kill(0, SIGTSTP);
                     enable_raw_mode(l);
                 }
             }
@@ -930,7 +930,7 @@ static void show_help(lino_t *l)
             continue;
         case CTL('Z'):
             disable_raw_mode(l);
-            raise(SIGTSTP);
+            kill(0, SIGTSTP);
             enable_raw_mode(l);
             i -= 1;
             continue;
@@ -2526,7 +2526,7 @@ static int edit(lino_t *l, const wchar_t *prompt)
                 if (l->need_refresh)
                     refresh_line(l);
                 disable_raw_mode(l);
-                raise(SIGTSTP);
+                kill(0, SIGTSTP);
                 enable_raw_mode(l);
                 l->maxrows = 0;
                 l->dpos = dpos;