mingw: correct exit-code for SIGALRM's SIG_DFL

Make sure SIG_DFL for SIGALRM exits with 128 + SIGALRM so other
processes can diagnose why it exits.

While we're at it, make sure we only write to stderr if it's a
terminal, and  change the output to match that of Linux.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/compat/mingw.c b/compat/mingw.c
index 4e6383898c59f03127ed698abcb86857d63a8eac..8ae4245648a17381940c06d380dbe3fe4b1fdb3c 100644 (file)
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1560,8 +1560,11 @@ static sig_handler_t timer_fn = SIG_DFL;
 static unsigned __stdcall ticktack(void *dummy)
 {
        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
-               if (timer_fn == SIG_DFL)
-                       die("Alarm");
+               if (timer_fn == SIG_DFL) {
+                       if (isatty(STDERR_FILENO))
+                               fputs("Alarm clock\n", stderr);
+                       exit(128 + SIGALRM);
+               }
                if (timer_fn != SIG_IGN)
                        timer_fn(SIGALRM);
                if (one_shot)