[PATCH v2 1/6] mingw: correct exit-code for SIGALRM's SIG_DFL

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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@xxxxxxxxx>
---
 compat/mingw.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index afc892d..78e8f54 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1538,8 +1538,11 @@ 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)
-- 
1.8.0.4.g3c6fb4f.dirty

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