From 895c08431ff48b9451fa882d508e9f8201396186 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Tue, 28 Jun 2016 19:37:43 +0200
Subject: erts: Save abort reason for erl_child_setup

Nice to have for core dump inspection when stderr -> /dev/null.
---
 erts/emulator/sys/unix/erl_child_setup.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'erts/emulator/sys/unix')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 6beb316350..de61726e5b 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -54,6 +54,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <stdarg.h>
 #include <sys/wait.h>
 
 #define WANT_NONBLOCKING
@@ -79,10 +80,17 @@
 #define DEBUG_PRINT(fmt, ...)
 #endif
 
-#define ABORT(fmt, ...) do {                                            \
-        fprintf(stderr, "erl_child_setup: " fmt "\r\n", ##__VA_ARGS__); \
-        abort();                                                        \
-    } while(0)
+static char abort_reason[200]; /* for core dump inspection */
+
+static void ABORT(const char* fmt, ...)
+{
+    va_list arglist;
+    va_start(arglist, fmt);
+    vsprintf(abort_reason, fmt, arglist);
+    fprintf(stderr, "erl_child_setup: %s\r\n", abort_reason);
+    va_end(arglist);
+    abort();
+}
 
 #ifdef DEBUG
 void
-- 
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