From 7355c6d9c99d7636c9acbd262149f72d1f900d9f Mon Sep 17 00:00:00 2001
From: kosaki <kosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 21 Feb 2013 05:18:38 +0000
Subject: * signal.c (sigsegv): avoid to use async signal unsafe functions  
 when nested sigsegv is happen.   [Bug #5014] [ruby-dev:44082]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39354 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 signal.c | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

(limited to 'signal.c')

diff --git a/signal.c b/signal.c
index c823347899..4bcb79e389 100644
--- a/signal.c
+++ b/signal.c
@@ -626,10 +626,31 @@ sigbus(int sig SIGINFO_ARG)
 #endif
 
 #ifdef SIGSEGV
+static void ruby_abort(void)
+{
+#ifdef __sun
+    /* Solaris's abort() is async signal unsafe. Of course, it is not
+     *  POSIX compliant.
+     */
+    raise(SIGABRT)
+#else
+    abort();
+#endif
+
+}
+
 static int segv_received = 0;
+extern int ruby_disable_gc_stress;
+
 static RETSIGTYPE
 sigsegv(int sig SIGINFO_ARG)
 {
+    if (segv_received) {
+	char msg[] = "SEGV received in SEGV handler\n";
+	write(2, msg, sizeof(msg));
+	ruby_abort();
+    }
+
 #ifdef USE_SIGALTSTACK
     int ruby_stack_overflowed_p(const rb_thread_t *, const void *);
     NORETURN(void ruby_thread_stack_overflow(rb_thread_t *th));
@@ -638,16 +659,10 @@ sigsegv(int sig SIGINFO_ARG)
 	ruby_thread_stack_overflow(th);
     }
 #endif
-    if (segv_received) {
-	fprintf(stderr, "SEGV received in SEGV handler\n");
-	abort();
-    }
-    else {
-	extern int ruby_disable_gc_stress;
-	segv_received = 1;
-	ruby_disable_gc_stress = 1;
-	rb_bug("Segmentation fault");
-    }
+
+    segv_received = 1;
+    ruby_disable_gc_stress = 1;
+    rb_bug("Segmentation fault");
 }
 #endif
 
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