First commitHEADmaster

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 46 insertions, 0 deletions

diff --git a/sigsegv-recovery.c b/sigsegv-recovery.c
new file mode 100644
index 0000000..b69449b
--- /dev/null
+++ b/sigsegv-recovery.c
@@ -0,0 +1,46 @@
+/* See LICENSE file for copyright and license details. */
+#include <setjmp.h>
+#include <signal.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+
+int *volatile just_null = NULL;
+
+static jmp_buf jmpenv;
+
+
+static void
+sigsegv(int signo)
+{
+	(void) signo;
+
+	siglongjmp(jmpenv, 1);
+}
+
+
+int
+main(void)
+{
+	volatile int sum = 0;
+	volatile int i;
+	struct sigaction sa;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = &sigsegv;
+	sigfillset(&sa.sa_mask);
+	sigaction(SIGSEGV, &sa, NULL);
+
+	for (i = 1; i <= 10; i++) {
+		if (!sigsetjmp(jmpenv, 1)) {
+			printf("%i: before null dereference\n", i);
+			sum += *just_null;
+		} else {
+			printf("%i: after null dereference\n", i);
+		}
+	}
+
+	fflush(stdout);
+	return sum;
+}