X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fbreakpoint%2Fbreakpoint.c;fp=ccan%2Fbreakpoint%2Fbreakpoint.c;h=279e29a1dfd1414cd3567766803482c9892972cc;hb=9552c972f725f70ab024e0c9d0487ff078322fd8;hp=0000000000000000000000000000000000000000;hpb=75786a7313a8ac224b7501d5cde841dbda16392e;p=ccan

diff --git a/ccan/breakpoint/breakpoint.c b/ccan/breakpoint/breakpoint.c
new file mode 100644
index 00000000..279e29a1
--- /dev/null
+++ b/ccan/breakpoint/breakpoint.c
@@ -0,0 +1,32 @@
+/* CC0 (Public domain) - see LICENSE file for details
+ *
+ * Idea for implementation thanks to stackoverflow.com:
+ *	http://stackoverflow.com/questions/3596781/detect-if-gdb-is-running
+ */
+#include <ccan/breakpoint/breakpoint.h>
+
+bool breakpoint_initialized;
+bool breakpoint_under_debug;
+
+/* This doesn't get called if we're under GDB. */
+static void trap(int signum)
+{
+	breakpoint_initialized = true;
+}
+
+void breakpoint_init(void)
+{
+	struct sigaction old, new;
+
+	new.sa_handler = trap;
+	new.sa_flags = 0;
+	sigemptyset(&new.sa_mask);
+	sigaction(SIGTRAP, &new, &old);
+	kill(getpid(), SIGTRAP);
+	sigaction(SIGTRAP, &old, NULL);
+
+	if (!breakpoint_initialized) {
+		breakpoint_initialized = true;
+		breakpoint_under_debug = true;
+	}
+}