Added signal catching and handling in C and Cython

src/obisig.c

@@ -0,0 +1,31 @@
+/****************************************************************************
+ *  Functions for signal catching and handling                              *
+ ****************************************************************************/
+
+/**
+ * @file obisig.c
+ * @author Celine Mercier (celine.mercier@metabarcoding.org)
+ * @date September 2019
+ * @brief Functions for signal catching and handling.
+ */
+
+#include "obidebug.h"
+#include "obierrno.h"
+#include "obisig.h"
+
+#include <stdbool.h>
+#include <signal.h>
+
+
+#define DEBUG_LEVEL 0	// TODO has to be defined somewhere else (cython compil flag?)
+
+
+bool volatile keep_running = true;
+
+
+void sig_handler(int signum)
+{
+	obi_set_errno(OBI_SIGNAL_CAUGHT);
+	obidebug(1, "\nCaught signal: %s\n", strsignal(signum));
+	keep_running = false;
+}