Enable suspending repl with ctrl-z.

natives/hello/Makefile

@@ -18,7 +18,7 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
-CFLAGS=-std=c99 -Wall -Wextra -I../../src/include -s -O3
+CFLAGS=-std=c99 -Wall -Wextra -I../../src/include -O2
 TARGET=hello.so
 
 UNAME:=$(shell uname -s)

src/mainclient/line.c

@@ -81,6 +81,7 @@ https://github.com/antirez/linenoise/blob/master/linenoise.c
 #include <sys/ioctl.h>
 #include <unistd.h>
 #include <string.h>
+#include <signal.h>
 
 #include <headerlibs/vector.h>
 
@@ -349,6 +350,11 @@ static int line() {
             pos = len = 0;
             refresh();
             break;
+        case 26: /* ctrl-z */
+            norawmode();
+            kill(getpid(), SIGSTOP);
+            rawmode();
+            break;
         case 12:
             clear();
             refresh();