--- libaitio/example/test_exec.c	2013/12/05 16:02:02	1.1.2.4
+++ libaitio/example/test_exec.c	2013/12/06 01:03:02	1.1.2.7
@@ -1,4 +1,7 @@
 #include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
 #include <aitio.h>
 #include <sys/wait.h>
 
@@ -7,7 +10,9 @@ int
 main(int argc, char **argv)
 {
 	prog_t *p;
+	FILE *f;
 	int ret = 0;
+	char str[BUFSIZ];
 
 	if (argc < 2)
 		return 1;
@@ -30,6 +35,35 @@ main(int argc, char **argv)
 		goto end;
 	}
 
+	printf("last=%d\n", array_Last(p->prog_fds));
+
+	ret = io_progGrow(p, 8);
+	printf("+grow_progs=%d\n", ret);
+
+	printf("wait for keystroke %p ", p);
+	getchar();
+
+	ret = io_progVacuum(p, 5);
+	printf("+vacuum_progs=%d\n", ret);
+
+	printf("wait for keystroke %p ", p);
+	getchar();
+
+again:
+	f = io_progAttach(p);
+	printf("f=%p\n", f);
+	while (read(fileno(f), str, sizeof str) > 0) {
+		printf(">>> %s", str);
+		fgets(str, sizeof str, stdin);
+		if (*str == '.')
+			break;
+		write(fileno(f), str, strlen(str));
+	}
+	io_progDetach(p, f);
+
+	printf("wait for keystroke %p ", p);
+	if (getchar() == 'a')
+		goto again;
 end:
 	io_progDestroy(&p);
 	return ret;