update name of code to labcodes

labcodes/lab5/user/waitkill.c

@@ -0,0 +1,59 @@
+#include <ulib.h>
+#include <stdio.h>
+
+void
+do_yield(void) {
+    yield();
+    yield();
+    yield();
+    yield();
+    yield();
+    yield();
+}
+
+int parent, pid1, pid2;
+
+void
+loop(void) {
+    cprintf("child 1.\n");
+    while (1);
+}
+
+void
+work(void) {
+    cprintf("child 2.\n");
+    do_yield();
+    if (kill(parent) == 0) {
+        cprintf("kill parent ok.\n");
+        do_yield();
+        if (kill(pid1) == 0) {
+            cprintf("kill child1 ok.\n");
+            exit(0);
+        }
+    }
+    exit(-1);
+}
+
+int
+main(void) {
+    parent = getpid();
+    if ((pid1 = fork()) == 0) {
+        loop();
+    }
+
+    assert(pid1 > 0);
+
+    if ((pid2 = fork()) == 0) {
+        work();
+    }
+    if (pid2 > 0) {
+        cprintf("wait child 1.\n");
+        waitpid(pid1, NULL);
+        panic("waitpid %d returns\n", pid1);
+    }
+    else {
+        kill(pid1);
+    }
+    panic("FAIL: T.T\n");
+}
+