kill/status test

user/usertests.c

@@ -779,6 +779,36 @@ pipe1(char *s)
   }
 }
 
+
+// test if child is killed (status = -1)
+void
+killstatus(char *s)
+{
+  int xst;
+
+  for(int i = 0; i < 100; i++){
+    int pid1 = fork();
+    if(pid1 < 0){
+      printf("%s: fork failed\n", s);
+      exit(1);
+    }
+    if(pid1 == 0){
+      for (int j = 0; j < 1000; j++) {
+        getpid();
+      }
+      exit(0);
+    }
+    sleep(1);
+    kill(pid1);
+    wait(&xst);
+    if(xst != -1) {
+       printf("%s: status should be -1\n", s);
+       exit(1);
+    }
+  }
+  exit(0);
+}
+
 // meant to be run w/ at most two CPUs
 void
 preempt(char *s)
@@ -2786,6 +2816,7 @@ main(int argc, char *argv[])
     {iputtest, "iput"},
     {mem, "mem"},
     {pipe1, "pipe1"},
+    {killstatus, "killstatus"},
     {preempt, "preempt"},
     {exitwait, "exitwait"},
     {rmdot, "rmdot"},