Initial Upload

forktest.c

@@ -0,0 +1,52 @@
+// Test that fork fails gracefully.
+// Tiny executable so that the limit can be filling the proc table.
+
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+#define N  1000
+
+void printf(int fd, const char *s, ...)  {
+    write(fd, s, strlen(s));
+}
+
+void forktest(void)      {
+    int n, pid;
+
+    printf(1, "fork test\n");
+
+    for (n = 0; n < N; n++) {
+        pid = fork();
+        if (pid < 0) {
+            break;
+        }
+        if (pid == 0) {
+            exit();
+        }
+    }
+
+    if (n == N) {
+        printf(1, "fork claimed to work N times!\n", N);
+        exit();
+    }
+
+    for (; n > 0; n--) {
+        if (wait() < 0) {
+            printf(1, "wait stopped early\n");
+            exit();
+        }
+    }
+
+    if (wait() != -1) {
+        printf(1, "wait got too many\n");
+        exit();
+    }
+
+    printf(1, "fork test OK\n");
+}
+
+int main(void)     {
+    forktest();
+    exit();
+}