[libc-commits] [libc] [libc] Support for argument-taking ptrace requests (PR #201830)

[Jeff Bailey via libc-commits]

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@@ -42,12 +45,33 @@ void trace_me_test() {
   ASSERT_TRUE(WIFSTOPPED(status));
   ASSERT_EQ(WSTOPSIG(status), SIGSTOP);
 
-  // Kill the child
-  ASSERT_EQ(LIBC_NAMESPACE::kill(pid, SIGKILL), 0);
+  // Try reading from an invalid address, and check for failure.
+  ASSERT_EQ(-1,
+            LIBC_NAMESPACE::ptrace(PTRACE_PEEKDATA, pid,
+                                   reinterpret_cast<void *>(0x470), nullptr));
+  ASSERT_ERRNO_EQ(EIO);
+
+  errno = 0;
+  // We're reading the value of test_variable from the child process. As the
+  // child is a fork our ourselves, the variable will have the same address in
----------------
kaladron wrote:

```suggestion
  // child is a fork of ourselves, the variable will have the same address in
```

https://github.com/llvm/llvm-project/pull/201830