From d3bc79bc8438206ac6a14fde4eaa288fc07eee82 Mon Sep 17 00:00:00 2001
From: Brian Geffon <bgeffon@google.com>
Date: Mon, 10 Dec 2018 14:41:40 -0800
Subject: Open source system call tests.

PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22
---
 test/util/logging.cc | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 test/util/logging.cc

(limited to 'test/util/logging.cc')

diff --git a/test/util/logging.cc b/test/util/logging.cc
new file mode 100644
index 000000000..86ea71df3
--- /dev/null
+++ b/test/util/logging.cc
@@ -0,0 +1,97 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "test/util/logging.h"
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+// We implement this here instead of using test_util to avoid cyclic
+// dependencies.
+int Write(int fd, const char* buf, size_t size) {
+  size_t written = 0;
+  while (written < size) {
+    int res = write(fd, buf + written, size - written);
+    if (res < 0 && errno == EINTR) {
+      continue;
+    } else if (res <= 0) {
+      break;
+    }
+
+    written += res;
+  }
+  return static_cast<int>(written);
+}
+
+// Write 32-bit decimal number to fd.
+int WriteNumber(int fd, uint32_t val) {
+  constexpr char kDigits[] = "0123456789";
+  constexpr int kBase = 10;
+
+  // 10 chars for 32-bit number in decimal, 1 char for the NUL-terminator.
+  constexpr int kBufferSize = 11;
+  char buf[kBufferSize];
+
+  // Convert the number to std::string.
+  char* s = buf + sizeof(buf) - 1;
+  size_t size = 0;
+
+  *s = '\0';
+  do {
+    s--;
+    size++;
+
+    *s = kDigits[val % kBase];
+    val /= kBase;
+  } while (val);
+
+  return Write(fd, s, size);
+}
+
+}  // namespace
+
+void CheckFailure(const char* cond, size_t cond_size, const char* msg,
+                  size_t msg_size, bool include_errno) {
+  int saved_errno = errno;
+
+  constexpr char kCheckFailure[] = "Check failed: ";
+  Write(2, kCheckFailure, sizeof(kCheckFailure) - 1);
+  Write(2, cond, cond_size);
+
+  if (msg != nullptr) {
+    Write(2, ": ", 2);
+    Write(2, msg, msg_size);
+  }
+
+  if (include_errno) {
+    constexpr char kErrnoMessage[] = " (errno ";
+    Write(2, kErrnoMessage, sizeof(kErrnoMessage) - 1);
+    WriteNumber(2, saved_errno);
+    Write(2, ")", 1);
+  }
+
+  Write(2, "\n", 1);
+
+  abort();
+}
+
+}  // namespace testing
+}  // namespace gvisor
-- 
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