[libc-commits] [libc] [llvm] [libc] Add functions to send/recv messages (PR #106467)

[Michael Jones via libc-commits]

================
@@ -0,0 +1,73 @@
+//===-- Unittests for send/recv -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/socket/recv.h"
+#include "src/sys/socket/send.h"
+#include "src/sys/socket/socketpair.h"
+
+#include "src/unistd/close.h"
+
+#include "src/errno/libc_errno.h"
+#include "test/UnitTest/Test.h"
+
+#include <sys/socket.h> // For AF_UNIX and SOCK_DGRAM
+
+TEST(LlvmLibcSendRecvTest, SucceedsWithSocketPair) {
+  const char TEST_MESSAGE[] = "connection successful";
+  const size_t MESSAGE_LEN = sizeof(TEST_MESSAGE);
+
+  int sockpair[2] = {0, 0};
+
+  int result = LIBC_NAMESPACE::socketpair(AF_UNIX, SOCK_STREAM, 0, sockpair);
+  ASSERT_EQ(result, 0);
+  ASSERT_ERRNO_SUCCESS();
+
+  ssize_t send_result =
+      LIBC_NAMESPACE::send(sockpair[0], TEST_MESSAGE, MESSAGE_LEN, 0);
+  EXPECT_EQ(send_result, static_cast<ssize_t>(MESSAGE_LEN));
+  ASSERT_ERRNO_SUCCESS();
+
+  char buffer[256];
+
+  ssize_t recv_result =
+      LIBC_NAMESPACE::recv(sockpair[1], buffer, sizeof(buffer), 0);
+  ASSERT_EQ(recv_result, static_cast<ssize_t>(MESSAGE_LEN));
+  ASSERT_ERRNO_SUCCESS();
+
+  ASSERT_STREQ(buffer, TEST_MESSAGE);
+
+  // close both ends of the socket
+  result = LIBC_NAMESPACE::close(sockpair[0]);
+  ASSERT_EQ(result, 0);
+  ASSERT_ERRNO_SUCCESS();
+
+  result = LIBC_NAMESPACE::close(sockpair[1]);
+  ASSERT_EQ(result, 0);
+  ASSERT_ERRNO_SUCCESS();
+}
+
+TEST(LlvmLibcSendRecvTest, SendFails) {
+  const char TEST_MESSAGE[] = "connection terminated";
+  const size_t MESSAGE_LEN = sizeof(TEST_MESSAGE);
+
+  ssize_t send_result = LIBC_NAMESPACE::send(-1, TEST_MESSAGE, MESSAGE_LEN, 0);
+  EXPECT_EQ(send_result, ssize_t(-1));
+  ASSERT_ERRNO_FAILURE();
+
+  LIBC_NAMESPACE::libc_errno = 0; // reset errno to avoid test ordering issues.
+}
+
+TEST(LlvmLibcSendRecvTest, RecvFails) {
+  char buffer[256];
+
+  ssize_t recv_result = LIBC_NAMESPACE::recv(-1, buffer, sizeof(buffer), 0);
+  ASSERT_EQ(recv_result, ssize_t(-1));
+  ASSERT_ERRNO_FAILURE();
+
+  LIBC_NAMESPACE::libc_errno = 0; // reset errno to avoid test ordering issues.
----------------
michaelrj-google wrote:

right now we assume that all tests start with `libc_errno = 0`. At some point we should enforce that in our test framework, but that's out of scope for this patch.

https://github.com/llvm/llvm-project/pull/106467