[libc] Add bind function (#74014)

This patch adds the bind function to go with the socket function. It
also cleans up a lot of socket related data structures.

3 files changed, 73 insertions, 2 deletions

diff --git a/libc/test/src/sys/socket/linux/CMakeLists.txt b/libc/test/src/sys/socket/linux/CMakeLists.txt
index 4380597e5515..666dc28c7e4e 100644
--- a/libc/test/src/sys/socket/linux/CMakeLists.txt
+++ b/libc/test/src/sys/socket/linux/CMakeLists.txt
@@ -12,3 +12,19 @@ add_libc_unittest(
     libc.src.sys.socket.socket
     libc.src.unistd.close
 )
+
+
+add_libc_unittest(
+  bind_test
+  SUITE
+    libc_sys_socket_unittests
+  SRCS
+    bind_test.cpp
+  DEPENDS
+    libc.include.sys_socket
+    libc.src.errno.errno
+    libc.src.sys.socket.socket
+    libc.src.sys.socket.bind
+    libc.src.stdio.remove
+    libc.src.unistd.close
+)
diff --git a/libc/test/src/sys/socket/linux/bind_test.cpp b/libc/test/src/sys/socket/linux/bind_test.cpp
new file mode 100644
index 000000000000..5a3a1c227c9b
--- /dev/null
+++ b/libc/test/src/sys/socket/linux/bind_test.cpp
@@ -0,0 +1,55 @@
+//===-- Unittests for bind ------------------------------------------------===//
+//
+// 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/bind.h"
+#include "src/sys/socket/socket.h"
+
+#include "src/stdio/remove.h"
+#include "src/unistd/close.h"
+
+#include "src/errno/libc_errno.h"
+#include "test/UnitTest/LibcTest.h"
+#include "test/UnitTest/Test.h"
+
+#include <sys/socket.h> // For AF_UNIX and SOCK_DGRAM
+
+TEST(LlvmLibcSocketTest, BindLocalSocket) {
+
+  const char *FILENAME = "bind_file.test";
+  auto SOCK_PATH = libc_make_test_file_path(FILENAME);
+
+  int sock = LIBC_NAMESPACE::socket(AF_UNIX, SOCK_DGRAM, 0);
+  ASSERT_GE(sock, 0);
+  ASSERT_EQ(libc_errno, 0);
+
+  struct sockaddr_un my_addr;
+
+  my_addr.sun_family = AF_UNIX;
+  unsigned int i = 0;
+  for (;
+       SOCK_PATH[i] != '\0' && (i < sizeof(sockaddr_un) - sizeof(sa_family_t));
+       ++i)
+    my_addr.sun_path[i] = SOCK_PATH[i];
+  my_addr.sun_path[i] = '\0';
+
+  // It's important that the path fits in the struct, if it doesn't then we
+  // can't try to bind to the file.
+  ASSERT_LT(
+      i, static_cast<unsigned int>(sizeof(sockaddr_un) - sizeof(sa_family_t)));
+
+  int result =
+      LIBC_NAMESPACE::bind(sock, reinterpret_cast<struct sockaddr *>(&my_addr),
+                           sizeof(struct sockaddr_un));
+
+  ASSERT_EQ(result, 0);
+  ASSERT_EQ(libc_errno, 0);
+
+  LIBC_NAMESPACE::close(sock);
+
+  LIBC_NAMESPACE::remove(SOCK_PATH);
+}
diff --git a/libc/test/src/sys/socket/linux/socket_test.cpp b/libc/test/src/sys/socket/linux/socket_test.cpp
index 9037888441a3..9d5bfacde0a4 100644
--- a/libc/test/src/sys/socket/linux/socket_test.cpp
+++ b/libc/test/src/sys/socket/linux/socket_test.cpp
@@ -13,10 +13,10 @@
 #include "src/errno/libc_errno.h"
 #include "test/UnitTest/Test.h"
 
-#include <sys/socket.h> // For AF_LOCAL and SOCK_DGRAM
+#include <sys/socket.h> // For AF_UNIX and SOCK_DGRAM
 
 TEST(LlvmLibcSocketTest, LocalSocket) {
-  int sock = LIBC_NAMESPACE::socket(AF_LOCAL, SOCK_DGRAM, 0);
+  int sock = LIBC_NAMESPACE::socket(AF_UNIX, SOCK_DGRAM, 0);
   ASSERT_GE(sock, 0);
   ASSERT_EQ(libc_errno, 0);