diff --git a/libc/config/linux/aarch64/headers.txt b/libc/config/linux/aarch64/headers.txt
--- a/libc/config/linux/aarch64/headers.txt
+++ b/libc/config/linux/aarch64/headers.txt
@@ -11,6 +11,7 @@
     libc.include.stdlib
     libc.include.string
     libc.include.sys_mman
+    libc.include.sys_socket
     libc.include.sys_syscall
     libc.include.threads
     libc.include.time
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -29,6 +29,7 @@
     libc.include.sys_random
     libc.include.sys_resource
     libc.include.sys_select
+    libc.include.sys_socket
     libc.include.sys_stat
     libc.include.sys_syscall
     libc.include.sys_time
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -361,6 +361,15 @@
     .llvm-libc-types.ssize_t
 )
 
+add_gen_header(
+  sys_socket
+  DEF_FILE sys/socket.h.def
+  GEN_HDR sys/socket.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-macros.sys_socket_macros
+)
+
 add_gen_header(
   sys_syscall
   DEF_FILE sys/syscall.h.def
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -107,6 +107,14 @@
     sys-select-macros.h
 )
 
+add_header(
+  sys_socket_macros
+  HDR
+    sys-socket-macros.h
+  DEPENDS
+    .linux.sys_socket_macros
+)
+
 add_header(
   sys_time_macros
   HDR
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
--- a/libc/include/llvm-libc-macros/linux/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
@@ -28,6 +28,12 @@
     sys-random-macros.h
 )
 
+add_header(
+  sys_socket_macros
+  HDR
+    sys-socket-macros.h
+)
+
 add_header(
   sys_wait_macros
   HDR
diff --git a/libc/include/llvm-libc-macros/linux/sys-socket-macros.h b/libc/include/llvm-libc-macros/linux/sys-socket-macros.h
new file mode 100644
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/sys-socket-macros.h
@@ -0,0 +1,21 @@
+//===-- Definition of macros from sys/socket.h ----------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_LINUX_SYS_SOCKET_MACROS_H
+#define __LLVM_LIBC_MACROS_LINUX_SYS_SOCKET_MACROS_H
+
+// IEEE Std 1003.1-2017 - basedefs/sys_socket.h.html
+// Macro values come from the Linux syscall interface.
+
+#define AF_UNSPEC 0 // Unspecified
+#define AF_UNIX 1   // Unix domain sockets
+#define AF_LOCAL 1  // POSIX name for AF_UNIX
+#define AF_INET 2   // Internet IPv4 Protocol
+#define AF_INET6 10 // IP version 6
+
+#endif // __LLVM_LIBC_MACROS_LINUX_SYS_SOCKET_MACROS_H
diff --git a/libc/include/llvm-libc-macros/sys-socket-macros.h b/libc/include/llvm-libc-macros/sys-socket-macros.h
new file mode 100644
--- /dev/null
+++ b/libc/include/llvm-libc-macros/sys-socket-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/socket.h header file ------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_SYS_SOCKET_MACROS_H
+#define __LLVM_LIBC_MACROS_SYS_SOCKET_MACROS_H
+
+#ifdef __unix__
+#include "linux/sys-socket-macros.h"
+#endif
+
+#endif // __LLVM_LIBC_MACROS_SYS_SOCKET_MACROS_H
diff --git a/libc/include/sys/socket.h.def b/libc/include/sys/socket.h.def
new file mode 100644
--- /dev/null
+++ b/libc/include/sys/socket.h.def
@@ -0,0 +1,18 @@
+//===-- POSIX header sys/socket.h -----------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SYS_SOCKET_H
+#define LLVM_LIBC_SYS_SOCKET_H
+
+#include <__llvm-libc-common.h>
+
+#include <llvm-libc-macros/sys-socket-macros.h>
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_SOCKET_H
diff --git a/libc/spec/linux.td b/libc/spec/linux.td
--- a/libc/spec/linux.td
+++ b/libc/spec/linux.td
@@ -94,6 +94,19 @@
       ]
   >;
 
+  HeaderSpec SysSocket = HeaderSpec<
+      "sys/socket.h",
+      [
+        Macro<"AF_UNSPEC">,
+        Macro<"AF_LOCAL">,
+        Macro<"AF_INET">,
+        Macro<"AF_INET6">,
+      ],
+      [], // Types
+      [], // Enumerations
+      []  // Functions
+  >;
+
   HeaderSpec SysTime = HeaderSpec<
       "sys/time.h",
       [
@@ -155,6 +168,7 @@
     SysMMan,
     SysPrctl,
     SysRandom,
+    SysSocket,
     SysTime,
     Signal,
   ];