verify sys_socket header includes

src/header/bits_socklen-t/cbindgen.toml

@@ -6,7 +6,10 @@
 # - arpa/inet.h
 # - netdb.h
 # - sys/socket.h (where it should be defined)
-sys_includes = []
+#
+# TODO split out uint32_t to prevent including all of stdint.h
+# stdint needed for uint32_t for socklen_t
+sys_includes = ["stdint.h"]
 include_guard = "_RELIBC_BITS_SOCKLEN_T_H"
 language = "C"
 style = "type"

src/header/sys_socket/cbindgen.toml

@@ -1,5 +1,12 @@
+# POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_socket.h.html
+#
+# Spec quotations relating to includes:
+# - "The <sys/socket.h> header shall define the iovec structure as described in <sys/uio.h>."
+# - "The <sys/socket.h> header shall define the size_t and ssize_t types as described in <sys/types.h>."
+# - "Inclusion of <sys/socket.h> may also make visible all symbols from <sys/uio.h>."
+#
 # bits/iovec.h brings in size_t
-sys_includes = ["stddef.h", "stdint.h"]
+# bits/socklen_t brings in stdint.h for uint32_t for socklen_t
 include_guard = "_RELIBC_SYS_SOCKET_H"
 after_includes = """
 #include <bits/iovec.h>      // for iovec from sys/uio.h