split out uint32_t for socklen_t for sys_socket header

include/stdint.h

@@ -50,12 +50,7 @@ typedef __UINT8_TYPE__ u_int8_t;
 typedef __UINT16_TYPE__ uint16_t;
 typedef __UINT16_TYPE__ u_int16_t;
 #endif
-#ifdef __UINT32_TYPE__
-typedef __UINT32_TYPE__ uint32_t;
-typedef __UINT32_TYPE__ u_int32_t;
-// Required by openlibm
-typedef __UINT32_TYPE__ __uint32_t;
-#endif
+#include <bits/uint32-t.h> // for uint32_t
 #ifdef __UINT64_TYPE__
 typedef __UINT64_TYPE__ uint64_t;
 typedef __UINT64_TYPE__ u_int64_t;

src/header/bits_socklen-t/cbindgen.toml

@@ -7,9 +7,9 @@
 # - netdb.h
 # - sys/socket.h (where it should be defined)
 #
-# TODO split out uint32_t to prevent including all of stdint.h
-# stdint needed for uint32_t for socklen_t
-sys_includes = ["stdint.h"]
+# sys/socket.h spec states socklen_t must be at least 32bit wide.
+# Application usage section recommends socklen_t value should not be larger than 2^31 -1.
+sys_includes = ["bits/uint32-t.h"]
 include_guard = "_RELIBC_BITS_SOCKLEN_T_H"
 language = "C"
 no_includes = true

src/header/bits_uint32-t/cbindgen.toml

@@ -0,0 +1,19 @@
+# POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/stdint.h.html
+#
+# This type is split out to prevent importing all of stdint.h in other headers.
+#
+# socklen_t from sys/socket.h requires a 32bit integer even though the spec doesn't state uint32_t specifically
+include_guard = "_RELIBC_BITS_UINT32_T_H"
+after_includes = """
+#ifdef __UINT32_TYPE__
+typedef __UINT32_TYPE__ uint32_t;
+typedef __UINT32_TYPE__ u_int32_t;
+// Required by openlibm
+typedef __UINT32_TYPE__ __uint32_t;
+#endif
+"""
+language = "C"
+no_includes = true
+cpp_compat = true
+[enum]
+prefix_with_name = true

src/header/bits_uint32-t/mod.rs

@@ -0,0 +1,5 @@
+//! `uint32_t` implementation for `stdint.h`.
+//!
+//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/stdint.h.html>.
+//!
+//! Implemented via typedef in cbindgen.

src/header/mod.rs

@@ -62,6 +62,8 @@ pub mod bits_timeval;
 pub mod bits_ucred;
 #[path = "bits_uid-t/mod.rs"]
 pub mod bits_uid_t;
+#[path = "bits_uint32-t/mod.rs"]
+pub mod bits_uint32_t;
 #[path = "bits_useconds-t/mod.rs"]
 pub mod bits_useconds_t;
 pub mod bits_valist;

src/header/sys_socket/cbindgen.toml

@@ -5,10 +5,8 @@
 # - "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>."
 #
-# TODO split out uint32_t from stdint.h in bits/socklen-t.h
-#
 # bits/iovec.h brings in size_t
-# bits/socklen_t brings in stdint.h for uint32_t for socklen_t
+# bits/socklen_t brings in bits/uint32-t.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