add key_t to sys_types, cleanup sys_ipc and sys_shm

src/header/sys_ipc/cbindgen.toml

@@ -1,14 +1,13 @@
 # POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_ipc.h.html
 #
 # Spec quotations relating to includes:
-# - The <sys/ipc.h> header shall define the uid_t, gid_t, mode_t, and key_t types as described in <sys/types.h>
-sys_includes = []
+# - "The <sys/ipc.h> header shall define the uid_t, gid_t, mode_t, and key_t types as described in <sys/types.h>."
 include_guard = "_RELIBC_SYS_IPC_H"
 after_includes = """
 #include <bits/gid-t.h>  // for gid_t from sys/types.h
 #include <bits/uid-t.h>  // for uid_t from sys/types.h
 #include <bits/key-t.h>  // for key_t from sys/types.h
-#include <bits/mode-t.h>  // for mode_t from sys/types.h
+#include <bits/mode-t.h> // for mode_t from sys/types.h
 """
 language = "C"
 style = "Tag"

src/header/sys_ipc/mod.rs

@@ -13,15 +13,22 @@ pub const IPC_R: u32 = 0o400;
 pub const IPC_W: u32 = 0o200;
 pub const IPC_M: u32 = 0o10000;
 
+/// Remove identifier.
 pub const IPC_RMID: i32 = 0;
+/// Set options.
 pub const IPC_SET: i32 = 1;
+/// Get options.
 pub const IPC_STAT: i32 = 2;
 // pub const IPC_INFO: i32 = 3; non posix unimplemented
 
+/// Create entry if key does not exist.
 pub const IPC_CREAT: i32 = 0o1000;
+/// Fail if key exists.
 pub const IPC_EXCL: i32 = 0o2000;
+/// Error if request would need to wait.
 pub const IPC_NOWAIT: i32 = 0o4000;
 
+/// Private key.
 pub const IPC_PRIVATE: key_t = 0;
 
 #[repr(C)]
@@ -50,7 +57,7 @@ pub unsafe extern "C" fn ftok(path: *const c_char, id: c_int) -> key_t {
     }
 
     // Borrowed from musl
-    return (stat.st_ino & 0xffff) as key_t
+    (stat.st_ino & 0xffff) as key_t
         | ((stat.st_dev & 0xff) << 16) as key_t
-        | ((id & 0xff) << 24);
+        | ((id & 0xff) << 24)
 }