[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH glibc] Update hurd/hurdselect.c to be more portable.
|
From: |
Flavio Cruz |
|
Subject: |
[PATCH glibc] Update hurd/hurdselect.c to be more portable. |
|
Date: |
Sat, 6 May 2023 16:55:10 -0400 |
Summary of changes:
- Use BAD_TYPECHECK to perform type checking in a cleaner way.
BAD_TYPECHECK is moved into sysdeps/mach/rpc.h to avoid duplication.
- Remove assertions for mach_msg_type_t since those won't work for
x86_64.
- Update message structs to use mach_msg_type_t directly.
- Use designated initializers.
---
hurd/hurdselect.c | 30 ++++++++++++++----------------
hurd/intr-msg.c | 6 +-----
sysdeps/mach/hurd/ioctl.c | 6 +-----
sysdeps/mach/mach_rpc.h | 31 +++++++++++++++++++++++++++++++
4 files changed, 47 insertions(+), 26 deletions(-)
create mode 100644 sysdeps/mach/mach_rpc.h
diff --git a/hurd/hurdselect.c b/hurd/hurdselect.c
index 08fcc92170..9630cae474 100644
--- a/hurd/hurdselect.c
+++ b/hurd/hurdselect.c
@@ -22,6 +22,7 @@
#include <hurd.h>
#include <hurd/fd.h>
#include <hurd/io_request.h>
+#include <mach_rpc.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
@@ -69,14 +70,6 @@ _hurd_select (int nfds,
sigset_t oset;
struct hurd_sigstate *ss = NULL;
- union typeword /* Use this to avoid unkosher casts. */
- {
- mach_msg_type_t type;
- uint32_t word;
- };
- assert (sizeof (union typeword) == sizeof (mach_msg_type_t));
- assert (sizeof (uint32_t) == sizeof (mach_msg_type_t));
-
if (nfds < 0 || (pollfds == NULL && nfds > FD_SETSIZE))
{
errno = EINVAL;
@@ -404,15 +397,15 @@ _hurd_select (int nfds,
struct
{
mach_msg_header_t head;
- union typeword err_type;
+ mach_msg_type_t err_type;
error_t err;
} error;
struct
{
mach_msg_header_t head;
- union typeword err_type;
+ mach_msg_type_t err_type;
error_t err;
- union typeword result_type;
+ mach_msg_type_t result_type;
int result;
} success;
#endif
@@ -443,9 +436,14 @@ _hurd_select (int nfds,
/* We got a message. Decode it. */
#ifdef MACH_MSG_TYPE_BIT
- const union typeword inttype =
- { type:
- { MACH_MSG_TYPE_INTEGER_T, sizeof (integer_t) * 8, 1, 1, 0, 0 }
+ static const mach_msg_type_t inttype = {
+ .msgt_name = MACH_MSG_TYPE_INTEGER_T,
+ .msgt_size = sizeof (integer_t) * 8,
+ .msgt_number = 1,
+ .msgt_inline = TRUE,
+ .msgt_longform = FALSE,
+ .msgt_deallocate = FALSE,
+ .msgt_unused = 0
};
#endif
@@ -462,7 +460,7 @@ _hurd_select (int nfds,
&& msg.head.msgh_size >= sizeof msg.error
&& !(msg.head.msgh_bits & MACH_MSGH_BITS_COMPLEX)
#ifdef MACH_MSG_TYPE_BIT
- && msg.error.err_type.word == inttype.word
+ && !BAD_TYPECHECK (&msg.error.err_type, &inttype)
#endif
)
{
@@ -480,7 +478,7 @@ _hurd_select (int nfds,
occurred. */
if (msg.error.err
#ifdef MACH_MSG_TYPE_BIT
- || msg.success.result_type.word != inttype.word
+ || BAD_TYPECHECK (&msg.success.result_type, &inttype)
#endif
|| msg.head.msgh_size != sizeof msg.success)
{
diff --git a/hurd/intr-msg.c b/hurd/intr-msg.c
index b535397bfb..bc1f43d383 100644
--- a/hurd/intr-msg.c
+++ b/hurd/intr-msg.c
@@ -17,6 +17,7 @@
<https://www.gnu.org/licenses/>. */
#include <mach.h>
+#include <mach_rpc.h>
#include <mach/mig_errors.h>
#include <mach/mig_support.h>
#include <hurd/signal.h>
@@ -28,11 +29,6 @@
# define mig_reply_header_t mig_reply_error_t
#endif
-/* Macro used by MIG to cleanly check the type. */
-#define BAD_TYPECHECK(type, check) __glibc_unlikely (({ \
- union { mach_msg_type_t t; uint32_t w; } _t, _c; \
- _t.t = *(type); _c.t = *(check);_t.w != _c.w; }))
-
error_t
_hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
mach_msg_option_t option,
diff --git a/sysdeps/mach/hurd/ioctl.c b/sysdeps/mach/hurd/ioctl.c
index 66daaa751e..752cfa60f4 100644
--- a/sysdeps/mach/hurd/ioctl.c
+++ b/sysdeps/mach/hurd/ioctl.c
@@ -28,6 +28,7 @@
#include <stdint.h>
#include <hurd/ioctl.h>
#include <mach/mig_support.h>
+#include <mach_rpc.h>
#include <sysdep-cancel.h>
#include <hurd/ioctls.defs>
@@ -35,11 +36,6 @@
#define msg_align(x) ALIGN_UP (x, __alignof__ (uintptr_t))
#define typesize(type) (1 << (type))
-/* Macro used by MIG to cleanly check the type. */
-#define BAD_TYPECHECK(type, check) __glibc_unlikely (({ \
- union { mach_msg_type_t t; uint32_t w; } _t, _c; \
- _t.t = *(type); _c.t = *(check);_t.w != _c.w; }))
-
/* Perform the I/O control operation specified by REQUEST on FD.
The actual type and use of ARG and the return value depend on REQUEST. */
int
diff --git a/sysdeps/mach/mach_rpc.h b/sysdeps/mach/mach_rpc.h
new file mode 100644
index 0000000000..ff1ee1cae9
--- /dev/null
+++ b/sysdeps/mach/mach_rpc.h
@@ -0,0 +1,31 @@
+/* Macros for handling Mach RPC messages.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <mach/message.h>
+
+/* Macro used by MIG to cleanly check the type. */
+#define BAD_TYPECHECK(type, check) __glibc_unlikely (({ \
+ union { mach_msg_type_t t; uint32_t w; } _t, _c; \
+ _t.t = *(type); _c.t = *(check);_t.w != _c.w; }))
+
+/* TODO: add this assertion for x86_64. */
+#ifndef __x86_64__
+_Static_assert (sizeof (uint32_t) == sizeof (mach_msg_type_t),
+ "mach_msg_type_t needs to be the same size as uint32_t");
+#endif
+
--
2.39.2