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Update hurd/hurdselect.c to be more portable.
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. Message-Id: <ZFa+roan3ioo0ONM@jupiter.tail36e24.ts.net>
This commit is contained in:
Flavio Cruz
Samuel Thibault
parent
e64b7c26d4
commit
84b4a81aeb
@ -22,6 +22,7 @@
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#include <hurd.h>
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#include <hurd/fd.h>
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#include <hurd/io_request.h>
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#include <mach_rpc.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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@ -69,14 +70,6 @@ _hurd_select (int nfds,
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sigset_t oset;
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struct hurd_sigstate *ss = NULL;
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union typeword /* Use this to avoid unkosher casts. */
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{
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mach_msg_type_t type;
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uint32_t word;
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};
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assert (sizeof (union typeword) == sizeof (mach_msg_type_t));
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assert (sizeof (uint32_t) == sizeof (mach_msg_type_t));
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if (nfds < 0 || (pollfds == NULL && nfds > FD_SETSIZE))
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{
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errno = EINVAL;
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@ -404,15 +397,15 @@ _hurd_select (int nfds,
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struct
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{
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mach_msg_header_t head;
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union typeword err_type;
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mach_msg_type_t err_type;
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error_t err;
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} error;
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struct
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{
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mach_msg_header_t head;
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union typeword err_type;
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mach_msg_type_t err_type;
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error_t err;
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union typeword result_type;
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mach_msg_type_t result_type;
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int result;
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} success;
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#endif
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@ -443,9 +436,14 @@ _hurd_select (int nfds,
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/* We got a message. Decode it. */
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#ifdef MACH_MSG_TYPE_BIT
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const union typeword inttype =
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{ type:
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{ MACH_MSG_TYPE_INTEGER_T, sizeof (integer_t) * 8, 1, 1, 0, 0 }
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static const mach_msg_type_t inttype = {
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.msgt_name = MACH_MSG_TYPE_INTEGER_T,
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.msgt_size = sizeof (integer_t) * 8,
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.msgt_number = 1,
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.msgt_inline = TRUE,
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.msgt_longform = FALSE,
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.msgt_deallocate = FALSE,
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.msgt_unused = 0
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};
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#endif
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@ -462,7 +460,7 @@ _hurd_select (int nfds,
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&& msg.head.msgh_size >= sizeof msg.error
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&& !(msg.head.msgh_bits & MACH_MSGH_BITS_COMPLEX)
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#ifdef MACH_MSG_TYPE_BIT
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&& msg.error.err_type.word == inttype.word
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&& !BAD_TYPECHECK (&msg.error.err_type, &inttype)
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#endif
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)
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{
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@ -480,7 +478,7 @@ _hurd_select (int nfds,
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occurred. */
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if (msg.error.err
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#ifdef MACH_MSG_TYPE_BIT
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|| msg.success.result_type.word != inttype.word
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|| BAD_TYPECHECK (&msg.success.result_type, &inttype)
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#endif
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|| msg.head.msgh_size != sizeof msg.success)
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{
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@ -17,6 +17,7 @@
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<https://www.gnu.org/licenses/>. */
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#include <mach.h>
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#include <mach_rpc.h>
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#include <mach/mig_errors.h>
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#include <mach/mig_support.h>
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#include <hurd/signal.h>
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@ -28,11 +29,6 @@
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# define mig_reply_header_t mig_reply_error_t
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#endif
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/* Macro used by MIG to cleanly check the type. */
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#define BAD_TYPECHECK(type, check) __glibc_unlikely (({ \
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union { mach_msg_type_t t; uint32_t w; } _t, _c; \
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_t.t = *(type); _c.t = *(check);_t.w != _c.w; }))
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error_t
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_hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
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mach_msg_option_t option,
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@ -28,6 +28,7 @@
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#include <stdint.h>
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#include <hurd/ioctl.h>
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#include <mach/mig_support.h>
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#include <mach_rpc.h>
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#include <sysdep-cancel.h>
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#include <hurd/ioctls.defs>
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@ -35,11 +36,6 @@
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#define msg_align(x) ALIGN_UP (x, __alignof__ (uintptr_t))
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#define typesize(type) (1 << (type))
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/* Macro used by MIG to cleanly check the type. */
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#define BAD_TYPECHECK(type, check) __glibc_unlikely (({ \
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union { mach_msg_type_t t; uint32_t w; } _t, _c; \
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_t.t = *(type); _c.t = *(check);_t.w != _c.w; }))
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/* Perform the I/O control operation specified by REQUEST on FD.
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The actual type and use of ARG and the return value depend on REQUEST. */
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int
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30
sysdeps/mach/mach_rpc.h
Normal file
30
sysdeps/mach/mach_rpc.h
Normal file
@ -0,0 +1,30 @@
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/* Macros for handling Mach RPC messages.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <mach/message.h>
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/* Macro used by MIG to cleanly check the type. */
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#define BAD_TYPECHECK(type, check) __glibc_unlikely (({ \
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union { mach_msg_type_t t; uint32_t w; } _t, _c; \
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_t.t = *(type); _c.t = *(check);_t.w != _c.w; }))
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/* TODO: add this assertion for x86_64. */
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#ifndef __x86_64__
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_Static_assert (sizeof (uint32_t) == sizeof (mach_msg_type_t),
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"mach_msg_type_t needs to be the same size as uint32_t");
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#endif
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