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[24.154.253.225]) by smtp.gmail.com with ESMTPSA id i189-20020a816dc6000000b005463239c01esm241089ywc.51.2023.05.04.21.20.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 May 2023 21:20:41 -0700 (PDT) Date: Fri, 5 May 2023 00:20:39 -0400 To: bug-hurd@gnu.org, libc-alpha@sourceware.org Cc: samuel.thibault@gnu.org Subject: [PATCH glibc] Update hurd/hurdselect.c to be more portable. Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Flavio Cruz via Libc-alpha From: Flavio Cruz Reply-To: Flavio Cruz Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" 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 and rely on BAD_TYPECHECK to do the type checking. - Use designated initializers. --- hurd/hurdselect.c | 34 +++++++++++++++++++--------------- hurd/intr-msg.c | 6 +----- sysdeps/mach/hurd/ioctl.c | 6 +----- sysdeps/mach/mach_rpc.h | 25 +++++++++++++++++++++++++ 4 files changed, 46 insertions(+), 25 deletions(-) create mode 100644 sysdeps/mach/mach_rpc.h diff --git a/hurd/hurdselect.c b/hurd/hurdselect.c index 08fcc92170..13847ac6c0 100644 --- a/hurd/hurdselect.c +++ b/hurd/hurdselect.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -69,13 +70,11 @@ _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)); + /* 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 if (nfds < 0 || (pollfds == NULL && nfds > FD_SETSIZE)) { @@ -404,15 +403,15 @@ _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 +442,14 @@ _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 +466,7 @@ _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 +484,7 @@ _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 @@ . */ #include +#include #include #include #include @@ -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 #include #include +#include #include #include @@ -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..ec267d91e0 --- /dev/null +++ b/sysdeps/mach/mach_rpc.h @@ -0,0 +1,25 @@ +/* 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 + . */ + +#include + +/* 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; })) +