From patchwork Tue Feb 11 16:52:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 37974 Received: (qmail 116653 invoked by alias); 11 Feb 2020 16:53:26 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 116538 invoked by uid 89); 11 Feb 2020 16:53:25 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-21.6 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 spammy=Receive X-HELO: mail-out.m-online.net From: Lukasz Majewski To: Joseph Myers , Paul Eggert , Adhemerval Zanella Cc: Alistair Francis , Alistair Francis , GNU C Library , Siddhesh Poyarekar , Florian Weimer , Florian Weimer , Zack Weinberg , Carlos O'Donell , Andreas Schwab , Lukasz Majewski Subject: [PATCH 2/2] y2038: linux: Provide __mq_timedreceive_time64 implementation Date: Tue, 11 Feb 2020 17:52:56 +0100 Message-Id: <20200211165256.21848-2-lukma@denx.de> In-Reply-To: <20200211165256.21848-1-lukma@denx.de> References: <20200211165256.21848-1-lukma@denx.de> MIME-Version: 1.0 This patch provides new __mq_timedreceive_time64 explicit 64 bit function for receiving messages with absolute timeout. Moreover, a 32 bit version - __mq_timedreceive has been refactored to internally use __mq_timedreceive_time64. The __mq_timedreceive is now supposed to be used on systems still supporting 32 bit time (__TIMESIZE != 64) - hence the necessary conversion to 64 bit struct __timespec64 from struct timespec. The new mq_timerdsend_time64 syscall available from Linux 5.1+ has been used, when applicable. As this wrapper function is also used internally in the glibc, to e.g. provide mq_receive implementation, an explicit check for abs_timeout being NULL has been added due to conversions between struct timespec and struct __timespec64. Before this change the Linux kernel handled this NULL pointer. Build tests: - ./src/scripts/build-many-glibcs.py glibcs Run-time tests: - Run specific tests on ARM/x86 32bit systems (qemu): https://github.com/lmajewski/meta-y2038 and run tests: https://github.com/lmajewski/y2038-tests/commits/master Linux kernel, headers and minimal kernel version for glibc build test matrix: - Linux v5.1 (with mq_timedreceive_time64) and glibc built with v5.1 as minimal kernel version (--enable-kernel="5.1.0") The __ASSUME_TIME64_SYSCALLS flag defined. - Linux v5.1 and default minimal kernel version The __ASSUME_TIME64_SYSCALLS not defined, but kernel supports mq_timedreceive_time64 syscall. - Linux v4.19 (no mq_timedreceive_time64 support) with default minimal kernel version for contemporary glibc (3.2.0) This kernel doesn't support mq_timedreceive_time64 syscall, so the fallback to mq_timedreceive is tested. Above tests were performed with Y2038 redirection applied as well as without (so the __TIMESIZE != 64 execution path is checked as well). --- include/mqueue.h | 6 +++ sysdeps/unix/sysv/linux/mq_timedreceive.c | 51 +++++++++++++++++++++-- 2 files changed, 53 insertions(+), 4 deletions(-) diff --git a/include/mqueue.h b/include/mqueue.h index 3de890905c..6479f4fd5c 100644 --- a/include/mqueue.h +++ b/include/mqueue.h @@ -12,11 +12,17 @@ hidden_proto (mq_setattr) # endif #if __TIMESIZE == 64 # define __mq_timedsend_time64 __mq_timedsend +# define __mq_timedreceive_time64 __mq_timedreceive #else #include extern int __mq_timedsend_time64 (mqd_t mqdes, const char *msg_ptr, size_t msg_len, unsigned int msg_prio, const struct __timespec64 *abs_timeout); librt_hidden_proto (__mq_timedsend_time64) +extern ssize_t __mq_timedreceive_time64 (mqd_t mqdes, char *__restrict msg_ptr, + size_t msg_len, + unsigned int *__restrict msg_prio, + const struct __timespec64 *__restrict abs_timeout); +librt_hidden_proto (__mq_timedreceive_time64) #endif #endif diff --git a/sysdeps/unix/sysv/linux/mq_timedreceive.c b/sysdeps/unix/sysv/linux/mq_timedreceive.c index 73a1d63e41..58cfe15db9 100644 --- a/sysdeps/unix/sysv/linux/mq_timedreceive.c +++ b/sysdeps/unix/sysv/linux/mq_timedreceive.c @@ -22,13 +22,56 @@ /* Receive the oldest from highest priority messages in message queue MQDES, stop waiting if ABS_TIMEOUT expires. */ ssize_t -__mq_timedreceive (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len, - unsigned int *__restrict msg_prio, - const struct timespec *__restrict abs_timeout) +__mq_timedreceive_time64 (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len, + unsigned int *__restrict msg_prio, + const struct __timespec64 *__restrict abs_timeout) { +#ifdef __ASSUME_TIME64_SYSCALLS +# ifndef __NR_mq_timedreceive_time64 +# define __NR_mq_timedreceive_time64 __NR_mq_timedreceive +# endif + return SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len, + msg_prio, abs_timeout); +#else + int ret = SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len, + msg_prio, abs_timeout); + if (ret == 0 || errno != ENOSYS) + return ret; + + struct timespec ts32; + if (abs_timeout) + { + if (! in_time_t_range (abs_timeout->tv_sec)) + { + __set_errno (EOVERFLOW); + return -1; + } + + ts32 = valid_timespec64_to_timespec (*abs_timeout); + } + return SYSCALL_CANCEL (mq_timedreceive, mqdes, msg_ptr, msg_len, msg_prio, - abs_timeout); + abs_timeout ? &ts32 : NULL); +#endif +} + +#if __TIMESIZE != 64 +librt_hidden_def (__mq_timedreceive_time64) + +ssize_t +__mq_timedreceive (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len, + unsigned int *__restrict msg_prio, + const struct timespec *__restrict abs_timeout) +{ + struct __timespec64 ts64; + if (abs_timeout) + ts64 = valid_timespec_to_timespec64 (*abs_timeout); + + return __mq_timedreceive_time64 (mqdes, msg_ptr, msg_len, msg_prio, + abs_timeout ? &ts64 : NULL); } +#endif + hidden_def (__mq_timedreceive) weak_alias (__mq_timedreceive, mq_timedreceive) hidden_weak (mq_timedreceive)