From patchwork Mon Nov 11 21:47:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 35807 Received: (qmail 77861 invoked by alias); 11 Nov 2019 21:48:35 -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 77710 invoked by uid 89); 11 Nov 2019 21:48:32 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-20.4 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= X-HELO: mail-out.m-online.net From: Lukasz Majewski To: Joseph Myers , Paul Eggert Cc: Alistair Francis , Alistair Francis , GNU C Library , Adhemerval Zanella , Florian Weimer , Florian Weimer , Zack Weinberg , Carlos O'Donell , Lukasz Majewski Subject: [PATCH 5/5] y2038: linux: Provide __timer_settime64 implementation Date: Mon, 11 Nov 2019 22:47:58 +0100 Message-Id: <20191111214758.3677-6-lukma@denx.de> In-Reply-To: <20191111214758.3677-1-lukma@denx.de> References: <20191111214758.3677-1-lukma@denx.de> MIME-Version: 1.0 This patch provides new __timer_settime64 explicit 64 bit function for setting flags, interval and value of specified timer. Moreover, a 32 bit version - __timer_settime has been refactored to internally use __timer_settime64. The __timer_settime 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 (and opposite when old_value pointer is provided). The new __timer_settime64 syscall available from Linux 5.1+ has been used, when applicable. Build tests: - The code has been tested on x86_64/x86 (native compilation): make PARALLELMFLAGS="-j8" && make check PARALLELMFLAGS="-j8" && \\ make xcheck PARALLELMFLAGS="-j8" - The glibc has been build tested (make PARALLELMFLAGS="-j8") for x86 (i386), x86_64-x32, and armv7 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 - Use of cross-test-ssh.sh for ARM (armv7): make PARALLELMFLAGS="-j8" test-wrapper='./cross-test-ssh.sh root@192.168.7.2' xcheck Linux kernel, headers and minimal kernel version for glibc build test matrix: - Linux v5.1 (with timer_settime64) and glibc build 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 timer_settime64 syscall. - Linux v4.19 (no timer_settime64 support) with default minimal kernel version for contemporary glibc (3.2.0) This kernel doesn't support timer_settime64 syscall, so the fallback to timer_settime is tested. Above tests were performed with Y2038 redirection applied as well as without (so the __TIMESIZE != 64 execution path is checked as well). No regressions were observed. Reviewed-by: Adhemerval Zanella --- include/time.h | 9 ++++ sysdeps/unix/sysv/linux/timer_settime.c | 68 ++++++++++++++++++++++--- 2 files changed, 71 insertions(+), 6 deletions(-) diff --git a/include/time.h b/include/time.h index 8b9a4b7a60..a46fd2f08a 100644 --- a/include/time.h +++ b/include/time.h @@ -186,6 +186,15 @@ extern int __timer_gettime64 (timer_t timerid, struct __itimerspec64 *value); libc_hidden_proto (__timer_gettime64); #endif +#if __TIMESIZE == 64 +# define __timer_settime64 __timer_settime +#else +extern int __timer_settime64 (timer_t timerid, int flags, + const struct __itimerspec64 *value, + struct __itimerspec64 *ovalue); +libc_hidden_proto (__timer_settime64); +#endif + /* Compute the `struct tm' representation of T, offset OFFSET seconds east of UTC, and store year, yday, mon, mday, wday, hour, min, sec into *TP. diff --git a/sysdeps/unix/sysv/linux/timer_settime.c b/sysdeps/unix/sysv/linux/timer_settime.c index 51f24200aa..f847e3e44a 100644 --- a/sysdeps/unix/sysv/linux/timer_settime.c +++ b/sysdeps/unix/sysv/linux/timer_settime.c @@ -20,17 +20,73 @@ #include #include #include +#include #include "kernel-posix-timers.h" int -timer_settime (timer_t timerid, int flags, const struct itimerspec *value, - struct itimerspec *ovalue) +__timer_settime64 (timer_t timerid, int flags, + const struct __itimerspec64 *value, + struct __itimerspec64 *ovalue) { struct timer *kt = (struct timer *) timerid; - /* Delete the kernel timer object. */ - int res = INLINE_SYSCALL (timer_settime, 4, kt->ktimerid, flags, - value, ovalue); +#ifdef __ASSUME_TIME64_SYSCALLS +# ifndef __NR_timer_settime64 +# define __NR_timer_settime64 __NR_timer_settime +# endif + return INLINE_SYSCALL (timer_settime64, 4, kt->ktimerid, flags, value, + ovalue); +#else +# ifdef __NR_timer_settime64 + int ret = INLINE_SYSCALL (timer_settime64, 4, kt->ktimerid, flags, value, + ovalue); + if (ret == 0 || errno != ENOSYS) + return ret; +# endif + struct itimerspec its32, oits32; - return res; + if (! in_time_t_range ((value->it_value).tv_sec) + || ! in_time_t_range ((value->it_interval).tv_sec)) + { + __set_errno (EOVERFLOW); + return -1; + } + + its32.it_interval = valid_timespec64_to_timespec (value->it_interval); + its32.it_value = valid_timespec64_to_timespec (value->it_value); + + int retval = INLINE_SYSCALL (timer_settime, 4, kt->ktimerid, flags, + &its32, ovalue ? &oits32 : NULL); + if (! retval && ovalue) + { + ovalue->it_interval = valid_timespec_to_timespec64 (oits32.it_interval); + ovalue->it_value = valid_timespec_to_timespec64 (oits32.it_value); + } + + return retval; +#endif +} + +#if __TIMESIZE != 64 +int +__timer_settime (timer_t timerid, int flags, const struct itimerspec *value, + struct itimerspec *ovalue) +{ + struct __itimerspec64 its64, oits64; + int retval; + + its64.it_interval = valid_timespec_to_timespec64 (value->it_interval); + its64.it_value = valid_timespec_to_timespec64 (value->it_value); + + retval = __timer_settime64 (timerid, flags, &its64, ovalue ? &oits64 : NULL); + if (! retval && ovalue) + { + ovalue->it_interval = valid_timespec64_to_timespec (oits64.it_interval); + ovalue->it_value = valid_timespec64_to_timespec (oits64.it_value); + } + + return retval; } +#endif +weak_alias (__timer_settime, timer_settime) +libc_hidden_def (timer_settime)