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y2038: linux: Provide __timer_gettime64 implementation
This patch provides new __timer_gettime64 explicit 64 bit function for reading status of specified timer. To be more precise - the remaining time and interval set with timer_settime. Moreover, a 32 bit version - __timer_gettime has been refactored to internally use __timer_gettime64. The __timer_gettime is now supposed to be used on systems still supporting 32 bit time (__TIMESIZE != 64) - hence the necessary conversion from 64 bit struct __timespec64 to struct timespec. The new __timer_gettime64 syscall available from Linux 5.1+ has been used, when applicable. The original INLINE_SYSCALL() macro has been replaced with INLINE_SYSCALL_CALL() to avoid explicit passing the number of arguments. 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_gettime64) 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_gettime64 syscall. - Linux v4.19 (no timer_gettime64 support) with default minimal kernel version for contemporary glibc (3.2.0) This kernel doesn't support timer_gettime64 syscall, so the fallback to timer_gettime 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 <adhemerval.zanella@linaro.org>
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@ -179,6 +179,13 @@ extern int __futimens64 (int fd, const struct __timespec64 tsp[2]);
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libc_hidden_proto (__futimens64);
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#endif
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#if __TIMESIZE == 64
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# define __timer_gettime64 __timer_gettime
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#else
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extern int __timer_gettime64 (timer_t timerid, struct __itimerspec64 *value);
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libc_hidden_proto (__timer_gettime64);
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#endif
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/* Compute the `struct tm' representation of T,
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offset OFFSET seconds east of UTC,
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and store year, yday, mon, mday, wday, hour, min, sec into *TP.
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@ -20,15 +20,51 @@
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#include <stdlib.h>
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#include <time.h>
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#include <sysdep.h>
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#include <kernel-features.h>
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#include "kernel-posix-timers.h"
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int
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timer_gettime (timer_t timerid, struct itimerspec *value)
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__timer_gettime64 (timer_t timerid, struct __itimerspec64 *value)
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{
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struct timer *kt = (struct timer *) timerid;
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/* Delete the kernel timer object. */
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int res = INLINE_SYSCALL (timer_gettime, 2, kt->ktimerid, value);
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#ifdef __ASSUME_TIME64_SYSCALLS
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# ifndef __NR_timer_gettime64
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# define __NR_timer_gettime64 __NR_timer_gettime
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# endif
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return INLINE_SYSCALL_CALL (timer_gettime64, kt->ktimerid, value);
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#else
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# ifdef __NR_timer_gettime64
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int ret = INLINE_SYSCALL_CALL (timer_gettime64, kt->ktimerid, value);
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if (ret == 0 || errno != ENOSYS)
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return ret;
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# endif
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struct itimerspec its32;
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int retval = INLINE_SYSCALL_CALL (timer_gettime, kt->ktimerid, &its32);
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if (retval == 0)
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{
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value->it_interval = valid_timespec_to_timespec64 (its32.it_interval);
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value->it_value = valid_timespec_to_timespec64 (its32.it_value);
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}
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return res;
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return retval;
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#endif
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}
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#if __TIMESIZE != 64
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int
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__timer_gettime (timer_t timerid, struct itimerspec *value)
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{
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struct __itimerspec64 its64;
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int retval = __timer_gettime64 (timerid, &its64);
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if (retval == 0)
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{
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value->it_interval = valid_timespec64_to_timespec (its64.it_interval);
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value->it_value = valid_timespec64_to_timespec (its64.it_value);
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}
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return retval;
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}
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#endif
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weak_alias (__timer_gettime, timer_gettime)
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libc_hidden_def (timer_gettime)
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