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* [glibc] y2038: linux: Provide __timer_gettime64 implementation
@ 2019-12-05 23:41 Lukasz Majewski
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From: Lukasz Majewski @ 2019-12-05 23:41 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=562cdc19c761b6749ae31845156366d4b319e200
commit 562cdc19c761b6749ae31845156366d4b319e200
Author: Lukasz Majewski <lukma@denx.de>
Date: Tue Nov 5 17:04:24 2019 +0100
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>
Diff:
---
include/time.h | 7 ++++++
sysdeps/unix/sysv/linux/timer_gettime.c | 44 ++++++++++++++++++++++++++++++---
2 files changed, 47 insertions(+), 4 deletions(-)
diff --git a/include/time.h b/include/time.h
index 1eb3d82..51c0fce 100644
--- a/include/time.h
+++ b/include/time.h
@@ -179,6 +179,13 @@ extern int __futimens64 (int fd, const struct __timespec64 tsp[2]);
libc_hidden_proto (__futimens64);
#endif
+#if __TIMESIZE == 64
+# define __timer_gettime64 __timer_gettime
+#else
+extern int __timer_gettime64 (timer_t timerid, struct __itimerspec64 *value);
+libc_hidden_proto (__timer_gettime64);
+#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_gettime.c b/sysdeps/unix/sysv/linux/timer_gettime.c
index 8d9bef9..20d34db 100644
--- a/sysdeps/unix/sysv/linux/timer_gettime.c
+++ b/sysdeps/unix/sysv/linux/timer_gettime.c
@@ -20,15 +20,51 @@
#include <stdlib.h>
#include <time.h>
#include <sysdep.h>
+#include <kernel-features.h>
#include "kernel-posix-timers.h"
int
-timer_gettime (timer_t timerid, struct itimerspec *value)
+__timer_gettime64 (timer_t timerid, struct __itimerspec64 *value)
{
struct timer *kt = (struct timer *) timerid;
- /* Delete the kernel timer object. */
- int res = INLINE_SYSCALL (timer_gettime, 2, kt->ktimerid, value);
+#ifdef __ASSUME_TIME64_SYSCALLS
+# ifndef __NR_timer_gettime64
+# define __NR_timer_gettime64 __NR_timer_gettime
+# endif
+ return INLINE_SYSCALL_CALL (timer_gettime64, kt->ktimerid, value);
+#else
+# ifdef __NR_timer_gettime64
+ int ret = INLINE_SYSCALL_CALL (timer_gettime64, kt->ktimerid, value);
+ if (ret == 0 || errno != ENOSYS)
+ return ret;
+# endif
+ struct itimerspec its32;
+ int retval = INLINE_SYSCALL_CALL (timer_gettime, kt->ktimerid, &its32);
+ if (retval == 0)
+ {
+ value->it_interval = valid_timespec_to_timespec64 (its32.it_interval);
+ value->it_value = valid_timespec_to_timespec64 (its32.it_value);
+ }
- return res;
+ return retval;
+#endif
}
+
+#if __TIMESIZE != 64
+int
+__timer_gettime (timer_t timerid, struct itimerspec *value)
+{
+ struct __itimerspec64 its64;
+ int retval = __timer_gettime64 (timerid, &its64);
+ if (retval == 0)
+ {
+ value->it_interval = valid_timespec64_to_timespec (its64.it_interval);
+ value->it_value = valid_timespec64_to_timespec (its64.it_value);
+ }
+
+ return retval;
+}
+#endif
+weak_alias (__timer_gettime, timer_gettime)
+libc_hidden_def (timer_gettime)
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