From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org, Lukasz Majewski <lukma@denx.de>,
Carlos O'Donell <carlos@redhat.com>
Subject: [PATCH 12/18] linux: Only use 64-bit syscall if required for timerfd_settime
Date: Thu, 17 Jun 2021 08:50:58 -0300 [thread overview]
Message-ID: <20210617115104.1359598-13-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20210617115104.1359598-1-adhemerval.zanella@linaro.org>
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall
if the provided timeout fits in a 32-bit one. The 64-bit usage should
be rare since the timeout is a relative one.
Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel
(with and without --enable-kernel=5.1) and on x86_64-linux-gnu.
---
sysdeps/unix/sysv/linux/Makefile | 2 ++
sysdeps/unix/sysv/linux/timerfd_settime.c | 25 ++++++++++---------
sysdeps/unix/sysv/linux/tst-timerfd.c | 29 +++++++++++++++++++++--
3 files changed, 43 insertions(+), 13 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 982755f980..2e5b5e1dc4 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -145,6 +145,8 @@ endif
$(objpfx)tst-ppoll: $(librt)
$(objpfx)tst-ppoll-time64: $(librt)
+$(objpfx)tst-timerfd: $(librt)
+$(objpfx)tst-timerfd-time64: $(librt)
# Generate the list of SYS_* macros for the system calls (__NR_*
# macros). The file syscall-names.list contains all possible system
diff --git a/sysdeps/unix/sysv/linux/timerfd_settime.c b/sysdeps/unix/sysv/linux/timerfd_settime.c
index 0dd6fa026e..8f08133a73 100644
--- a/sysdeps/unix/sysv/linux/timerfd_settime.c
+++ b/sysdeps/unix/sysv/linux/timerfd_settime.c
@@ -29,31 +29,34 @@ __timerfd_settime64 (int fd, int flags, const struct __itimerspec64 *value,
#ifndef __NR_timerfd_settime64
# define __NR_timerfd_settime64 __NR_timerfd_settime
#endif
- int ret = INLINE_SYSCALL_CALL (timerfd_settime64, fd, flags, value, ovalue);
-#ifndef __ASSUME_TIME64_SYSCALLS
- if (ret == 0 || errno != ENOSYS)
- return ret;
- if (! in_time_t_range ((value->it_value).tv_sec)
- || ! in_time_t_range ((value->it_interval).tv_sec))
+#ifdef __ASSUME_TIME64_SYSCALLS
+ return INLINE_SYSCALL_CALL (timerfd_settime64, fd, flags, value, ovalue);
+#else
+ bool is32bit_value = in_time_t_range (value->it_value.tv_sec);
+ bool is32bit_interval = in_time_t_range (value->it_interval.tv_sec);
+ if (!is32bit_value || !is32bit_interval)
{
+ int r = INLINE_SYSCALL_CALL (timerfd_settime64, fd, flags, value,
+ ovalue);
+ if (r == 0 || errno != ENOSYS)
+ return r;
__set_errno (EOVERFLOW);
- return -1;
+ return r;
}
struct itimerspec its32, oits32;
its32.it_interval = valid_timespec64_to_timespec (value->it_interval);
its32.it_value = valid_timespec64_to_timespec (value->it_value);
-
- ret = INLINE_SYSCALL_CALL (timerfd_settime, fd, flags,
- &its32, ovalue ? &oits32 : NULL);
+ int ret = INLINE_SYSCALL_CALL (timerfd_settime, fd, flags,
+ &its32, ovalue != NULL ? &oits32 : NULL);
if (ret == 0 && ovalue != NULL)
{
ovalue->it_interval = valid_timespec_to_timespec64 (oits32.it_interval);
ovalue->it_value = valid_timespec_to_timespec64 (oits32.it_value);
}
-#endif
return ret;
+#endif
}
#if __TIMESIZE != 64
diff --git a/sysdeps/unix/sysv/linux/tst-timerfd.c b/sysdeps/unix/sysv/linux/tst-timerfd.c
index 8828399119..27f1263ac6 100644
--- a/sysdeps/unix/sysv/linux/tst-timerfd.c
+++ b/sysdeps/unix/sysv/linux/tst-timerfd.c
@@ -16,15 +16,18 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <errno.h>
+#include <intprops.h>
#include <time.h>
#include <support/check.h>
+#include <support/support.h>
#include <support/xunistd.h>
#include <support/timespec.h>
#include <sys/time.h>
#include <sys/timerfd.h>
-static int
-do_test (void)
+static void
+timerfd_test (void)
{
struct itimerspec settings = { { 0, 0 }, { 2, 0 } };
struct itimerspec val;
@@ -52,6 +55,28 @@ do_test (void)
/* Check difference between timerfd_gettime calls. */
TEST_COMPARE (support_timespec_check_in_range
((struct timespec) { 1, 0 }, val.it_value, 0.9, 1.0), 1);
+
+ xclose (fd);
+}
+
+static void
+timerfd_large_timeout (void)
+{
+ int fd = timerfd_create (CLOCK_REALTIME, 0);
+ TEST_VERIFY (fd != -1);
+ support_create_timer (0, 100000000, false, NULL);
+ struct itimerspec it = { { 0, 0 }, { TYPE_MAXIMUM (time_t), 0 } };
+ TEST_COMPARE (timerfd_settime (fd, 0, &it, NULL), 0);
+ uint64_t buf;
+ TEST_COMPARE (read (fd, &buf, sizeof (buf)), -1);
+ TEST_VERIFY (errno == EINTR || errno == EOVERFLOW);
+}
+
+static int
+do_test (void)
+{
+ timerfd_test ();
+ timerfd_large_timeout ();
return 0;
}
--
2.30.2
next prev parent reply other threads:[~2021-06-17 11:51 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 11:50 [PATCH 00/18] More y2038 fixes Adhemerval Zanella
2021-06-17 11:50 ` [PATCH 01/18] Use 64 bit time_t stat internally Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-22 19:37 ` Florian Weimer
2021-06-22 19:51 ` Adhemerval Zanella
2021-06-17 11:50 ` [PATCH 02/18] Use LFS and 64 bit time for installed programs Adhemerval Zanella
2021-06-17 12:19 ` Andreas Schwab
2021-06-18 18:50 ` Adhemerval Zanella
2021-06-17 20:49 ` Joseph Myers
2021-06-18 18:14 ` Adhemerval Zanella
2021-06-17 11:50 ` [PATCH 03/18] support: Add support_create_timer Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 04/18] linux: Only use 64-bit syscall if required for ppoll Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 05/18] linux: Only use 64-bit syscall if required for pselect Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 06/18] linux: Only use 64-bit syscall if required for select Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 07/18] linux: Remove supports_time64 () from clock_getres Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 08/18] linux: Remove supports_time64 () from clock_gettime Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 09/18] linux: Remove time64-support Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 10/18] linux: timerfd_gettime minor cleanup Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 11/18] linux: Only use 64-bit syscall if required for semtimedop Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` Adhemerval Zanella [this message]
2021-06-21 7:44 ` [PATCH 12/18] linux: Only use 64-bit syscall if required for timerfd_settime Lukasz Majewski
2021-06-17 11:50 ` [PATCH 13/18] linux: Only use 64-bit syscall if required for mq_timedreceive Adhemerval Zanella
2021-06-21 7:44 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 14/18] linux: Only use 64-bit syscall if required for mq_timedsend Adhemerval Zanella
2021-06-21 7:44 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 15/18] linux: Only use 64-bit syscall if required for sigtimedwait Adhemerval Zanella
2021-06-17 12:25 ` Andreas Schwab
2021-06-22 14:58 ` Adhemerval Zanella
2021-06-17 11:51 ` [PATCH 16/18] linux: Only use 64-bit syscall if required for utimensat family Adhemerval Zanella
2021-06-21 7:45 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 17/18] linux: Only use 64-bit syscall if required for internal futex Adhemerval Zanella
2021-06-21 7:45 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 18/18] linux: Only use 64-bit syscall if required for clock_nanosleep Adhemerval Zanella
2021-06-17 15:11 ` Lukasz Majewski
2021-06-17 17:45 ` Adhemerval Zanella
2021-06-21 7:46 ` Lukasz Majewski
2021-06-17 14:20 ` [PATCH 00/18] More y2038 fixes Lukasz Majewski
2021-06-17 17:41 ` Adhemerval Zanella
2021-06-17 20:58 ` Joseph Myers
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