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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-15 21:00:50 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-22 12:09:52 -0300 |
| commit | 4c3df0eba5e8fe98f0de917ade9b2ebba6951c5f (patch) | |
| tree | 137a7ae34464f27fa19029863d4f6f06860e3150 /include/sys | |
| parent | 91cf411ad3ef10bd18ec053854fcb919be4f6789 (diff) | |
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linux: Only use 64-bit syscall if required for select
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. This also avoids the need
to use supports_time64() (which breaks the usage case of live migration
like CRIU or similar).
It also fixes an issue on 32-bit select call for !__ASSUME_PSELECT
(microblase with older kernels only) where the expected timeout
is a 'struct timeval' instead of 'struct timespec'.
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.
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Diffstat (limited to 'include/sys')
| -rw-r--r-- | include/sys/select.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/sys/select.h b/include/sys/select.h index ec073deeba..a8961afbed 100644 --- a/include/sys/select.h +++ b/include/sys/select.h @@ -21,6 +21,11 @@ extern int __pselect32 (int __nfds, fd_set *__readfds, const struct __timespec64 *__timeout, const __sigset_t *__sigmask) attribute_hidden; +extern int __select32 (int __nfds, fd_set *__readfds, + fd_set *__writefds, fd_set *__exceptfds, + const struct __timespec64 *ts64, + struct __timeval64 *timeout) + attribute_hidden; extern int __select64 (int __nfds, fd_set *__readfds, fd_set *__writefds, fd_set *__exceptfds, |