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linux: Add ppoll time64 optimization

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It avoid continuing issue the __NR_ppoll_time64 syscall once the kernel
advertise it does not support it.

Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15
kernel).

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Adhemerval Zanella
2020-07-10 13:50:56 -03:00
parent ecdcafa571
commit 60a2e28b34
1 changed files with 13 additions and 5 deletions
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14
sysdeps/unix/sysv/linux/ppoll.c
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@ -22,6 +22,7 @@
#include <sys/poll.h> #include <sys/poll.h>
#include <sysdep-cancel.h> #include <sysdep-cancel.h>
#include <kernel-features.h> #include <kernel-features.h>
#include <time64-support.h>
int int
@ -37,16 +38,23 @@ __ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
timeout = &tval; timeout = &tval;
} }
int ret;
if (supports_time64 ())
{
#ifndef __NR_ppoll_time64 #ifndef __NR_ppoll_time64
# define __NR_ppoll_time64 __NR_ppoll # define __NR_ppoll_time64 __NR_ppoll
#endif #endif
int ret = SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask, ret = SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
__NSIG_BYTES); __NSIG_BYTES);
#ifndef __ASSUME_TIME64_SYSCALLS if (ret == 0 || errno != ENOSYS)
if (ret >= 0 || errno != ENOSYS)
return ret; return ret;
mark_time64_unsupported ();
}
#ifndef __ASSUME_TIME64_SYSCALLS
struct timespec ts32; struct timespec ts32;
if (timeout) if (timeout)
{ {