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* [glibc/azanella/y2038] linux: Add ppoll time64 optimization
@ 2020-07-30 13:25 Adhemerval Zanella
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From: Adhemerval Zanella @ 2020-07-30 13:25 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e118ad3ca4f48502ed686fb6ee35c0eccdb21cea
commit e118ad3ca4f48502ed686fb6ee35c0eccdb21cea
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri Jul 10 13:50:56 2020 -0300
linux: Add ppoll time64 optimization
It avoid issues the __NR_ppoll_time64 syscall if the kernel does not
support it.
Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15
kernel).
Diff:
---
sysdeps/unix/sysv/linux/ppoll.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/ppoll.c b/sysdeps/unix/sysv/linux/ppoll.c
index 079d56b5eb..c4e5b0e733 100644
--- a/sysdeps/unix/sysv/linux/ppoll.c
+++ b/sysdeps/unix/sysv/linux/ppoll.c
@@ -22,7 +22,7 @@
#include <sys/poll.h>
#include <sysdep-cancel.h>
#include <kernel-features.h>
-
+#include <time64-support.h>
int
__ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
@@ -40,13 +40,20 @@ __ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
#ifndef __NR_ppoll_time64
# define __NR_ppoll_time64 __NR_ppoll
#endif
- int ret = SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
+ int ret;
+
+ if (supports_time64 ())
+ {
+ ret = SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
__NSIG_BYTES);
-#ifdef __ASSUME_TIME64_SYSCALLS
- if (ret >= 0 || errno != ENOSYS)
- return ret;
+ if (ret == 0 || errno != ENOSYS)
+ return ret;
+
+ mark_time64_unsupported ();
+ }
+#ifndef __ASSUME_TIME64_SYSCALLS
struct timespec ts32;
if (timeout)
{
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