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Jason A. Donenfeld 2a47403f2a unix: always use fstatat(AT_SYMLINK_NOFOLLOW) over lstat on AMD64 
ARM64 does this exact same thing, and in fact this is required on
Android 9, where Bionic now only allows lstat on 32-bit platforms
Folks are running into this when using Android on Chromebooks,
which are keeping AMD64 Android alive. So, we change the AMD64
behavior to model that of ARM64.

Change-Id: Id933cc22b42ab365c12980915557bdbf88661a4d
Reviewed-on: https://go-review.googlesource.com/c/153319
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-12-10 03:00:07 +00:00
Jason A. Donenfeld b0bfa5dc15 unix: always use inotify_init1 over inotify_init on AMD64 
ARM64 does this exact same thing, and in fact this is required on
Android 9, where Bionic now only allows inotify_init on 32-bit
platforms. Folks are running into this when using Android on
Chromebooks, which are keeping AMD64 Android alive. So, we change the
AMD64 behavior to model that of ARM64. However, since Go must run on
kernels between 2.6.27 and 2.6.23, we must still fall back to the
original call.

Fixes: https://lore.kernel.org/wireguard/CALv=V9Gv6apdWJ9P-80zf9bgByd=c3QqPhRHuw6o0_OaH0=W6g@mail.gmail.com
Change-Id: I183e82679cb7d702d12a35457920ccd422176254
Reviewed-on: https://go-review.googlesource.com/c/153318
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-12-10 02:59:51 +00:00
Jason A. Donenfeld cbbc999da3 unix: use pselect on amd64 to satisfy Android 
This is yet another syscall that needs to be changed around for
Android's seccomp. We already do this in MIPS64 and ARM64, but
apparently forgot about AMD64.

Change-Id: I42c8a4653a55d4714dacfaf7add14012f428c992
Reviewed-on: https://go-review.googlesource.com/109835
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-04-27 15:18:31 +00:00
Jason A. Donenfeld a2a45943ae unix: avoid extra syscall on send/recvmsg on Linux 
By simply rearranging the logic, we avoid the overhead of a superfluous
call to getsockopt. For, if p is already non empty, there's no point
in having to check if we need to attach dummy payload. This has
performance benefits when using send/recvmsg for high speed
communications.

Change-Id: If47ab5322464aad8e6d2603a369e95327223211f
Reviewed-on: https://go-review.googlesource.com/108337
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-04-19 22:20:23 +00:00