From 3e23660e89dd726ba4155c6f774fdb0c4cfbd95e Mon Sep 17 00:00:00 2001
From: Kevin Burke <kevin.burke@segment.com>
Date: Thu, 21 Apr 2022 16:34:21 -0700
Subject: [PATCH] go.mod: update /x/sys to latest version

It has some new bug fixes we can use.

Also replace a use of the "syscall" package with the x/sys/unix
package, which has a compatible API.
---
 go.mod                         |  4 ++--
 go.sum                         |  4 ++--
 internal/buffer/buffer_mmap.go | 15 +++++++++------
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/go.mod b/go.mod
index 912ec016..e63db00c 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/segmentio/asm
 
-go 1.17
+go 1.18
 
-require golang.org/x/sys v0.0.0-20211110154304-99a53858aa08
+require golang.org/x/sys v0.0.0-20220412211240-33da011f77ad
diff --git a/go.sum b/go.sum
index f000ecc3..7f2d82d5 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-golang.org/x/sys v0.0.0-20211110154304-99a53858aa08 h1:WecRHqgE09JBkh/584XIE6PMz5KKE/vER4izNUi30AQ=
-golang.org/x/sys v0.0.0-20211110154304-99a53858aa08/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220412211240-33da011f77ad h1:ntjMns5wyP/fN65tdBD4g8J5w8n015+iIIs9rtjXkY0=
+golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
diff --git a/internal/buffer/buffer_mmap.go b/internal/buffer/buffer_mmap.go
index d23a2d9f..57a6489f 100644
--- a/internal/buffer/buffer_mmap.go
+++ b/internal/buffer/buffer_mmap.go
@@ -2,10 +2,13 @@
 // +build !purego
 // +build aix android darwin dragonfly freebsd illumos ios linux netbsd openbsd plan9 solaris
 
+// TODO: replace the above with go:build unix once Go 1.19 is the lowest
+// supported version
+
 package buffer
 
 import (
-	"syscall"
+	"golang.org/x/sys/unix"
 )
 
 type Buffer struct {
@@ -15,18 +18,18 @@ type Buffer struct {
 }
 
 func New(n int) (Buffer, error) {
-	pg := syscall.Getpagesize()
+	pg := unix.Getpagesize()
 	full := ((n+(pg-1))/pg + 2) * pg
 
-	b, err := syscall.Mmap(-1, 0, full, syscall.PROT_NONE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
+	b, err := unix.Mmap(-1, 0, full, unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
 	if err != nil {
 		return Buffer{}, err
 	}
 
 	if n > 0 {
-		err = syscall.Mprotect(b[pg:full-pg], syscall.PROT_READ|syscall.PROT_WRITE)
+		err = unix.Mprotect(b[pg:full-pg], unix.PROT_READ|unix.PROT_WRITE)
 		if err != nil {
-			syscall.Munmap(b)
+			unix.Munmap(b)
 			return Buffer{}, err
 		}
 	}
@@ -49,5 +52,5 @@ func (a *Buffer) ProtectTail() []byte {
 }
 
 func (a *Buffer) Release() {
-	syscall.Munmap(a.mmap)
+	unix.Munmap(a.mmap)
 }