[op] Replace syscall package usage with golang.org/x/sys/unix in pkg/.

The syscall package has been deprecated in favor of golang.org/x/sys.

Note that syscall is still used in the following places:
- pkg/sentry/socket/hostinet/stack.go: some netlink related functionalities
  are not yet available in golang.org/x/sys.
- syscall.Stat_t is still used in some places because os.FileInfo.Sys() still
  returns it and not unix.Stat_t.

Updates #214

PiperOrigin-RevId: 360701387

1 files changed, 4 insertions, 3 deletions

diff --git a/pkg/usermem/usermem_arm64.go b/pkg/usermem/usermem_arm64.go
index fdfc30a66..7e7529585 100644
--- a/pkg/usermem/usermem_arm64.go
+++ b/pkg/usermem/usermem_arm64.go
@@ -18,13 +18,14 @@ package usermem
 
 import (
 	"encoding/binary"
-	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 const (
 	// PageSize is the system page size.
 	// arm64 support 4K/16K/64K page size,
-	// which can be get by syscall.Getpagesize().
+	// which can be get by unix.Getpagesize().
 	// Currently, only 4K page size is supported.
 	PageSize = 1 << PageShift
 
@@ -47,7 +48,7 @@ var (
 
 func init() {
 	// Make sure the page size is 4K on arm64 platform.
-	if size := syscall.Getpagesize(); size != PageSize {
+	if size := unix.Getpagesize(); size != PageSize {
 		panic("Only 4K page size is supported on arm64!")
 	}
 }