[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

2 files changed, 3 insertions, 2 deletions

diff --git a/pkg/sentry/usage/BUILD b/pkg/sentry/usage/BUILD
index 099315613..8e2b3ed79 100644
--- a/pkg/sentry/usage/BUILD
+++ b/pkg/sentry/usage/BUILD
@@ -18,5 +18,6 @@ go_library(
         "//pkg/bits",
         "//pkg/memutil",
         "//pkg/sync",
+        "@org_golang_x_sys//unix:go_default_library",
     ],
 )
diff --git a/pkg/sentry/usage/memory.go b/pkg/sentry/usage/memory.go
index 5ed6726ab..581862ee2 100644
--- a/pkg/sentry/usage/memory.go
+++ b/pkg/sentry/usage/memory.go
@@ -18,8 +18,8 @@ import (
 	"fmt"
 	"os"
 	"sync/atomic"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/bits"
 	"gvisor.dev/gvisor/pkg/memutil"
 	"gvisor.dev/gvisor/pkg/sync"
@@ -132,7 +132,7 @@ func Init() error {
 	// always be the case for a newly mapped page from /dev/shm. If we obtain
 	// the shared memory through some other means in the future, we may have to
 	// explicitly zero the page.
-	mmap, err := syscall.Mmap(int(file.Fd()), 0, int(RTMemoryStatsSize), syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)
+	mmap, err := unix.Mmap(int(file.Fd()), 0, int(RTMemoryStatsSize), unix.PROT_READ|unix.PROT_WRITE, unix.MAP_SHARED)
 	if err != nil {
 		return fmt.Errorf("error mapping usage file: %v", err)
 	}