[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, 10 insertions, 4 deletions

diff --git a/pkg/procid/BUILD b/pkg/procid/BUILD
index aa3e3ac0b..2838b5aca 100644
--- a/pkg/procid/BUILD
+++ b/pkg/procid/BUILD
@@ -19,7 +19,10 @@ go_test(
         "procid_test.go",
     ],
     library = ":procid",
-    deps = ["//pkg/sync"],
+    deps = [
+        "//pkg/sync",
+        "@org_golang_x_sys//unix:go_default_library",
+    ],
 )
 
 go_test(
@@ -30,5 +33,8 @@ go_test(
         "procid_test.go",
     ],
     library = ":procid",
-    deps = ["//pkg/sync"],
+    deps = [
+        "//pkg/sync",
+        "@org_golang_x_sys//unix:go_default_library",
+    ],
 )
diff --git a/pkg/procid/procid_test.go b/pkg/procid/procid_test.go
index 9ec08c3d6..a08110b35 100644
--- a/pkg/procid/procid_test.go
+++ b/pkg/procid/procid_test.go
@@ -17,9 +17,9 @@ package procid
 import (
 	"os"
 	"runtime"
-	"syscall"
 	"testing"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/sync"
 )
 
@@ -36,7 +36,7 @@ func checkProcid(t *testing.T, start *sync.WaitGroup, done *sync.WaitGroup) {
 	start.Wait()
 
 	procID := Current()
-	tid := syscall.Gettid()
+	tid := unix.Gettid()
 
 	if procID != uint64(tid) {
 		t.Logf("Bad procid: expected %v, got %v", tid, procID)