[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, 4 insertions, 2 deletions

diff --git a/pkg/test/dockerutil/BUILD b/pkg/test/dockerutil/BUILD
index a5e84658a..7f983a0b3 100644
--- a/pkg/test/dockerutil/BUILD
+++ b/pkg/test/dockerutil/BUILD
@@ -22,6 +22,7 @@ go_library(
         "@com_github_docker_docker//client:go_default_library",
         "@com_github_docker_docker//pkg/stdcopy:go_default_library",
         "@com_github_docker_go_connections//nat:go_default_library",
+        "@org_golang_x_sys//unix:go_default_library",
     ],
 )
 
diff --git a/pkg/test/dockerutil/profile.go b/pkg/test/dockerutil/profile.go
index 5cad3e959..4855a52fc 100644
--- a/pkg/test/dockerutil/profile.go
+++ b/pkg/test/dockerutil/profile.go
@@ -20,8 +20,9 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
-	"syscall"
 	"time"
+
+	"golang.org/x/sys/unix"
 )
 
 // profile represents profile-like operations on a container.
@@ -114,7 +115,7 @@ func (p *profile) createProcess(c *Container) error {
 // killProcess kills the process, if running.
 func (p *profile) killProcess() error {
 	if p.cmd != nil && p.cmd.Process != nil {
-		return p.cmd.Process.Signal(syscall.SIGTERM)
+		return p.cmd.Process.Signal(unix.SIGTERM)
 	}
 	return nil
 }