[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, 3 deletions

diff --git a/pkg/sentry/state/BUILD b/pkg/sentry/state/BUILD
index 563d60578..3e801182c 100644
--- a/pkg/sentry/state/BUILD
+++ b/pkg/sentry/state/BUILD
@@ -21,5 +21,6 @@ go_library(
         "//pkg/sentry/watchdog",
         "//pkg/state/statefile",
         "//pkg/syserror",
+        "@org_golang_x_sys//unix:go_default_library",
     ],
 )
diff --git a/pkg/sentry/state/state_unsafe.go b/pkg/sentry/state/state_unsafe.go
index d271c6fc9..a3da028c4 100644
--- a/pkg/sentry/state/state_unsafe.go
+++ b/pkg/sentry/state/state_unsafe.go
@@ -16,17 +16,17 @@ package state
 
 import (
 	"fmt"
-	"syscall"
 	"time"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 )
 
 // CPUTime returns the CPU time usage by Sentry and app.
 func CPUTime() (time.Duration, error) {
-	var ts syscall.Timespec
-	_, _, errno := syscall.RawSyscall(syscall.SYS_CLOCK_GETTIME, uintptr(linux.CLOCK_PROCESS_CPUTIME_ID), uintptr(unsafe.Pointer(&ts)), 0)
+	var ts unix.Timespec
+	_, _, errno := unix.RawSyscall(unix.SYS_CLOCK_GETTIME, uintptr(linux.CLOCK_PROCESS_CPUTIME_ID), uintptr(unsafe.Pointer(&ts)), 0)
 	if errno != 0 {
 		return 0, fmt.Errorf("failed calling clock_gettime(CLOCK_PROCESS_CPUTIME_ID): errno=%d", errno)
 	}