[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, 3 insertions, 2 deletions

diff --git a/pkg/flipcall/flipcall.go b/pkg/flipcall/flipcall.go
index c4a3366ce..8d8309a73 100644
--- a/pkg/flipcall/flipcall.go
+++ b/pkg/flipcall/flipcall.go
@@ -20,7 +20,8 @@ import (
 	"fmt"
 	"math"
 	"sync/atomic"
-	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 // An Endpoint provides the ability to synchronously transfer data and control
@@ -130,7 +131,7 @@ func (ep *Endpoint) Destroy() {
 }
 
 func (ep *Endpoint) unmapPacket() {
-	syscall.RawSyscall(syscall.SYS_MUNMAP, ep.packet, uintptr(ep.dataCap)+PacketHeaderBytes, 0)
+	unix.RawSyscall(unix.SYS_MUNMAP, ep.packet, uintptr(ep.dataCap)+PacketHeaderBytes, 0)
 	ep.packet = 0
 }