[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, 6 insertions, 5 deletions

diff --git a/pkg/safemem/BUILD b/pkg/safemem/BUILD
index d3b9b0ca9..3fda3a9cc 100644
--- a/pkg/safemem/BUILD
+++ b/pkg/safemem/BUILD
@@ -14,6 +14,7 @@ go_library(
     deps = [
         "//pkg/gohacks",
         "//pkg/safecopy",
+        "@org_golang_x_sys//unix:go_default_library",
     ],
 )
 
diff --git a/pkg/safemem/seq_unsafe.go b/pkg/safemem/seq_unsafe.go
index b315b0e5a..bbf8740a5 100644
--- a/pkg/safemem/seq_unsafe.go
+++ b/pkg/safemem/seq_unsafe.go
@@ -17,9 +17,9 @@ package safemem
 import (
 	"bytes"
 	"fmt"
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/gohacks"
 )
 
@@ -304,12 +304,12 @@ func ZeroSeq(dsts BlockSeq) (uint64, error) {
 	return done, nil
 }
 
-// IovecsFromBlockSeq returns a []syscall.Iovec representing seq.
-func IovecsFromBlockSeq(bs BlockSeq) []syscall.Iovec {
-	iovs := make([]syscall.Iovec, 0, bs.NumBlocks())
+// IovecsFromBlockSeq returns a []unix.Iovec representing seq.
+func IovecsFromBlockSeq(bs BlockSeq) []unix.Iovec {
+	iovs := make([]unix.Iovec, 0, bs.NumBlocks())
 	for ; !bs.IsEmpty(); bs = bs.Tail() {
 		b := bs.Head()
-		iovs = append(iovs, syscall.Iovec{
+		iovs = append(iovs, unix.Iovec{
 			Base: &b.ToSlice()[0],
 			Len:  uint64(b.Len()),
 		})