1 files changed, 52 insertions, 0 deletions

diff --git a/vendor/golang.org/x/sys/unix/mremap.go b/vendor/golang.org/x/sys/unix/mremap.go
new file mode 100644
index 0000000..fd45fe5
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/mremap.go
@@ -0,0 +1,52 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux || netbsd
+
+package unix
+
+import "unsafe"
+
+type mremapMmapper struct {
+        mmapper
+        mremap func(oldaddr uintptr, oldlength uintptr, newlength uintptr, flags int, newaddr uintptr) (xaddr uintptr, err error)
+}
+
+var mapper = &mremapMmapper{
+        mmapper: mmapper{
+                active: make(map[*byte][]byte),
+                mmap:   mmap,
+                munmap: munmap,
+        },
+        mremap: mremap,
+}
+
+func (m *mremapMmapper) Mremap(oldData []byte, newLength int, flags int) (data []byte, err error) {
+        if newLength <= 0 || len(oldData) == 0 || len(oldData) != cap(oldData) || flags&mremapFixed != 0 {
+                return nil, EINVAL
+        }
+
+        pOld := &oldData[cap(oldData)-1]
+        m.Lock()
+        defer m.Unlock()
+        bOld := m.active[pOld]
+        if bOld == nil || &bOld[0] != &oldData[0] {
+                return nil, EINVAL
+        }
+        newAddr, errno := m.mremap(uintptr(unsafe.Pointer(&bOld[0])), uintptr(len(bOld)), uintptr(newLength), flags, 0)
+        if errno != nil {
+                return nil, errno
+        }
+        bNew := unsafe.Slice((*byte)(unsafe.Pointer(newAddr)), newLength)
+        pNew := &bNew[cap(bNew)-1]
+        if flags&mremapDontunmap == 0 {
+                delete(m.active, pOld)
+        }
+        m.active[pNew] = bNew
+        return bNew, nil
+}
+
+func Mremap(oldData []byte, newLength int, flags int) (data []byte, err error) {
+        return mapper.Mremap(oldData, newLength, flags)
+}