mirror of
https://github.com/superseriousbusiness/gotosocial.git
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49009fbd8f
This fixes some linkname shenanigans previous versions of the library were using. It's now safe to upgrade to Go 1.23 and beyond once they become available.
58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build linux || netbsd
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package unix
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import "unsafe"
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type mremapMmapper struct {
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mmapper
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mremap func(oldaddr uintptr, oldlength uintptr, newlength uintptr, flags int, newaddr uintptr) (xaddr uintptr, err error)
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}
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var mapper = &mremapMmapper{
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mmapper: mmapper{
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active: make(map[*byte][]byte),
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mmap: mmap,
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munmap: munmap,
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},
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mremap: mremap,
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}
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func (m *mremapMmapper) Mremap(oldData []byte, newLength int, flags int) (data []byte, err error) {
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if newLength <= 0 || len(oldData) == 0 || len(oldData) != cap(oldData) || flags&mremapFixed != 0 {
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return nil, EINVAL
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}
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pOld := &oldData[cap(oldData)-1]
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m.Lock()
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defer m.Unlock()
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bOld := m.active[pOld]
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if bOld == nil || &bOld[0] != &oldData[0] {
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return nil, EINVAL
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}
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newAddr, errno := m.mremap(uintptr(unsafe.Pointer(&bOld[0])), uintptr(len(bOld)), uintptr(newLength), flags, 0)
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if errno != nil {
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return nil, errno
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}
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bNew := unsafe.Slice((*byte)(unsafe.Pointer(newAddr)), newLength)
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pNew := &bNew[cap(bNew)-1]
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if flags&mremapDontunmap == 0 {
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delete(m.active, pOld)
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}
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m.active[pNew] = bNew
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return bNew, nil
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}
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func Mremap(oldData []byte, newLength int, flags int) (data []byte, err error) {
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return mapper.Mremap(oldData, newLength, flags)
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}
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func MremapPtr(oldAddr unsafe.Pointer, oldSize uintptr, newAddr unsafe.Pointer, newSize uintptr, flags int) (ret unsafe.Pointer, err error) {
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xaddr, err := mapper.mremap(uintptr(oldAddr), oldSize, newSize, flags, uintptr(newAddr))
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return unsafe.Pointer(xaddr), err
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}
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