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// Copyright 2021 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 (darwin && !ios) || linux package unix import "unsafe" // SysvShmAttach attaches the Sysv shared memory segment associated with the // shared memory identifier id. func SysvShmAttach(id int, addr uintptr, flag int) ([]byte, error) { addr, errno := shmat(id, addr, flag) if errno != nil { return nil, errno } // Retrieve the size of the shared memory to enable slice creation var info SysvShmDesc _, err := SysvShmCtl(id, IPC_STAT, &info) if err != nil { // release the shared memory if we can't find the size // ignoring error from shmdt as there's nothing sensible to return here shmdt(addr) return nil, err } // Use unsafe to convert addr into a []byte. b := unsafe.Slice((*byte)(unsafe.Pointer(addr)), int(info.Segsz)) return b, nil } // SysvShmDetach unmaps the shared memory slice returned from SysvShmAttach. // // It is not safe to use the slice after calling this function. func SysvShmDetach(data []byte) error { if len(data) == 0 { return EINVAL } return shmdt(uintptr(unsafe.Pointer(&data[0]))) } // SysvShmGet returns the Sysv shared memory identifier associated with key. // If the IPC_CREAT flag is specified a new segment is created. func SysvShmGet(key, size, flag int) (id int, err error) { return shmget(key, size, flag) }
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