Function Shmget

pkg/sentry/syscalls/linux/sys_shm.go:27–45

Shmget implements shmget(2).

(t *kernel.Task, sysno uintptr, args arch.SyscallArguments)

// Shmget implements shmget(2).
func Shmget(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
	key := ipc.Key(args[0].Int())
	size := uint64(args[1].SizeT())
	flag := args[2].Int()

	private := key == linux.IPC_PRIVATE
	create := flag&linux.IPC_CREAT == linux.IPC_CREAT
	exclusive := flag&linux.IPC_EXCL == linux.IPC_EXCL
	mode := linux.FileMode(flag & 0777)

	pid := int32(t.ThreadGroup().ID())
	r := t.IPCNamespace().ShmRegistry()
	segment, err := r.FindOrCreate(t, pid, key, size, mode, private, create, exclusive)
	if err != nil {
		return 0, nil, err
	}
	defer segment.DecRef(t)
	return uintptr(segment.ID()), nil, nil
}

// findSegment retrieves a shm segment by the given id.
//