github.com/fiatjaf/generic-ristretto@v0.0.1/z/mmap_plan9.go (about)

     1  /*
     2   * Copyright 2020 Dgraph Labs, Inc. and Contributors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package z
    18  
    19  import (
    20  	"os"
    21  	"syscall"
    22  )
    23  
    24  // Mmap uses the mmap system call to memory-map a file. If writable is true,
    25  // memory protection of the pages is set so that they may be written to as well.
    26  func mmap(fd *os.File, writable bool, size int64) ([]byte, error) {
    27  	return nil, syscall.EPLAN9
    28  }
    29  
    30  // Munmap unmaps a previously mapped slice.
    31  func munmap(b []byte) error {
    32  	return syscall.EPLAN9
    33  }
    34  
    35  // Madvise uses the madvise system call to give advise about the use of memory
    36  // when using a slice that is memory-mapped to a file. Set the readahead flag to
    37  // false if page references are expected in random order.
    38  func madvise(b []byte, readahead bool) error {
    39  	return syscall.EPLAN9
    40  }
    41  
    42  func msync(b []byte) error {
    43  	return syscall.EPLAN9
    44  }