gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/memutil/mmap.go (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build !false
    16  // +build !false
    17  
    18  package memutil
    19  
    20  import (
    21  	"golang.org/x/sys/unix"
    22  )
    23  
    24  // MapFile returns a memory mapping configured by the given options as per
    25  // mmap(2).
    26  func MapFile(addr, size, prot, flags, fd, offset uintptr) (uintptr, error) {
    27  	m, _, e := unix.RawSyscall6(unix.SYS_MMAP, addr, size, prot, flags, fd, offset)
    28  	if e != 0 {
    29  		return 0, e
    30  	}
    31  	return m, nil
    32  }