modernc.org/memory@v1.8.0/mmap_linux_32.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE-GO file.
     4  
     5  //go:build linux && (386 || arm || mips || mipsle)
     6  // +build linux
     7  // +build 386 arm mips mipsle
     8  
     9  package memory
    10  
    11  import (
    12  	"syscall"
    13  )
    14  
    15  // Function syscall.mmap and syscall.mmap2 are same for linux/386, linux/arm,
    16  // linux/mips and linux/mipsle
    17  
    18  // https://cs.opensource.google/go/go/+/refs/tags/go1.17.8:src/syscall/syscall_linux_386.go;l=99-105
    19  func mmapSyscall(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
    20  	page := uintptr(offset / 4096)
    21  	if offset != int64(page)*4096 {
    22  		return 0, syscall.EINVAL
    23  	}
    24  	return mmap2Syscall(addr, length, prot, flags, fd, page)
    25  }
    26  
    27  // https://cs.opensource.google/go/go/+/refs/tags/go1.17.8:src/syscall/zsyscall_linux_386.go;l=1361-1370
    28  func mmap2Syscall(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) {
    29  	r0, _, e1 := syscall.Syscall6(syscall.SYS_MMAP2, uintptr(addr), uintptr(length), uintptr(prot), uintptr(flags), uintptr(fd), uintptr(pageOffset))
    30  	xaddr = uintptr(r0)
    31  	if e1 != 0 {
    32  		err = e1
    33  	}
    34  	return
    35  }