mirror of
https://github.com/superseriousbusiness/gotosocial
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36 lines
1.2 KiB
Go
36 lines
1.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE-GO file.
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//go:build linux && (386 || arm || mips || mipsle)
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// +build linux
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// +build 386 arm mips mipsle
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package memory
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import (
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"syscall"
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)
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// Function syscall.mmap and syscall.mmap2 are same for linux/386, linux/arm,
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// linux/mips and linux/mipsle
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// https://cs.opensource.google/go/go/+/refs/tags/go1.17.8:src/syscall/syscall_linux_386.go;l=99-105
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func mmapSyscall(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
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page := uintptr(offset / 4096)
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if offset != int64(page)*4096 {
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return 0, syscall.EINVAL
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}
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return mmap2Syscall(addr, length, prot, flags, fd, page)
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}
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// https://cs.opensource.google/go/go/+/refs/tags/go1.17.8:src/syscall/zsyscall_linux_386.go;l=1361-1370
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func mmap2Syscall(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) {
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r0, _, e1 := syscall.Syscall6(syscall.SYS_MMAP2, uintptr(addr), uintptr(length), uintptr(prot), uintptr(flags), uintptr(fd), uintptr(pageOffset))
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xaddr = uintptr(r0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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