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https://github.com/luxfi/kms.git
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zeekay
cc986c328d
Squashes all pre-rewrite history into a single root commit. Previous tree: - 14506 commits including upstream Infisical fork history - Multiple merge chains carrying pre-purge content Force-rewrite per disk-space reclamation discipline. GHCR images (1.9.9, 1.9.11) remain immutable; their git lineage is no longer materialized.
64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
//go:build !js
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// +build !js
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/*
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* SPDX-FileCopyrightText: © 2017-2025 Istari Digital, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package z
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import (
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"os"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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// mmap uses the mmap system call to memory-map a file. If writable is true,
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// memory protection of the pages is set so that they may be written to as well.
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func mmap(fd *os.File, writable bool, size int64) ([]byte, error) {
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mtype := unix.PROT_READ
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if writable {
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mtype |= unix.PROT_WRITE
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}
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return unix.Mmap(int(fd.Fd()), 0, int(size), mtype, unix.MAP_SHARED)
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}
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// munmap unmaps a previously mapped slice.
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//
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// unix.Munmap maintains an internal list of mmapped addresses, and only calls munmap
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// if the address is present in that list. If we use mremap, this list is not updated.
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// To bypass this, we call munmap ourselves.
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func munmap(data []byte) error {
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if len(data) == 0 || len(data) != cap(data) {
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return unix.EINVAL
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}
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_, _, errno := unix.Syscall(
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unix.SYS_MUNMAP,
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uintptr(unsafe.Pointer(&data[0])),
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uintptr(len(data)),
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0,
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)
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if errno != 0 {
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return errno
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}
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return nil
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}
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// madvise uses the madvise system call to give advise about the use of memory
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// when using a slice that is memory-mapped to a file. Set the readahead flag to
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// false if page references are expected in random order.
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func madvise(b []byte, readahead bool) error {
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flags := unix.MADV_NORMAL
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if !readahead {
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flags = unix.MADV_RANDOM
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}
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return unix.Madvise(b, flags)
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}
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// msync writes any modified data to persistent storage.
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func msync(b []byte) error {
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return unix.Msync(b, unix.MS_SYNC)
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}
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