go getrandom_solaris 源码

2022-07-15
浏览 (876)

golang getrandom_solaris 代码

文件路径：/src/internal/syscall/unix/getrandom_solaris.go

// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package unix

import (
	"sync/atomic"
	"syscall"
	"unsafe"
)

//go:cgo_import_dynamic libc_getrandom getrandom "libc.so"

//go:linkname procGetrandom libc_getrandom

var procGetrandom uintptr

var getrandomUnsupported int32 // atomic

// GetRandomFlag is a flag supported by the getrandom system call.
type GetRandomFlag uintptr

const (
	// GRND_NONBLOCK means return EAGAIN rather than blocking.
	GRND_NONBLOCK GetRandomFlag = 0x0001

	// GRND_RANDOM means use the /dev/random pool instead of /dev/urandom.
	GRND_RANDOM GetRandomFlag = 0x0002
)

// GetRandom calls the getrandom system call.
func GetRandom(p []byte, flags GetRandomFlag) (n int, err error) {
	if len(p) == 0 {
		return 0, nil
	}
	if atomic.LoadInt32(&getrandomUnsupported) != 0 {
		return 0, syscall.ENOSYS
	}
	r1, _, errno := syscall6(uintptr(unsafe.Pointer(&procGetrandom)),
		3,
		uintptr(unsafe.Pointer(&p[0])),
		uintptr(len(p)),
		uintptr(flags),
		0, 0, 0)
	if errno != 0 {
		if errno == syscall.ENOSYS {
			atomic.StoreInt32(&getrandomUnsupported, 1)
		}
		return 0, errno
	}
	return int(r1), nil
}

相关信息

go 源码目录

相关文章

go at_aix 源码

go at_darwin 源码

go at_freebsd 源码

go at_fstatat 源码

go at_libc 源码

go at_solaris 源码

go at_statx 源码

go at_sysnum_darwin 源码

go at_sysnum_dragonfly 源码

0 赞

所属分类： 后端技术
本文标签： golang
版权声明： 原创文章如转载，请注明本文链接: https://m.seaxiang.com/blog/e6b44706ef6e4acf9c5ea7678d4f18af

热门推荐

1、直接访问google.com
2、 - 优质文章
3、 gate.io
4、 harmony 鸿蒙hdc使用指导
5、 harmony 鸿蒙ArkUI组件（ArkTS）开发常见问题
6、 harmony 鸿蒙初识ArkTS语言
7、 golang
8、 flink kafka connector scan.startup.mode 的几个选项
9、 openharmony
10、 Vue中input框自动聚焦

Loading...