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unix
Dosya Düzenle: getrandom.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. //go:build dragonfly || freebsd || linux package unix import ( "sync/atomic" "syscall" "unsafe" ) var getrandomUnsupported atomic.Bool // GetRandomFlag is a flag supported by the getrandom system call. type GetRandomFlag uintptr // GetRandom calls the getrandom system call. func GetRandom(p []byte, flags GetRandomFlag) (n int, err error) { if len(p) == 0 { return 0, nil } if getrandomUnsupported.Load() { return 0, syscall.ENOSYS } r1, _, errno := syscall.Syscall(getrandomTrap, uintptr(unsafe.Pointer(&p[0])), uintptr(len(p)), uintptr(flags)) if errno != 0 { if errno == syscall.ENOSYS { getrandomUnsupported.Store(true) } return 0, errno } return int(r1), nil }
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