// license that can be found in the LICENSE file.

package unix

import (
	"internal/abi"
	"unsafe"
)

//go:cgo_import_dynamic libc_arc4random_buf arc4random_buf "/usr/lib/libSystem.B.dylib"

func libc_arc4random_buf_trampoline()

// ARC4Random calls the macOS arc4random_buf(3) function.
func ARC4Random(p []byte) {
	// macOS 11 and 12 abort if length is 0.
	if len(p) == 0 {
		return
	}

//go:cgo_import_dynamic _sanitizer_internal_memmove _sanitizer_internal_memmove ""
//go:cgo_import_dynamic _sanitizer_internal_memset _sanitizer_internal_memset ""
//go:cgo_import_dynamic abort abort ""
//go:cgo_import_dynamic arc4random_buf arc4random_buf ""
//go:cgo_import_dynamic close close ""
//go:cgo_import_dynamic dlsym dlsym ""
//go:cgo_import_dynamic dup dup ""
//go:cgo_import_dynamic dup2 dup2 ""

//go:cgo_import_dynamic _sanitizer_internal_memmove _sanitizer_internal_memmove ""
//go:cgo_import_dynamic _sanitizer_internal_memset _sanitizer_internal_memset ""
//go:cgo_import_dynamic abort abort ""
//go:cgo_import_dynamic arc4random_buf arc4random_buf ""
//go:cgo_import_dynamic bzero bzero ""
//go:cgo_import_dynamic close close ""
//go:cgo_import_dynamic dlsym dlsym ""
//go:cgo_import_dynamic dup dup ""
//go:cgo_import_dynamic dup2 dup2 ""

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package rand

import "internal/syscall/unix"

func init() {
	// arc4random_buf is the recommended application CSPRNG, accepts buffers of
	// any size, and never returns an error.
	//
	// "The subsystem is re-seeded from the kernel random number subsystem on a

// secure random number generator.
//
//   - On Linux, FreeBSD, Dragonfly, and Solaris, Reader uses getrandom(2)
//     if available, and /dev/urandom otherwise.
//   - On macOS and iOS, Reader uses arc4random_buf(3).
//   - On OpenBSD and NetBSD, Reader uses getentropy(2).
//   - On other Unix-like systems, Reader reads from /dev/urandom.
//   - On Windows, Reader uses the ProcessPrng API.