| Linux in-mum-web1499.main-hosting.eu 5.14.0-503.40.1.el9_5.x86_64 #1 SMP PREEMPT_DYNAMIC Mon May 5 06:06:04 EDT 2025 x86_64 Path : /opt/golang/1.22.0/src/internal/syscall/unix/ |
| Current File : //opt/golang/1.22.0/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 atomic.Bool
// 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 getrandomUnsupported.Load() {
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 {
getrandomUnsupported.Store(true)
}
return 0, errno
}
return int(r1), nil
}