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// Copyright 2025 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 linux
package runtime
import (
"internal/runtime/atomic"
"internal/runtime/syscall"
"unsafe"
)
var prSetVMAUnsupported atomic.Bool
func setVMANameSupported() bool {
return !prSetVMAUnsupported.Load()
}
// setVMAName calls prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, start, len, name)
func setVMAName(start unsafe.Pointer, length uintptr, name string) {
if debug.decoratemappings == 0 || !setVMANameSupported() {
return
}
var sysName [80]byte
n := copy(sysName[:], " Go: ")
copy(sysName[n:79], name) // leave final byte zero
_, _, err := syscall.Syscall6(syscall.SYS_PRCTL, syscall.PR_SET_VMA, syscall.PR_SET_VMA_ANON_NAME, uintptr(start), length, uintptr(unsafe.Pointer(&sysName[0])), 0)
if err == _EINVAL {
prSetVMAUnsupported.Store(true)
}
// ignore other errors
}
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