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// 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 linux
package pprof
import (
"fmt"
"regexp"
"strconv"
"syscall"
)
var versionRe = regexp.MustCompile(`^(\d+)(?:\.(\d+)(?:\.(\d+))).*$`)
func linuxKernelVersion() (major, minor, patch int, err error) {
var uname syscall.Utsname
if err := syscall.Uname(&uname); err != nil {
return 0, 0, 0, err
}
buf := make([]byte, 0, len(uname.Release))
for _, b := range uname.Release {
if b == 0 {
break
}
buf = append(buf, byte(b))
}
rl := string(buf)
m := versionRe.FindStringSubmatch(rl)
if m == nil {
return 0, 0, 0, fmt.Errorf("error matching version number in %q", rl)
}
v, err := strconv.ParseInt(m[1], 10, 64)
if err != nil {
return 0, 0, 0, fmt.Errorf("error parsing major version %q in %s: %w", m[1], rl, err)
}
major = int(v)
if len(m) >= 3 {
v, err := strconv.ParseInt(m[2], 10, 64)
if err != nil {
return 0, 0, 0, fmt.Errorf("error parsing minor version %q in %s: %w", m[2], rl, err)
}
minor = int(v)
}
if len(m) >= 4 {
v, err := strconv.ParseInt(m[3], 10, 64)
if err != nil {
return 0, 0, 0, fmt.Errorf("error parsing patch version %q in %s: %w", m[3], rl, err)
}
patch = int(v)
}
return
}
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