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// SPDX-License-Identifier: BSD-3-Clause
//go:build freebsd || openbsd
package common
import (
"fmt"
"os"
"os/exec"
"strings"
"unsafe"
"golang.org/x/sys/unix"
)
func SysctlUint(mib string) (uint64, error) {
buf, err := unix.SysctlRaw(mib)
if err != nil {
return 0, err
}
if len(buf) == 8 { // 64 bit
return *(*uint64)(unsafe.Pointer(&buf[0])), nil
}
if len(buf) == 4 { // 32bit
t := *(*uint32)(unsafe.Pointer(&buf[0]))
return uint64(t), nil
}
return 0, fmt.Errorf("unexpected size: %s, %d", mib, len(buf))
}
func DoSysctrl(mib string) ([]string, error) {
cmd := exec.Command("sysctl", "-n", mib)
cmd.Env = getSysctrlEnv(os.Environ())
out, err := cmd.Output()
if err != nil {
return []string{}, err
}
v := strings.Replace(string(out), "{ ", "", 1)
v = strings.Replace(string(v), " }", "", 1)
values := strings.Fields(string(v))
return values, nil
}
func CallSyscall(mib []int32) ([]byte, uint64, error) {
mibptr := unsafe.Pointer(&mib[0])
miblen := uint64(len(mib))
// get required buffer size
length := uint64(0)
_, _, err := unix.Syscall6(
unix.SYS___SYSCTL,
uintptr(mibptr),
uintptr(miblen),
0,
uintptr(unsafe.Pointer(&length)),
0,
0)
if err != 0 {
var b []byte
return b, length, err
}
if length == 0 {
var b []byte
return b, length, err
}
// get proc info itself
buf := make([]byte, length)
_, _, err = unix.Syscall6(
unix.SYS___SYSCTL,
uintptr(mibptr),
uintptr(miblen),
uintptr(unsafe.Pointer(&buf[0])),
uintptr(unsafe.Pointer(&length)),
0,
0)
if err != 0 {
return buf, length, err
}
return buf, length, nil
}
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