mirror of https://github.com/status-im/consul.git
86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
// +build freebsd openbsd
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package common
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import (
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"fmt"
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"os"
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"os/exec"
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"strings"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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func SysctlUint(mib string) (uint64, error) {
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buf, err := unix.SysctlRaw(mib)
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if err != nil {
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return 0, err
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}
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if len(buf) == 8 { // 64 bit
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return *(*uint64)(unsafe.Pointer(&buf[0])), nil
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}
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if len(buf) == 4 { // 32bit
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t := *(*uint32)(unsafe.Pointer(&buf[0]))
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return uint64(t), nil
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}
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return 0, fmt.Errorf("unexpected size: %s, %d", mib, len(buf))
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}
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func DoSysctrl(mib string) ([]string, error) {
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sysctl, err := exec.LookPath("sysctl")
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if err != nil {
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return []string{}, err
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}
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cmd := exec.Command(sysctl, "-n", mib)
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cmd.Env = getSysctrlEnv(os.Environ())
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out, err := cmd.Output()
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if err != nil {
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return []string{}, err
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}
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v := strings.Replace(string(out), "{ ", "", 1)
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v = strings.Replace(string(v), " }", "", 1)
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values := strings.Fields(string(v))
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return values, nil
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}
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func CallSyscall(mib []int32) ([]byte, uint64, error) {
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mibptr := unsafe.Pointer(&mib[0])
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miblen := uint64(len(mib))
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// get required buffer size
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length := uint64(0)
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_, _, err := unix.Syscall6(
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unix.SYS___SYSCTL,
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uintptr(mibptr),
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uintptr(miblen),
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0,
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uintptr(unsafe.Pointer(&length)),
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0,
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0)
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if err != 0 {
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var b []byte
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return b, length, err
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}
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if length == 0 {
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var b []byte
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return b, length, err
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}
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// get proc info itself
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buf := make([]byte, length)
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_, _, err = unix.Syscall6(
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unix.SYS___SYSCTL,
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uintptr(mibptr),
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uintptr(miblen),
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uintptr(unsafe.Pointer(&buf[0])),
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uintptr(unsafe.Pointer(&length)),
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0,
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0)
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if err != 0 {
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return buf, length, err
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}
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return buf, length, nil
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}
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