func sysctlCptime()

in sigar_openbsd.go [401:427]

19 lines of code
6 McCabe index (conditional complexity)


func sysctlCptime(ncpu int, curcpu int, load *[C.CPUSTATES]C.long) error {
	var mib []int32

	// Use the correct mib based on the number of CPUs and fill out the
	// current CPU number in case of SMP. (0 indexed cf. self.List)
	if ncpu == 0 {
		mib = []int32{C.CTL_KERN, C.KERN_CPTIME}
	} else {
		mib = []int32{C.CTL_KERN, C.KERN_CPTIME2, int32(curcpu)}
	}

	len := len(mib)

	n := uintptr(0)
	// First we determine how much memory we'll need to pass later on (via `n`)
	_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), uintptr(len), 0, uintptr(unsafe.Pointer(&n)), 0, 0)
	if errno != 0 || n == 0 {
		return nil
	}

	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), uintptr(len), uintptr(unsafe.Pointer(load)), uintptr(unsafe.Pointer(&n)), 0, 0)
	if errno != 0 || n == 0 {
		return nil
	}

	return nil
}