func()

in sigar_openbsd.go [232:269]

• 31 lines of code
• 9 McCabe index (conditional complexity)

func (self *Mem) Get() error {
	n := uintptr(0)

	var uvmexp Uvmexp
	mib := [2]int32{C.CTL_VM, C.VM_UVMEXP}
	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])), 2, 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])), 2, uintptr(unsafe.Pointer(&uvmexp)), uintptr(unsafe.Pointer(&n)), 0, 0)
	if errno != 0 || n == 0 {
		return nil
	}

	var bcachestats Bcachestats
	mib3 := [3]int32{C.CTL_VFS, C.VFS_GENERIC, C.VFS_BCACHESTAT}
	n = uintptr(0)
	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib3[0])), 3, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
	if errno != 0 || n == 0 {
		return nil
	}
	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib3[0])), 3, uintptr(unsafe.Pointer(&bcachestats)), uintptr(unsafe.Pointer(&n)), 0, 0)
	if errno != 0 || n == 0 {
		return nil
	}

	self.Total = uint64(uvmexp.npages) << uvmexp.pageshift
	self.Used = uint64(uvmexp.npages-uvmexp.free) << uvmexp.pageshift
	self.Free = uint64(uvmexp.free) << uvmexp.pageshift

	self.ActualFree = self.Free + (uint64(bcachestats.numbufpages) << uvmexp.pageshift)
	self.ActualUsed = self.Used - (uint64(bcachestats.numbufpages) << uvmexp.pageshift)

	return nil
}