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//go:build freebsd && cgo
// +build freebsd,cgo
package system
import (
"errors"
"fmt"
"unsafe"
"golang.org/x/sys/unix"
)
// #include <unistd.h>
// #include <sys/vmmeter.h>
// #include <sys/sysctl.h>
// #include <vm/vm_param.h>
import "C"
func getMemInfo() (int64, int64, error) {
data, err := unix.SysctlRaw("vm.vmtotal")
if err != nil {
return -1, -1, fmt.Errorf("can't get kernel info: %w", err)
}
if len(data) != C.sizeof_struct_vmtotal {
return -1, -1, fmt.Errorf("unexpected vmtotal size %d", len(data))
}
total := (*C.struct_vmtotal)(unsafe.Pointer(&data[0]))
pagesize := int64(C.sysconf(C._SC_PAGESIZE))
npages := int64(C.sysconf(C._SC_PHYS_PAGES))
return pagesize * npages, pagesize * int64(total.t_free), nil
}
func getSwapInfo() (int64, int64, error) {
var (
total int64 = 0
used int64 = 0
)
swapCount, err := unix.SysctlUint32("vm.nswapdev")
if err != nil {
return -1, -1, fmt.Errorf("reading vm.nswapdev: %w", err)
}
for i := 0; i < int(swapCount); i++ {
data, err := unix.SysctlRaw("vm.swap_info", i)
if err != nil {
return -1, -1, fmt.Errorf("reading vm.swap_info.%d: %w", i, err)
}
if len(data) != C.sizeof_struct_xswdev {
return -1, -1, fmt.Errorf("unexpected swap_info size %d", len(data))
}
xsw := (*C.struct_xswdev)(unsafe.Pointer(&data[0]))
total += int64(xsw.xsw_nblks)
used += int64(xsw.xsw_used)
}
pagesize := int64(C.sysconf(C._SC_PAGESIZE))
return pagesize * total, pagesize * (total - used), nil
}
// ReadMemInfo retrieves memory statistics of the host system and returns a
// MemInfo type.
func ReadMemInfo() (*MemInfo, error) {
MemTotal, MemFree, err := getMemInfo()
if err != nil {
return nil, fmt.Errorf("getting memory totals %w", err)
}
SwapTotal, SwapFree, err := getSwapInfo()
if err != nil {
return nil, fmt.Errorf("getting swap totals %w", err)
}
if MemTotal < 0 || MemFree < 0 || SwapTotal < 0 || SwapFree < 0 {
return nil, errors.New("getting system memory info")
}
meminfo := &MemInfo{}
// Total memory is total physical memory less than memory locked by kernel
meminfo.MemTotal = MemTotal
meminfo.MemFree = MemFree
meminfo.SwapTotal = SwapTotal
meminfo.SwapFree = SwapFree
return meminfo, nil
}
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