Use unix.SysctlUvmexp on OpenBSD

Use SysctlUvmexp from golang.org/x/sys/unix to avoid having to define
the type Uvmexp and the sysctl consts. This will also allow to build on
GOOS=openbsd with e.g. GOARCH=arm64.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

mem/mem_openbsd.go

@@ -11,6 +11,7 @@ import (
 	"os/exec"
 
 	"github.com/shirou/gopsutil/internal/common"
+	"golang.org/x/sys/unix"
 )
 
 func GetPageSize() (uint64, error) {
@@ -18,17 +19,7 @@ func GetPageSize() (uint64, error) {
 }
 
 func GetPageSizeWithContext(ctx context.Context) (uint64, error) {
-	mib := []int32{CTLVm, VmUvmexp}
-	buf, length, err := common.CallSyscall(mib)
-	if err != nil {
-		return 0, err
-	}
-	if length < sizeOfUvmexp {
-		return 0, fmt.Errorf("short syscall ret %d bytes", length)
-	}
-	var uvmexp Uvmexp
-	br := bytes.NewReader(buf)
-	err = common.Read(br, binary.LittleEndian, &uvmexp)
+	uvmexp, err := unix.SysctlUvmexp("vm.uvmexp")
 	if err != nil {
 		return 0, err
 	}
@@ -40,17 +31,7 @@ func VirtualMemory() (*VirtualMemoryStat, error) {
 }
 
 func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
-	mib := []int32{CTLVm, VmUvmexp}
-	buf, length, err := common.CallSyscall(mib)
-	if err != nil {
-		return nil, err
-	}
-	if length < sizeOfUvmexp {
-		return nil, fmt.Errorf("short syscall ret %d bytes", length)
-	}
-	var uvmexp Uvmexp
-	br := bytes.NewReader(buf)
-	err = common.Read(br, binary.LittleEndian, &uvmexp)
+	uvmexp, err := unix.SysctlUvmexp("vm.uvmexp")
 	if err != nil {
 		return nil, err
 	}
@@ -69,8 +50,8 @@ func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
 	ret.Used = ret.Total - ret.Available
 	ret.UsedPercent = float64(ret.Used) / float64(ret.Total) * 100.0
 
-	mib = []int32{CTLVfs, VfsGeneric, VfsBcacheStat}
-	buf, length, err = common.CallSyscall(mib)
+	mib := []int32{CTLVfs, VfsGeneric, VfsBcacheStat}
+	buf, length, err := common.CallSyscall(mib)
 	if err != nil {
 		return nil, err
 	}
@@ -78,7 +59,7 @@ func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
 		return nil, fmt.Errorf("short syscall ret %d bytes", length)
 	}
 	var bcs Bcachestats
-	br = bytes.NewReader(buf)
+	br := bytes.NewReader(buf)
 	err = common.Read(br, binary.LittleEndian, &bcs)
 	if err != nil {
 		return nil, err

mem/mem_openbsd_amd64.go

@@ -4,105 +4,15 @@
 package mem
 
 const (
-	CTLVm         = 2
 	CTLVfs        = 10
-	VmUvmexp      = 4
 	VfsGeneric    = 0
 	VfsBcacheStat = 3
 )
 
 const (
-	sizeOfUvmexp      = 0x154
 	sizeOfBcachestats = 0x78
 )
 
-type Uvmexp struct {
-	Pagesize           int32
-	Pagemask           int32
-	Pageshift          int32
-	Npages             int32
-	Free               int32
-	Active             int32
-	Inactive           int32
-	Paging             int32
-	Wired              int32
-	Zeropages          int32
-	Reserve_pagedaemon int32
-	Reserve_kernel     int32
-	Anonpages          int32
-	Vnodepages         int32
-	Vtextpages         int32
-	Freemin            int32
-	Freetarg           int32
-	Inactarg           int32
-	Wiredmax           int32
-	Anonmin            int32
-	Vtextmin           int32
-	Vnodemin           int32
-	Anonminpct         int32
-	Vtextminpct        int32
-	Vnodeminpct        int32
-	Nswapdev           int32
-	Swpages            int32
-	Swpginuse          int32
-	Swpgonly           int32
-	Nswget             int32
-	Nanon              int32
-	Nanonneeded        int32
-	Nfreeanon          int32
-	Faults             int32
-	Traps              int32
-	Intrs              int32
-	Swtch              int32
-	Softs              int32
-	Syscalls           int32
-	Pageins            int32
-	Obsolete_swapins   int32
-	Obsolete_swapouts  int32
-	Pgswapin           int32
-	Pgswapout          int32
-	Forks              int32
-	Forks_ppwait       int32
-	Forks_sharevm      int32
-	Pga_zerohit        int32
-	Pga_zeromiss       int32
-	Zeroaborts         int32
-	Fltnoram           int32
-	Fltnoanon          int32
-	Fltpgwait          int32
-	Fltpgrele          int32
-	Fltrelck           int32
-	Fltrelckok         int32
-	Fltanget           int32
-	Fltanretry         int32
-	Fltamcopy          int32
-	Fltnamap           int32
-	Fltnomap           int32
-	Fltlget            int32
-	Fltget             int32
-	Flt_anon           int32
-	Flt_acow           int32
-	Flt_obj            int32
-	Flt_prcopy         int32
-	Flt_przero         int32
-	Pdwoke             int32
-	Pdrevs             int32
-	Pdswout            int32
-	Pdfreed            int32
-	Pdscans            int32
-	Pdanscan           int32
-	Pdobscan           int32
-	Pdreact            int32
-	Pdbusy             int32
-	Pdpageouts         int32
-	Pdpending          int32
-	Pddeact            int32
-	Pdreanon           int32
-	Pdrevnode          int32
-	Pdrevtext          int32
-	Fpswtch            int32
-	Kmapent            int32
-}
 type Bcachestats struct {
 	Numbufs       int64
 	Numbufpages   int64

mem/types_openbsd.go

@@ -10,25 +10,19 @@ package mem
 #include <sys/types.h>
 #include <sys/mount.h>
 #include <sys/sysctl.h>
-#include <uvm/uvmexp.h>
-
 */
 import "C"
 
 // Machine characteristics; for internal use.
 
 const (
-	CTLVm         = 2
 	CTLVfs        = 10
-	VmUvmexp      = 4 // get uvmexp
 	VfsGeneric    = 0
 	VfsBcacheStat = 3
 )
 
 const (
-	sizeOfUvmexp      = C.sizeof_struct_uvmexp
 	sizeOfBcachestats = C.sizeof_struct_bcachestats
 )
 
-type Uvmexp C.struct_uvmexp
 type Bcachestats C.struct_bcachestats