[process][darwin] Fix #925 properly and improve some tests

process/process_darwin.go

@@ -12,7 +12,6 @@ import (
 	"strconv"
 	"strings"
 	"time"
-	"unsafe"
 
 	"github.com/shirou/gopsutil/cpu"
 	"github.com/shirou/gopsutil/internal/common"
@@ -602,24 +601,9 @@ func parseKinfoProc(buf []byte) (KinfoProc, error) {
 // Returns a proc as defined here:
 // http://unix.superglobalmegacorp.com/Net2/newsrc/sys/kinfo_proc.h.html
 func (p *Process) getKProc() (*KinfoProc, error) {
-	return p.getKProcWithContext(context.Background())
-}
-
-func (p *Process) getKProcWithContext(ctx context.Context) (*KinfoProc, error) {
-	mib := []int32{CTLKern, KernProc, KernProcPID, p.Pid}
-	procK := KinfoProc{}
-	length := uint64(unsafe.Sizeof(procK))
-	buf := make([]byte, length)
-	_, _, syserr := unix.Syscall6(
-		202, // unix.SYS___SYSCTL https://github.com/golang/sys/blob/76b94024e4b621e672466e8db3d7f084e7ddcad2/unix/zsysnum_darwin_amd64.go#L146
-		uintptr(unsafe.Pointer(&mib[0])),
-		uintptr(len(mib)),
-		uintptr(unsafe.Pointer(&buf[0])),
-		uintptr(unsafe.Pointer(&length)),
-		0,
-		0)
-	if syserr != 0 {
-		return nil, syserr
+	buf, err := unix.SysctlRaw("kern.proc.pid", int(p.Pid))
+	if err != nil {
+		return nil, err
 	}
 	k, err := parseKinfoProc(buf)
 	if err != nil {

process/process_test.go

@@ -181,6 +181,10 @@ func Test_Process_Ppid(t *testing.T) {
 	if v == 0 {
 		t.Errorf("return value is 0 %v", v)
 	}
+	expected := os.Getppid()
+	if v != int32(expected) {
+		t.Errorf("return value is %v, expected %v", v, expected)
+	}
 }
 
 func Test_Process_Status(t *testing.T) {
@@ -658,3 +662,24 @@ func Test_AllProcesses_cmdLine(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkNewProcess(b *testing.B) {
+	checkPid := os.Getpid()
+	for i := 0; i < b.N; i++ {
+		NewProcess(int32(checkPid))
+	}
+}
+
+func BenchmarkProcessName(b *testing.B) {
+	p := testGetProcess()
+	for i := 0; i < b.N; i++ {
+		p.Name()
+	}
+}
+
+func BenchmarkProcessPpid(b *testing.B) {
+	p := testGetProcess()
+	for i := 0; i < b.N; i++ {
+		p.Ppid()
+	}
+}