add placeholder of disk on freebsd

disk_freebsd.go

@@ -3,9 +3,9 @@
 package gopsutil
 
 import (
-	"errors"
 	"syscall"
 	"unsafe"
+	"errors"
 )
 
 func DiskPartitions(all bool) ([]DiskPartitionStat, error) {
@@ -83,8 +83,33 @@ func DiskPartitions(all bool) ([]DiskPartitionStat, error) {
 }
 
 func DiskIOCounters() (map[string]DiskIOCountersStat, error) {
+	return nil, errors.New("not implemented yet")
+
+	// statinfo->devinfo->devstat
+    // /usr/include/devinfo.h
+
+	// get length
+	count, err := Getfsstat(nil, MNT_WAIT)
+	if err != nil {
+		return nil, err
+	}
+
+	fs := make([]Statfs, count)
+	_, err = Getfsstat(fs, MNT_WAIT)
+
 	ret := make(map[string]DiskIOCountersStat, 0)
-	return ret, errors.New("not implemented yet")
+	for _, stat := range fs {
+		name := byteToString(stat.FMntonname[:])
+		d := DiskIOCountersStat{
+			Name:       name,
+			ReadCount:  stat.FSyncwrites + stat.FAsyncwrites,
+			WriteCount: stat.FSyncreads + stat.FAsyncreads,
+		}
+
+		ret[name] = d
+	}
+
+	return ret, nil
 }
 
 // Getfsstat is borrowed from pkg/syscall/syscall_freebsd.go

disk_freebsd_amd64.go

@@ -53,3 +53,54 @@ type Statfs struct {
 	FMntfromname [MNAMELEN]byte   /* mounted filesystem */
 	FMntonname   [MNAMELEN]byte   /* directory on which mounted */
 }
+
+
+// /usr/include/devstat.h
+// devstat_getdevs()
+// kern.devstat.all -> devstats list struct
+
+// struct devinfo {
+//         struct devstat  *devices;
+//         u_int8_t        *mem_ptr;
+//         long            generation;
+//         int             numdevs;
+// };
+// 
+// struct statinfo {
+//         long            cp_time[CPUSTATES];
+//         long            tk_nin;
+//         long            tk_nout;
+//         struct devinfo  *dinfo;
+//         long double     snap_time;
+// };
+
+
+// /usr/include/devinfo.h 
+
+//    struct devinfo_dev {
+//               devinfo_handle_t    dd_handle;      /* device handle */
+//               devinfo_handle_t    dd_parent;      /* parent handle */
+//               char                *dd_name;       /* name of device */
+//               char                *dd_desc;       /* device description */
+//               char                *dd_drivername; /* name of attached driver */
+//               char                *dd_pnpinfo;    /* pnp info from parent bus */
+//               char                *dd_location;   /* Where bus thinks dev at */
+//               uint32_t            dd_devflags;    /* API flags */
+//               uint16_t            dd_flags;       /* internal dev flags */
+//               device_state_t      dd_state;       /* attachment state of dev */
+//	};
+//
+//           struct devinfo_rman {
+//               devinfo_handle_t    dm_handle;      /* resource manager handle */
+//               u_long              dm_start;       /* resource start */
+//               u_long              dm_size;        /* resource size */
+//               char                *dm_desc;       /* resource description */
+//           };
+//
+//           struct devinfo_res {
+//               devinfo_handle_t    dr_handle;      /* resource handle */
+//               devinfo_handle_t    dr_rman;        /* resource manager handle */
+//               devinfo_handle_t    dr_device;      /* owning device */
+//               u_long              dr_start;       /* region start */
+//               u_long              dr_size;        /* region size */
+//           };