sigar/src/os/darwin/darwin_sigar.c

/*
 * Copyright (C) [2004, 2005, 2006], Hyperic, Inc.
 * This file is part of SIGAR.
 * 
 * SIGAR is free software; you can redistribute it and/or modify
 * it under the terms version 2 of the GNU General Public License as
 * published by the Free Software Foundation. This program is distributed
 * in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 */

#include "sigar.h"
#include "sigar_private.h"
#include "sigar_util.h"
#include "sigar_os.h"

#ifdef DARWIN
#include <mach/mach_init.h>
#include <mach/message.h>
#include <mach/kern_return.h>
#include <mach/mach_host.h>
#include <mach/mach_traps.h>
#include <mach/mach_port.h>
#include <mach/task.h>
#include <mach/thread_act.h>
#include <mach/thread_info.h>
#include <mach/vm_map.h>
#include <mach/shared_memory_server.h>
#include <Gestalt.h>
#else
#include <sys/dkstat.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/user.h>
#include <sys/vmmeter.h>
#include <fcntl.h>
#include <stdio.h>
#endif

#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/sockio.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>

#include <dirent.h>
#include <errno.h>

#define NMIB(mib) (sizeof(mib)/sizeof(mib[0]))

#ifdef __FreeBSD__
#  if (__FreeBSD_version >= 500013)
#    define SIGAR_FREEBSD5
#  else
#    define SIGAR_FREEBSD4
#  endif
#endif

#ifdef SIGAR_FREEBSD5

#define KI_FD   ki_fd
#define KI_PID  ki_pid
#define KI_PPID ki_ppid
#define KI_PRI  ki_pri.pri_user
#define KI_NICE ki_nice
#define KI_COMM ki_comm
#define KI_STAT ki_stat
#define KI_UID  ki_ruid
#define KI_GID  ki_rgid
#define KI_EUID ki_svuid
#define KI_EGID ki_svgid
#define KI_SIZE ki_size
#define KI_RSS  ki_rssize
#define KI_TSZ  ki_tsize
#define KI_DSZ  ki_dsize
#define KI_SSZ  ki_ssize
#define KI_FLAG ki_flag
#define KI_START ki_start

#else

#define KI_FD   kp_proc.p_fd
#define KI_PID  kp_proc.p_pid
#define KI_PPID kp_eproc.e_ppid
#define KI_PRI  kp_proc.p_priority
#define KI_NICE kp_proc.p_nice
#define KI_COMM kp_proc.p_comm
#define KI_STAT kp_proc.p_stat
#define KI_UID  kp_eproc.e_pcred.p_ruid
#define KI_GID  kp_eproc.e_pcred.p_rgid
#define KI_EUID kp_eproc.e_pcred.p_svuid
#define KI_EGID kp_eproc.e_pcred.p_svgid
#define KI_SIZE XXX
#define KI_RSS  kp_eproc.e_vm.vm_rssize
#define KI_TSZ  kp_eproc.e_vm.vm_tsize
#define KI_DSZ  kp_eproc.e_vm.vm_dsize
#define KI_SSZ  kp_eproc.e_vm.vm_ssize
#define KI_FLAG kp_eproc.e_flag
#define KI_START kp_proc.p_starttime

#endif

#ifndef DARWIN

#define PROCFS_STATUS(status) \
    ((((status) != SIGAR_OK) && !sigar->proc_mounted) ? \
     SIGAR_ENOTIMPL : status)

static int get_koffsets(sigar_t *sigar)
{
    int i;
    struct nlist klist[] = {
        { "_cp_time" },
        { "_cnt" },
        { NULL }
    };

    if (!sigar->kmem) {
        return SIGAR_EPERM_KMEM;
    }

    kvm_nlist(sigar->kmem, klist);
    if (klist[0].n_type == 0) {
        return errno;
    }

    for (i=0; i<KOFFSET_MAX; i++) {
        sigar->koffsets[i] = klist[i].n_value;
    }

    return SIGAR_OK;
}

static int kread(sigar_t *sigar, void *data, int size, long offset)
{
    if (!sigar->kmem) {
        return SIGAR_EPERM_KMEM;
    }

    if (kvm_read(sigar->kmem, offset, data, size) != size) {
        return errno;
    }

    return SIGAR_OK;
}
#endif

int sigar_os_open(sigar_t **sigar)
{
    int mib[2];
    int ncpu;
    size_t len;
    struct timeval boottime;
#ifndef DARWIN
    struct stat sb;
#endif

    len = sizeof(ncpu);
    mib[0] = CTL_HW;
    mib[1] = HW_NCPU;
    if (sysctl(mib, NMIB(mib), &ncpu,  &len, NULL, 0) < 0) {
        return errno;
    }

    len = sizeof(boottime);
    mib[0] = CTL_KERN;
    mib[1] = KERN_BOOTTIME;
    if (sysctl(mib, NMIB(mib), &boottime, &len, NULL, 0) < 0) {
        return errno;
    }

    *sigar = malloc(sizeof(**sigar));

#ifdef DARWIN
    (*sigar)->mach_port = mach_host_self();
#else
    (*sigar)->kmem = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
    if (stat("/proc/curproc", &sb) < 0) {
        (*sigar)->proc_mounted = 0;
    }
    else {
        (*sigar)->proc_mounted = 1;
    }
#endif

#ifndef DARWIN
    get_koffsets(*sigar);
#endif

    (*sigar)->ncpu = ncpu;

    (*sigar)->boot_time = boottime.tv_sec; /* XXX seems off a bit */

    (*sigar)->pagesize = getpagesize();
#ifdef __FreeBSD__
    (*sigar)->ticks = 100; /* sysconf(_SC_CLK_TCK) == 128 !? */
#else
    (*sigar)->ticks = sysconf(_SC_CLK_TCK);
#endif
    (*sigar)->last_pid = -1;

    (*sigar)->pinfo = NULL;

    return SIGAR_OK;
}

int sigar_os_close(sigar_t *sigar)
{
    if (sigar->pinfo) {
        free(sigar->pinfo);
    }
#ifndef DARWIN
    if (sigar->kmem) {
        kvm_close(sigar->kmem);
    }
#endif
    free(sigar);
    return SIGAR_OK;
}

char *sigar_os_error_string(sigar_t *sigar, int err)
{
    switch (err) {
      case SIGAR_EPERM_KMEM:
        return "Failed to open /dev/kmem for reading";
      case SIGAR_EPROC_NOENT:
        return "/proc filesystem is not mounted";
      default:
        return NULL;
    }
}

#if defined(DARWIN)
static int sigar_vmstat(sigar_t *sigar, vm_statistics_data_t *vmstat)
{
    kern_return_t status;
    mach_msg_type_number_t count = sizeof(*vmstat) / sizeof(integer_t);

    status = host_statistics(sigar->mach_port, HOST_VM_INFO,
                             (host_info_t)vmstat, &count);

    if (status == KERN_SUCCESS) {
        return SIGAR_OK;
    }
    else {
        return errno;
    }
}
#elif defined(__FreeBSD__)
static int sigar_vmstat(sigar_t *sigar, struct vmmeter *vmstat)
{
    int status;
    size_t size = sizeof(unsigned int);

    status = kread(sigar, vmstat, sizeof(*vmstat),
                   sigar->koffsets[KOFFSET_VMMETER]);

    if (status == SIGAR_OK) {
        return SIGAR_OK;
    }

    SIGAR_ZERO(vmstat);

    /* derived from src/usr.bin/vmstat/vmstat.c */
    /* only collect the ones we actually use */
#define GET_VM_STATS(cat, name, used) \
    if (used) sysctlbyname("vm.stats." #cat "." #name, &vmstat->name, &size, NULL, 0)

    /* sys */
    GET_VM_STATS(sys, v_swtch, 0);
    GET_VM_STATS(sys, v_trap, 0);
    GET_VM_STATS(sys, v_syscall, 0);
    GET_VM_STATS(sys, v_intr, 0);
    GET_VM_STATS(sys, v_soft, 0);

    /* vm */
    GET_VM_STATS(vm, v_vm_faults, 0);
    GET_VM_STATS(vm, v_cow_faults, 0);
    GET_VM_STATS(vm, v_cow_optim, 0);
    GET_VM_STATS(vm, v_zfod, 0);
    GET_VM_STATS(vm, v_ozfod, 0);
    GET_VM_STATS(vm, v_swapin, 1);
    GET_VM_STATS(vm, v_swapout, 1);
    GET_VM_STATS(vm, v_swappgsin, 0);
    GET_VM_STATS(vm, v_swappgsout, 0);
    GET_VM_STATS(vm, v_vnodein, 1);
    GET_VM_STATS(vm, v_vnodeout, 1);
    GET_VM_STATS(vm, v_vnodepgsin, 0);
    GET_VM_STATS(vm, v_vnodepgsout, 0);
    GET_VM_STATS(vm, v_intrans, 0);
    GET_VM_STATS(vm, v_reactivated, 0);
    GET_VM_STATS(vm, v_pdwakeups, 0);
    GET_VM_STATS(vm, v_pdpages, 0);
    GET_VM_STATS(vm, v_dfree, 0);
    GET_VM_STATS(vm, v_pfree, 0);
    GET_VM_STATS(vm, v_tfree, 0);
    GET_VM_STATS(vm, v_page_size, 0);
    GET_VM_STATS(vm, v_page_count, 0);
    GET_VM_STATS(vm, v_free_reserved, 0);
    GET_VM_STATS(vm, v_free_target, 0);
    GET_VM_STATS(vm, v_free_min, 0);
    GET_VM_STATS(vm, v_free_count, 1);
    GET_VM_STATS(vm, v_wire_count, 0);
    GET_VM_STATS(vm, v_active_count, 0);
    GET_VM_STATS(vm, v_inactive_target, 0);
    GET_VM_STATS(vm, v_inactive_count, 0);
    GET_VM_STATS(vm, v_cache_count, 0);
    GET_VM_STATS(vm, v_cache_min, 0);
    GET_VM_STATS(vm, v_cache_max, 0);
    GET_VM_STATS(vm, v_pageout_free_min, 0);
    GET_VM_STATS(vm, v_interrupt_free_min, 0);
    GET_VM_STATS(vm, v_forks, 0);
    GET_VM_STATS(vm, v_vforks, 0);
    GET_VM_STATS(vm, v_rforks, 0);
    GET_VM_STATS(vm, v_kthreads, 0);
    GET_VM_STATS(vm, v_forkpages, 0);
    GET_VM_STATS(vm, v_vforkpages, 0);
    GET_VM_STATS(vm, v_rforkpages, 0);
    GET_VM_STATS(vm, v_kthreadpages, 0);
#undef GET_VM_STATS

    return SIGAR_OK;
}
#endif

int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
{
#ifdef DARWIN
    vm_statistics_data_t vmstat;
    uint64_t mem_total;
#else
    unsigned long mem_total;
    struct vmmeter vmstat;
#endif
    int mib[2];
    size_t len;
    int status;

    mib[0] = CTL_HW;

    mib[1] = HW_PAGESIZE;
    len = sizeof(sigar->pagesize);
    if (sysctl(mib, NMIB(mib), &sigar->pagesize, &len, NULL, 0) < 0) {
        return errno;
    }

#ifdef DARWIN
    mib[1] = HW_MEMSIZE;
#else
    mib[1] = HW_PHYSMEM;
#endif
    len = sizeof(mem_total);
    if (sysctl(mib, NMIB(mib), &mem_total, &len, NULL, 0) < 0) {
        return errno;
    }

    mem->total = mem_total;

#if defined(DARWIN)
    if ((status = sigar_vmstat(sigar, &vmstat)) != SIGAR_OK) {
        return status;
    }

    mem->free = vmstat.free_count * sigar->pagesize;
#elif defined(__FreeBSD__)
    if ((status = sigar_vmstat(sigar, &vmstat)) == SIGAR_OK) {
        mem->free = vmstat.v_free_count;
        mem->free *= sigar->pagesize;
    }
#else
    mem->free = -1; /*XXX OpenBSD*/
#endif

    mem->used = mem->total - mem->free;

    sigar_mem_calc_ram(sigar, mem);

    mem->actual_free = mem->free;
    mem->actual_used = mem->used;

    return SIGAR_OK;
}

#define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
    (((sigar_uint64_t)buf.f * (buf.f_bsize / 512)) >> 1)

#define VM_DIR "/private/var/vm"
#define SWAPFILE "swapfile"

#define NL_SWAPBLIST 0
#define NL_SWDEVT 1
#define NL_NSWDEV 2
#define NL_DMMAX 3

#define SWI_MAXMIB 3

#ifdef SIGAR_FREEBSD5
/* code in this function is based on FreeBSD 5.3 kvm_getswapinfo.c */
static int getswapinfo_sysctl(struct kvm_swap *swap_ary,
                              int swap_max) 
{
    int ti, ttl;
    size_t mibi, len, size;
    int soid[SWI_MAXMIB];
    struct xswdev xsd;
    struct kvm_swap tot;
    int unswdev, dmmax;

    /* XXX this can be optimized by using os_open */
    size = sizeof(dmmax);
    if (sysctlbyname("vm.dmmax", &dmmax, &size, NULL, 0) == -1) {
        return errno;
    }

    mibi = SWI_MAXMIB - 1;
    if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) {
        return errno;
    }

    bzero(&tot, sizeof(tot));
    for (unswdev = 0;; unswdev++) {
        soid[mibi] = unswdev;
        len = sizeof(xsd);
        if (sysctl(soid, mibi + 1, &xsd, &len, NULL, 0) == -1) {
            if (errno == ENOENT) {
                break;
            }
            return errno;
        }
#if 0
        if (len != sizeof(xsd)) {
            _kvm_err(kd, kd->program, "struct xswdev has unexpected "
                     "size;  kernel and libkvm out of sync?");
            return -1;
        }
        if (xsd.xsw_version != XSWDEV_VERSION) {
            _kvm_err(kd, kd->program, "struct xswdev version "
                     "mismatch; kernel and libkvm out of sync?");
            return -1;
        }
#endif
        ttl = xsd.xsw_nblks - dmmax;
        if (unswdev < swap_max - 1) {
            bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev]));
            swap_ary[unswdev].ksw_total = ttl;
            swap_ary[unswdev].ksw_used = xsd.xsw_used;
            swap_ary[unswdev].ksw_flags = xsd.xsw_flags;
        }
        tot.ksw_total += ttl;
        tot.ksw_used += xsd.xsw_used;
    }

    ti = unswdev;
    if (ti >= swap_max) {
        ti = swap_max - 1;
    }
    if (ti >= 0) {
        swap_ary[ti] = tot;
    }

    return SIGAR_OK;
}
#else
#define getswapinfo_sysctl(swap_ary, swap_max) SIGAR_ENOTIMPL
#endif

int sigar_swap_get(sigar_t *sigar, sigar_swap_t *swap)
{
    int status;
#if defined(DARWIN)
    DIR *dirp;
    struct dirent *ent;
    char swapfile[SSTRLEN(VM_DIR) + SSTRLEN("/") + SSTRLEN(SWAPFILE) + 12];
    struct stat swapstat;
    struct statfs vmfs;
    vm_statistics_data_t vmstat;

    swap->used = swap->total = swap->free = 0;

    if (!(dirp = opendir(VM_DIR))) {
        return errno;
    }

    /* looking for "swapfile0", "swapfile1", etc. */
    while ((ent = readdir(dirp))) {
        char *ptr = swapfile;

        if ((ent->d_namlen < SSTRLEN(SWAPFILE)+1) || /* n/a, see comment above */
            (ent->d_namlen > SSTRLEN(SWAPFILE)+11)) /* ensure no overflow */
        {
            continue;
        }

        if (!strnEQ(ent->d_name, SWAPFILE, SSTRLEN(SWAPFILE))) {
            continue;
        }
        
        /* sprintf(swapfile, "%s/%s", VM_DIR, ent->d_name) */

        memcpy(ptr, VM_DIR, SSTRLEN(VM_DIR));
        ptr += SSTRLEN(VM_DIR);

        *ptr++ = '/';

        memcpy(ptr, ent->d_name, ent->d_namlen+1);

        if (stat(swapfile, &swapstat) < 0) {
            continue;
        }

        swap->used += swapstat.st_size;
    }

    closedir(dirp);

    if (statfs(VM_DIR, &vmfs) < 0) {
        return errno;
    }

    swap->total = SIGAR_FS_BLOCKS_TO_BYTES(vmfs, f_bfree) + swap->used;

    swap->free = swap->total - swap->used;

    if ((status = sigar_vmstat(sigar, &vmstat)) != SIGAR_OK) {
        return status;
    }
    swap->page_in = vmstat.pageins;
    swap->page_out = vmstat.pageouts;
#elif defined(__FreeBSD__)
    struct kvm_swap kswap[1];
    struct vmmeter vmstat;

    if (getswapinfo_sysctl(kswap, 1) != SIGAR_OK) {
        if (!sigar->kmem) {
            return SIGAR_EPERM_KMEM;
        }

        if (kvm_getswapinfo(sigar->kmem, kswap, 1, 0) < 0) {
            return errno;
        }
    }

    if (kswap[0].ksw_total == 0) {
        swap->total = 0;
        swap->used  = 0;
        swap->free  = 0;
        return SIGAR_OK;
    }

    swap->total = kswap[0].ksw_total * sigar->pagesize;
    swap->used  = kswap[0].ksw_used * sigar->pagesize;
    swap->free  = swap->total - swap->used;

    if ((status = sigar_vmstat(sigar, &vmstat)) == SIGAR_OK) {
        swap->page_in = vmstat.v_swapin + vmstat.v_vnodein;
        swap->page_out = vmstat.v_swapout + vmstat.v_vnodeout;
    }
    else {
        swap->page_in = swap->page_out = -1;
    }
#else
    /*XXX OpenBSD*/
#endif

    return SIGAR_OK;
}

int sigar_cpu_get(sigar_t *sigar, sigar_cpu_t *cpu)
{
#if defined(DARWIN)
    kern_return_t status;
    mach_msg_type_number_t count = HOST_CPU_LOAD_INFO_COUNT;
    host_cpu_load_info_data_t cpuload;

    status = host_statistics(sigar->mach_port, HOST_CPU_LOAD_INFO,
                             (host_info_t)&cpuload, &count);

    if (status != KERN_SUCCESS) {
        return errno;
    }

    cpu->user = SIGAR_TICK2MSEC(cpuload.cpu_ticks[CPU_STATE_USER]);
    cpu->sys  = SIGAR_TICK2MSEC(cpuload.cpu_ticks[CPU_STATE_SYSTEM]);
    cpu->idle = SIGAR_TICK2MSEC(cpuload.cpu_ticks[CPU_STATE_IDLE]);
    cpu->nice = SIGAR_TICK2MSEC(cpuload.cpu_ticks[CPU_STATE_NICE]);
    cpu->wait = 0; /*N/A*/
    cpu->total = cpu->user + cpu->nice + cpu->sys + cpu->idle;

#elif defined(__FreeBSD__)
    int status;
    unsigned long cp_time[CPUSTATES];
    size_t size = sizeof(cp_time);

    /* try sysctl first, does not require /dev/kmem perms */
    if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) == -1) {
        status = kread(sigar, &cp_time, sizeof(cp_time),
                       sigar->koffsets[KOFFSET_CPUINFO]);
    }
    else {
        status = SIGAR_OK;
    }

    if (status != SIGAR_OK) {
        return status;
    }

    cpu->user = SIGAR_TICK2MSEC(cp_time[CP_USER]);
    cpu->nice = SIGAR_TICK2MSEC(cp_time[CP_NICE]);
    cpu->sys  = SIGAR_TICK2MSEC(cp_time[CP_SYS] + cp_time[CP_INTR]);
    cpu->idle = SIGAR_TICK2MSEC(cp_time[CP_IDLE]);
    cpu->wait = 0; /*N/A*/
    cpu->total = cpu->user + cpu->nice + cpu->sys + cpu->idle;
#else
    /*XXX OpenBSD*/
#endif

    return SIGAR_OK;
}

int sigar_cpu_list_get(sigar_t *sigar, sigar_cpu_list_t *cpulist)
{
#ifdef DARWIN
    kern_return_t status;
    mach_msg_type_number_t count;
    processor_cpu_load_info_data_t *cpuload;
    natural_t i, ncpu;

    status = host_processor_info(sigar->mach_port,
                                 PROCESSOR_CPU_LOAD_INFO,
                                 &ncpu,
                                 (processor_info_array_t*)&cpuload,
                                 &count);

    if (status != KERN_SUCCESS) {
        return errno;
    }

    sigar_cpu_list_create(cpulist);

    for (i=0; i<ncpu; i++) {
        sigar_cpu_t *cpu;

        SIGAR_CPU_LIST_GROW(cpulist);

        cpu = &cpulist->data[cpulist->number++];

        cpu->user = SIGAR_TICK2MSEC(cpuload[i].cpu_ticks[CPU_STATE_USER]);
        cpu->sys  = SIGAR_TICK2MSEC(cpuload[i].cpu_ticks[CPU_STATE_SYSTEM]);
        cpu->idle = SIGAR_TICK2MSEC(cpuload[i].cpu_ticks[CPU_STATE_IDLE]);
        cpu->nice = SIGAR_TICK2MSEC(cpuload[i].cpu_ticks[CPU_STATE_NICE]);
        cpu->wait = 0; /*N/A*/
        cpu->total = cpu->user + cpu->nice + cpu->sys + cpu->idle;
    }

    vm_deallocate(mach_task_self(), (vm_address_t)cpuload, count);

    return SIGAR_OK;
#else
    int status, i;
    sigar_cpu_t *cpu;

    sigar_cpu_list_create(cpulist);

    /* XXX howto multi cpu in freebsd?
     * for now just report all metrics on the 1st cpu
     * 0's for the rest
     */
    cpu = &cpulist->data[cpulist->number++];

    status = sigar_cpu_get(sigar, cpu);
    if (status != SIGAR_OK) {
        return status;
    }

    for (i=1; i<sigar->ncpu; i++) {
        SIGAR_CPU_LIST_GROW(cpulist);

        cpu = &cpulist->data[cpulist->number++];
        SIGAR_ZERO(cpu);
    }

    return SIGAR_OK;
#endif
}

int sigar_uptime_get(sigar_t *sigar,
                     sigar_uptime_t *uptime)
{
    uptime->uptime   = time(NULL) - sigar->boot_time;

    return SIGAR_OK;
}

int sigar_loadavg_get(sigar_t *sigar,
                      sigar_loadavg_t *loadavg)
{
    getloadavg(loadavg->loadavg, 3);

    return SIGAR_OK;
}

#ifndef KERN_PROC_PROC
/* freebsd 4.x */
#define KERN_PROC_PROC KERN_PROC_ALL
#endif

int sigar_os_proc_list_get(sigar_t *sigar,
                           sigar_proc_list_t *proclist)
{
#if defined(DARWIN) || defined(SIGAR_FREEBSD5)
    int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PROC, 0 };
    int i, num;
    size_t len;
    struct kinfo_proc *proc;

    if (sysctl(mib, NMIB(mib), NULL, &len, NULL, 0) < 0) {
        return errno;
    }

    proc = malloc(len);

    if (sysctl(mib, NMIB(mib), proc, &len, NULL, 0) < 0) {
        free(proc);
        return errno;
    }

    num = len/sizeof(*proc);

    for (i=0; i<num; i++) {
        if (proc[i].KI_FLAG & P_SYSTEM) {
            continue;
        }
        SIGAR_PROC_LIST_GROW(proclist);
        proclist->data[proclist->number++] = proc[i].KI_PID;
    }

    free(proc);

    return SIGAR_OK;
#else
    int i, num;
    struct kinfo_proc *proc;

    if (!sigar->kmem) {
        return SIGAR_EPERM_KMEM;
    }

    proc = kvm_getprocs(sigar->kmem, KERN_PROC_PROC, 0, &num);

    for (i=0; i<num; i++) {
        if (proc[i].KI_FLAG & P_SYSTEM) {
            continue;
        }
        SIGAR_PROC_LIST_GROW(proclist);
        proclist->data[proclist->number++] = proc[i].KI_PID;
    }
#endif

    return SIGAR_OK;
}

static int sigar_get_pinfo(sigar_t *sigar, sigar_pid_t pid)
{
    int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, 0 };
    size_t len = sizeof(*sigar->pinfo);
    time_t timenow = time(NULL);
    mib[3] = pid;

    if (sigar->pinfo == NULL) {
        sigar->pinfo = malloc(len);
    }

    if (sigar->last_pid == pid) {
        if ((timenow - sigar->last_getprocs) < SIGAR_LAST_PROC_EXPIRE) {
            return SIGAR_OK;
        }
    }

    sigar->last_pid = pid;
    sigar->last_getprocs = timenow;

    if (sysctl(mib, NMIB(mib), sigar->pinfo, &len, NULL, 0) < 0) {
        return errno;
    }

    return SIGAR_OK;
}

int sigar_proc_mem_get(sigar_t *sigar, sigar_pid_t pid,
                       sigar_proc_mem_t *procmem)
{
#ifdef DARWIN
    mach_port_t task, self = mach_task_self();
    kern_return_t status;
    task_basic_info_data_t info;
    task_events_info_data_t events;
    mach_msg_type_number_t count;

    status = task_for_pid(self, pid, &task);

    if (status != KERN_SUCCESS) {
        return errno;
    }

    count = TASK_BASIC_INFO_COUNT;
    status = task_info(task, TASK_BASIC_INFO, (task_info_t)&info, &count);
    if (status != KERN_SUCCESS) {
        return errno;
    }

    count = TASK_EVENTS_INFO_COUNT;
    status = task_info(task, TASK_EVENTS_INFO, (task_info_t)&events, &count);
    if (status == KERN_SUCCESS) {
        procmem->page_faults = events.faults;
    }
    else {
        procmem->page_faults = SIGAR_FIELD_NOTIMPL;
    }

    procmem->minor_faults = SIGAR_FIELD_NOTIMPL;
    procmem->major_faults = SIGAR_FIELD_NOTIMPL;

    if (task != self) {
        mach_port_deallocate(self, task);
    }

    procmem->size     = info.virtual_size;
    procmem->resident = info.resident_size;
    procmem->share    = SIGAR_FIELD_NOTIMPL;

    return SIGAR_OK;
#else
    int status = sigar_get_pinfo(sigar, pid);
    struct kinfo_proc *pinfo = sigar->pinfo;

    if (status != SIGAR_OK) {
        return status;
    }

    procmem->size =
        (pinfo->KI_TSZ + pinfo->KI_DSZ + pinfo->KI_SSZ) * sigar->pagesize;

    procmem->resident = pinfo->KI_RSS * sigar->pagesize;

    procmem->share = SIGAR_FIELD_NOTIMPL;

    procmem->page_faults  = SIGAR_FIELD_NOTIMPL;
    procmem->minor_faults = SIGAR_FIELD_NOTIMPL;
    procmem->major_faults = SIGAR_FIELD_NOTIMPL;

    return SIGAR_OK;
#endif
}

int sigar_proc_cred_get(sigar_t *sigar, sigar_pid_t pid,
                        sigar_proc_cred_t *proccred)
{
    int status = sigar_get_pinfo(sigar, pid);
    struct kinfo_proc *pinfo = sigar->pinfo;

    if (status != SIGAR_OK) {
        return status;
    }

    proccred->uid  = pinfo->KI_UID;
    proccred->gid  = pinfo->KI_GID;
    proccred->euid = pinfo->KI_EUID;
    proccred->egid = pinfo->KI_EGID;

    return SIGAR_OK;
}

#define tv2msec(tv) \
   (((sigar_uint64_t)tv.tv_sec * SIGAR_MSEC) + (((sigar_uint64_t)tv.tv_usec) / 1000))

#ifdef DARWIN
#define tval2msec(tval) \
   ((tval.seconds * SIGAR_MSEC) + (tval.microseconds / 1000))

#define tval2nsec(tval) \
    (SIGAR_SEC2NANO((tval).seconds) + SIGAR_MICROSEC2NANO((tval).microseconds))

static int get_proc_times(sigar_pid_t pid, sigar_proc_time_t *time)
{
    unsigned int count;
    time_value_t utime = {0, 0}, stime = {0, 0};
    task_basic_info_data_t ti;
    task_thread_times_info_data_t tti;
    task_port_t task, self = mach_task_self();
    kern_return_t status;
    
    status = task_for_pid(self, pid, &task);
    if (status != KERN_SUCCESS) {
        return errno;
    }

    count = TASK_BASIC_INFO_COUNT;
    status = task_info(task, TASK_BASIC_INFO,
                       (task_info_t)&ti, &count);
    if (status != KERN_SUCCESS) {
        if (task != self) {
            mach_port_deallocate(self, task);
        }
        return errno;
    }

    count = TASK_THREAD_TIMES_INFO_COUNT;
    status = task_info(task, TASK_THREAD_TIMES_INFO,
                       (task_info_t)&tti, &count);
    if (status != KERN_SUCCESS) {
        if (task != self) {
            mach_port_deallocate(self, task);
        }
        return errno;
    }

    time_value_add(&utime, &ti.user_time);
    time_value_add(&stime, &ti.system_time);
    time_value_add(&utime, &tti.user_time);
    time_value_add(&stime, &tti.system_time);

    time->user = tval2msec(utime);
    time->sys  = tval2msec(stime);
    time->total = time->user + time->sys;

    return SIGAR_OK;
}
#endif

int sigar_proc_time_get(sigar_t *sigar, sigar_pid_t pid,
                        sigar_proc_time_t *proctime)
{
#ifdef SIGAR_FREEBSD4
    struct user user;
#endif
    int status = sigar_get_pinfo(sigar, pid);
    struct kinfo_proc *pinfo = sigar->pinfo;

    if (status != SIGAR_OK) {
        return status;
    }

#if defined(DARWIN)
    if ((status = get_proc_times(pid, proctime)) != SIGAR_OK) {
        return status;
    }
    proctime->start_time = tv2msec(pinfo->KI_START);
#elif defined(SIGAR_FREEBSD5)
    proctime->user  = tv2msec(pinfo->ki_rusage.ru_utime);
    proctime->sys   = tv2msec(pinfo->ki_rusage.ru_stime);
    proctime->total = proctime->user + proctime->sys;
    proctime->start_time = tv2msec(pinfo->KI_START);
#elif defined(SIGAR_FREEBSD4)
    if (!sigar->kmem) {
        return SIGAR_EPERM_KMEM;
    }

    status = kread(sigar, &user, sizeof(user),
                   (u_long)pinfo->kp_proc.p_addr);
    if (status != SIGAR_OK) {
        return status;
    }

    proctime->user  = tv2msec(user.u_stats.p_ru.ru_utime);
    proctime->sys   = tv2msec(user.u_stats.p_ru.ru_stime);
    proctime->total = proctime->user + proctime->sys;
    proctime->start_time = tv2msec(user.u_stats.p_start);
#else
    /*XXX OpenBSD*/
#endif

    return SIGAR_OK;
}

#ifdef DARWIN
static int sigar_proc_threads_get(sigar_t *sigar, sigar_pid_t pid,
                                  sigar_proc_state_t *procstate)
{
    mach_port_t task, self = mach_task_self();
    kern_return_t status;
    thread_array_t threads;
    mach_msg_type_number_t count;

    status = task_for_pid(self, pid, &task);
    if (status != KERN_SUCCESS) {
        return errno;
    }

    status = task_threads(task, &threads, &count);
    if (status != KERN_SUCCESS) {
        return errno;
    }

    procstate->threads = count;
		
    vm_deallocate(self, (vm_address_t)threads, sizeof(thread_t) * count);

    return SIGAR_OK;
}
#endif

int sigar_proc_state_get(sigar_t *sigar, sigar_pid_t pid,
                         sigar_proc_state_t *procstate)
{
    int status = sigar_get_pinfo(sigar, pid);
    struct kinfo_proc *pinfo = sigar->pinfo;
    
    if (status != SIGAR_OK) {
        return status;
    }

    SIGAR_SSTRCPY(procstate->name, pinfo->KI_COMM);
    procstate->ppid     = pinfo->KI_PPID;
    procstate->priority = pinfo->KI_PRI;
    procstate->nice     = pinfo->KI_NICE;
    procstate->tty      = SIGAR_FIELD_NOTIMPL; /*XXX*/
    procstate->threads  = SIGAR_FIELD_NOTIMPL;
    procstate->processor = SIGAR_FIELD_NOTIMPL;

#ifdef DARWIN
    sigar_proc_threads_get(sigar, pid, procstate);
#endif

    switch (pinfo->KI_STAT) {
      case SIDL:
        procstate->state = 'D';
        break;
      case SRUN:
        procstate->state = 'R';
        break;
      case SSLEEP:
        procstate->state = 'S';
        break;
      case SSTOP:
        procstate->state = 'T';
        break;
      case SZOMB:
        procstate->state = 'Z';
        break;
    }

    return SIGAR_OK;
}

#if defined(DARWIN)
typedef struct {
    char buffer[8096], *ptr, *end;
    int count;
} sigar_kern_proc_args_t;

/* re-usable hack for use by proc_args and proc_env */
static int sigar_kern_proc_args_get(sigar_pid_t pid,
                                    char *exe,
                                    sigar_kern_proc_args_t *kargs)
{
    /*
     * derived from:
     * http://darwinsource.opendarwin.org/10.4.1/adv_cmds-79.1/ps.tproj/print.c
     */
    int mib[3], len;
    size_t size = sizeof(kargs->buffer);
    char *args = kargs->buffer;

    mib[0] = CTL_KERN;
    mib[1] = KERN_PROCARGS2;
    mib[2] = pid;

    if (sysctl(mib, NMIB(mib), args, &size, NULL, 0) < 0) {
        return errno;
    }

    kargs->end = &args[size];

    memcpy(&kargs->count, args, sizeof(kargs->count));
    kargs->ptr = args + sizeof(kargs->count);

    len = strlen(kargs->ptr);
    if (exe) {
        memcpy(exe, kargs->ptr, len+1);
    }
    kargs->ptr += len+1;

    if (kargs->ptr == kargs->end) {
        return exe ? SIGAR_OK : ENOENT;
    }

    for (; kargs->ptr < kargs->end; kargs->ptr++) {
        if (*kargs->ptr != '\0') {
            break; /* start of argv[0] */
        }
    }

    if (kargs->ptr == kargs->end) {
        return exe ? SIGAR_OK : ENOENT;
    }

    return SIGAR_OK;
}

static int kern_proc_args_skip_argv(sigar_kern_proc_args_t *kargs)
{
    char *ptr = kargs->ptr;
    char *end = kargs->end;
    int count = kargs->count;

    /* skip over argv */
    while ((ptr < end) && (count-- > 0)) {
        int alen = strlen(ptr)+1;

        ptr += alen;
    }

    kargs->ptr = ptr;
    kargs->end = end;
    kargs->count = 0;

    if (ptr >= end) {
        return ENOENT;
    }

    return SIGAR_OK;
}
#endif

int sigar_os_proc_args_get(sigar_t *sigar, sigar_pid_t pid,
                           sigar_proc_args_t *procargs)
{
#if defined(DARWIN)
    int status, count;
    sigar_kern_proc_args_t kargs;
    char *ptr, *end;

    status = sigar_kern_proc_args_get(pid, NULL, &kargs);
    if (status != SIGAR_OK) {
        return status;
    }

    count = kargs.count;
    ptr = kargs.ptr;
    end = kargs.end;

    while ((ptr < end) && (count-- > 0)) {
        int slen = strlen(ptr);
        int alen = slen+1;
        char *arg;

        /*
         * trim trailing whitespace.
         * seen w/ postgresql, probably related
         * to messing with argv[0]
         */
        while (*(ptr + (slen-1)) == ' ') {
            if (--slen <= 0) {
                break;
            }
        }

        arg = malloc(slen+1);

        SIGAR_PROC_ARGS_GROW(procargs);
        memcpy(arg, ptr, slen);
        *(arg+slen) = '\0';

        procargs->data[procargs->number++] = arg;

        ptr += alen;
    }

    return SIGAR_OK;
#else
    /* ARG_MAX in FreeBSD 6.0 == 262144, which blows up the stack */
#define SIGAR_ARG_MAX 65536
    char buffer[SIGAR_ARG_MAX+1], *ptr=buffer;
    size_t len = sizeof(buffer);
    int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_ARGS, 0 };

    mib[3] = pid;

    if (sysctl(mib, NMIB(mib), buffer, &len, NULL, 0) < 0) {
        return errno;
    }

    if (len == 0) {
        procargs->number = 0;
        return SIGAR_OK;
    }

    buffer[len] = '\0';

    while (len > 0) {
        int alen = strlen(ptr)+1;
        char *arg = malloc(alen);

        SIGAR_PROC_ARGS_GROW(procargs);
        memcpy(arg, ptr, alen);

        procargs->data[procargs->number++] = arg;

        len -= alen;
        if (len > 0) {
            ptr += alen;
        }
    }

    return SIGAR_OK;
#endif
}

int sigar_proc_env_get(sigar_t *sigar, sigar_pid_t pid,
                       sigar_proc_env_t *procenv)
{
#ifdef DARWIN
    int status, count;
    sigar_kern_proc_args_t kargs;
    char *ptr, *end;

    status = sigar_kern_proc_args_get(pid, NULL, &kargs);
    if (status != SIGAR_OK) {
        return status;
    }

    status = kern_proc_args_skip_argv(&kargs);
    if (status != SIGAR_OK) {
        return status;
    }

    count = kargs.count;
    ptr = kargs.ptr;
    end = kargs.end;

    /* into environ */
    while (ptr < end) {
        char *val = strchr(ptr, '=');
        int klen, vlen, status;
        char key[256]; /* XXX is there a max key size? */

        if (val == NULL) {
            /* not key=val format */
            break;
        }

        klen = val - ptr;
        SIGAR_SSTRCPY(key, ptr);
        key[klen] = '\0';
        ++val;

        vlen = strlen(val);
        status = procenv->env_getter(procenv->data,
                                     key, klen, val, vlen);

        if (status != SIGAR_OK) {
            /* not an error; just stop iterating */
            break;
        }

        ptr += (klen + 1 + vlen + 1);

        if (*ptr == '\0') {
            break;
        }
    }

    return SIGAR_OK;
#else
    char **env;
    struct kinfo_proc *pinfo;
    int num;

    if (!sigar->kmem) {
        return SIGAR_EPERM_KMEM;
    }

    pinfo = kvm_getprocs(sigar->kmem, KERN_PROC_PID, pid, &num);
    if (!pinfo || (num < 1)) {
        return errno;
    }

    if (!(env = kvm_getenvv(sigar->kmem, pinfo, 9086))) {
        return errno;
    }

    while (*env) {
        char *ptr = *env++;
        char *val = strchr(ptr, '=');
        int klen, vlen, status;
        char key[128]; /* XXX is there a max key size? */

        if (val == NULL) {
            /* not key=val format */
            procenv->env_getter(procenv->data, ptr, strlen(ptr), NULL, 0);
            break;
        }

        klen = val - ptr;
        SIGAR_SSTRCPY(key, ptr);
        key[klen] = '\0';
        ++val;

        vlen = strlen(val);
        status = procenv->env_getter(procenv->data,
                                     key, klen, val, vlen);

        if (status != SIGAR_OK) {
            /* not an error; just stop iterating */
            break;
        }

        ptr += (klen + 1 + vlen + 1);
    }

    return SIGAR_OK;
#endif
}

int sigar_proc_fd_get(sigar_t *sigar, sigar_pid_t pid,
                      sigar_proc_fd_t *procfd)
{
#ifdef __FreeBSD__
    int status;
    struct kinfo_proc *pinfo;
    struct filedesc filed;
#if 0
    struct file **ofiles;
    int nfiles, i;
    size_t size;
#endif
    if (!sigar->kmem) {
        return SIGAR_EPERM_KMEM;
    }

    if ((status = sigar_get_pinfo(sigar, pid)) != SIGAR_OK) {
        return status;
    }
    pinfo = sigar->pinfo;

    status = kread(sigar, &filed, sizeof(filed), (u_long)pinfo->KI_FD);
    if (status != SIGAR_OK) {
        return status;
    }
#if 0
    nfiles = filed.fd_lastfile+1;
    size = sizeof(*ofiles) * nfiles;
    ofiles = malloc(size);
    status = kread(sigar, ofiles, size, (u_long)filed.fd_ofiles);
    if (status != SIGAR_OK) {
        free(ofiles);
        return status;
    }

    procfd->total = 0;
    for (i=0; i<filed.fd_lastfile; i++) {
        if (!ofiles[i]) {
            continue;
        }
        procfd->total++;
    }

    free(ofiles);
#else
    /* seems the same as the above */
    procfd->total = filed.fd_lastfile;
#endif

    return SIGAR_OK;
#else
    return SIGAR_ENOTIMPL;
#endif
}

int sigar_proc_exe_get(sigar_t *sigar, sigar_pid_t pid,
                       sigar_proc_exe_t *procexe)
{
#ifdef DARWIN
    int status;
    sigar_kern_proc_args_t kargs;

    status = sigar_kern_proc_args_get(pid, procexe->name, &kargs);
    if (status != SIGAR_OK) {
        return status;
    }

    procexe->cwd[0] = '\0';
    procexe->root[0] = '\0';

    /* attempt to determine cwd from $PWD */
    status = kern_proc_args_skip_argv(&kargs);
    if (status == SIGAR_OK) {
        char *ptr = kargs.ptr;
        char *end = kargs.end;

        /* into environ */
        while (ptr < end) {
            int len = strlen(ptr);

            if ((len > 4) &&
                (ptr[0] == 'P') &&
                (ptr[1] == 'W') &&
                (ptr[2] == 'D') &&
                (ptr[3] == '='))
            {
                memcpy(procexe->cwd, ptr+4, len-3);
                break;
            }

            ptr += len+1;
        }
    }

    return SIGAR_OK;
#else
    int len;
    char name[1024];

    procexe->cwd[0] = '\0';
    procexe->root[0] = '\0';

    (void)SIGAR_PROC_FILENAME(name, pid, "/file");

    if ((len = readlink(name, procexe->name,
                        sizeof(procexe->name)-1)) < 0)
    {
        return PROCFS_STATUS(errno);
    }

    procexe->name[len] = '\0';

    return SIGAR_OK;
#endif
}

int sigar_proc_modules_get(sigar_t *sigar, sigar_pid_t pid,
                           sigar_proc_modules_t *procmods)
{
    return SIGAR_ENOTIMPL;
}

#define SIGAR_MICROSEC2NANO(s) \
    ((sigar_uint64_t)(s) * (sigar_uint64_t)1000)

#define TIME_NSEC(t) \
    (SIGAR_SEC2NANO((t).tv_sec) + SIGAR_MICROSEC2NANO((t).tv_usec))

int sigar_thread_cpu_get(sigar_t *sigar,
                         sigar_uint64_t id,
                         sigar_thread_cpu_t *cpu)
{
#ifdef DARWIN
    mach_port_t self = mach_thread_self();
    thread_basic_info_data_t info;
    mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
    kern_return_t status;

    status = thread_info(self, THREAD_BASIC_INFO,
                         (thread_info_t)&info, &count);
    if (status != KERN_SUCCESS) {
        return errno;
    }

    mach_port_deallocate(mach_task_self(), self);

    cpu->user  = tval2nsec(info.user_time);
    cpu->sys   = tval2nsec(info.system_time);
    cpu->total = cpu->user + cpu->sys;
#else
    /* XXX this is not per-thread, it is for the whole-process.
     * just want to use for the shell time command at the moment.
     */
    struct rusage usage;
    getrusage(RUSAGE_SELF, &usage);

    cpu->user  = TIME_NSEC(usage.ru_utime);
    cpu->sys   = TIME_NSEC(usage.ru_stime);
    cpu->total = TIME_NSEC(usage.ru_utime) + TIME_NSEC(usage.ru_stime);
#endif

    return SIGAR_OK;
}

int sigar_os_fs_type_get(sigar_file_system_t *fsp)
{
    char *type = fsp->sys_type_name;

    /* see sys/disklabel.h */
    switch (*type) {
      case 'h':
        if (strEQ(type, "hfs")) {
            fsp->type = SIGAR_FSTYPE_LOCAL_DISK;
        }
        break;
      case 'u':
        if (strEQ(type, "ufs")) {
            fsp->type = SIGAR_FSTYPE_LOCAL_DISK;
        }
        break;
    }

    return fsp->type;
}

int sigar_file_system_list_get(sigar_t *sigar,
                               sigar_file_system_list_t *fslist)
{
    struct statfs *fs;
    int num, i;
    long len;
    int is_debug = SIGAR_LOG_IS_DEBUG(sigar);

    if ((num = getfsstat(NULL, 0, MNT_NOWAIT)) < 0) {
        return errno;
    }

    len = sizeof(*fs) * num;
    fs = malloc(len);

    if ((num = getfsstat(fs, len, MNT_NOWAIT)) < 0) {
        return errno;
    }

    sigar_file_system_list_create(fslist);

    for (i=0; i<num; i++) {
        sigar_file_system_t *fsp;

#ifdef MNT_AUTOMOUNTED
        if (fs[i].f_flags & MNT_AUTOMOUNTED) {
            if (is_debug) {
                sigar_log_printf(sigar, SIGAR_LOG_DEBUG,
                                 "[file_system_list] skipping automounted %s: %s",
                                 fs[i].f_fstypename, fs[i].f_mntonname);
            }
            continue;
        }
#endif

#ifdef MNT_RDONLY
        if (fs[i].f_flags & MNT_RDONLY) {
            /* e.g. ftp mount or .dmg image */
            if (is_debug) {
                sigar_log_printf(sigar, SIGAR_LOG_DEBUG,
                                 "[file_system_list] skipping readonly %s: %s",
                                 fs[i].f_fstypename, fs[i].f_mntonname);
            }
            continue;
        }
#endif

        SIGAR_FILE_SYSTEM_LIST_GROW(fslist);

        fsp = &fslist->data[fslist->number++];

        SIGAR_SSTRCPY(fsp->dir_name, fs[i].f_mntonname);
        SIGAR_SSTRCPY(fsp->dev_name, fs[i].f_mntfromname);
        SIGAR_SSTRCPY(fsp->sys_type_name, fs[i].f_fstypename);
        sigar_fs_type_init(fsp);
    }

    return SIGAR_OK;
}

int sigar_file_system_usage_get(sigar_t *sigar,
                                const char *dirname,
                                sigar_file_system_usage_t *fsusage)
{
    struct statfs buf;

    if (statfs(dirname, &buf) < 0) {
        return errno;
    }

    fsusage->total = SIGAR_FS_BLOCKS_TO_BYTES(buf, f_blocks);
    fsusage->free  = SIGAR_FS_BLOCKS_TO_BYTES(buf, f_bfree);
    fsusage->avail = SIGAR_FS_BLOCKS_TO_BYTES(buf, f_bavail);
    fsusage->used  = fsusage->total - fsusage->free;
    fsusage->files = buf.f_files;
    fsusage->free_files = buf.f_ffree;
    fsusage->use_percent = sigar_file_system_usage_calc_used(sigar, fsusage);

#ifdef __FreeBSD__
    fsusage->disk_reads  = buf.f_syncreads + buf.f_asyncreads;
    fsusage->disk_writes = buf.f_syncwrites + buf.f_asyncwrites;
    fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
    fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
    fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
#else
    SIGAR_DISK_STATS_NOTIMPL(fsusage);
#endif

    return SIGAR_OK;
}

#ifdef DARWIN
#define CTL_HW_FREQ "hw.cpufrequency"
#else
/* XXX FreeBSD 5.x+ only? */ 
#define CTL_HW_FREQ "machdep.tsc_freq"
#endif

int sigar_cpu_info_list_get(sigar_t *sigar,
                            sigar_cpu_info_list_t *cpu_infos)
{
    int i;
    unsigned int mhz;
    int cache_size=SIGAR_FIELD_NOTIMPL;
    size_t size;
    char model[128], vendor[128], *ptr;

    size = sizeof(mhz);

#if defined(DARWIN)
    {
        int mib[] = { CTL_HW, HW_CPU_FREQ };
        size = sizeof(mhz);
        if (sysctl(mib, NMIB(mib), &mhz, &size, NULL, 0) < 0) {
            mhz = SIGAR_FIELD_NOTIMPL;
        }
    }
#elif defined(__FreeBSD__)
    if (sysctlbyname(CTL_HW_FREQ, &mhz, &size, NULL, 0) < 0) {
        mhz = SIGAR_FIELD_NOTIMPL;
    }
#else
    /*XXX OpenBSD*/
    mhz = SIGAR_FIELD_NOTIMPL;
#endif

    if (mhz != SIGAR_FIELD_NOTIMPL) {
        mhz /= 1000000;
    }

#ifdef __OpenBSD__
    strcpy(model, "Unknown");
#else
    size = sizeof(model);
    if (sysctlbyname("hw.model", &model, &size, NULL, 0) < 0) {
        int mib[] = { CTL_HW, HW_MODEL };
        size = sizeof(model);
        if (sysctl(mib, NMIB(mib), &model[0], &size, NULL, 0) < 0) {
#ifdef DARWIN
            strcpy(model, "powerpc");
#else
            strcpy(model, "Unknown");
#endif
        }
    }
#endif

    if (mhz == SIGAR_FIELD_NOTIMPL) {
        /* freebsd4 */
        mhz = sigar_cpu_mhz_from_model(model);
    }

#ifdef DARWIN
    size = sizeof(vendor);
    if (sysctlbyname("machdep.cpu.vendor", &vendor, &size, NULL, 0) < 0) {
        SIGAR_SSTRCPY(vendor, "Apple");
    }
    else {
        /* GenuineIntel -> Intel */ 
        if (strstr(vendor, "Intel")) {
            SIGAR_SSTRCPY(vendor, "Intel");
        }
    }
#endif

    if ((ptr = strchr(model, ' '))) {
        *ptr = '\0';
        if (strstr(model, "Intel")) {
            SIGAR_SSTRCPY(vendor, "Intel");
        }
        else if (strstr(model, "AMD")) {
            SIGAR_SSTRCPY(vendor, "AMD");
        }
        else {
            SIGAR_SSTRCPY(vendor, "Unknown");
        }
        SIGAR_SSTRCPY(model, ptr+1);
    }

#ifdef DARWIN
    {
        int mib[] = { CTL_HW, HW_L2CACHESIZE }; /* in bytes */
        size = sizeof(cache_size);
        if (sysctl(mib, NMIB(mib), &cache_size, &size, NULL, 0) < 0) {
            cache_size = SIGAR_FIELD_NOTIMPL;
        }
        else {
            cache_size /= 1024; /* convert to KB */
        }
    }
#endif

    sigar_cpu_info_list_create(cpu_infos);

    for (i=0; i<sigar->ncpu; i++) {
        sigar_cpu_info_t *info;

        SIGAR_CPU_INFO_LIST_GROW(cpu_infos);

        info = &cpu_infos->data[cpu_infos->number++];

        SIGAR_SSTRCPY(info->vendor, vendor);
        SIGAR_SSTRCPY(info->model, model);
        sigar_cpu_model_adjust(sigar, info);

        info->mhz = mhz;
        info->cache_size = cache_size;
    }

    return SIGAR_OK;
}

#define rt_s_addr(sa) ((struct sockaddr_in *)(sa))->sin_addr.s_addr

#ifndef SA_SIZE
#define SA_SIZE(sa)                                             \
    (  (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ?      \
        sizeof(long)            :                               \
        1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
#endif

int sigar_net_route_list_get(sigar_t *sigar,
                             sigar_net_route_list_t *routelist)
{
    size_t needed;
    int bit;
    char *buf, *next, *lim;
    struct rt_msghdr *rtm;
    int mib[6] = { CTL_NET, PF_ROUTE, 0, 0, NET_RT_DUMP, 0 };

    if (sysctl(mib, NMIB(mib), NULL, &needed, NULL, 0) < 0) {
        return errno;
    }

    buf = malloc(needed);

    if (sysctl(mib, NMIB(mib), buf, &needed, NULL, 0) < 0) {
        free(buf);
        return errno;
    }

    sigar_net_route_list_create(routelist);

    lim = buf + needed;
    for (next = buf; next < lim; next += rtm->rtm_msglen) {
        struct sockaddr *sa;
        sigar_net_route_t *route;
        rtm = (struct rt_msghdr *)next;

        if (rtm->rtm_type != RTM_GET) {
            continue;
        }

        sa = (struct sockaddr *)(rtm + 1);

        if (sa->sa_family != AF_INET) {
            continue;
        }

        SIGAR_NET_ROUTE_LIST_GROW(routelist);
        route = &routelist->data[routelist->number++];
        SIGAR_ZERO(route);

        route->flags = rtm->rtm_flags;

        for (bit=RTA_DST;
             bit && ((char *)sa < lim);
             bit <<= 1)
        {
            if ((rtm->rtm_addrs & bit) == 0) {
                continue;
            }
            switch (bit) {
              case RTA_DST:
                sigar_net_address_set(route->destination,
                                      rt_s_addr(sa));
                break;
              case RTA_GATEWAY:
                if (sa->sa_family == AF_INET) {
                    sigar_net_address_set(route->gateway,
                                          rt_s_addr(sa));
                }
                break;
              case RTA_NETMASK:
                sigar_net_address_set(route->mask,
                                      rt_s_addr(sa));
                break;
              case RTA_IFA:
                break;
            }

            sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa));
        }
    }

    free(buf);

    return SIGAR_OK;
}

typedef enum {
    IFMSG_ITER_LIST,
    IFMSG_ITER_GET
} ifmsg_iter_e;

typedef struct {
    const char *name;
    ifmsg_iter_e type;
    union {
        sigar_net_interface_list_t *iflist;
        struct if_msghdr *ifm;
    } data;
} ifmsg_iter_t;

static int sigar_ifmsg_init(sigar_t *sigar)
{
    int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET, NET_RT_IFLIST, 0 };
    size_t len;

    if (sysctl(mib, NMIB(mib), NULL, &len, NULL, 0) < 0) {
        return errno;
    }

    if (sigar->ifconf_len < len) {
        sigar->ifconf_buf = realloc(sigar->ifconf_buf, len);
        sigar->ifconf_len = len;
    }

    if (sysctl(mib, NMIB(mib), sigar->ifconf_buf, &len, NULL, 0) < 0) {
        return errno;
    }

    return SIGAR_OK;
}

static int sigar_ifmsg_iter(sigar_t *sigar, ifmsg_iter_t *iter)
{
    char *end = sigar->ifconf_buf + sigar->ifconf_len;
    char *ptr = sigar->ifconf_buf;

    if (iter->type == IFMSG_ITER_LIST) {
        sigar_net_interface_list_create(iter->data.iflist);
    }

    while (ptr < end) {
        char *name;
        struct sockaddr_dl *sdl;
        struct if_msghdr *ifm = (struct if_msghdr *)ptr;
        
        if (ifm->ifm_type != RTM_IFINFO) {
            break;
        }

        ptr += ifm->ifm_msglen;
        
        while (ptr < end) {
            struct if_msghdr *next = (struct if_msghdr *)ptr;

            if (next->ifm_type != RTM_NEWADDR) {
                break;
            }

            ptr += next->ifm_msglen;
        }

        sdl = (struct sockaddr_dl *)(ifm + 1);
        if (sdl->sdl_family != AF_LINK) {
            continue;
        }
        if (!((sdl->sdl_type == IFT_ETHER) ||
              (sdl->sdl_type == IFT_LOOP)))
        {
            continue; /* XXX deal w/ other weirdo interfaces */
        }

        switch (iter->type) {
          case IFMSG_ITER_LIST:
            SIGAR_NET_IFLIST_GROW(iter->data.iflist);

            name = malloc(sdl->sdl_nlen+1);
            memcpy(name, sdl->sdl_data, sdl->sdl_nlen+1);

            iter->data.iflist->data[iter->data.iflist->number++] = name;
            break;

          case IFMSG_ITER_GET:
            if (strEQ(iter->name, sdl->sdl_data)) {
                iter->data.ifm = ifm;
                return SIGAR_OK;
            }
        }
    }

    switch (iter->type) {
      case IFMSG_ITER_LIST:
        return SIGAR_OK;

      case IFMSG_ITER_GET:
      default:
        return ENXIO;
    }
}

int sigar_net_interface_list_get(sigar_t *sigar,
                                 sigar_net_interface_list_t *iflist)
{
    int status;
    ifmsg_iter_t iter;

    if ((status = sigar_ifmsg_init(sigar)) != SIGAR_OK) {
        return status;
    }

    iter.type = IFMSG_ITER_LIST;
    iter.data.iflist = iflist;

    return sigar_ifmsg_iter(sigar, &iter);
}

int sigar_net_interface_config_get(sigar_t *sigar, const char *name,
                                   sigar_net_interface_config_t *ifconfig)
{
    int sock;
    int status;
    ifmsg_iter_t iter;
    struct if_msghdr *ifm;
    struct sockaddr_dl *sdl;
    struct ifreq ifr;

    if (!name) {
        return sigar_net_interface_config_primary_get(sigar, ifconfig);
    }

    if (sigar->ifconf_len == 0) {
        if ((status = sigar_ifmsg_init(sigar)) != SIGAR_OK) {
            return status;
        }
    }

    SIGAR_ZERO(ifconfig);

    iter.type = IFMSG_ITER_GET;
    iter.name = name;

    if ((status = sigar_ifmsg_iter(sigar, &iter)) != SIGAR_OK) {
        return status;
    }

    if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        return errno;
    }

    ifm = iter.data.ifm;

    SIGAR_SSTRCPY(ifconfig->name, name);

    sdl = (struct sockaddr_dl *)(ifm + 1);

    sigar_net_address_mac_set(ifconfig->hwaddr,
                              LLADDR(sdl),
                              sdl->sdl_alen);

    ifconfig->flags = ifm->ifm_flags;
    ifconfig->mtu = ifm->ifm_data.ifi_mtu;
    ifconfig->metric = ifm->ifm_data.ifi_metric;

    SIGAR_SSTRCPY(ifr.ifr_name, name);

#define ifr_s_addr(ifr) \
    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr

    if (!ioctl(sock, SIOCGIFADDR, &ifr)) {
        sigar_net_address_set(ifconfig->address,
                              ifr_s_addr(ifr));
    }

    if (!ioctl(sock, SIOCGIFNETMASK, &ifr)) {
        sigar_net_address_set(ifconfig->netmask,
                              ifr_s_addr(ifr));
    }

    if (ifconfig->flags & IFF_LOOPBACK) {
        sigar_net_address_set(ifconfig->destination,
                              ifconfig->address.addr.in);
        sigar_net_address_set(ifconfig->broadcast, 0);
        SIGAR_SSTRCPY(ifconfig->type,
                      SIGAR_NIC_LOOPBACK);
    }
    else {
        if (!ioctl(sock, SIOCGIFDSTADDR, &ifr)) {
            sigar_net_address_set(ifconfig->destination,
                                  ifr_s_addr(ifr));
        }

        if (!ioctl(sock, SIOCGIFBRDADDR, &ifr)) {
            sigar_net_address_set(ifconfig->broadcast,
                                  ifr_s_addr(ifr));
        }
        SIGAR_SSTRCPY(ifconfig->type,
                      SIGAR_NIC_ETHERNET);
    }

    close(sock);

    /* XXX can we get a better description like win32? */
    SIGAR_SSTRCPY(ifconfig->description,
                  ifconfig->name);

    return SIGAR_OK;
}

int sigar_net_interface_stat_get(sigar_t *sigar, const char *name,
                                 sigar_net_interface_stat_t *ifstat)
{
    int status;
    ifmsg_iter_t iter;
    struct if_msghdr *ifm;

    if ((status = sigar_ifmsg_init(sigar)) != SIGAR_OK) {
        return status;
    }

    iter.type = IFMSG_ITER_GET;
    iter.name = name;

    if ((status = sigar_ifmsg_iter(sigar, &iter)) != SIGAR_OK) {
        return status;
    }

    ifm = iter.data.ifm;

    ifstat->rx_bytes      = ifm->ifm_data.ifi_ibytes;
    ifstat->rx_packets    = ifm->ifm_data.ifi_ipackets;
    ifstat->rx_errors     = ifm->ifm_data.ifi_ierrors;
    ifstat->rx_dropped    = ifm->ifm_data.ifi_iqdrops;
    ifstat->rx_overruns   = SIGAR_FIELD_NOTIMPL;
    ifstat->rx_frame      = SIGAR_FIELD_NOTIMPL;

    ifstat->tx_bytes      = ifm->ifm_data.ifi_obytes;
    ifstat->tx_packets    = ifm->ifm_data.ifi_opackets;
    ifstat->tx_errors     = ifm->ifm_data.ifi_oerrors;
    ifstat->tx_collisions = ifm->ifm_data.ifi_collisions;
    ifstat->tx_dropped    = SIGAR_FIELD_NOTIMPL;
    ifstat->tx_overruns   = SIGAR_FIELD_NOTIMPL;
    ifstat->tx_carrier    = SIGAR_FIELD_NOTIMPL;

    ifstat->speed         = ifm->ifm_data.ifi_baudrate;

    return SIGAR_OK;
}

#ifndef __OpenBSD__
#include <sys/socketvar.h>
#include <netinet/tcp.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_fsm.h>

static int net_connection_get(sigar_net_connection_walker_t *walker, int proto)
{
    int flags = walker->flags;
    int type, istcp = 0;
    char *buf;
    const char *mibvar;
    struct tcpcb *tp = NULL;
    struct inpcb *inp;
    struct xinpgen *xig, *oxig;
    struct xsocket *so;
    size_t len;

    switch (proto) {
      case IPPROTO_TCP:
        mibvar = "net.inet.tcp.pcblist";
        istcp = 1;
        type = SIGAR_NETCONN_TCP;
        break;
      case IPPROTO_UDP:
        mibvar = "net.inet.udp.pcblist";
        type = SIGAR_NETCONN_UDP;
        break;
      default:
        mibvar = "net.inet.raw.pcblist";
        type = SIGAR_NETCONN_RAW;
        break;
    }

    len = 0;
    if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
        return errno;
    }
    if ((buf = malloc(len)) == 0) {
        return errno;
    }
    if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
        free(buf);
        return errno;
    }

    oxig = xig = (struct xinpgen *)buf;
    for (xig = (struct xinpgen *)((char *)xig + xig->xig_len);
         xig->xig_len > sizeof(struct xinpgen);
         xig = (struct xinpgen *)((char *)xig + xig->xig_len))
    {
        if (istcp) {
            struct xtcpcb *cb = (struct xtcpcb *)xig;
            tp = &cb->xt_tp;
            inp = &cb->xt_inp;
            so = &cb->xt_socket;
        }
        else {
            struct xinpcb *cb = (struct xinpcb *)xig;
            inp = &cb->xi_inp;
            so = &cb->xi_socket;
        }

        if (so->xso_protocol != proto) {
            continue;
        }

        if (inp->inp_gencnt > oxig->xig_gen) {
            continue;
        }

        if ((((flags & SIGAR_NETCONN_SERVER) && so->so_qlimit) ||
            ((flags & SIGAR_NETCONN_CLIENT) && !so->so_qlimit)))
        {
            sigar_net_connection_t conn;

            SIGAR_ZERO(&conn);

            if (inp->inp_vflag & INP_IPV6) {
                sigar_net_address6_set(conn.local_address,
                                       &inp->in6p_laddr.s6_addr);

                sigar_net_address6_set(conn.remote_address,
                                       &inp->in6p_faddr.s6_addr);
            }
            else {
                sigar_net_address_set(conn.local_address,
                                      inp->inp_laddr.s_addr);

                sigar_net_address_set(conn.remote_address,
                                      inp->inp_faddr.s_addr);
            }

            conn.local_port  = ntohs(inp->inp_lport);
            conn.remote_port = ntohs(inp->inp_fport);
            conn.receive_queue = so->so_rcv.sb_cc;
            conn.send_queue    = so->so_snd.sb_cc;
            conn.type = type;

            if (!istcp) {
                conn.state = SIGAR_TCP_UNKNOWN;
                if (walker->add_connection(walker, &conn) != SIGAR_OK) {
                    break;
                }
                continue;
            }

            switch (tp->t_state) {
              case TCPS_CLOSED:
                conn.state = SIGAR_TCP_CLOSE;
                break;
              case TCPS_LISTEN:
                conn.state = SIGAR_TCP_LISTEN;
                break;
              case TCPS_SYN_SENT:
                conn.state = SIGAR_TCP_SYN_SENT;
                break;
              case TCPS_SYN_RECEIVED:
                conn.state = SIGAR_TCP_SYN_RECV;
                break;
              case TCPS_ESTABLISHED:
                conn.state = SIGAR_TCP_ESTABLISHED;
                break;
              case TCPS_CLOSE_WAIT:
                conn.state = SIGAR_TCP_CLOSE_WAIT;
                break;
              case TCPS_FIN_WAIT_1:
                conn.state = SIGAR_TCP_FIN_WAIT1;
                break;
              case TCPS_CLOSING:
                conn.state = SIGAR_TCP_CLOSING;
                break;
              case TCPS_LAST_ACK:
                conn.state = SIGAR_TCP_LAST_ACK;
                break;
              case TCPS_FIN_WAIT_2:
                conn.state = SIGAR_TCP_FIN_WAIT2;
                break;
              case TCPS_TIME_WAIT:
                conn.state = SIGAR_TCP_TIME_WAIT;
                break;
              default:
                conn.state = SIGAR_TCP_UNKNOWN;
                break;
            }

            if (walker->add_connection(walker, &conn) != SIGAR_OK) {
                break;
            }
        }
    }

    free(buf);

    return SIGAR_OK;
}

int sigar_net_connection_walk(sigar_net_connection_walker_t *walker)
{
    int flags = walker->flags;
    int status;

    if (flags & SIGAR_NETCONN_TCP) {
        status = net_connection_get(walker, IPPROTO_TCP);
        if (status != SIGAR_OK) {
            return status;
        }
    }
    if (flags & SIGAR_NETCONN_UDP) {
        status = net_connection_get(walker, IPPROTO_UDP);
        if (status != SIGAR_OK) {
            return status;
        }
    }

    return SIGAR_OK;
}
#else
int sigar_net_connection_walk(sigar_net_connection_walker_t *walker)
{
    return SIGAR_ENOTIMPL;
}
#endif

SIGAR_DECLARE(int)
sigar_tcp_stat_get(sigar_t *sigar,
                   sigar_tcp_stat_t *tcpstat)
{
    struct tcpstat mib;
    int var[4] = { CTL_NET, PF_INET, IPPROTO_TCP, TCPCTL_STATS };
    size_t len = sizeof(mib);

    if (sysctl(var, NMIB(var), &mib, &len, NULL, 0) < 0) {
        return errno;
    }

    tcpstat->max_conn = -1;
    tcpstat->active_opens = mib.tcps_connattempt;
    tcpstat->passive_opens = mib.tcps_accepts;
    tcpstat->attempt_fails = mib.tcps_conndrops;
    tcpstat->estab_resets = mib.tcps_drops;
    if (sigar_tcp_stat_curr_estab(sigar, tcpstat) != SIGAR_OK) {
        tcpstat->curr_estab = -1;
    }
    tcpstat->in_segs = mib.tcps_rcvtotal;
    tcpstat->out_segs = mib.tcps_sndtotal - mib.tcps_sndrexmitpack;
    tcpstat->retrans_segs = mib.tcps_sndrexmitpack;
    tcpstat->out_rsts = mib.tcps_sndctrl - mib.tcps_closed;

    return SIGAR_OK;
}

int sigar_nfs_client_v2_get(sigar_t *sigar,
                            sigar_nfs_client_v2_t *nfsstat)
{
    return SIGAR_ENOTIMPL;
}

int sigar_nfs_server_v2_get(sigar_t *sigar,
                            sigar_nfs_server_v2_t *nfsstat)
{
    return SIGAR_ENOTIMPL;
}

int sigar_nfs_client_v3_get(sigar_t *sigar,
                            sigar_nfs_client_v3_t *nfsstat)
{
    return SIGAR_ENOTIMPL;
}

int sigar_nfs_server_v3_get(sigar_t *sigar,
                            sigar_nfs_server_v3_t *nfsstat)
{
    return SIGAR_ENOTIMPL;
}

#ifdef __FreeBSD__

#define _KERNEL
#include <sys/file.h>
#undef _KERNEL

/* derived from
 * /usr/ports/security/pidentd/work/pidentd-3.0.16/src/k_freebsd2.c
 */
int sigar_proc_port_get(sigar_t *sigar, int protocol,
                        unsigned long port, sigar_pid_t *pid)
{
    struct nlist nl[2];
    struct inpcbhead tcb;
    struct socket *sockp = NULL;
    struct kinfo_proc *pinfo;
    struct inpcb *head, pcbp;
    int i, nentries, status;

    if (protocol != SIGAR_NETCONN_TCP) {
        return SIGAR_ENOTIMPL;
    }

    if (!sigar->kmem) {
        return SIGAR_EPERM_KMEM;
    }

    nl[0].n_name = "_tcb"; /* XXX cache */
    nl[1].n_name = "";
    if (kvm_nlist(sigar->kmem, nl) < 0) {
        return errno;
    }

    status = kread(sigar, &tcb, sizeof(tcb), nl[0].n_value);
    if (status != SIGAR_OK) {
        return status;
    }

    for (head = tcb.lh_first; head != NULL;
         head = pcbp.inp_list.le_next)
    {
        status = kread(sigar, &pcbp, sizeof(pcbp), (long)head);
        if (status != SIGAR_OK) {
            return status;
        }
        if (!(pcbp.inp_vflag & INP_IPV4)) {
            continue;
        }
        if (pcbp.inp_fport != 0) {
            continue;
        }
        if (ntohs(pcbp.inp_lport) == port) {
            sockp = pcbp.inp_socket;
            break;
        }
    }

    if (!sockp) {
        return ENOENT;
    }

    pinfo = kvm_getprocs(sigar->kmem, KERN_PROC_PROC, 0, &nentries);
    if (!pinfo) {
        return errno;
    }

    for (i=0; i<nentries; i++) {
        if (pinfo[i].KI_FLAG & P_SYSTEM) {
            continue;
        }
        if (pinfo[i].KI_FD) {
            struct filedesc pfd;
            struct file **ofiles, ofile;
            int j, osize;

            status = kread(sigar, &pfd, sizeof(pfd), (long)pinfo[i].KI_FD);
            if (status != SIGAR_OK) {
                return status;
            }

            osize = pfd.fd_nfiles * sizeof(struct file *);
            ofiles = malloc(osize); /* XXX reuse */
            if (!ofiles) {
                return errno;
            }

            status = kread(sigar, ofiles, osize, (long)pfd.fd_ofiles);
            if (status != SIGAR_OK) {
                free(ofiles);
                return status;
            }

            for (j=0; j<pfd.fd_nfiles; j++) {
                if (!ofiles[j]) {
                    continue;
                }

                status = kread(sigar, &ofile, sizeof(ofile), (long)ofiles[j]);
                if (status != SIGAR_OK) {
                    free(ofiles);
                    return status;
                }

                if (ofile.f_count == 0) {
                    continue;
                }

                if (ofile.f_type == DTYPE_SOCKET &&
                    (struct socket *)ofile.f_data == sockp)
                {
                    *pid = pinfo[i].KI_PID;
                    free(ofiles);
                    return SIGAR_OK;
                }
            }

            free(ofiles);
        }
    }

    return ENOENT;
}

#else

int sigar_proc_port_get(sigar_t *sigar, int protocol,
                        unsigned long port, sigar_pid_t *pid)
{
    return SIGAR_ENOTIMPL;
}

#endif

int sigar_os_sys_info_get(sigar_t *sigar,
                          sigar_sys_info_t *sysinfo)
{
#ifdef DARWIN
    char *codename = NULL;
    long version, version_major, version_minor, version_fix;

    SIGAR_SSTRCPY(sysinfo->name, "MacOSX");
    SIGAR_SSTRCPY(sysinfo->vendor_name, "Mac OS X");
    SIGAR_SSTRCPY(sysinfo->vendor, "Apple");

    if (Gestalt(gestaltSystemVersion, &version) == noErr) {
        if (version >= 0x00001040) {
            Gestalt('sys1' /*gestaltSystemVersionMajor*/, &version_major);
            Gestalt('sys2' /*gestaltSystemVersionMinor*/, &version_minor);
            Gestalt('sys3' /*gestaltSystemVersionBugFix*/, &version_fix);
        }
        else {
            version_fix = version & 0xf;
            version >>= 4;
            version_minor = version & 0xf;
            version >>= 4;
            version_major = version - (version >> 4) * 6;
        }
    }
    else {
        return SIGAR_ENOTIMPL;
    }

    snprintf(sysinfo->vendor_version,
             sizeof(sysinfo->vendor_version),
             "%ld.%ld",
             version_major, version_minor);

    snprintf(sysinfo->version,
             sizeof(sysinfo->version),
             "%s.%ld",
             sysinfo->vendor_version, version_fix);

    if (version_major == 10) {
        switch (version_minor) {
          case 2:
            codename = "Jaguar";
            break;
          case 3:
            codename = "Panther";
            break;
          case 4:
            codename = "Tiger";
            break;
          case 5:
            codename = "Leopard";
            break;
          default:
            codename = "Unknown";
            break;
        }
    }
    else {
        return SIGAR_ENOTIMPL;
    }

    SIGAR_SSTRCPY(sysinfo->vendor_code_name, codename);

    snprintf(sysinfo->description,
             sizeof(sysinfo->description),
             "%s %s",
             sysinfo->vendor_name, sysinfo->vendor_code_name);
#else
    char *ptr;

#if defined(__FreeBSD__)
    SIGAR_SSTRCPY(sysinfo->name, "FreeBSD");
#elif defined(__OpenBSD__)
    SIGAR_SSTRCPY(sysinfo->name, "OpenBSD");
#else
    SIGAR_SSTRCPY(sysinfo->name, "Unknown");
#endif
    SIGAR_SSTRCPY(sysinfo->vendor_name, sysinfo->name);
    SIGAR_SSTRCPY(sysinfo->vendor, sysinfo->name);
    SIGAR_SSTRCPY(sysinfo->vendor_version,
                  sysinfo->version);

    if ((ptr = strstr(sysinfo->vendor_version, "-"))) {
        /* STABLE, RELEASE, CURRENT */
        *ptr++ = '\0';
        SIGAR_SSTRCPY(sysinfo->vendor_code_name, ptr);
    }

    snprintf(sysinfo->description,
             sizeof(sysinfo->description),
             "%s %s",
             sysinfo->name, sysinfo->version);
#endif

    return SIGAR_OK;
}