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kstat.rs
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kstat.rs
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#![cfg(any(target_os = "solaris", target_os = "illumos"))]
type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
// There is presently no static CStr constructor, so use these constants with
// the c() wrapper below:
const MODULE_CPU_INFO: &[u8] = b"cpu_info\0";
const STAT_CLOCK_MHZ: &[u8] = b"clock_MHz\0";
const MODULE_UNIX: &[u8] = b"unix\0";
const NAME_SYSTEM_MISC: &[u8] = b"system_misc\0";
const STAT_BOOT_TIME: &[u8] = b"boot_time\0";
const STAT_NPROC: &[u8] = b"nproc\0";
const NAME_SYSTEM_PAGES: &[u8] = b"system_pages\0";
const STAT_FREEMEM: &[u8] = b"freemem\0";
const STAT_PHYSMEM: &[u8] = b"physmem\0";
fn c(buf: &[u8]) -> &std::ffi::CStr {
std::ffi::CStr::from_bytes_with_nul(buf).expect("invalid string constant")
}
mod wrapper {
use std::os::raw::c_int;
use std::os::raw::c_uint;
use std::os::raw::c_char;
use std::os::raw::c_uchar;
use std::os::raw::c_void;
use std::os::raw::c_long;
use std::os::raw::c_ulong;
use std::os::raw::c_longlong;
use std::ptr::{null, null_mut, NonNull};
use std::ffi::CStr;
const KSTAT_TYPE_NAMED: c_uchar = 1;
const KSTAT_STRLEN: usize = 31;
#[repr(C)]
struct Kstat {
ks_crtime: c_longlong,
ks_next: *mut Kstat,
ks_kid: c_uint,
ks_module: [c_char; KSTAT_STRLEN],
ks_resv: c_uchar,
ks_instance: c_int,
ks_name: [c_char; KSTAT_STRLEN],
ks_type: c_uchar,
ks_class: [c_char; KSTAT_STRLEN],
ks_flags: c_uchar,
ks_data: *mut c_void,
ks_ndata: c_uint,
ks_data_size: usize,
ks_snaptime: c_longlong,
}
impl Kstat {
fn name(&self) -> &CStr {
unsafe { CStr::from_ptr(self.ks_name.as_ptr()) }
}
fn module(&self) -> &CStr {
unsafe { CStr::from_ptr(self.ks_module.as_ptr()) }
}
}
#[repr(C)]
struct KstatCtl {
kc_chain_id: c_uint,
kc_chain: *mut Kstat,
kc_kd: c_int,
}
#[repr(C)]
#[derive(Copy, Clone)]
union KstatValue {
c: [c_char; 16],
l: c_long,
ul: c_ulong,
ui32: u32,
}
#[repr(C)]
struct KstatNamed {
name: [c_char; KSTAT_STRLEN],
data_type: c_uchar,
value: KstatValue,
}
extern "C" {
fn kstat_open() -> *mut KstatCtl;
fn kstat_close(kc: *mut KstatCtl) -> c_int;
fn kstat_lookup(kc: *mut KstatCtl, module: *const c_char,
instance: c_int, name: *const c_char) -> *mut Kstat;
fn kstat_read(kc: *mut KstatCtl, ksp: *mut Kstat, buf: *mut c_void)
-> c_int;
fn kstat_data_lookup(ksp: *mut Kstat, name: *const c_char)
-> *mut c_void;
}
/// Minimal wrapper around libkstat(3LIB) on illumos and Solaris systems.
pub struct KstatWrapper {
kc: NonNull<KstatCtl>,
ks: Option<NonNull<Kstat>>,
stepping: bool,
}
/// Turn an optional CStr into a (const char *) for Some, or NULL for None.
fn cp(p: &Option<&CStr>) -> *const c_char {
p.map_or_else(|| null(), |p| p.as_ptr())
}
impl KstatWrapper {
pub fn open() -> super::Result<Self> {
let kc = NonNull::new(unsafe { kstat_open() });
if let Some(kc) = kc {
Ok(KstatWrapper {
kc: kc,
ks: None,
stepping: false,
})
} else {
let e = std::io::Error::last_os_error();
Err(format!("kstat_open(3KSTAT) failed: {}", e).into())
}
}
/// Call kstat_lookup(3KSTAT) and store the result, if there is a match.
pub fn lookup(&mut self, module: Option<&CStr>, name: Option<&CStr>) {
self.ks = NonNull::new(unsafe {
kstat_lookup(self.kc.as_ptr(), cp(&module), -1, cp(&name))
});
self.stepping = false;
}
/// Call once to start iterating, and then repeatedly for each
/// additional kstat in the chain. Returns false once there are no more
/// kstat entries.
pub fn step(&mut self) -> bool {
if !self.stepping {
self.stepping = true;
} else {
self.ks = self.ks.map_or(None,
|ks| NonNull::new(unsafe { ks.as_ref() }.ks_next));
}
if self.ks.is_none() {
self.stepping = false;
false
} else {
true
}
}
/// Return the module name of the current kstat. This routine will
/// panic if step() has not returned true.
pub fn module(&self) -> &CStr {
let ks = self.ks.as_ref().expect("step() must return true first");
unsafe { ks.as_ref() }.module()
}
/// Return the name of the current kstat. This routine will panic if
/// step() has not returned true.
pub fn name(&self) -> &CStr {
let ks = self.ks.as_ref().expect("step() must return true first");
unsafe { ks.as_ref() }.name()
}
/// Look up a named kstat value. For internal use by typed accessors.
fn data_value(&self, statistic: &CStr) -> Option<NonNull<KstatNamed>> {
let (ks, ksp) = if let Some(ks) = &self.ks {
(unsafe { ks.as_ref() }, ks.as_ptr())
} else {
return None;
};
if unsafe { kstat_read(self.kc.as_ptr(), ksp, null_mut()) } == -1 {
return None;
}
if ks.ks_type != KSTAT_TYPE_NAMED || ks.ks_ndata < 1 {
// This is not a named kstat, or it has no data payload.
return None;
}
NonNull::new(unsafe {
kstat_data_lookup(ksp, cp(&Some(statistic)))
}).map(|voidp| voidp.cast())
}
/// Look up a named kstat value and interpret it as a "long_t".
pub fn data_long(&self, statistic: &CStr) -> Option<i64> {
self.data_value(statistic).map(|kn| unsafe {
kn.as_ref().value.l
} as i64)
}
/// Look up a named kstat value and interpret it as a "ulong_t".
pub fn data_ulong(&self, statistic: &CStr) -> Option<u64> {
self.data_value(statistic).map(|kn| unsafe {
kn.as_ref().value.ul
} as u64)
}
/// Look up a named kstat value and interpret it as a "uint32_t".
pub fn data_u32(&self, statistic: &CStr) -> Option<u32> {
self.data_value(statistic).map(|kn| unsafe {
kn.as_ref().value.ui32
})
}
}
impl Drop for KstatWrapper {
fn drop(&mut self) {
unsafe { kstat_close(self.kc.as_ptr()) };
}
}
}
pub fn cpu_mhz() -> Result<u64> {
let mut k = wrapper::KstatWrapper::open()?;
k.lookup(Some(c(MODULE_CPU_INFO)), None);
while k.step() {
if k.module() != c(MODULE_CPU_INFO) {
continue;
}
if let Some(mhz) = k.data_long(c(STAT_CLOCK_MHZ)) {
return Ok(mhz as u64);
}
}
return Err("cpu speed kstat not found".into());
}
pub fn boot_time() -> Result<u64> {
let mut k = wrapper::KstatWrapper::open()?;
k.lookup(Some(c(MODULE_UNIX)), Some(c(NAME_SYSTEM_MISC)));
while k.step() {
if k.module() != c(MODULE_UNIX) || k.name() != c(NAME_SYSTEM_MISC) {
continue;
}
if let Some(boot_time) = k.data_u32(c(STAT_BOOT_TIME)) {
return Ok(boot_time as u64);
}
}
return Err("boot time kstat not found".into());
}
pub fn nproc() -> Result<u64> {
let mut k = wrapper::KstatWrapper::open()?;
k.lookup(Some(c(MODULE_UNIX)), Some(c(NAME_SYSTEM_MISC)));
while k.step() {
if k.module() != c(MODULE_UNIX) || k.name() != c(NAME_SYSTEM_MISC) {
continue;
}
if let Some(nproc) = k.data_u32(c(STAT_NPROC)) {
return Ok(nproc as u64);
}
}
return Err("process count kstat not found".into());
}
pub struct Pages {
pub freemem: u64,
pub physmem: u64,
}
pub fn pages() -> Result<Pages> {
let mut k = wrapper::KstatWrapper::open()?;
k.lookup(Some(c(MODULE_UNIX)), Some(c(NAME_SYSTEM_PAGES)));
while k.step() {
if k.module() != c(MODULE_UNIX) || k.name() != c(NAME_SYSTEM_PAGES) {
continue;
}
let freemem = k.data_ulong(c(STAT_FREEMEM));
let physmem = k.data_ulong(c(STAT_PHYSMEM));
if freemem.is_some() && physmem.is_some() {
return Ok(Pages {
freemem: freemem.unwrap(),
physmem: physmem.unwrap(),
});
}
}
return Err("system pages kstat not available".into());
}