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// linux source:
// fs/proc/array.c >= v2.6.18
// status => https://elixir.bootlin.com/linux/v2.6.18/source/fs/proc/array.c#L296
// status vm => https://elixir.bootlin.com/linux/v2.6.18/source/fs/proc/task_mmu.c#L14
use crate::pidentries::PidStatus;
use crate::util::{find_to_pos, skip_to_pos};
use cfg_iif::cfg_iif;
#[allow(unused_imports)]
use crate::util::find_to_opt;
#[derive(Debug, Default, Clone)]
pub struct PidStatusParser();
impl PidStatusParser {
pub fn parse(&mut self, sl: &[u8]) -> PidStatus {
let mut status = PidStatus::default();
if sl.is_empty() {
return status;
}
//
//
let mut pos1: usize;
let mut pos2: usize = 0;
// Name
cfg_iif!(feature = "has_pidentry_status_name" {
macro_rules! myscan {
(skip, $needle:expr) => {{
pos1 = {
let haystack = &sl[pos2..];
let needle = $needle;
pos2 + $needle.len() + find_to_pos(haystack, needle)
};
pos2 = {
let haystack = &sl[pos1..];
let needle = b"\n";
pos1 + find_to_pos(haystack, needle)
};
}};
($needle:expr) => {{
myscan!(skip, $needle);
let s = &sl[pos1..pos2];
let input = String::from_utf8_lossy(s);
input.into_owned()
}};
}
status.name = myscan!(b"Name:\t");
});
cfg_iif!(feature = "has_pidentry_status_state" {
macro_rules! myscan {
(skip, $needle:expr) => {{
pos1 = {
let haystack = &sl[pos2..];
let needle = $needle;
pos2 + $needle.len() + find_to_pos(haystack, needle)
};
pos2 = {
let haystack = &sl[pos1..];
let needle = b"\n";
pos1 + find_to_pos(haystack, needle)
};
}};
($needle:expr) => {{
myscan!(skip, $needle);
if pos1 < pos2 {
sl[pos1]
} else {
0
}
}};
}
status.state = myscan!(b"State:\t");
});
// Tgid, Ngid, Pid, PPid
{
macro_rules! myscan {
(skip, $needle:expr) => {{
pos1 = {
let haystack = &sl[pos2..];
let needle = $needle;
pos2 + $needle.len() + find_to_pos(haystack, needle)
};
pos2 = {
let haystack = &sl[pos1..];
let needle = b"\n";
pos1 + find_to_pos(haystack, needle)
};
}};
($needle:expr) => {{
myscan!(skip, $needle);
let s = &sl[pos1..pos2];
let input = String::from_utf8_lossy(s);
input.as_ref().parse().unwrap()
}};
}
cfg_iif!(feature = "has_pidentry_status_tgid" {
status.tgid = myscan!(b"Tgid:\t");
});
cfg_iif!(feature = "has_pidentry_status_ngid" {
status.ngid = myscan!(b"Ngid:\t");
});
{
status.pid = myscan!(b"Pid:\t");
status.ppid = myscan!(b"PPid:\t");
}
cfg_iif!(feature = "has_pidentry_status_tracer_pid" {
status.tracer_pid = myscan!(b"TracerPid:\t");
});
let _ = pos2;
}
// Uid, Gid
{
macro_rules! myscan {
($needle:expr) => {{
pos2 = {
let haystack = &sl[pos1..];
let needle = $needle;
pos1 + find_to_pos(haystack, needle)
};
let s = &sl[pos1..pos2];
pos1 = pos2 + 1;
let input = String::from_utf8_lossy(s);
input.as_ref().parse().unwrap()
}};
}
pos1 = {
let haystack = &sl[pos1..];
let needle = b"Uid:\t";
pos1 + needle.len() + find_to_pos(haystack, needle)
};
status.ruid = myscan!(b"\t");
status.euid = myscan!(b"\t");
status.suid = myscan!(b"\t");
status.fuid = myscan!(b"\n");
//
pos1 = {
let haystack = &sl[pos1..];
let needle = b"Gid:\t";
pos1 + needle.len() + find_to_pos(haystack, needle)
};
status.rgid = myscan!(b"\t");
status.egid = myscan!(b"\t");
status.sgid = myscan!(b"\t");
status.fgid = myscan!(b"\n");
}
// VmPeak, VmSize, VmLck, ...
{
macro_rules! myscan {
(check, $needle:expr) => {{
{
let haystack = &sl[pos1..];
let needle = $needle;
match find_to_opt(haystack, needle) {
Some(_pos) => true,
None => false,
}
}
}};
(skip_spaces) => {{
pos1 += skip_to_pos(&sl[pos1..], b' ');
}};
(skip, $needle:expr) => {{
pos2 = {
let haystack = &sl[pos1..];
let needle = $needle;
pos1 + find_to_pos(haystack, needle)
};
let s = &sl[pos1..pos2];
pos1 = pos2 + 1;
s
}};
($needle:expr) => {{
let s = myscan!(skip, $needle);
let input = String::from_utf8_lossy(s);
input.as_ref().parse().unwrap()
}};
}
macro_rules! myscan_field {
($target:tt <= $needle:tt) => {{
let haystack = &sl[pos1..];
let needle = $needle;
pos1 = pos1 + needle.len() + find_to_pos(haystack, needle);
myscan!(skip_spaces);
status.$target = myscan!(b" ");
}};
($target:tt <= ? $needle:tt) => {{
let haystack = &sl[pos1..];
let needle = $needle;
if myscan!(check, needle) {
pos1 = pos1 + needle.len() + find_to_pos(haystack, needle);
myscan!(skip_spaces);
status.$target = myscan!(b" ");
}
}};
}
//
// content of vm
// VmPeak:\t 17276 kB
// VmSize:\t 17276 kB
// on linux:
// "VmPeak:\t%8lu kB\n" ...
// "VmSize:\t%8lu kB\n"
//
if !myscan!(check, b"VmPeak:\t") {
// some kernel thread do not has Vm, but no error.
return status;
}
cfg_iif!(feature = "has_pidentry_status_vm_peak" {
myscan_field!(vm_peak <= b"VmPeak:\t");
});
//
myscan_field!(vm_size <= b"VmSize:\t");
myscan_field!(vm_lck <= b"VmLck:\t");
//
cfg_iif!(feature = "has_pidentry_status_vm_pin" {
myscan_field!(vm_pin <=? b"VmPin:\t");
});
cfg_iif!(feature = "has_pidentry_status_vm_hwm" {
myscan_field!(vm_hwm <= b"VmHWM:\t");
});
//
myscan_field!(vm_rss <= b"VmRSS:\t");
//
cfg_iif!(feature = "has_pidentry_status_rss_anon" {
myscan_field!(rss_anon <=? b"RssAnon:\t");
});
cfg_iif!(feature = "has_pidentry_status_rss_file" {
myscan_field!(rss_file <=? b"RssFile:\t");
});
cfg_iif!(feature = "has_pidentry_status_rss_shmem" {
myscan_field!(rss_shmem <=? b"RssShmem:\t");
});
//
myscan_field!(vm_data <= b"VmData:\t");
myscan_field!(vm_stk <= b"VmStk:\t");
myscan_field!(vm_exe <= b"VmExe:\t");
myscan_field!(vm_lib <= b"VmLib:\t");
myscan_field!(vm_pte <= b"VmPTE:\t");
//
cfg_iif!(feature = "has_pidentry_status_vm_pmd" {
myscan_field!(vm_pmd <=? b"VmPMD:\t");
});
//
myscan_field!(vm_swap <=? b"VmSwap:\t");
let _ = pos1;
}
//
status
}
}