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// Cross-platform process backend used when /proc isn't available (macOS,
// *BSD, Windows). Powered by the `sysinfo` crate, which gives us PID,
// command line, working directory, executable path, RSS, virtual size,
// CPU%, and start time on every supported OS.
//
// Things /proc gives us that sysinfo can't:
//
// - per-process IO (read_bytes / write_bytes)
// - writable-FD enumeration (we surface this as "writing files" on Linux)
// - per-pid clock-tick precision for CPU calculations
//
// On non-Linux we leave those fields zero/empty and rely on session readers
// + CPU% for status. All other behavior — matchers, project derivation,
// session enrichment, sorting, charts — works identically.
use crate::format::derive_project;
use crate::matchers::{classify, Matcher, UserMatcher};
use crate::model::{Agent, Status};
use sysinfo::{MemoryRefreshKind, ProcessRefreshKind, ProcessesToUpdate, RefreshKind, System, UpdateKind};
pub struct SysBackend {
sys: System,
/// Per-tick refresh spec: full process metadata (cpu, mem, cmd,
/// cwd, exe) plus disk-usage IO so we can fill the read_bytes /
/// write_bytes columns on macOS + Windows like the Linux /proc
/// path does.
refresh_kind: ProcessRefreshKind,
}
impl SysBackend {
pub fn new() -> Self {
let refresh_kind = ProcessRefreshKind::nothing()
.with_cpu()
.with_memory()
.with_exe(UpdateKind::OnlyIfNotSet)
.with_cmd(UpdateKind::OnlyIfNotSet)
.with_cwd(UpdateKind::OnlyIfNotSet)
.with_disk_usage()
.with_tasks();
let mut sys = System::new_with_specifics(
RefreshKind::default()
.with_processes(refresh_kind)
.with_memory(MemoryRefreshKind::everything()),
);
sys.refresh_processes_specifics(ProcessesToUpdate::All, true, refresh_kind);
sys.refresh_memory();
Self { sys, refresh_kind }
}
pub fn refresh(&mut self) {
self.sys.refresh_processes_specifics(ProcessesToUpdate::All, true, self.refresh_kind);
self.sys.refresh_memory();
}
/// Total system memory in bytes. 0 if sysinfo couldn't read it.
pub fn total_memory(&self) -> u64 { self.sys.total_memory() }
/// Available (free + reclaimable) memory in bytes. 0 if unknown.
pub fn available_memory(&self) -> u64 { self.sys.available_memory() }
/// Walk every process and return Agents that match a known matcher.
pub fn collect_agents(
&self,
builtins: &[Matcher],
user: &[UserMatcher],
) -> Vec<Agent> {
let mut out = Vec::new();
for (pid, proc) in self.sys.processes() {
let cmdline_parts: Vec<&str> = proc.cmd().iter()
.filter_map(|s| s.to_str()).collect();
let cmdline = cmdline_parts.join(" ");
if cmdline.is_empty() { continue; }
let label = match classify(&cmdline, builtins, user) {
Some(l) => l.to_string(),
None => continue,
};
// Sanitise sysinfo-derived strings the same way the
// Linux backend does — argv[0] / cwd / exe come from
// attacker-influenced sources and could contain ANSI.
let cwd = crate::format::sanitize_control(
&proc.cwd().map(|p| p.to_string_lossy().into_owned()).unwrap_or_default());
let exe = crate::format::sanitize_control(
&proc.exe().map(|p| p.to_string_lossy().into_owned()).unwrap_or_default());
let cmdline = crate::format::sanitize_control(&cmdline);
let project = derive_project(&cwd, &exe, &cmdline, &label);
let cpu = proc.cpu_usage() as f64;
let started_at = proc.start_time(); // unix seconds
let now = std::time::SystemTime::now()
.duration_since(std::time::UNIX_EPOCH).map(|d| d.as_secs()).unwrap_or(0);
let uptime_sec = now.saturating_sub(started_at);
// Native writable-FD enumeration (libproc on macOS,
// NtQuerySystemInformation on Windows, empty on *BSD).
// Computed once per agent, then split into files +
// unique-dirs to mirror the Linux /proc path.
let writing = crate::writing_files::read(pid.as_u32(), 4);
let writing_files: Vec<String> = writing.iter()
.map(|p| crate::format::sanitize_control(&p.to_string_lossy()))
.collect();
let writing_dirs: Vec<String> = {
let mut seen = std::collections::HashSet::new();
writing.iter()
.filter_map(|p| p.parent().map(|d|
crate::format::sanitize_control(&d.to_string_lossy())))
.filter(|d| seen.insert(d.clone()))
.collect()
};
out.push(Agent {
pid: pid.as_u32(),
label,
status: Status::Active,
project,
current_tool: None,
current_task: None,
subagents: 0,
session_id: None,
session_age_ms: None,
tokens_total: 0,
tokens_input: 0,
tokens_output: 0,
tokens_cache_read: 0,
tokens_cache_write: 0,
cost_usd: 0.0,
cost_basis: "unknown".into(),
context_used: 0,
context_limit: 0,
loaded_skills: Vec::new(),
loaded_plugins: Vec::new(),
tool_counts: Vec::new(),
ppid_name: proc.parent()
.and_then(|pp| self.sys.process(pp))
.map(|p| crate::format::sanitize_control(&p.name().to_string_lossy()))
.unwrap_or_default(),
session_started_ms: 0,
dangerous_flag: crate::collector::dangerous_flag_for_cmdline(&cmdline),
model: None,
dangerous: crate::collector::is_dangerous_for_cmdline(&cmdline),
in_flight_subagents: Vec::new(),
recent_activity: Vec::new(),
cpu_history: Vec::new(),
tokens_history: Vec::new(),
cpu,
cpu_raw: cpu,
rss: proc.memory(),
vsize: proc.virtual_memory(),
threads: proc.tasks().map(|t| t.len() as u64).unwrap_or(1),
state: format!("{:?}", proc.status()),
ppid: proc.parent().map(|p| p.as_u32()).unwrap_or(0),
uptime_sec,
cwd,
exe,
cmdline,
// sysinfo exposes per-process disk IO on Linux + macOS +
// Windows (FreeBSD returns 0). `total_*` are
// cumulative since process start, which matches the
// semantics of /proc/<pid>/io that the Linux backend
// returns.
read_bytes: proc.disk_usage().total_read_bytes,
write_bytes: proc.disk_usage().total_written_bytes,
writing_files,
writing_dirs,
// sysinfo doesn't expose per-process FD lists or
// child enumeration on macOS / Windows / *BSD;
// these stay empty. /proc/<pid>/net/tcp is also
// Linux-only.
reading_files: Vec::new(),
children: Vec::new(),
net_established: 0,
read_rate_bps: 0,
write_rate_bps: 0,
gpu_pct: 0.0,
gpu_mem_bytes: 0,
});
}
out
}
pub fn num_cpus(&self) -> usize {
// Fall back to logical core count via std::thread.
std::thread::available_parallelism().map(|n| n.get()).unwrap_or(1)
}
}