pagedmov
f8e02d31cd
- Added disown builtin - Fixed job table not hanging up child processes on exit - Added target architecture and os to --version output - Added local builtin for creating variables scoped to functions
800 lines
20 KiB
Rust
800 lines
20 KiB
Rust
use crate::{
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libsh::{
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error::ShResult,
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term::{Style, Styled},
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},
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prelude::*,
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procio::{IoMode, borrow_fd},
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signal::{disable_reaping, enable_reaping},
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state::{self, read_jobs, set_status, write_jobs},
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};
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pub const SIG_EXIT_OFFSET: i32 = 128;
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bitflags! {
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#[derive(Debug, Copy, Clone)]
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pub struct JobCmdFlags: u8 {
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const LONG = 0b0000_0001; // 0x01
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const PIDS = 0b0000_0010; // 0x02
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const NEW_ONLY = 0b0000_0100; // 0x04
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const RUNNING = 0b0000_1000; // 0x08
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const STOPPED = 0b0001_0000; // 0x10
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const INIT = 0b0010_0000; // 0x20
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}
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}
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#[derive(Debug)]
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pub struct DisplayWaitStatus(pub WtStat);
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impl fmt::Display for DisplayWaitStatus {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match &self.0 {
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WtStat::Exited(_, code) => match code {
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0 => write!(f, "done"),
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_ => write!(f, "failed: {}", code),
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},
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WtStat::Signaled(_, signal, _) => {
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write!(f, "signaled: {:?}", signal)
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}
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WtStat::Stopped(_, signal) => {
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write!(f, "stopped: {:?}", signal)
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}
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WtStat::PtraceEvent(_, signal, _) => {
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write!(f, "ptrace event: {:?}", signal)
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}
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WtStat::PtraceSyscall(_) => {
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write!(f, "ptrace syscall")
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}
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WtStat::Continued(_) => {
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write!(f, "continued")
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}
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WtStat::StillAlive => {
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write!(f, "running")
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}
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}
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}
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}
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#[derive(Clone, Debug)]
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pub enum JobID {
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Pgid(Pid),
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Pid(Pid),
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TableID(usize),
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Command(String),
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}
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#[derive(Debug, Clone)]
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pub struct ChildProc {
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pgid: Pid,
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pid: Pid,
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command: Option<String>,
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stat: WtStat,
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}
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impl ChildProc {
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pub fn new(pid: Pid, command: Option<&str>, pgid: Option<Pid>) -> ShResult<Self> {
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let command = command.map(|str| str.to_string());
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let stat = if kill(pid, None).is_ok() {
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WtStat::StillAlive
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} else {
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WtStat::Exited(pid, 0)
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};
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let mut child = Self {
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pgid: pid,
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pid,
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command,
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stat,
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};
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if let Some(pgid) = pgid {
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child.set_pgid(pgid).ok();
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}
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Ok(child)
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}
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pub fn pid(&self) -> Pid {
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self.pid
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}
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pub fn pgid(&self) -> Pid {
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self.pgid
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}
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pub fn cmd(&self) -> Option<&str> {
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self.command.as_deref()
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}
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pub fn stat(&self) -> WtStat {
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self.stat
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}
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pub fn wait(&mut self, flags: Option<WtFlag>) -> Result<WtStat, Errno> {
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let result = waitpid(self.pid, flags);
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if let Ok(stat) = result {
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self.stat = stat
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}
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result
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}
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pub fn kill<T: Into<Option<Signal>>>(&self, sig: T) -> ShResult<()> {
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Ok(kill(self.pid, sig)?)
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}
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pub fn set_pgid(&mut self, pgid: Pid) -> ShResult<()> {
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setpgid(self.pid, pgid)?;
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self.pgid = pgid;
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Ok(())
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}
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pub fn set_stat(&mut self, stat: WtStat) {
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self.stat = stat
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}
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pub fn is_alive(&self) -> bool {
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self.stat == WtStat::StillAlive
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}
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pub fn is_stopped(&self) -> bool {
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matches!(self.stat, WtStat::Stopped(..))
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}
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pub fn exited(&self) -> bool {
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matches!(self.stat, WtStat::Exited(..))
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}
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}
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#[derive(Clone, Debug)]
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pub struct RegisteredFd {
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pub fd: IoMode,
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pub owner_pid: Pid,
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}
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#[derive(Default, Debug)]
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pub struct JobTab {
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fg: Option<Job>,
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order: Vec<usize>,
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new_updates: Vec<usize>,
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jobs: Vec<Option<Job>>,
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fd_registry: Vec<RegisteredFd>,
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}
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impl JobTab {
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pub fn new() -> Self {
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Self::default()
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}
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pub fn take_fg(&mut self) -> Option<Job> {
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self.fg.take()
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}
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fn next_open_pos(&self) -> usize {
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if let Some(position) = self.jobs.iter().position(|slot| slot.is_none()) {
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position
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} else {
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self.jobs.len()
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}
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}
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pub fn jobs(&self) -> &Vec<Option<Job>> {
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&self.jobs
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}
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pub fn jobs_mut(&mut self) -> &mut Vec<Option<Job>> {
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&mut self.jobs
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}
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pub fn curr_job(&self) -> Option<usize> {
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// Find the most recent valid job (order can have stale entries)
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for &id in self.order.iter().rev() {
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if self.jobs.get(id).is_some_and(|slot| slot.is_some()) {
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return Some(id);
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}
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}
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None
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}
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pub fn prev_job(&self) -> Option<usize> {
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// Find the second most recent valid job
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let mut found_curr = false;
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for &id in self.order.iter().rev() {
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if self.jobs.get(id).is_some_and(|slot| slot.is_some()) {
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if found_curr {
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return Some(id);
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}
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found_curr = true;
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}
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}
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None
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}
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pub fn close_job_fds(&mut self, pid: Pid) {
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self.fd_registry.retain(|fd| fd.owner_pid != pid)
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}
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pub fn registered_fds(&self) -> &[RegisteredFd] {
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&self.fd_registry
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}
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pub fn register_fd(&mut self, owner_pid: Pid, fd: IoMode) {
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let registered_fd = RegisteredFd { fd, owner_pid };
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self.fd_registry.push(registered_fd)
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}
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/// Close all registered proc sub fds. Called after fork in exec_cmd
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/// so the parent doesn't hold pipe ends that prevent EOF.
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pub fn drain_registered_fds(&mut self) {
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self.fd_registry.clear();
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}
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fn prune_jobs(&mut self) {
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while let Some(job) = self.jobs.last() {
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if job.is_none() {
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self.jobs.pop();
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} else {
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break;
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}
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}
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}
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pub fn insert_job(&mut self, mut job: Job, silent: bool) -> ShResult<usize> {
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self.prune_jobs();
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let tab_pos = if let Some(id) = job.tabid() {
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id
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} else {
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self.next_open_pos()
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};
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job.set_tabid(tab_pos);
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self.order.push(tab_pos);
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if !silent {
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write(
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borrow_fd(1),
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job.display(&self.order, JobCmdFlags::INIT).as_bytes(),
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)?;
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}
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if tab_pos == self.jobs.len() {
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self.jobs.push(Some(job))
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} else {
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self.jobs[tab_pos] = Some(job);
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}
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Ok(tab_pos)
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}
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pub fn order(&self) -> &[usize] {
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&self.order
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}
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pub fn query(&self, identifier: JobID) -> Option<&Job> {
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match identifier {
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// Match by process group ID
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JobID::Pgid(pgid) => self
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.jobs
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.iter()
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.find_map(|job| job.as_ref().filter(|j| j.pgid() == pgid)),
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// Match by process ID
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JobID::Pid(pid) => self.jobs.iter().find_map(|job| {
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job
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.as_ref()
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.filter(|j| j.children().iter().any(|child| child.pid() == pid))
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}),
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// Match by table ID (index in the job table)
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JobID::TableID(id) => self.jobs.get(id).and_then(|job| job.as_ref()),
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// Match by command name (partial match)
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JobID::Command(cmd) => self.jobs.iter().find_map(|job| {
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job.as_ref().filter(|j| {
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j.children()
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.iter()
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.any(|child| child.cmd().as_ref().is_some_and(|c| c.contains(&cmd)))
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})
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}),
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}
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}
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pub fn query_mut(&mut self, identifier: JobID) -> Option<&mut Job> {
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match identifier {
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// Match by process group ID
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JobID::Pgid(pgid) => self
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.jobs
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.iter_mut()
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.find_map(|job| job.as_mut().filter(|j| j.pgid() == pgid)),
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// Match by process ID
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JobID::Pid(pid) => self.jobs.iter_mut().find_map(|job| {
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job
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.as_mut()
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.filter(|j| j.children().iter().any(|child| child.pid() == pid))
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}),
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// Match by table ID (index in the job table)
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JobID::TableID(id) => self.jobs.get_mut(id).and_then(|job| job.as_mut()),
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// Match by command name (partial match)
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JobID::Command(cmd) => self.jobs.iter_mut().find_map(|job| {
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job.as_mut().filter(|j| {
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j.children()
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.iter()
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.any(|child| child.cmd().as_ref().is_some_and(|c| c.contains(&cmd)))
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})
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}),
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}
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}
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pub fn get_fg(&self) -> Option<&Job> {
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self.fg.as_ref()
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}
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pub fn get_fg_mut(&mut self) -> Option<&mut Job> {
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self.fg.as_mut()
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}
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pub fn new_fg(&mut self, job: Job) -> ShResult<Vec<WtStat>> {
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let pgid = job.pgid();
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self.fg = Some(job);
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attach_tty(pgid)?;
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let statuses = self.fg.as_mut().unwrap().wait_pgrp()?;
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attach_tty(getpgrp())?;
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Ok(statuses)
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}
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pub fn fg_to_bg(&mut self, stat: WtStat) -> ShResult<()> {
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if self.fg.is_none() {
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return Ok(());
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}
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take_term()?;
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let fg = std::mem::take(&mut self.fg);
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if let Some(mut job) = fg {
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job.set_stats(stat);
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self.insert_job(job, false)?;
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}
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Ok(())
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}
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pub fn bg_to_fg(&mut self, id: JobID) -> ShResult<()> {
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let job = self.remove_job(id);
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if let Some(job) = job {
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wait_fg(job)?;
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}
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Ok(())
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}
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pub fn remove_job(&mut self, id: JobID) -> Option<Job> {
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let tabid = self.query(id).map(|job| job.tabid().unwrap());
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if let Some(tabid) = tabid {
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self.jobs.get_mut(tabid).and_then(Option::take)
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} else {
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None
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}
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}
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pub fn print_jobs(&mut self, flags: JobCmdFlags) -> ShResult<()> {
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let jobs = if flags.contains(JobCmdFlags::NEW_ONLY) {
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&self
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.jobs
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.iter()
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.filter(|job| {
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job
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.as_ref()
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.is_some_and(|job| self.new_updates.contains(&job.tabid().unwrap()))
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})
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.map(|job| job.as_ref())
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.collect::<Vec<Option<&Job>>>()
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} else {
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&self
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.jobs
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.iter()
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.map(|job| job.as_ref())
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.collect::<Vec<Option<&Job>>>()
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};
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let mut jobs_to_remove = vec![];
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for job in jobs.iter().flatten() {
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// Skip foreground job
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let id = job.tabid().unwrap();
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// Filter jobs based on flags
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if flags.contains(JobCmdFlags::RUNNING)
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&& !matches!(
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job.get_stats().get(id).unwrap(),
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WtStat::StillAlive | WtStat::Continued(_)
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)
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{
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continue;
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}
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if flags.contains(JobCmdFlags::STOPPED)
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&& !matches!(job.get_stats().get(id).unwrap(), WtStat::Stopped(_, _))
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{
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continue;
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}
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// Print the job in the selected format
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write(
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borrow_fd(1),
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format!("{}\n", job.display(&self.order, flags)).as_bytes(),
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)?;
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if job
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.get_stats()
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.iter()
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.all(|stat| matches!(stat, WtStat::Exited(_, _) | WtStat::Signaled(_, _, _)))
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{
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jobs_to_remove.push(JobID::TableID(id));
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}
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}
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for id in jobs_to_remove {
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self.remove_job(id);
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}
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Ok(())
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}
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pub fn hang_up(&mut self) {
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for job in self.jobs_mut().iter_mut().flatten() {
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if job.send_hup {
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job.killpg(Signal::SIGHUP).ok();
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}
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}
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}
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pub fn disown(&mut self, id: JobID, nohup: bool) -> ShResult<()> {
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if let Some(job) = self.query_mut(id.clone()) {
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if nohup {
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job.no_hup();
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} else {
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self.remove_job(id);
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}
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}
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Ok(())
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}
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pub fn disown_all(&mut self, nohup: bool) -> ShResult<()> {
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let mut ids_to_remove = vec![];
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for job in self.jobs_mut().iter_mut().flatten() {
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if nohup {
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job.no_hup();
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} else {
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ids_to_remove.push(JobID::TableID(job.tabid().unwrap()));
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}
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}
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for id in ids_to_remove {
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self.remove_job(id);
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}
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Ok(())
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}
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}
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#[derive(Debug)]
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pub struct JobBldr {
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table_id: Option<usize>,
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pgid: Option<Pid>,
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children: Vec<ChildProc>,
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send_hup: bool,
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}
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impl Default for JobBldr {
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fn default() -> Self {
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Self::new()
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}
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}
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impl JobBldr {
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pub fn new() -> Self {
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Self {
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table_id: None,
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pgid: None,
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children: vec![],
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send_hup: true,
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}
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}
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pub fn with_id(self, id: usize) -> Self {
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Self {
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table_id: Some(id),
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pgid: self.pgid,
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children: self.children,
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send_hup: self.send_hup,
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}
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}
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pub fn with_pgid(self, pgid: Pid) -> Self {
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Self {
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table_id: self.table_id,
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pgid: Some(pgid),
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children: self.children,
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send_hup: self.send_hup,
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}
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}
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pub fn set_pgid(&mut self, pgid: Pid) {
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self.pgid = Some(pgid);
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}
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pub fn pgid(&self) -> Option<Pid> {
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self.pgid
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}
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pub fn no_hup(mut self) -> Self {
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self.send_hup = false;
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self
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}
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pub fn with_children(self, children: Vec<ChildProc>) -> Self {
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Self {
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table_id: self.table_id,
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pgid: self.pgid,
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children,
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send_hup: self.send_hup,
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}
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}
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pub fn push_child(&mut self, child: ChildProc) {
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self.children.push(child);
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}
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pub fn build(self) -> Job {
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Job {
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table_id: self.table_id,
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pgid: self.pgid.unwrap_or(Pid::from_raw(0)),
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children: self.children,
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send_hup: self.send_hup,
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}
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}
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}
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/// A wrapper around Vec<JobBldr> with some job-specific methods
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#[derive(Default, Debug)]
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pub struct JobStack(Vec<JobBldr>);
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impl JobStack {
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pub fn new() -> Self {
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Self::default()
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}
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pub fn new_job(&mut self) {
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self.0.push(JobBldr::new())
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}
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pub fn curr_job_mut(&mut self) -> Option<&mut JobBldr> {
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self.0.last_mut()
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}
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pub fn finalize_job(&mut self) -> Option<Job> {
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self.0.pop().map(|bldr| bldr.build())
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}
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}
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#[derive(Debug, Clone)]
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pub struct Job {
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table_id: Option<usize>,
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pgid: Pid,
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children: Vec<ChildProc>,
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send_hup: bool,
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}
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|
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impl Job {
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pub fn set_tabid(&mut self, id: usize) {
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self.table_id = Some(id)
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}
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pub fn no_hup(&mut self) {
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self.send_hup = false;
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}
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pub fn running(&self) -> bool {
|
|
!self.children.iter().all(|chld| chld.exited())
|
|
}
|
|
pub fn tabid(&self) -> Option<usize> {
|
|
self.table_id
|
|
}
|
|
pub fn pgid(&self) -> Pid {
|
|
self.pgid
|
|
}
|
|
pub fn get_cmds(&self) -> Vec<&str> {
|
|
let mut cmds = vec![];
|
|
for child in &self.children {
|
|
cmds.push(child.cmd().unwrap_or_default())
|
|
}
|
|
cmds
|
|
}
|
|
pub fn set_stats(&mut self, stat: WtStat) {
|
|
for child in self.children.iter_mut() {
|
|
child.set_stat(stat);
|
|
}
|
|
}
|
|
pub fn get_stats(&self) -> Vec<WtStat> {
|
|
self
|
|
.children
|
|
.iter()
|
|
.map(|chld| chld.stat())
|
|
.collect::<Vec<WtStat>>()
|
|
}
|
|
pub fn get_pids(&self) -> Vec<Pid> {
|
|
self
|
|
.children
|
|
.iter()
|
|
.map(|chld| chld.pid())
|
|
.collect::<Vec<Pid>>()
|
|
}
|
|
pub fn children(&self) -> &[ChildProc] {
|
|
&self.children
|
|
}
|
|
pub fn children_mut(&mut self) -> &mut Vec<ChildProc> {
|
|
&mut self.children
|
|
}
|
|
pub fn killpg(&mut self, sig: Signal) -> ShResult<()> {
|
|
let stat = match sig {
|
|
Signal::SIGTSTP => WtStat::Stopped(self.pgid, Signal::SIGTSTP),
|
|
Signal::SIGCONT => WtStat::Continued(self.pgid),
|
|
sig => WtStat::Signaled(self.pgid, sig, false),
|
|
};
|
|
self.set_stats(stat);
|
|
Ok(killpg(self.pgid, sig)?)
|
|
}
|
|
pub fn wait_pgrp(&mut self) -> ShResult<Vec<WtStat>> {
|
|
let mut stats = vec![];
|
|
for child in self.children.iter_mut() {
|
|
if child.pid == Pid::this() {
|
|
// TODO: figure out some way to get the exit code of builtins
|
|
let code = state::get_status();
|
|
stats.push(WtStat::Exited(child.pid, code));
|
|
continue;
|
|
}
|
|
loop {
|
|
let result = child.wait(Some(WtFlag::WSTOPPED));
|
|
match result {
|
|
Ok(stat) => {
|
|
stats.push(stat);
|
|
break;
|
|
}
|
|
Err(Errno::ECHILD) => break,
|
|
Err(Errno::EINTR) => continue, // Retry on signal interruption
|
|
Err(e) => return Err(e.into()),
|
|
}
|
|
}
|
|
}
|
|
Ok(stats)
|
|
}
|
|
pub fn update_by_id(&mut self, id: JobID, stat: WtStat) -> ShResult<()> {
|
|
match id {
|
|
JobID::Pid(pid) => {
|
|
let query_result = self.children.iter_mut().find(|chld| chld.pid == pid);
|
|
if let Some(child) = query_result {
|
|
child.set_stat(stat);
|
|
}
|
|
}
|
|
JobID::Command(cmd) => {
|
|
let query_result = self
|
|
.children
|
|
.iter_mut()
|
|
.find(|chld| chld.cmd().is_some_and(|chld_cmd| chld_cmd.contains(&cmd)));
|
|
if let Some(child) = query_result {
|
|
child.set_stat(stat);
|
|
}
|
|
}
|
|
JobID::TableID(tid) => {
|
|
if self.table_id.is_some_and(|tblid| tblid == tid) {
|
|
for child in self.children.iter_mut() {
|
|
child.set_stat(stat);
|
|
}
|
|
}
|
|
}
|
|
JobID::Pgid(pgid) => {
|
|
if pgid == self.pgid {
|
|
for child in self.children.iter_mut() {
|
|
child.set_stat(stat);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
pub fn display(&self, job_order: &[usize], flags: JobCmdFlags) -> String {
|
|
let long = flags.contains(JobCmdFlags::LONG);
|
|
let init = flags.contains(JobCmdFlags::INIT);
|
|
let pids = flags.contains(JobCmdFlags::PIDS);
|
|
|
|
let current = job_order.last();
|
|
let prev = if job_order.len() > 2 {
|
|
job_order.get(job_order.len() - 2)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
let id = self.table_id.unwrap();
|
|
let symbol = if current == self.table_id.as_ref() {
|
|
"+"
|
|
} else if prev == self.table_id.as_ref() {
|
|
"-"
|
|
} else {
|
|
" "
|
|
};
|
|
let padding_count = symbol.len() + id.to_string().len() + 3;
|
|
let padding = " ".repeat(padding_count);
|
|
|
|
let mut output = format!("[{}]{}\t", id + 1, symbol);
|
|
for (i, cmd) in self.get_cmds().iter().enumerate() {
|
|
let pid = if pids || init {
|
|
let mut pid = self.get_pids().get(i).unwrap().to_string();
|
|
pid.push(' ');
|
|
pid
|
|
} else {
|
|
"".to_string()
|
|
};
|
|
let job_stat = *self.get_stats().get(i).unwrap();
|
|
let fmt_stat = DisplayWaitStatus(job_stat).to_string();
|
|
|
|
let mut stat_line = fmt_stat.clone();
|
|
stat_line = format!("{}{} ", pid, stat_line);
|
|
stat_line = format!("{} {}", stat_line, cmd);
|
|
stat_line = match job_stat {
|
|
WtStat::Stopped(..) | WtStat::Signaled(..) => stat_line.styled(Style::Magenta),
|
|
WtStat::Exited(_, code) => match code {
|
|
0 => stat_line.styled(Style::Green),
|
|
_ => stat_line.styled(Style::Red),
|
|
},
|
|
_ => stat_line.styled(Style::Cyan),
|
|
};
|
|
if i != self.get_cmds().len() - 1 {
|
|
stat_line = format!("{} |", stat_line);
|
|
}
|
|
|
|
let stat_final = if long {
|
|
format!(
|
|
"{}{} {}",
|
|
if i != 0 { &padding } else { "" },
|
|
self.get_pids().get(i).unwrap(),
|
|
stat_line
|
|
)
|
|
} else {
|
|
format!("{}{}", if i != 0 { &padding } else { "" }, stat_line)
|
|
};
|
|
output.push_str(&stat_final);
|
|
output.push('\n');
|
|
}
|
|
output
|
|
}
|
|
}
|
|
|
|
pub fn term_ctlr() -> Pid {
|
|
tcgetpgrp(borrow_fd(0)).unwrap_or(getpgrp())
|
|
}
|
|
|
|
/// Calls attach_tty() on the shell's process group to retake control of the
|
|
/// terminal
|
|
pub fn take_term() -> ShResult<()> {
|
|
attach_tty(getpgrp())?;
|
|
Ok(())
|
|
}
|
|
|
|
/// Waits on the current foreground job and updates the shell's last status code
|
|
pub fn wait_fg(job: Job) -> ShResult<()> {
|
|
if job.children().is_empty() {
|
|
return Ok(()); // Nothing to do
|
|
}
|
|
let mut code = 0;
|
|
let mut was_stopped = false;
|
|
attach_tty(job.pgid())?;
|
|
disable_reaping();
|
|
let statuses = write_jobs(|j| j.new_fg(job))?;
|
|
for status in statuses {
|
|
match status {
|
|
WtStat::Exited(_, exit_code) => {
|
|
code = exit_code;
|
|
}
|
|
WtStat::Stopped(_, sig) => {
|
|
was_stopped = true;
|
|
write_jobs(|j| j.fg_to_bg(status))?;
|
|
code = SIG_EXIT_OFFSET + sig as i32;
|
|
}
|
|
WtStat::Signaled(_, sig, _) => {
|
|
if sig == Signal::SIGTSTP {
|
|
was_stopped = true;
|
|
write_jobs(|j| j.fg_to_bg(status))?;
|
|
}
|
|
code = SIG_EXIT_OFFSET + sig as i32;
|
|
}
|
|
_ => { /* Do nothing */ }
|
|
}
|
|
}
|
|
// If job wasn't stopped (moved to bg), clear the fg slot
|
|
if !was_stopped {
|
|
write_jobs(|j| {
|
|
j.take_fg();
|
|
});
|
|
}
|
|
take_term()?;
|
|
set_status(code);
|
|
enable_reaping();
|
|
Ok(())
|
|
}
|
|
|
|
pub fn dispatch_job(job: Job, is_bg: bool) -> ShResult<()> {
|
|
if is_bg {
|
|
write_jobs(|j| j.insert_job(job, false))?;
|
|
} else {
|
|
wait_fg(job)?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn attach_tty(pgid: Pid) -> ShResult<()> {
|
|
// If we aren't attached to a terminal, the pgid already controls it, or the
|
|
// process group does not exist Then return ok
|
|
if !isatty(0).unwrap_or(false) || pgid == term_ctlr() || killpg(pgid, None).is_err() {
|
|
return Ok(());
|
|
}
|
|
|
|
if pgid == getpgrp() && term_ctlr() != getpgrp() {
|
|
kill(term_ctlr(), Signal::SIGTTOU).ok();
|
|
}
|
|
|
|
let mut new_mask = SigSet::empty();
|
|
let mut mask_bkup = SigSet::empty();
|
|
|
|
new_mask.add(Signal::SIGTSTP);
|
|
new_mask.add(Signal::SIGTTIN);
|
|
new_mask.add(Signal::SIGTTOU);
|
|
|
|
pthread_sigmask(SigmaskHow::SIG_BLOCK, Some(&new_mask), Some(&mut mask_bkup))?;
|
|
|
|
let result = tcsetpgrp(borrow_fd(0), pgid);
|
|
|
|
pthread_sigmask(
|
|
SigmaskHow::SIG_SETMASK,
|
|
Some(&mask_bkup),
|
|
Some(&mut new_mask),
|
|
)?;
|
|
|
|
match result {
|
|
Ok(_) => Ok(()),
|
|
Err(e) => {
|
|
tcsetpgrp(borrow_fd(0), getpgrp())?;
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|