mirror of
https://github.com/fish-shell/fish-shell
synced 2024-12-29 06:13:20 +00:00
d30fab372f
As implied by the changelog. Unfortunately it's not obvious how to access the RefCell value in spite of a potential (albeit unlikely) present mutable borrow. We need to use a different type to make it work in such cases, hopefully doing that in future. In future we could even use panic=abort and use this style of cleanup for panics (instead of RAII).
567 lines
20 KiB
Rust
567 lines
20 KiB
Rust
use std::num::NonZeroI32;
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use crate::common::{exit_without_destructors, restore_term_foreground_process_group_for_exit};
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use crate::event::{enqueue_signal, is_signal_observed};
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use crate::input_common::TERMINAL_PROTOCOLS;
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use crate::nix::getpid;
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use crate::reader::{reader_handle_sigint, reader_sighup};
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use crate::termsize::TermsizeContainer;
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use crate::topic_monitor::{generation_t, topic_monitor_principal, topic_t, GenerationsList};
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use crate::wchar::prelude::*;
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use crate::wutil::{fish_wcstoi, perror};
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use errno::{errno, set_errno};
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use std::sync::atomic::{AtomicI32, Ordering};
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/// Store the "main" pid. This allows us to reliably determine if we are in a forked child.
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static MAIN_PID: AtomicI32 = AtomicI32::new(0);
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/// It's possible that we receive a signal after we have forked, but before we have reset the signal
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/// handlers (or even run the pthread_atfork calls). In that event we will do something dumb like
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/// swallow SIGINT. Ensure that doesn't happen. Check if we are the main fish process; if not, reset
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/// and re-raise the signal. \return whether we re-raised the signal.
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fn reraise_if_forked_child(sig: i32) -> bool {
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// Don't use is_forked_child: it relies on atfork handlers which may have not yet run.
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if getpid() == MAIN_PID.load(Ordering::Relaxed) {
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return false;
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}
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// Safety: signal() and raise() are async-signal-safe.
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unsafe {
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libc::signal(sig, libc::SIG_DFL);
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libc::raise(sig);
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}
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true
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}
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/// The cancellation signal we have received.
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/// Of course this is modified from a signal handler.
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static CANCELLATION_SIGNAL: AtomicI32 = AtomicI32::new(0);
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/// Set the cancellation signal to zero.
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/// In generally this should only be done in interactive sessions.
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pub fn signal_clear_cancel() {
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CANCELLATION_SIGNAL.store(0, Ordering::Relaxed);
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}
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/// \return the most recent cancellation signal received by the fish process.
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/// Currently only SIGINT is considered a cancellation signal.
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/// This is thread safe.
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pub fn signal_check_cancel() -> i32 {
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CANCELLATION_SIGNAL.load(Ordering::Relaxed)
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}
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/// The single signal handler. By centralizing signal handling we ensure that we can never install
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/// the "wrong" signal handler (see #5969).
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extern "C" fn fish_signal_handler(
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sig: i32,
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_info: *mut libc::siginfo_t,
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_context: *mut libc::c_void,
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) {
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// Ensure we preserve errno.
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let saved_errno = errno();
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// Check if we are a forked child.
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if reraise_if_forked_child(sig) {
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set_errno(saved_errno);
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return;
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}
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// Check if fish script cares about this.
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let observed = is_signal_observed(sig);
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if observed {
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enqueue_signal(sig);
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}
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// Do some signal-specific stuff.
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match sig {
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libc::SIGWINCH => {
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// Respond to a winch signal by telling the termsize container.
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TermsizeContainer::handle_winch();
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}
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libc::SIGHUP => {
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// Exit unless the signal was trapped.
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if !observed {
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reader_sighup();
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}
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topic_monitor_principal().post(topic_t::sighupint);
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}
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libc::SIGTERM => {
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// Handle sigterm. The only thing we do is restore the front process ID, then die.
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if !observed {
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restore_term_foreground_process_group_for_exit();
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if let Ok(mut term_protocols) = TERMINAL_PROTOCOLS.get().try_borrow_mut() {
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*term_protocols = None;
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}
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// Safety: signal() and raise() are async-signal-safe.
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unsafe {
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libc::signal(libc::SIGTERM, libc::SIG_DFL);
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libc::raise(libc::SIGTERM);
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}
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}
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}
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libc::SIGINT => {
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// Cancel unless the signal was trapped.
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if !observed {
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CANCELLATION_SIGNAL.store(libc::SIGINT, Ordering::Relaxed);
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}
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reader_handle_sigint();
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topic_monitor_principal().post(topic_t::sighupint);
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}
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libc::SIGCHLD => {
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// A child process stopped or exited.
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topic_monitor_principal().post(topic_t::sigchld);
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}
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libc::SIGALRM => {
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// We have a sigalarm handler that does nothing. This is used in the signal torture
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// test, to verify that we behave correctly when receiving lots of irrelevant signals.
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}
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_ => {}
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}
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set_errno(saved_errno);
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}
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/// Set all signal handlers to SIG_DFL.
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/// This is called after fork - it should be async signal safe.
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pub fn signal_reset_handlers() {
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let mut act: libc::sigaction = unsafe { std::mem::zeroed() };
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unsafe { libc::sigemptyset(&mut act.sa_mask) };
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act.sa_flags = 0;
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act.sa_sigaction = libc::SIG_DFL;
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for data in SIGNAL_TABLE.iter() {
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if data.signal == libc::SIGHUP {
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let mut oact: libc::sigaction = unsafe { std::mem::zeroed() };
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unsafe { libc::sigaction(libc::SIGHUP, std::ptr::null(), &mut oact) };
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if oact.sa_sigaction == libc::SIG_IGN {
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continue;
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}
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}
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unsafe {
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libc::sigaction(data.signal.code(), &act, std::ptr::null_mut());
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};
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}
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}
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// Wrapper around sigaction.
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fn sigaction(sig: i32, act: &libc::sigaction, oact: *mut libc::sigaction) -> libc::c_int {
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// Note: historically many call sites have ignored return value of sigaction here.
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unsafe { libc::sigaction(sig, act, oact) }
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}
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fn set_interactive_handlers() {
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let signal_handler: usize = fish_signal_handler as usize;
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let mut act: libc::sigaction = unsafe { std::mem::zeroed() };
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let mut oact: libc::sigaction = unsafe { std::mem::zeroed() };
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act.sa_flags = 0;
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oact.sa_flags = 0;
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unsafe { libc::sigemptyset(&mut act.sa_mask) };
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let nullptr = std::ptr::null_mut();
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// Interactive mode. Ignore interactive signals. We are a shell, we know what is best for
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// the user.
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act.sa_sigaction = libc::SIG_IGN;
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sigaction(libc::SIGTSTP, &act, nullptr);
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sigaction(libc::SIGTTOU, &act, nullptr);
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// We don't ignore SIGTTIN because we might send it to ourself.
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act.sa_sigaction = signal_handler;
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act.sa_flags = libc::SA_SIGINFO;
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sigaction(libc::SIGTTIN, &act, nullptr);
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// SIGTERM restores the terminal controlling process before dying.
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act.sa_sigaction = signal_handler;
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act.sa_flags = libc::SA_SIGINFO;
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sigaction(libc::SIGTERM, &act, nullptr);
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unsafe { libc::sigaction(libc::SIGHUP, nullptr, &mut oact) };
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if oact.sa_sigaction == libc::SIG_DFL {
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act.sa_sigaction = signal_handler;
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act.sa_flags = libc::SA_SIGINFO;
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sigaction(libc::SIGHUP, &act, nullptr);
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}
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// SIGALARM as part of our signal torture test
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act.sa_sigaction = signal_handler;
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act.sa_flags = libc::SA_SIGINFO;
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sigaction(libc::SIGALRM, &act, nullptr);
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act.sa_sigaction = signal_handler;
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act.sa_flags = libc::SA_SIGINFO;
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sigaction(libc::SIGWINCH, &act, nullptr);
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}
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/// Set signal handlers to fish default handlers.
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pub fn signal_set_handlers(interactive: bool) {
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// Mark our main pid.
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MAIN_PID.store(getpid(), Ordering::Relaxed);
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use libc::SIG_IGN;
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let nullptr = std::ptr::null_mut();
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let mut act: libc::sigaction = unsafe { std::mem::zeroed() };
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act.sa_flags = 0;
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unsafe { libc::sigemptyset(&mut act.sa_mask) };
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// Ignore SIGPIPE. We'll detect failed writes and deal with them appropriately. We don't want
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// this signal interrupting other syscalls or terminating us.
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act.sa_sigaction = SIG_IGN;
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sigaction(libc::SIGPIPE, &act, nullptr);
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// Ignore SIGQUIT.
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act.sa_sigaction = SIG_IGN;
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sigaction(libc::SIGQUIT, &act, nullptr);
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// Apply our SIGINT handler.
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act.sa_sigaction = fish_signal_handler as usize;
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act.sa_flags = libc::SA_SIGINFO;
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sigaction(libc::SIGINT, &act, nullptr);
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// Whether or not we're interactive we want SIGCHLD to not interrupt restartable syscalls.
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act.sa_sigaction = fish_signal_handler as usize;
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act.sa_flags = libc::SA_SIGINFO | libc::SA_RESTART;
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if sigaction(libc::SIGCHLD, &act, nullptr) != 0 {
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perror("sigaction");
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exit_without_destructors(1);
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}
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if interactive {
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set_interactive_handlers();
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}
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if cfg!(feature = "FISH_TSAN_WORKAROUNDS") {
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// Work around the following TSAN bug:
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// The structure containing signal information for a thread is lazily allocated by TSAN.
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// It is possible for the same thread to receive two allocations, if the signal handler
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// races with other allocation paths (e.g. a blocking call). This results in the first signal
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// being potentially dropped.
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// The workaround is to send ourselves a SIGCHLD signal now, to force the allocation to happen.
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// As no child is associated with this signal, it is OK if it is dropped, so long as the
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// allocation happens.
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unsafe { libc::kill(getpid(), libc::SIGCHLD) };
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}
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}
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pub fn signal_set_handlers_once(interactive: bool) {
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static NONINTER_ONCE: std::sync::Once = std::sync::Once::new();
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NONINTER_ONCE.call_once(|| signal_set_handlers(false));
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static INTER_ONCE: std::sync::Once = std::sync::Once::new();
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if interactive {
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INTER_ONCE.call_once(set_interactive_handlers);
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}
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}
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/// Mark that a signal is being handled.
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pub fn signal_handle(sig: Signal) {
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let sig = sig.code();
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let mut act: libc::sigaction = unsafe { std::mem::zeroed() };
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// These should always be handled.
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if sig == libc::SIGINT
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|| sig == libc::SIGQUIT
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|| sig == libc::SIGTSTP
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|| sig == libc::SIGTTIN
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|| sig == libc::SIGTTOU
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|| sig == libc::SIGCHLD
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{
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return;
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}
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act.sa_flags = 0;
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unsafe { libc::sigemptyset(&mut act.sa_mask) };
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act.sa_flags = libc::SA_SIGINFO;
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act.sa_sigaction = fish_signal_handler as usize;
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sigaction(sig, &act, std::ptr::null_mut());
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}
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pub fn get_signals_with_handlers(set: &mut libc::sigset_t) {
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unsafe { libc::sigemptyset(set) };
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for data in SIGNAL_TABLE.iter() {
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let mut act: libc::sigaction = unsafe { std::mem::zeroed() };
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unsafe { libc::sigaction(data.signal.code(), std::ptr::null(), &mut act) };
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// If SIGHUP is being ignored (e.g., because were were run via `nohup`) don't reset it.
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// We don't special case other signals because if they're being ignored that shouldn't
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// affect processes we spawn. They should get the default behavior for those signals.
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if data.signal == libc::SIGHUP && act.sa_sigaction == libc::SIG_IGN {
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continue;
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}
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if act.sa_sigaction != libc::SIG_DFL {
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unsafe { libc::sigaddset(set, data.signal.code()) };
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}
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}
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}
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/// Ensure we did not inherit any blocked signals. See issue #3964.
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pub fn signal_unblock_all() {
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unsafe {
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let mut iset: libc::sigset_t = std::mem::zeroed();
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libc::sigemptyset(&mut iset);
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libc::sigprocmask(libc::SIG_SETMASK, &iset, std::ptr::null_mut());
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}
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}
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/// A Sigchecker can be used to check if a SIGINT (or SIGHUP) has been delivered.
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pub struct SigChecker {
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topic: topic_t,
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gen: generation_t,
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}
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impl SigChecker {
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/// Create a new checker for the given topic.
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pub fn new(topic: topic_t) -> Self {
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let mut res = SigChecker { topic, gen: 0 };
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// Call check() to update our generation.
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res.check();
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res
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}
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/// Create a new checker for SIGHUP and SIGINT.
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pub fn new_sighupint() -> Self {
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Self::new(topic_t::sighupint)
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}
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/// Check if a sigint has been delivered since the last call to check(), or since the detector
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/// was created.
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pub fn check(&mut self) -> bool {
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let tm = topic_monitor_principal();
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let gen = tm.generation_for_topic(self.topic);
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let changed = self.gen != gen;
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self.gen = gen;
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changed
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}
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/// Wait until a sigint is delivered.
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pub fn wait(&self) {
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let tm = topic_monitor_principal();
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let gens = GenerationsList::invalid();
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gens.set(self.topic, self.gen);
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tm.check(&gens, true /* wait */);
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}
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}
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/// Struct describing an entry for the lookup table used to convert between signal names and signal
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/// ids, etc.
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struct LookupEntry {
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signal: Signal,
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name: &'static wstr,
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desc: &'static wstr, // Note: this needs to be translated via gettext before presenting it to the user.
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}
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impl LookupEntry {
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const fn new(signal: i32, name: &'static wstr, desc: &'static wstr) -> Self {
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Self {
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signal: Signal::new(signal),
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name,
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desc,
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}
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}
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}
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// Lookup table used to convert between signal names and signal ids, etc.
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#[rustfmt::skip]
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const SIGNAL_TABLE : &[LookupEntry] = &[
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LookupEntry::new(libc::SIGHUP, L!("SIGHUP"), L!("Terminal hung up")),
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LookupEntry::new(libc::SIGINT, L!("SIGINT"), L!("Quit request from job control (^C)")),
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LookupEntry::new(libc::SIGQUIT, L!("SIGQUIT"), L!("Quit request from job control with core dump (^\\)")),
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LookupEntry::new(libc::SIGILL, L!("SIGILL"), L!("Illegal instruction")),
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LookupEntry::new(libc::SIGTRAP, L!("SIGTRAP"), L!("Trace or breakpoint trap")),
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LookupEntry::new(libc::SIGABRT, L!("SIGABRT"), L!("Abort")),
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LookupEntry::new(libc::SIGBUS, L!("SIGBUS"), L!("Misaligned address error")),
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LookupEntry::new(libc::SIGFPE, L!("SIGFPE"), L!("Floating point exception")),
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LookupEntry::new(libc::SIGKILL, L!("SIGKILL"), L!("Forced quit")),
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LookupEntry::new(libc::SIGUSR1, L!("SIGUSR1"), L!("User defined signal 1")),
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LookupEntry::new(libc::SIGUSR2, L!("SIGUSR2"), L!("User defined signal 2")),
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LookupEntry::new(libc::SIGSEGV, L!("SIGSEGV"), L!("Address boundary error")),
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LookupEntry::new(libc::SIGPIPE, L!("SIGPIPE"), L!("Broken pipe")),
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LookupEntry::new(libc::SIGALRM, L!("SIGALRM"), L!("Timer expired")),
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LookupEntry::new(libc::SIGTERM, L!("SIGTERM"), L!("Polite quit request")),
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LookupEntry::new(libc::SIGCHLD, L!("SIGCHLD"), L!("Child process status changed")),
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LookupEntry::new(libc::SIGCONT, L!("SIGCONT"), L!("Continue previously stopped process")),
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LookupEntry::new(libc::SIGSTOP, L!("SIGSTOP"), L!("Forced stop")),
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LookupEntry::new(libc::SIGTSTP, L!("SIGTSTP"), L!("Stop request from job control (^Z)")),
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LookupEntry::new(libc::SIGTTIN, L!("SIGTTIN"), L!("Stop from terminal input")),
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LookupEntry::new(libc::SIGTTOU, L!("SIGTTOU"), L!("Stop from terminal output")),
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LookupEntry::new(libc::SIGURG, L!("SIGURG"), L!("Urgent socket condition")),
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LookupEntry::new(libc::SIGXCPU, L!("SIGXCPU"), L!("CPU time limit exceeded")),
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LookupEntry::new(libc::SIGXFSZ, L!("SIGXFSZ"), L!("File size limit exceeded")),
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LookupEntry::new(libc::SIGVTALRM, L!("SIGVTALRM"), L!("Virtual timefr expired")),
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LookupEntry::new(libc::SIGPROF, L!("SIGPROF"), L!("Profiling timer expired")),
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LookupEntry::new(libc::SIGWINCH, L!("SIGWINCH"), L!("Window size change")),
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LookupEntry::new(libc::SIGIO, L!("SIGIO"), L!("I/O on asynchronous file descriptor is possible")),
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LookupEntry::new(libc::SIGSYS, L!("SIGSYS"), L!("Bad system call")),
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LookupEntry::new(libc::SIGIOT, L!("SIGIOT"), L!("Abort (Alias for SIGABRT)")),
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#[cfg(any(bsd, target_os = "macos"))]
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LookupEntry::new(libc::SIGEMT, L!("SIGEMT"), L!("Unused signal")),
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#[cfg(any(bsd, target_os = "macos"))]
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LookupEntry::new(libc::SIGINFO, L!("SIGINFO"), L!("Information request")),
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#[cfg(target_os = "linux")]
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LookupEntry::new(libc::SIGSTKFLT, L!("SISTKFLT"), L!("Stack fault")),
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#[cfg(target_os = "linux")]
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LookupEntry::new(libc::SIGIOT, L!("SIGIOT"), L!("Abort (Alias for SIGABRT)")),
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#[cfg(target_os = "linux")]
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#[allow(deprecated)]
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LookupEntry::new(libc::SIGUNUSED, L!("SIGUNUSED"), L!("Unused signal")),
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#[cfg(target_os = "linux")]
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LookupEntry::new(libc::SIGPWR, L!("SIGPWR"), L!("Power failure")),
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// TODO: determine whether SIGWIND is defined on any platform.
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//LookupEntry::new(libc::SIGWIND, L!("SIGWIND"), L!("Window size change")),
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];
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// Return true if two strings are equal, ignoring ASCII case.
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fn equals_ascii_icase(left: &wstr, right: &wstr) -> bool {
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if left.len() != right.len() {
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return false;
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}
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for (lc, rc) in left.chars().zip(right.chars()) {
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if lc.to_ascii_lowercase() != rc.to_ascii_lowercase() {
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return false;
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}
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}
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true
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}
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/// Test if \c name is a string describing the signal named \c canonical.
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fn match_signal_name(canonical: &wstr, mut name: &wstr) -> bool {
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// Skip the "SIG" prefix if it exists.
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if name.char_count() >= 3 && equals_ascii_icase(name.slice_to(3), L!("sig")) {
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name = name.slice_from(3)
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}
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equals_ascii_icase(canonical.slice_from(3), name)
|
|
}
|
|
|
|
#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord)]
|
|
/// A wrapper around the system signal code.
|
|
pub struct Signal(NonZeroI32);
|
|
|
|
impl Signal {
|
|
/// Creates a new `Signal` to represent the passed system signal code `sig`.
|
|
/// Panics if `sig` is zero.
|
|
pub const fn new(sig: i32) -> Self {
|
|
match NonZeroI32::new(sig) {
|
|
None => panic!("Invalid zero signal value!"),
|
|
Some(result) => Signal(result),
|
|
}
|
|
}
|
|
|
|
/// Return the LookupEntry for ourself.
|
|
fn get_lookup_entry(&self) -> Option<&'static LookupEntry> {
|
|
SIGNAL_TABLE
|
|
.iter()
|
|
.find(|entry| entry.signal == self.code())
|
|
}
|
|
|
|
/// Get string representation of a signal.
|
|
/// Previously sig2wcs().
|
|
pub fn name(&self) -> &'static wstr {
|
|
match self.get_lookup_entry() {
|
|
Some(entry) => entry.name,
|
|
None => wgettext!("Unknown"),
|
|
}
|
|
}
|
|
|
|
/// Returns a description of the specified signal.
|
|
/// Previously signal_get_desc().
|
|
pub fn desc(&self) -> &'static wstr {
|
|
match self.get_lookup_entry() {
|
|
Some(entry) => wgettext_str(entry.desc),
|
|
None => wgettext!("Unknown"),
|
|
}
|
|
}
|
|
|
|
pub fn code(&self) -> i32 {
|
|
self.0.into()
|
|
}
|
|
/// Parses a string into the equivalent [`Signal`] sharing the same name.
|
|
/// Accepts both `SIGABC` and `ABC` to match against `Signal::SIGABC`. If the signal name is not
|
|
/// recognized, `None` is returned.
|
|
/// This also accepts integer codes via fish_wcstoi().
|
|
/// Previously sig2wcs().
|
|
pub fn parse(name: &wstr) -> Option<Signal> {
|
|
for entry in SIGNAL_TABLE.iter() {
|
|
if match_signal_name(entry.name, name) {
|
|
return Some(entry.signal);
|
|
}
|
|
}
|
|
|
|
if let Ok(num) = fish_wcstoi(name) {
|
|
if num > 0 {
|
|
return Some(Signal::new(num));
|
|
}
|
|
}
|
|
None
|
|
}
|
|
}
|
|
|
|
// Allow signals to be compared against i32.
|
|
impl PartialEq<i32> for Signal {
|
|
fn eq(&self, other: &i32) -> bool {
|
|
self.code() == *other
|
|
}
|
|
}
|
|
|
|
impl From<Signal> for i32 {
|
|
fn from(value: Signal) -> Self {
|
|
value.code()
|
|
}
|
|
}
|
|
|
|
impl From<Signal> for usize {
|
|
fn from(value: Signal) -> Self {
|
|
usize::try_from(value.code()).unwrap()
|
|
}
|
|
}
|
|
|
|
impl From<Signal> for NonZeroI32 {
|
|
fn from(value: Signal) -> Self {
|
|
value.0
|
|
}
|
|
}
|
|
|
|
// Need to use add_test for wgettext support.
|
|
|
|
#[test]
|
|
fn test_signal_name() {
|
|
let sig = Signal::new(libc::SIGINT);
|
|
assert_eq!(sig.name(), "SIGINT");
|
|
}
|
|
|
|
#[rustfmt::skip]
|
|
#[test]
|
|
fn test_signal_parse() {
|
|
assert_eq!(Signal::parse(L!("SIGHUP")), Some(Signal::new(libc::SIGHUP)));
|
|
assert_eq!(Signal::parse(L!("sigwinch")), Some(Signal::new(libc::SIGWINCH)));
|
|
assert_eq!(Signal::parse(L!("TSTP")), Some(Signal::new(libc::SIGTSTP)));
|
|
assert_eq!(Signal::parse(L!("TstP")), Some(Signal::new(libc::SIGTSTP)));
|
|
assert_eq!(Signal::parse(L!("sigCONT")), Some(Signal::new(libc::SIGCONT)));
|
|
assert_eq!(Signal::parse(L!("SIGFOO")), None);
|
|
assert_eq!(Signal::parse(L!("")), None);
|
|
assert_eq!(Signal::parse(L!("SIG")), None);
|
|
assert_eq!(Signal::parse(L!("سلام")), None);
|
|
|
|
assert_eq!(Signal::parse(&libc::SIGINT.to_wstring()), Some(Signal::new(libc::SIGINT)));
|
|
assert_eq!(Signal::parse(L!("0")), None);
|
|
assert_eq!(Signal::parse(L!("-0")), None);
|
|
assert_eq!(Signal::parse(L!("-1")), None);
|
|
}
|
|
|
|
#[test]
|
|
#[cfg(any(target_os = "freebsd", target_os = "netbsd", target_os = "openbsd"))]
|
|
/// Verify bsd feature is detected on the known BSDs, which gives us greater confidence it'll work
|
|
/// for the unknown ones too. We don't need to do this for Linux and macOS because we're using
|
|
/// rust's native OS targeting for those.
|
|
fn bsd_signals() {
|
|
assert_eq!(Signal::parse(L!("SIGEMT")), Some(Signal::new(libc::SIGEMT)));
|
|
assert_eq!(
|
|
Signal::parse(L!("SIGINFO")),
|
|
Some(Signal::new(libc::SIGINFO))
|
|
);
|
|
}
|