Port shell_modes

The C++ one is still there but it's only used in dead code.

fish-rust/src/common.rs

@@ -30,7 +30,7 @@ use std::ops::{Deref, DerefMut};
 use std::os::unix::prelude::*;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicI32, AtomicU32, Ordering};
-use std::sync::{Arc, Mutex, TryLockError};
+use std::sync::{Arc, Mutex, MutexGuard, TryLockError};
 use std::time;
 
 // Highest legal ASCII value.
@@ -1011,14 +1011,8 @@ pub fn exit_without_destructors(code: libc::c_int) -> ! {
     unsafe { libc::_exit(code) };
 }
 
-pub fn shell_modes() -> &'static libc::termios {
-    let modes = crate::ffi::shell_modes_ffi() as *const libc::termios;
-    unsafe { &*modes }
-}
-
-pub fn shell_modes_mut() -> &'static mut libc::termios {
-    let modes = crate::ffi::shell_modes_ffi() as *mut libc::termios;
-    unsafe { &mut *modes }
+pub fn shell_modes() -> MutexGuard<'static, libc::termios> {
+    crate::reader::SHELL_MODES.lock().unwrap()
 }
 
 /// The character to use where the text has been truncated. Is an ellipsis on unicode system and a $

fish-rust/src/ffi.rs

@@ -46,8 +46,6 @@ include_cpp! {
     generate!("flog_setlinebuf_ffi")
     generate!("activate_flog_categories_by_pattern")
 
-    generate!("shell_modes_ffi")
-
     generate!("log_extra_to_flog_file")
 
     generate!("wgettext_ptr")

fish-rust/src/fish_key_reader.rs

@@ -44,13 +44,14 @@ fn should_exit(recent_chars: &mut Vec<u8>, c: char) -> bool {
     recent_chars.push(c);
 
     for evt in [VINTR, VEOF] {
-        if c == shell_modes().c_cc[evt] {
-            if recent_chars.iter().rev().nth(1) == Some(&shell_modes().c_cc[evt]) {
+        let modes = shell_modes();
+        if c == modes.c_cc[evt] {
+            if recent_chars.iter().rev().nth(1) == Some(&modes.c_cc[evt]) {
                 return true;
             }
             eprintf!(
                 "Press [ctrl-%c] again to exit\n",
-                char::from(shell_modes().c_cc[evt] + 0x40)
+                char::from(modes.c_cc[evt] + 0x40)
             );
             return false;
         }
@@ -286,15 +287,16 @@ fn setup_and_process_keys(continuous_mode: bool, verbose: bool) -> ! {
     signal_set_handlers(true);
     // We need to set the shell-modes for ICRNL,
     // in fish-proper this is done once a command is run.
-    unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, shell_modes()) };
+    unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, &*shell_modes()) };
 
     if continuous_mode {
         eprintf!("\n");
         eprintf!("To terminate this program type \"exit\" or \"quit\" in this window,\n");
+        let modes = shell_modes();
         eprintf!(
             "or press [ctrl-%c] or [ctrl-%c] twice in a row.\n",
-            char::from(shell_modes().c_cc[VINTR] + 0x40),
-            char::from(shell_modes().c_cc[VEOF] + 0x40)
+            char::from(modes.c_cc[VINTR] + 0x40),
+            char::from(modes.c_cc[VEOF] + 0x40)
         );
         eprintf!("\n");
     }

fish-rust/src/reader.rs

@@ -39,8 +39,8 @@ use crate::color::RgbColor;
 use crate::common::{
     escape, escape_string, exit_without_destructors, fish_reserved_codepoint, get_ellipsis_char,
     get_obfuscation_read_char, redirect_tty_output, scoped_push_replacer, scoped_push_replacer_ctx,
-    shell_modes, shell_modes_mut, str2wcstring, wcs2string, write_loop, EscapeFlags,
-    EscapeStringStyle, ScopeGuard, PROGRAM_NAME, UTF8_BOM_WCHAR,
+    shell_modes, str2wcstring, wcs2string, write_loop, EscapeFlags, EscapeStringStyle, ScopeGuard,
+    PROGRAM_NAME, UTF8_BOM_WCHAR,
 };
 use crate::compat::MB_CUR_MAX;
 use crate::complete::{
@@ -126,6 +126,9 @@ enum ExitState {
 
 static EXIT_STATE: AtomicU8 = AtomicU8::new(ExitState::None as u8);
 
+pub static SHELL_MODES: Lazy<Mutex<libc::termios>> =
+    Lazy::new(|| Mutex::new(unsafe { std::mem::zeroed() }));
+
 /// Mode on startup, which we restore on exit.
 static TERMINAL_MODE_ON_STARTUP: Lazy<Mutex<libc::termios>> =
     Lazy::new(|| Mutex::new(unsafe { std::mem::zeroed() }));
@@ -756,9 +759,9 @@ pub fn reader_init() {
     tty_modes_for_external_cmds.c_iflag &= !IXOFF;
 
     // Set the mode used for the terminal, initialized to the current mode.
-    *shell_modes_mut() = *tty_modes_for_external_cmds;
+    *shell_modes() = *tty_modes_for_external_cmds;
 
-    term_fix_modes(shell_modes_mut());
+    term_fix_modes(&mut shell_modes());
 
     drop(terminal_mode_on_startup);
     drop(tty_modes_for_external_cmds);
@@ -1695,7 +1698,7 @@ impl ReaderData {
         }
 
         // Set the new modes.
-        if unsafe { libc::tcsetattr(zelf.conf.inputfd, TCSANOW, shell_modes()) } == -1 {
+        if unsafe { libc::tcsetattr(zelf.conf.inputfd, TCSANOW, &*shell_modes()) } == -1 {
             let err = errno().0;
             if err == EIO {
                 redirect_tty_output();
@@ -1926,7 +1929,7 @@ impl ReaderData {
         // tty alone, run the commands in shell mode, and then restore shell modes.
         let mut res;
         loop {
-            res = unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, shell_modes_mut()) };
+            res = unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, &*shell_modes()) };
             if res >= 0 || errno().0 != EINTR {
                 break;
             }
@@ -3323,21 +3326,21 @@ pub fn term_copy_modes() {
 
     // Copy flow control settings to shell modes.
     if (tty_modes_for_external_cmds.c_iflag & IXON) != 0 {
-        shell_modes_mut().c_iflag |= IXON;
+        shell_modes().c_iflag |= IXON;
     } else {
-        shell_modes_mut().c_iflag &= !IXON;
+        shell_modes().c_iflag &= !IXON;
     }
     if (tty_modes_for_external_cmds.c_iflag & IXOFF) != 0 {
-        shell_modes_mut().c_iflag |= IXOFF;
+        shell_modes().c_iflag |= IXOFF;
     } else {
-        shell_modes_mut().c_iflag &= !IXOFF;
+        shell_modes().c_iflag &= !IXOFF;
     }
 }
 
 /// Grab control of terminal.
 fn term_steal() {
     term_copy_modes();
-    while unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, shell_modes()) } == -1 {
+    while unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, &*shell_modes()) } == -1 {
         if errno().0 == EIO {
             redirect_tty_output();
         }
@@ -3484,7 +3487,7 @@ fn reader_interactive_init(parser: &Parser) {
         }
 
         // Configure terminal attributes
-        if unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, shell_modes_mut()) } == -1 {
+        if unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, &*shell_modes()) } == -1 {
             if errno().0 == EIO {
                 redirect_tty_output();
             }

src/common.cpp

@@ -58,8 +58,6 @@
 
 struct termios shell_modes;
 
-struct termios *shell_modes_ffi() { return &shell_modes; }
-
 const wcstring g_empty_string{};
 const std::vector<wcstring> g_empty_string_list{};
 

src/common.h

@@ -652,6 +652,4 @@ __attribute__((always_inline)) bool inline iswdigit(const wchar_t c) {
 #include "common.rs.h"
 #endif
 
-struct termios *shell_modes_ffi();
-
 #endif  // FISH_COMMON_H