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fix(terminal): interrupt/got_int hangs terminal (#30056)
Upon `terminal_enter`, `mapped_ctrl_c` is set in order to avoid `CTRL-C` interrupts (which is proxied to the terminal process instead), `os_inchar` will then test `mapped_ctrl_c` against `State` and set `ctrl_c_interrupts=false` which prevents `process_ctrl_c` from setting `got_int=true` in a terminal state. However, if `got_int` is set outside of `process_ctrl_c`, e.g. via `interrupt()`, this will hang the neovim process as `terminal_execute` will enter an endless loop as `got_int` will never be cleared causing `safe_vgetc` to always return `Ctrl_C`. A minimal example reproducing this bug: ```vim :autocmd TermEnter * call timer_start(500, {-> interrupt()}) :terminal :startinsert ``` To fix, we make sure `got_int` is cleared inside `terminal_execute` when it detects `Ctrl_C`. Closes #20726 Co-authored-by: zeertzjq <zeertzjq@outlook.com>
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@ -782,6 +782,12 @@ static int terminal_execute(VimState *state, int key)
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FALLTHROUGH;
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default:
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if (key == Ctrl_C) {
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// terminal_enter() always sets `mapped_ctrl_c` to avoid `got_int`. 8eeda7169aa4
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// But `got_int` may be set elsewhere, e.g. by interrupt() or an autocommand,
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// so ensure that it is cleared.
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got_int = false;
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}
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if (key == Ctrl_BSL && !s->got_bsl) {
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s->got_bsl = true;
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break;
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@ -312,6 +312,16 @@ describe(':terminal buffer', function()
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pcall_err(command, 'write test/functional/fixtures/tty-test.c')
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)
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end)
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it('external interrupt (got_int) does not hang #20726', function()
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eq({ mode = 't', blocking = false }, api.nvim_get_mode())
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command('call timer_start(0, {-> interrupt()})')
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feed('<Ignore>') -- Add input to separate two RPC requests
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eq({ mode = 't', blocking = false }, api.nvim_get_mode())
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feed([[<C-\><C-N>]])
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eq({ mode = 'nt', blocking = false }, api.nvim_get_mode())
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command('bd!')
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end)
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end)
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describe(':terminal buffer', function()
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