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terminal: pop signal handler when terminal is restored
When disable_bits() changes the terminal attributes it uses
sigchain_push_common() to restore the terminal if a signal is received
before restore_term() is called. However there is no corresponding
call to sigchain_pop_common() when the settings are restored so the
signal handler is left on the sigchain stack. This leaves the stack
unbalanced so code such as
sigchain_push_common(my_handler);
...
read_key_without_echo(...);
...
sigchain_pop_common();
pops the handler pushed by disable_bits() rather than the one it
intended to. Additionally "git add -p" changes the terminal settings
every time it reads a key press so the stack can grow significantly.
In order to fix this save_term() now sets up the signal handler so
restore_term() can unconditionally call sigchain_pop_common(). There
are no callers of save_term() outside of terminal.c as the only
external caller was removed by e3f7e01b50
("Revert "editor: save and
reset terminal after calling EDITOR"", 2021-11-22). Any future callers
of save_term() should benefit from having the signal handler set up
for them.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
24d7ce383a
commit
f7da756566
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@ -11,7 +11,7 @@
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static void restore_term_on_signal(int sig)
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{
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restore_term();
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sigchain_pop(sig);
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/* restore_term calls sigchain_pop_common */
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raise(sig);
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}
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@ -31,14 +31,20 @@ void restore_term(void)
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tcsetattr(term_fd, TCSAFLUSH, &old_term);
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close(term_fd);
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term_fd = -1;
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sigchain_pop_common();
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}
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int save_term(int full_duplex)
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{
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if (term_fd < 0)
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term_fd = open("/dev/tty", O_RDWR);
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if (term_fd < 0)
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return -1;
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if (tcgetattr(term_fd, &old_term) < 0)
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return -1;
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sigchain_push_common(restore_term_on_signal);
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return (term_fd < 0) ? -1 : tcgetattr(term_fd, &old_term);
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return 0;
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}
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static int disable_bits(tcflag_t bits)
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@ -49,12 +55,12 @@ static int disable_bits(tcflag_t bits)
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goto error;
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t = old_term;
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sigchain_push_common(restore_term_on_signal);
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t.c_lflag &= ~bits;
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if (!tcsetattr(term_fd, TCSAFLUSH, &t))
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return 0;
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sigchain_pop_common();
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error:
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close(term_fd);
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term_fd = -1;
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@ -100,6 +106,8 @@ void restore_term(void)
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return;
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}
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sigchain_pop_common();
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if (hconin == INVALID_HANDLE_VALUE)
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return;
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@ -134,6 +142,7 @@ int save_term(int full_duplex)
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GetConsoleMode(hconin, &cmode_in);
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use_stty = 0;
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sigchain_push_common(restore_term_on_signal);
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return 0;
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error:
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CloseHandle(hconin);
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@ -177,10 +186,10 @@ static int disable_bits(DWORD bits)
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if (save_term(0) < 0)
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return -1;
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sigchain_push_common(restore_term_on_signal);
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if (!SetConsoleMode(hconin, cmode_in & ~bits)) {
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CloseHandle(hconin);
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hconin = INVALID_HANDLE_VALUE;
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sigchain_pop_common();
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return -1;
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}
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@ -1,7 +1,15 @@
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#ifndef COMPAT_TERMINAL_H
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#define COMPAT_TERMINAL_H
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/*
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* Save the terminal attributes so they can be restored later by a
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* call to restore_term(). Note that every successful call to
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* save_term() must be matched by a call to restore_term() even if the
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* attributes have not been changed. Returns 0 on success, -1 on
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* failure.
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*/
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int save_term(int full_duplex);
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/* Restore the terminal attributes that were saved with save_term() */
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void restore_term(void);
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char *git_terminal_prompt(const char *prompt, int echo);
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