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getty: set tty attrs so that control chars are shown as ^c

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2014-10-02 13:45:21 +02:00
parent d3fe960271
commit cf76b5ce12
1 changed files with 9 additions and 8 deletions
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17
loginutils/getty.c
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@ -334,18 +334,19 @@ static void finalize_tty_attrs(void)
* observed to improve backspacing through Unicode chars
*/
/* line buffered input (NL or EOL or EOF chars end a line);
* recognize INT/QUIT/SUSP chars;
* echo input chars;
* echo BS-SP-BS on erase character;
* echo kill char specially, not as ^c (ECHOKE controls how exactly);
* erase all input via BS-SP-BS on kill char (else go to next line)
/* ICANON line buffered input (NL or EOL or EOF chars end a line);
* ISIG recognize INT/QUIT/SUSP chars;
* ECHO echo input chars;
* ECHOE echo BS-SP-BS on erase character;
* ECHOK echo kill char specially, not as ^c (ECHOKE controls how exactly);
* ECHOKE erase all input via BS-SP-BS on kill char (else go to next line)
* ECHOCTL Echo ctrl chars as ^c (else echo verbatim:
* e.g. up arrow emits "ESC-something" and thus moves cursor up!)
*/
G.tty_attrs.c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
G.tty_attrs.c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE | ECHOCTL;
/* Other bits in c_lflag:
* XCASE Map uppercase to \lowercase [tried, doesn't work]
* ECHONL Echo NL even if ECHO is not set
* ECHOCTL Echo ctrl chars as ^c (else don't echo) - maybe set this?
* ECHOPRT On erase, echo erased chars
* [qwe<BS><BS><BS> input looks like "qwe\ewq/" on screen]
* NOFLSH Don't flush input buffer after interrupt or quit chars