N'day :)
Ralph Corderoy wrote in <20180904094356.6d78621...@orac.inputplus.co.uk>:
|>> On running this command, I type the four characters ‘bar\n’, and
|>> then Ctrl-D, my TTY's EOF character, before the three seconds have
|>> elapsed. It appears thus, with ‘␣’ being the cursor.
|>>
|>> $ sleep 3; mail -s foo $LOGNAME
|>> bar
|>> ␣
|>>
|>> As mail runs, it changes to
|>>
|>> $ sleep 3; mail -s foo $LOGNAME
|>> bar
|>> bar
|>> ^@␣
|>
|> I presume you have no*ignoreeof* and no*asksend* set.
|
| $ cat ~/.mailrc
| unset askcc
| unset asksend
| set encoding=8bit
| set sendcharsets=utf-8
| set dot
| set sendwait
| set line-editor-disable
| set stealthmua=noagent
| $
Interesting. And much more expensive than
unset askcc asksend
set encoding=8bit dot sendwait ...
Some expenses do not seem to matter to nmh users who consume
dozens of processes just for having a single look, of course. :-)
|> I wonder whether you would be helped with a shell alias that sets
|> *line-editor-disable* in addition, it would release the system from
|> quite some unnecessary burdens in this case.
|
|I see it is set.
There you go. Saving a lot.
|>> Despite my EOF, no shell prompt appears so I type another EOF. And
|>> then two more. Only then does mail exit and my $PS1 appear.
|>
|> Yes, in raw terminal mode VEOF has no meaning actually.
|
|Agreed. But as a user I shouldn't need to know that it's switched to
|raw mode. mail(1) used to be happy taking the TTY's EOF.
I absolutely agree with that. It should just work.
|>> The email that arrives has the null byte suggested by the ‘^@’.
|>
|> If you input a NUL byte we will not mangle you. Good.
|
|I did not input a NUL. As I said above, it was `bar\n' and Ctrl-D. And
|raw mode doesn't turn Ctrl-D into NUL. Here, I type `abc' Ctrl-D `def',
|wait for the `.', then Enter and Ctrl-D.
|
| $ (trap '' TTOU; old=`stty -g`; stty raw; sleep 3; stty $old; printf \
| .) & od -c
| abc^Ddef.
| 0000000 a b c 004 d e f \n
| 0000010
| $
|
|The Ctrl-D correctly appears as EOT, as I'd expect in raw mode.
I see. I meant ICANON (rather: of course), to what you could get
via ncurses(3) raw(3), for example, which has
#ifdef TERMIOS
buf.c_lflag &= (unsigned) ~(ICANON | ISIG | IEXTEN);
buf.c_iflag &= (unsigned) ~(COOKED_INPUT);
buf.c_cc[VMIN] = 1;
buf.c_cc[VTIME] = 0;
#else
buf.sg_flags |= RAW;
#endif
Always a pleasure.
Cheerio.
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
