Help me understand why 'eof' in canonical mode works strange in Expect script (and differ from Linux).
Oleksandr Gavenko
gavenkoa@gmail.com
Fri Sep 16 21:44:00 GMT 2011
This script work fine:
$ cat eof.exp
#!/usr/bin/env expect
set stty_init "sane cooked -echo"
spawn sort
send \x04
expect eof
wait
But if I modify send expression to any like (so ^D is last char):
send booooo\x04
script infinitely await closing stdout by "sort", but
sort itself wait for closing stdin, which not happen.
Look like \x04 have 'eof' meaning in Expect pty only
in case then spawned process stdin empty.
For example this is not work ("sort" don't get 'eof'):
spawn sort
send bbb\raaa\r\0x04
expect -re .+ { send_user $expect_out(buffer); exp_continue } eof { }
But this script work fine (but it is have drawback in 1 sec delay
before "sort" get 'eof'...):
spawn sort
send bbb\raaa\r
set timeout 1
expect {
-re .+ { send_user $expect_out(buffer); exp_continue }
timeout { send \x04; exp_continue }
eof { }
}
I try Linux and surprised that all my Expect scripts work fine.
Also note that sending another special character seems work in
send booooo\x03
pattern (on INTR with "booo\x03" "sort" exit,
on QUIT with "booo\x1c" "sort" exit and 'sort.exe.stackdump' created).
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