> On 26 Apr 2016, at 8:38 pm, Bram Moolenaar <[email protected]> wrote:
>
> You can now use ch_status() for that. If it returns "open" or
> "buffered" there may be more to read. When "closed" then it's done.
>
> I have added this example in the help:
>
> func! CloseHandler(channel)
> while ch_status(a:channel) == 'buffered'
> echomsg ch_read(a:channel)
> endwhile
> endfunc
> let job = job_start(command, {'close_cb': 'CloseHandler'})
Should the condition be `while ch_status(a:channel) == 'buffered' ||
ch_status(a:channel) == 'open'` as per the description?
I upgraded to 7.4.1795 and tried out the example as is.
I couldn't find the example in the help.
Every few callbacks the screen needed a `:redraw!` to:
- display the correct signs (my handler updates them)
- display the cursor in the correct position (getpos('.') showed the right
coordinates but the cursor was displayed elsewhere).
I haven't been able to reproduce this consistently. I tried adding a
`redraw`/`redraw!` as the last line of my handler but it didn't make any
difference.
Every few dozen callbacks `ch_read(a:channel)` threw an E906 error, though
again I'm not able to reproduce it consistently. Perhaps there is a race
condition where the channel is closed between checking its status and reading
from it? I modified my handler to:
function! CloseHandler(channel)
let output = ''
try
while ch_status(a:channel) == 'buffered'
let line = ch_read(a:channel)
if line !=# 'DETACH'
let output .= line."\n"
endif
endwhile
echom output
endfunction
...which seemed to work well, at least until Vim crashed:
Vim: Caught deadly signal SEGV
Vim(85664,0x7fff7a952000) malloc: *** error for object 0x7ff2106739e8:
incorrect checksum for freed object - object was probably modified after being
freed.
*** set a breakpoint in
malloc_error_break to debug
Vim: Finished.
Vim: Double signal, exiting
Abort trap: 6
I don't know how to set a breakpoint in malloc_error_break so I wasn't able to
debug this, sorry. When it happened there was nothing unusual in the channel
log.
I also implemented my job_start using an out_cb handler again instead of a
close_cb handler. The occasional-missing-callback problem has disappeared and
it all worked perfectly. Thanks!
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