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Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.1
From: |
Graham Jones |
Subject: |
Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53 |
Date: |
Thu, 6 Nov 2014 13:31:49 +1100 |
Thanks Chet.
Couple of notes:
1) I’m not setting HISTFILESIZE, only HISTSIZE. HISTFILESIZE is getting set for
me based on my choice of HISTSIZE (though I assume this is something that bash
does that you know about).
2) As mentioned in the initial bug report, if I set PROMPT_COMMAND='history -a;
history -r’ in my profile, my terminal was immediately hanging on
initialisation. Since reseting the history file though, this no longer seems to
be the case.
> On 6 Nov 2014, at 1:25 pm, Chet Ramey <chet.ramey@case.edu> wrote:
>
> On 11/4/14 5:16 PM, Piotr Grzybowski wrote:
>> Chet: for reasons unexplained calls to read_history_range at
>>
>> history.def:219
>> 219 result = read_history_range (filename, history_lines_in_file,
>> -1);
>>
>> return more and more records (77824 is above my HISTFILESIZE):
>
> There is an issue with this particular, relatively infrequent, set of
> circumstances:
>
> 1. HISTFILESIZE > HISTSIZE
> 2. Actual size of the history file > HISTSIZE
> 3. history list contains HISTSIZE entries
> 4. the user executes a sequence of `history -a; history -n'. Even
> `history -a; history -r' would probably prevent this, at the cost
> of more malloc/free operations.
>
> In this case, history_lines_in_file (which, despite its name, is supposed
> to keep track of how many lines bash has read from the history file) is
> calculated incorrectly. The result is that bash reads way too many lines
> from the history file each time.
>
> There are a couple of ways to fix it: one that uses facilities the history
> library provides today and one that changes the history library to expose
> the values more directly. One will appear in the next snapshot.
>
> Chet
>
> --
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
> ``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, (continued)
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Chet Ramey, 2014/11/05
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Piotr Grzybowski, 2014/11/06
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Greg Wooledge, 2014/11/06
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Chet Ramey, 2014/11/06
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Piotr Grzybowski, 2014/11/07
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Eric Blake, 2014/11/07
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Piotr Grzybowski, 2014/11/07
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Graham Jones, 2014/11/07
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Piotr Grzybowski, 2014/11/07
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Chet Ramey, 2014/11/05
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53,
Graham Jones <=
- Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53, Piotr Grzybowski, 2014/11/06