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Re: About subshell implementation
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From: |
Chet Ramey |
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Subject: |
Re: About subshell implementation |
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Date: |
Tue, 17 Mar 2020 15:38:48 -0400 |
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Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 |
On 3/17/20 2:47 PM, kevin shell wrote:
> EHLO bash users. :-D
>
> How bash or
> any Boune shell in general
> implements subshell construct
> (cmdlists) ?
> Does it have to call fork(2)+ execce(2) or
> just fork(2) system call only?
It calls fork to create the subshell and executes `cmdlist' in that
subshell. It may call execve as appropriate when executing simple commands
as part of `cmdlist'.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU address@hidden http://tiswww.cwru.edu/~chet/