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Re: Hash-bang line length


From: Chet Ramey
Subject: Re: Hash-bang line length
Date: Wed, 13 Jan 2016 11:18:38 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

On 1/13/16 5:25 AM, Ludovic Courtès wrote:
> Hello,
> 
> The ‘READ_SAMPLE_BUF’ macro in execute_cmd.c reads at most 80 bytes from
> the hash-bang line.  This is less than the already-small 128-byte limit
> in the Linux kernel¹ and can quite easily be hit².

That limit is huge compared to other Unixes, btw.

> What about changing it to 128 bytes (as well as the ‘sample’ array) to
> at least match Linux?
> 
> (It might even make sense to make it bigger so that Bash might succeed
> when the kernel simply fails.)

If the kernel returns an errno other than ENOEXEC, bash isn't going to
`succeed'.  This is entirely a cosmetic issue concerning the error message
bash prints when execve fails.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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