linux-kernel - Re: [PATCH] Stop docproc segfaulting when SRCTREE isn't set.

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Message-ID: <470BB933.8010402@oracle.com>
Date:	Tue, 09 Oct 2007 10:24:03 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>
CC:	Rob Landley <rob@...dley.net>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, rdunlap@...otime.net
Subject: Re: [PATCH] Stop docproc segfaulting when SRCTREE isn't set.

Ahmed S. Darwish wrote:
> On Tue, Oct 09, 2007 at 08:55:00AM -0700, Randy Dunlap wrote:
>> On Tue, 9 Oct 2007 15:03:15 +0200 Ahmed S. Darwish wrote:
>>
>>> Hi Rob,
>>>
>>> On Tue, Oct 09, 2007 at 01:25:18AM -0500, Rob Landley wrote:
>>> [...]
>>>>  	FILE * infile;
>>>> +
>>>> +	srctree = getenv("SRCTREE");
>>>> +	if (!srctree) srctree = getcwd(NULL,0);
>>>>  	if (argc != 3) {
>>>>  		usage();
>>>>  		exit(1);
>>> $ man getcwd
>>>
>>>  char *getcwd(char *buf, size_t size);
>>>       
>>>  As an extension to the POSIX.1 standard, Linux (libc4, libc5, glibc) getcwd() 
>>>  allocates the buffer dynamically using malloc() if buf is NULL on call.
>>>
>>> Shouldn't "srctree" be free()ed in case getenv("SRCTREE") failed ?
>> What is there to free() at that point?  If getenv() fails (i.e.,
>> the env. variable is not found), it returns NULL.
>> or do I need another cup of coffee?
>>
> 
> I meant if getenv() failed, "srctree = getcwd(NULL, 0)" will let 
> "srctree" point to a _ malloc()ed _ buffer representing PWD. 
> As said in the manpage, this buffer needs to be free()ed after usage.
> Right or I'm the one who needs that cup of coffee :) ?

so it needs to be freed at program termination, is that what you are
saying?  That will happen automatically (along with any open files being
closed, etc.).

-- 
~Randy
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