DragonFly BSD
DragonFly users List (threaded) for 2006-06
[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]

Re: [OT] C pointers: BSD versus Linux?

From: walt <wa1ter@xxxxxxxxxxxxx>
Date: Thu, 01 Jun 2006 08:21:28 -0700

Simon 'corecode' Schubert wrote:
> On 31.05.2006, at 20:37, jwatson@xxxxxxxxxxxx wrote:
>>> Style 1:
>>> time_t t*;
>>> time(t);

>> Also, style 1 is technically "incorrect" since you never allocated the
>> memory that t is pointing to before passing it into time().

> maybe the compiler on BSD by chance put NULL into "t" and thus made it a
> valid parameter?

First, thanks to all who replied!  I've been playing with gdb and I'm
seeing a significant difference between linux and *BSD.

I added a dummy variable to my program, like this:
time_t t*, d;
and then ran the program in gdb.  I printed out t and &d and
compared the two values under *BSD and linux.

What I see in linux is that the two values are miles apart,
but in *BSD they differ by only a few bytes.  I *assume* this
means that in *BSD, t is pointing to a valid memory location
very close to d, whereas in linux t is pointing to some
random number.  Does this seem a reasonable idea?

Thanks again for everyone's help.

[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]