Re: Modification required in cout function

[naveen yadav <yad.naveen@gmail.com>]

Thanks a lot Jonathan, it works for me ..


On Sat, Jan 7, 2012 at 5:32 PM, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> On 7 January 2012 06:49, naveen yadav wrote:
>> Thanks a lot Jonathan,
>>
>> The reason for modifying stdlib is needed because i do not have source
>> code of binary which i want to test.
>> will you pls let me know execty lines in ios_init.cc  which I need to
>> modify , this will help me a lot.
>
> Put
> std::cout.setstate(ios_base::failbit);
>
> after cout has been constructed, so around line 102
>
>
>> Thanks
>>
>> On Fri, Jan 6, 2012 at 6:25 PM, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
>>> On 6 January 2012 12:41, naveen yadav wrote:
>>>> The reason is that is we want to check effect of cout on application booting.
>>>> Below is simple hello world program, It still call write() system
>>>> call. This may delay if
>>>> we have lots of cout in applications.
>>>> so we want that cout simply return without call of write().
>>>
>>> std::cout.setstate(ios_base::failbit);
>>>
>>> If you do that at the top of main() it will prevent any writes to
>>> cout.  If your library writes to cout before main() starts, you could
>>> put that in a global object's constructor (and use
>>> __attribute__((init_priority(101))) to make it run before other global
>>> constructors)
>>>
>>> Or if you really insist on modifying the stdlib, do that in
>>> ios_init.cc in ios_base::Init::Init() (not in sync_with_stdio, that's
>>> the wrong place)