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)
