kernel C code question

h/w · 05-17-2004, 09:09 PM

hi again ...
can someone tell me how i'm supposed to be interpreting this:

/* Return the current time and put it in *TIMER if TIMER is not NULL. */
extern time_t time (time_t *__timer) __THROW;

i guess the part that throws me off is the __timer and __THROW

what does __ in front of time mean. and what is __THROW?

once again ... thanks.

infamous41md · 05-17-2004, 09:23 PM

__timer is just a variable. u can start variables with '_'. the __THROW i have no idea. it is not a gcc or cpp keyword to the best of my knowledge, or if it is i can't find it in the info pages for either. in c++ u "throw" exceptions, but i dont think this is that.

h/w · 05-17-2004, 09:38 PM

thnx for replying (again)...
yeah, i have no idea what that __THROW is supposed to do in C.
stupid question: is there any reason for using __ (it has nothing to do with namespaces in C, right?) in front of variables?

thnx once again.

shishir · 05-18-2004, 01:52 AM

it i think, is mostly used to differentiate between the variables system uses for its own purposes...so that you dont come on and mess up the variables with your own variables...users are expected NOT to use __ in their variables ...
i has no other implication AFAIK

__THROW might be a compiler directive something like __attribute__(packed ) etc,

or a builtin gcc function to handle exceptions..just a guess tho...

h/w · 05-18-2004, 08:30 AM

thanks you two.