what's this error mean?

[Lakshmipathi]

Hi all,
When i tried to complie a program, i get error like,
error: `gid_t' previously declared here
error: `uid_t' previously declared here


what's this error ?

[wje_lf]

It means that gid_t and uid_t have been declared at more than one place in your program.

If you look more closely at the details of the error messages, you'll find each location of the multiple declarations.

My guess is that you gave certain variables the names gid_t and uid_t. You're not supposed to do that, because those names have already been used as names of types (as opposed to names of variables). In general, you should avoid giving variables names that end in _t .

But my guess could be wrong.

If you can't figure out from the rest of the error messages what's going on, post all the error messages from this compilation and we'll take a crack at it.

[Lakshmipathi]

yes ..i think your right.actually i'm indeed accessing those kernel struct variables...but i have multiple kernels installed on my system...i think that's the problem.
I hope to remove old kernels and re-run the same program and get back here.
Thanks for your help.