Questio about C syntax

[tarch]

Hi all,
and I found this declaration:

__u8 local_df:1;

so __u8 is the type, my question is what is the ":1" after the variable name?

Bye, and thank you.

 

[ArkM]

It's a bit field declaration of a member of a structure. Obviously, __u8 is typedef'ed name (probably, alias of unsigned char). So it's 1 bit length value packed within a byte. Now you may get (or put this bit via assignment) this bit (str.local_df or what else).
Alas, bit field allocation and alignment within a structure object is implementation-defined by C Standard...