Question

c99 standard , i am looking for system header file documentation ???

Answer 1

Buy the actual C99 standard.

From ANSI itself: http://webstore.ansi.org/RecordDetail.aspx?sku=ISO%2fIEC+9899%3a1999

Or from iso:

http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=29237

or:

http://infostore.saiglobal.com/store/Details.aspx?DocN=ISO20959187604


The complete C99 standard, useful if you're writing compilers or operating systems.