in DOS,you call CPU registers like int86(.........).what is the eqivalent in linux??in which header file??

if your trying to call a bios interrupt you cant, when the kernel enters protected mode it takes the first 32(i think) interrupts for the cpu so the bios interrupts that were there like 0x10(vga) arnt accessable. obviously the 0x21 interrupt was provided by dos and isnt there either.

the kernel syscalls are accessable by int 0x80 and are listed in /usr/src/asm/unistd.h but are all available through glibc.

if you desperatly need to call an interrupt from C although i cant imagine why, then you could just do a bit of inline assembly.

thanks for the information.that was what i was looking for.