Programming

Hello, I need to write a program using C language which allow me to change the IP and MAC addresses of a given interface... Now I fork the process and by exec I'm using the "ifconfig interf X.X.X.X" command... but i can't use this solution because i have to avoid the context switch... Can someone help me? I just need 2 functions who look like this:

int change_IP(char *name, char *newIP);
int change_MAC(char *name, char *newMAC);

obviously this is a "wrap" salple... but it usefull to understand that i need just to modify the 2 addresses!
Thank you and see you soon

What operating system are you on? There is no standardized API for what you want to do but all Unix and Unix-like operating systems have their own methods.

I'm on Ubuntu now... but it have to work on Angstrom too...

You realize that any system call can cause this context switch? That a system call is in fact a context switch? Running a system call stops the process until the system call finishes! What you're looking for doesn't exist.

Running strace on ifconfig in linux, I see it using ioctl with SIOCSIFADDR, SIOCGIFFLAGS, and SIOCSIFNETMASK.

Coronna made a pertinent remark. Is your motivation to avoid system(...) (or fork+exec) really sound? Do you have such constraints that definitively impeach you doing so? Quoting Albert: Make it as simple as possible, but not simpler...

Cheers, Loïc