C program for getting IP address of standlone box with no sockets 7163

the Black Sun and said:

What? If you're going to call ifconfig, why not just use popen()?

FILE *FP; char buff1024;

FP=popen("-sbin-ifconfig bin-grep inetaddr","r"); if(!FP){ barf("popen(ifconfig) failed! Bailing out."); } while(fgets(buff,1024,FP)){ * parse data and do stuff with it * } pclose(FP);* continue program *

Unwilling to make system calls? Are you *sure* you know what you're doing? Maybe you should read the ifconfig source code as Peter T. Breuer suggested, so you can understand what it does. Generally, you *must* make system calls to do anything other than manipulate private-to-the-current-process data. read(), write(), open(), close(), and ioctl() are ... guess what, system calls. If your program doesn't use any system calls, it won't be able to do much. (Remember, the fopen() and fprintf() functions make system calls through the standard C library.)

Um. Network interfaces on Linux always have names of some sort, like eth0, usb0, ppp0, lo, and so forth. If you meant "might not have a DNS name", then that's cool. gethostname() should always return a valid hostname or EFAULT-EINVAL though.

The solution that'd take the least amount of time for you is to popen() ifconfig and parse the data returned. (Remember, Laziness is one of the virtues.) There are other ways, of course, but why not make use of the nifty POSIX stuff that's available if it makes your job easier? HTH,

-- Matt GThere is no Darkness in Eternity-But only Light too dim for us to see Brainbench MVP for Linux Admin mail: TRAP + SPAN don't belong ----------------------------- penguins, is Tux." --MegaHAL