[ale] Accessing /proc from C

[cfowler]

On Sat, 2002-12-28 at 23:37, Benjamin Dixon wrote:
> 
> This is nice. I looked around, and seeing how the proc system is accessed,
> as you indicate, its only really useful if you feel like messing with
> ASCII. I was just looking for data from the arp cache and ended up just
> doing some socket manipulation and ioctl to get the info I needed.
> Probably more portable anyway.


> 
> Thanks,#define ARPFILE "/proc/net/arp"

int
arp(int argc, char *argv[])
{
        FILE *fp;
        char buffer[1024];
        char ip[32], hw[32], mask[32], device[12];
        unsigned long hwtype;
        unsigned long flags;


        if((fp = fopen(ARPFILE, "r")) == NULL)
                err_quit("can not get stats");



        printf("\nIP address       HWtype     Flags   HW
address           Mask     Device\n");

        fgets(buffer, sizeof(buffer), fp); // Trash

        while(fgets(buffer, sizeof(buffer), fp) != NULL)
        {
                sscanf(buffer, "%s %X %X %s %s %s", &ip, &hwtype,
&flags,
                                &hw, &mask, &device);

                printf("%-16s    %-2X        %-2X    %-16s    %-8s
%-12s\n", ip, hwtype, flags, hw, mask, device);

        }

        printf("\n");

        return 0;
}


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