segmentation error (core dumped) Linux in c

nasim751 · 01-26-2008, 08:24 AM

hello,
how do u deal this segmentation error (core dumped) after compile program using this commend:
gcc -g -O2 -Wall -o descry descry.o -lpcap -lnet.
see this following main part
int
main(int argc, char *argv[])
{
int c;
u_char flags;
char *device;
char *capture_file;
struct des_pack *gp;
printf("[TCP port scan detection tool]\n");

flags = 0;
device = NULL;
capture_file = NULL;
while ((c = getopt(argc, argv, "afi:vs:h")) != EOF)
{
switch (c)
{
case 'a':
flags |= ALL_HOSTS;
break;
case 'f':
capture_file = optarg;
break;
case 'i':
device = optarg;
break;
case 'v':
break;
case 's':
flags |= DO_SYSLOG;
break;
case 'h':
default:
usage(argv[0]);
return (EXIT_FAILURE);
}
}

Hko · 01-26-2008, 08:55 AM

The only thing wrong (apart from DO_SYSLOG and ALL_HOSTS not defined is this:

Code:

    while ((c = getopt(argc, argv, "afi:vs:h")) != EOF)
    {
        switch (c)
        {
            case 'a':
                flags |= ALL_HOSTS;
                break;
            case 'f':
                capture_file = optarg;   # <== using optarg while no ':' after 'f' in opt-string
                break;
            case 'i':
                device = optarg;
                break;
            case 'v':
                break;
            case 's':
                flags |= DO_SYSLOG;
                break;
            case 'h':
            default:
                usage(argv[0]);
                return (EXIT_FAILURE);
        }
    }

kaz2100 · 01-27-2008, 05:06 PM

Hya,

Can you also
1. use [code] tag
2. post #include lines
3. spell full and correct English?

Happy Penguins!