C++Talk.NET

tikviva · Guest

Hi,

I am trying to port my Ping module from window to linux, and I've
encountered some odd, but interesting things.

I have a function to keep creating new sockets.

bool PingIt(unsigned long targetip)
{
// Create Variables
struct sockaddr_in target;
int newSocket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);

// Setup destination socket address
target.sin_addr.s_addr = inet_addr(szIP);
target.sin_family = AF_INET;
target.sin_port = 0;

// Send Echo
SendEcho(newSocket, &target);

// Use select() to wait for data to be received
// default timeout value = 2 sec
return(WaitForEchoReply(newSocket, timeout));
}

this guy works fine on window, but when it comes it linux, everytime
when the program calls PingIt(), the *newSocket* will remain the same
value. Unlike windows, it changes eveytime. That gives the program a
brand new socket. Do you guys know why?

This is interesting. Thanks for helping.

Best wishes,

- eric

[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]

tikviva · Guest

I know what I did wrong, in unix the select() requires *n+1* as the
first parameter. Since I've put the socket num in FD_SET(socketnum,
&readfds), it requres me to put socketnum+1 as the 1st parameter of
select().

- tikviva

[email]tikviva (AT) yahoo (DOT) com[/email] (tikviva) wrote in message news:<4b2febc7.0409172205.5219192f (AT) posting (DOT) google.com>...