asked on

Passing sockaddr_in structure won't work

Hey,

I'm passing a sockadd_in struct to a function but when it gets there it's empty:

/*here it prints the address, if requested*/
remove(sockfd,serverAddr);

void remove(int socketfd, struct sockaddr_in serverAddr){

/*here it prints 0.0.0.0*/
printf("%s", inet_ntoa(serverAddr.sin_addr.s_addr));

}

bass20

ASKER

PS: I can't pass the address of the struct because I'll use sendto in function remove() and it needs to use the real address of the struct not the address of a pointer that's been passed. Hence, sendto's perror gives me invalid argument...

jkr

I think you got the concept of pointers and adresses wrong - simply use

void remove(int socketfd, struct sockaddr_in* serverAddr){

printf("%s", inet_ntoa(serverAddr->sin_addr.s_addr));

sendto (socketfd, buf, len, flags, serverAddr, sizeof ( struct sockaddr_in));

}

bass20

ASKER

In that case, when you do

sendto (socketfd, buf, len, flags, serverAddr, sizeof ( struct sockaddr_in));

you'll be passing sendto the address of serverAddr when it expects the structure itself

jkr

>>you'll be passing sendto the address of serverAddr when it expects the structure itself

No.

ASKER CERTIFIED SOLUTION

sunnycoder

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bass20

ASKER

"This old question needs to be finalized"

I'm quite aware of that, and you may notice that I closed two other questions that were awaiting an answer to be accepted; the reason I didn't on this one, is that I tried twice to do so and I couldn't get the Accept button on Mozilla; I had to clear all cache/cookies, log in and reload question twice to get the button.

I wasn't intending to leave the question open forever, if I didn't close it before, it was because I was unable to do so

jkr

bass20 - I am sorry to say so, you have no clue how EE works.

bass20

ASKER

I know that message was automatic, I posted an answer so none of the people that helped me would think that I didn't pay attention to their posts

jkr

>>I know that message was automatic

Well, and you accepted a comment that baiscally said 'jkr has guided you correctly'...