C program for client using socket on ubuntu linux end not running

Question

I am new to socket programming. I tried to execute a program today. My intention was to check whether the server is available or not. Expecting the output "Failed!" but my program doesn't seem to work. The code shows no error during compilation which makes me wonder if I am using the Linux API correctly. The following is my code...

#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>

int main()
    {
    char servIP[]="127.0.0.1";
    char check[]="check";
    int SrvConnect,ret;
    struct sockaddr_in servAdr;
    //printf("Test");
    SrvConnect=socket(AF_INET,SOCK_STREAM,0);
    servAdr.sin_addr.s_addr=inet_addr(servIP);
    servAdr.sin_port=htons(1000);
    ret=sendto(SrvConnect,&check,sizeof(check),0,(struct sockaddr *)&servAdr,sizeof(servAdr));
    if(ret==-1)
        printf("\nFailed!\n");
    //printf("Test");
    close(SrvConnect);
    }

I have tried placing several output statement at the beginning and end of the code itself (now commented). But even those lines do not execute. Please don't mind if it is a silly mistake. A am really new to this and I have nobody to guide me. Thank You for reading.

Instead of using printf to print the error, use perror as it will print a more complete error message based on errno. — Some programmer dude
– Some programmer dude, Commented Mar 1, 2013 at 12:49
Consider reading a good book like advancedlinuxprogramming.com — Basile Starynkevitch
– Basile Starynkevitch, Commented Mar 1, 2013 at 12:58

Some programmer dude · Accepted Answer · 2013-03-01 12:50:34Z

2

The problem is that you have created a TCP socket. TCP sockets needs to be connected to the server before you can send anything. Try calling connect first to connect to the server, and the use write or send to send data.

answered Mar 1, 2013 at 12:50

Some programmer dude

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2 Comments

Debabrata Roy Over a year ago

Thank you very much. That was silly of me. Sorry for wasting your time.

Some programmer dude Over a year ago

@user2051577 Don't worry about it. Everyone looks "silly" when they're new. It'll get better. :)

Edouard Thiel · Accepted Answer · 2013-03-01 13:02:11Z

1

You also need to set servAdr.sin_family = AF_INET before connecting. If connection fail, better use perror() to print the error.

answered Mar 1, 2013 at 13:02

Edouard Thiel

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1 Comment

Debabrata Roy Over a year ago

Thank you very much sorry for your trouble!

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