Sorry if I posted 2 separate questions.
I'm currently doing socket programming on my current task. As you can see below in the client side. I've tried to do a loop so I will be able to get prompt for input over and over again.
This is the code.
Code:
do{
printf("Please your name > ");
scanf("%s",name);
write(clientFd,name,strlen(name));
}while(strcmp("exit",name)!=0);
It worked for the first time, but the second time it asked me for input but it did not print anything on the server side. After entering the second input it exited from the terminal.
I've check up the loop and realize it was the write problem. Any way to solve this?
From the code snipit you posted it's difficult to say what is happening. My only guess what you've provided is that the space allocated for name isn't large enough to handle the string that you entered.
It would help if you could post the whole routine which would include the declaration of name, as well as the two strings that you entered from the tty.
ret = write(clientFd,name,strlen(name));
printf("Write ret: %d\n", ret);
Also with this loop you will write 'exit' to the fd. Maybe use a while(1) { } and place
Code:
while (1) {
int ret;
/* input stuff */
if (strcmp(name, "exit") == 0)
break;
ret = write(clientFd,name,strlen(name));
if (ret == -1) perror("write");
printf("Write returned: %d\n", ret);
}
It also may help to issue a read() to ensure the socket is available... My guess is that you're getting a SIGPIPE by writing to a broken socket. you can set SO_NOSIGPIPE with setsockopt
while(1){
int ret;
char country[300];
printf("Please enter country name > ");
scanf("%s",country);
if (strcmp(country, "exit") == 0)
break;
else
ret = write(clientFd,country,strlen(country));
//f (ret == -1) perror("write");
//printf("Write returned: %d\n", ret);
//write(clientFd,country,strlen(country));
}
Server Side
Code:
readData();
bzero(country,300);
c=read(clientFd,country,300);
printf("You have entered: %s\n",country);
printf ("%s Capital : %s\n", country,getCapital(country));
printf ("%s Currency Code : %s\n", country,getCurrencyCode(country));
char* capital = getCapital (country);
char* currency = getCurrencyCode(country);
close (clientFd); /* Close the socket */
exit (/* EXIT_SUCCESS */ 0); /* Terminate */
So like what you all said it might be the reading part that is the the problem.
From what I think is just the read problem?
Reason is I comment the write link it just run the loop normally.
it still looks to me that your loop only is for accepting new connections and still only reads a connection ONCE then exits...
I generally don't have a need for a fork() and use select() in the main loop. You can use select() in your child too. It'll sleep until something is available to read.
will there be any unexpected results on looping connect call for a non blocking socket to determine the connection based on error code. I am getting connection unsuccessful intermittently and so wondering whether is the timeout 500 millisec not sufficient or looping connect cause any unexpected.
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