Linux Debugging Interview Question:

What is the output of this program no 10?
#include<stdio.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>

int main()
{
int fd_server, fd_client, len, len_client;
struct sockaddr_in add_server;
fd_server = socket(AF_INET,SOCK_STREAM,0);
fd_client = accept(fd_server,(struct sockaddr*)&add_server,&len);
if(fd_client == -1)
perror("accept");
if(listen(fd_server,5) != 0)
perror("listen");
return 0;
}
a) syntax error
b) error at the time of compilation
c) segmentation fault
d) none of the mentioned

Submitted by: Murtaza

d) none of the mentioned
Explanation:
The listen() must always be used before accept().
Output:
[root@localhost google]# gcc -o san san.c
[root@localhost google]# ./san
accept: Invalid argument
[root@localhost google]#
Submitted by: Murtaza