Linux Debugging Interview Question:

What is the output of this program no 9?
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>

int main()
{
struct sockaddr_in addr;
int fd;
fd = socket(AF_INET,SOCK_STREAM,0);
printf("%dn",fd);
return 0;
}
a) -1
b) 3
c) error
d) none of the mentioned

Submitted by: Murtaza

c) error
Explanation:
The header file netinet/in.h is required to use the structure sockaddr_in.
Output:
[root@localhost google]# gcc -o san san.c
san.c: In function 'main':
san.c:7:21: error: storage size of 'addr' isn't known
[root@localhost google]#
Submitted by: Murtaza