Basic Computer Knowledge Test Questions and Answers

Linux Debugging Questions & Answers – Unix Domain Sockets

Basic Computer Knowledge Test Questions and Answers

1.

What is the output of this program?

   #include
 
   int main()
   {
       int fd_socket;
       fd_socket = socket(AF_UNIX,SOCK_STREAM,0);
       printf("%d\n",fd_socket);
       return 0;
   }

   A.) -1
   B.) 0
   C.) any integer value
   D.) none of these

Answer: Option 'D'

To use socket(), the header files sys/types.h and sys/socket.h are required.
Output:
[root@localhost sanfoundry]# gcc -o san san.c
san.c: In function ‘main’:
san.c:6:21: error: ‘AF_UNIX’ undeclared (first use in this function)
san.c:6:21: note: each undeclared identifier is reported only once for each function it appears in
san.c:6:29: error: ‘SOCK_STREAM’ undeclared (first use in this function)
[root@localhost sanfoundry]#

Basic Computer Knowledge Test Questions and Answers

2.

In this program, the third argument of the socket() is used for _____ potocol.


   #include
   #include
   #include
   int main()
   {
       int fd_socket;
       if(socket(AF_UNIX,SOCK_STREAM,0) == -1)
           perror("socket");
       return 0;
   }

   A.) TCP/IP
   B.) UDP
   C.) both TCP/IP and UDP
   D.) none of these

Answer: Option 'A'

TCP/IP

Basic Computer Knowledge Test Questions and Answers

3.

By this program the soket “san_sock” will create 

   #include
   #include
   #include
   #include
 
   int main()
   {
       struct sockaddr_un add_server;
       int fd_server;
       fd_server = socket(AF_UNIX,SOCK_STREAM,0);
       if(fd_server == -1)
           perror("socket");
       add_server.sun_family = AF_UNIX;
       strcpy(add_server.sun_path,"san_sock");
       if( bind(fd_server,(struct sockaddr*)&add_server,sizeof(add_server)) != 0)
           perror("bind");
       return 0;
   }

   A.) in the /tmp directory
   B.) in the /usr directory
   C.) in the present working directory
   D.) none of these

Answer: Option 'C'

in the present working directory

Basic Computer Knowledge Test Questions and Answers

4.

What is the length of of the queue for pending connections in this program?


   #include
   #include
   #include
   #include
 
   int main()
   {
       struct sockaddr_un add_server;
       int fd_server;
       fd_server = socket(AF_UNIX,SOCK_STREAM,0);
       if(fd_server == -1)
           perror("socket");
       add_server.sun_family = AF_UNIX;
       strcpy(add_server.sun_path,"server_sock2");
       if( bind(fd_server,(struct sockaddr*)&add_server,sizeof(add_server)) != 0)
           perror("bind");
       if( listen(fd_server,3) != 0)
           perror("listen");
       return 0;
   }

   A.) 0
   B.) 1
   C.) 2
   D.) 3

Answer: Option 'D'

The second argument of listen() specifies the length for the queue for pending connections.

Basic Computer Knowledge Test Questions and Answers

5.

What is the output of the program? 

   #include
   #include
   #include
   #include
 
   int main()
   {
       struct sockaddr_un add_server, add_client;
       int fd_server, fd_client;
       int len;
       char ch;
       fd_server = socket(AF_UNIX,SOCK_STREAM,0);
       if(fd_server == -1)
           perror("socket");
       add_server.sun_family = AF_UNIX;
       strcpy(add_server.sun_path,"san_sock");
       if( bind(fd_server,(struct sockaddr*)&add_server,sizeof(add_server)) != 0)
           perror("bind");
       if( listen(fd_server,3) != 0)
           perror("listen");
       len = sizeof(add_client);
       fd_client = accept(fd_server,(struct sockaddr*)&add_client,&len);
       printf("Sanfoundry\n"); 
       return 0;
   }

   A.) the program will print the string “Sanfoundry”
   B.) the process will remain block
   C.) segmentation fault
   D.) none of these

Answer: Option 'B'

the process will remain block

Basic Computer Knowledge Test Questions and Answers

6.

What is the output of this program? 

   #include
   #include
   #include
 
   int main()
   {
       int fd;
       fd = socket(AF_UNIX,SOCK_STREAM,0);
       printf("%d\n",fd);
       return 0;
   }

   A.) 0
   B.) 1
   C.) 2
   D.) 3

Answer: Option 'D'

The socket() returns the lowest available file descriptor and in this program i.e. 3.
Output:
[root@localhost sanfoundry]# gcc -o san san.c
[root@localhost sanfoundry]# ./san
3
[root@localhost sanfoundry]#

Basic Computer Knowledge Test Questions and Answers

7.

What is the output of this program? 

   #include
   #include
   #include
   #include
   #include
 
   int main()
   {
       struct sockaddr_un addr;
       int fd;
       fd = socket(AF_UNIX,SOCK_STREAM,0);
       if (fd == -1)
           perror("socket");
       addr.sun_family = AF_UNIX;
       strcpy(addr.sun_path,"san_sock");
       if (bind(4,(struct sockaddr*)&addr,sizeof(addr)) == -1)
           printf("Sanfoudnry\n");
       return 0;
   }

   A.) this program will print the string “Sanfoundry”
   B.) this program will not print the string “Sanfoundry”
   C.) segmentation fault
   D.) none of these

Answer: Option 'A'

this program will print the string “Sanfoundry”

Basic Computer Knowledge Test Questions and Answers

8.

What this program is not able to connect with any client program? 

   #include
   #include
   #include
   #include
 
   int main()
   {
       struct sockaddr_un add_server, add_client;
       int fd_server, fd_client;
       int len;
       char ch;
       fd_server = socket(AF_UNIX,SOCK_STREAM,0);
       if(fd_server == -1)
           perror("socket");
       add_server.sun_family = AF_UNIX;
       strcpy(add_server.sun_path,"san_sock");
       if( bind(fd_server,(struct sockaddr*)&add_server,sizeof(add_server)) != 0)
           perror("bind");
       len = sizeof(add_client);
       fd_client = accept(fd_server,(struct sockaddr*)&add_client,&len);
       printf("Sanfoundry\n"); 
       return 0;
   }

   A.) the listen() is missing
   B.) the connect() is missing
   C.) the read() and write() are missing
   D.) none of these

Answer: Option 'A'

the listen() is missing

Basic Computer Knowledge Test Questions and Answers

9.

What is the output of this program?


   #include
   #include
   #include
   #include
 
   int main()
   {
       struct sockaddr_un add_server, add_client;
       int fd_server, fd_client;
       int len;
       char ch;
       fd_server = socket(AF_UNIX,SOCK_STREAM,0);
       if(fd_server == -1)
           perror("socket");
       add_server.sun_family = AF_UNIX;
       strcpy(add_server.sun_path,"san_sock");
       if( bind(fd_server,(struct sockaddr*)&add_server,sizeof(add_server)) != 0)
           perror("bind");
       len = sizeof(add_client);
       fd_client = connect(fd_server,(struct sockaddr*)&add_client,&len);
       printf("Sanfoundry\n"); 
       return 0;
   }

   A.) this program will print the string “Sanfoundry”
   B.) segmentation fault
   C.) error
   D.) none of these

Answer: Option 'C'

error

Basic Computer Knowledge Test Questions and Answers

10.

What is the output of this program?


    #include
    #include
    #include
    #include
    #include
 
    int main()
    {
        struct sockaddr_in addr;
        int fd;
        fd = socket(AF_UNIX,SOCK_STREAM,0);
        if (fd == -1)
            perror("socket");
        addr.sun_family = AF_UNIX;
        strcpy(addr.sun_path,"san_sock");
        if (bind(4,(struct sockaddr*)&addr,sizeof(addr)) == -1)
            printf("Sanfoudnry\n");
        return 0;
    }

   A.) error
   B.) “Sanfoundry”
   C.) segmentation fault
   D.) none of these

Answer: Option 'A'

error

The structure used for AF_UNIX if sockaddr_un.
Output:
[root@localhost sanfoundry]# gcc -o san san.c
san.c: In function ‘main’:
san.c:14:6: error: ‘struct sockaddr_in’ has no member named ‘sun_family’
san.c:15:2: warning: incompatible implicit declaration of built-in function ‘strcpy’ [enabled by default] san.c:15:13: error: ‘struct sockaddr_in’ has no member named ‘sun_path’
[root@localhost sanfoundry]#

Linux Debugging Questions & Answers – Unix Domain Sockets Download Pdf

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