⟩ Why LVM is required in Linux?
LVM stands for Logical Volume Manager, to re-size filesystem's size online we required LVM partition in Linux. Size of LVM partition can be extended and reduced using the lvextend & lvreduce commands respectively.
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More Questions for you:
On which system call, this program (process) waits until the server responds?
#include<stdio.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
int main()
{
int fd_client,fd, len;
struct sockaddr_in add_server;
fd_client = socket(AF_INET,SOCK_STREAM,0);
if (fd_client == -1){
perror("fd_sock");
exit(1);
}
add_server.sin_family = AF_INET;
add_server.sin_port = ntohs(4001);
add_server.sin_addr.s_addr = inet_addr("127.0.0.1");
len = sizeof(add_server);
fd = connect(fd_client,(struct sockaddr*)&add_server,len);
if(fd == -1)
perror("connect");
write(fd,"Hellon",6);
return 0;
}
a) socket()
b) connect()
c) both (a) and (b)
d) none of the mentionedWhat is the the response of this server for this client if both programs are running on the same system?
/*This is server.c*/
#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, add_client;
char buff[10];
fd_server = socket(AF_INET,SOCK_STREAM,0);
if (fd_server == -1){
perror("fd_sock");
exit(1);
}
add_server.sin_family = AF_INET;
add_server.sin_port = htons(4001);
add_server.sin_addr.s_addr = inet_addr("127.0.0.1");
len = sizeof(add_server);
len = sizeof(add_client);
if( bind(fd_server,(struct sockaddr*)&add_server,len) != 0)
perror("bind");
if(listen(fd_server,5) != 0)
perror("listen");
fd_client = accept(fd_server,(struct sockaddr*)&add_client,&len_client);
if(fd_client == -1)
perror("accept");
read(fd_clWhat is the output of this program no 12?
#include<stdio.h>
int main()
{
int fd_socket;
fd_socket = socket(AF_UNIX,SOCK_STREAM,0);
printf("%dn",fd_socket);
return 0;
}
a) -1
b) 0
c) any integer value
d) none of the mentionedIn this program, the third argument of the socket() is used for _____ potocol.
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
int main()
{
int fd_socket;
if(socket(AF_UNIX,SOCK_STREAM,0) == -1)
perror("socket");
return 0;
}
a) TCP/IP
b) UDP
c) both (a) and (b)
d) none of mentionedBy this program the soket "san_sock" will create
#include<stdio.h>
#include<sys/types.h>
#include<sys/un.h>
#include<sys/socket.h>
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 the mentionedWhat is the length of of the queue for pending connections in this program?
#include<stdio.h>
#include<sys/types.h>
#include<sys/un.h>
#include<sys/socket.h>
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) 3What is the output of the program no 13?
#include<stdio.h>
#include<sys/types.h>
#include<sys/un.h>
#include<sys/socket.h>
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("googlen");
return 0;
}
a) the program will print the string "google"
b) the process will remain block
c) segmentation fault
d) none of the mentionedWhat is the output of this program?
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
int main()
{
int fd;
fd = socket(AF_UNIX,SOCK_STREAM,0);
printf("%dn",fd);
return 0;
}
a) 0
b) 1
c) 2
d) 3What is the output of this program no 14?
#include<stdio.h>
#include<sys/types.h>
#include<sys/un.h>
#include<sys/socket.h>
#include<errno.h>
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("Sanfoudnryn");
return 0;
}
a) this program will print the string "google"
b) this program will not print the string "google"
c) segmentation fault
d) none of the mentionedWhat this program is not able to connect with any client program?
#include<stdio.h>
#include<sys/types.h>
#include<sys/un.h>
#include<sys/socket.h>
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("googlen");
return 0;
}
a) the listen() is missing
b) the connect() is missing
c) the read() and write() are missing
d) none of the mentioned
