Linux MCQ Questions & Answers | Computer Science

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
 
struct data_st{
    long int id;
    char buff[11];
};
int main()
{
    int m_id,ret;
    struct data_st data1, data2;
    m_id = msgget((key_t)181,0666|IPC_CREAT);
    if(m_id == -1)
        perror("msgget");
    data1.id = 1;
    strcpy(data1.buff,"Example");
    if(msgsnd(m_id,&data1,11,0) == -1)
        perror("msgsnd");
    ret = msgrcv(m_id,&data2,11,1,0);
    printf("%d\n",ret);     
    if(msgctl(m_id,IPC_RMID,0) != 0)
        perror("msgctl");
    return 0;
}

int main() 
{     
	fork();       
	fork();        
	fork();       
	if (wait(0) == -1)          
	printf("leaf child\n");  
}

#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,"Hello\n",6);
    return 0;
}