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Q501

Linux filesystem contains mainly

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Q502

Race condition can be avoided by using

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Q503

Shell is ?

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Q504

Which system call is used to create Sys V message Queue.

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Q505

Binary or executable files are:

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Q506

Which variable contains current shell process id

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Q507

Proc filesystem does not contains

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Q508

What is the output of this program?

#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;
}

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Q509

What is output of the following program?

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

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Q510

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

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Q511

What is the output of the program?

#! /usr/bin/awk -f
BEGIN {
    a[1,1]=0
    a[1,2]=1
    a[2,1]=2
    a[2,2]=3
    for(i=1;i<3;i++) {
        for(j=1;j<3;j++) {
        print a[i,j]
        }
    }
}

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Q512

The file system information is stored in

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Q513

Mm_struct maintains?

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Q514

SVR4 stands for?

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Q515

Which command is used to print a file

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Q516

Which of the following signal cannot be handled or ignored?

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Q517

What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<sys/mman.h>
 
int main()
{
    int s_id;
    s_id = shm_open("shared_mem",O_CREAT|O_RDWR,0666);
    printf("%d\n",s_id);
    if(shm_unlink("shared_mem") == -1)
        perror("shm_unlink");
    return 0;
}

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Q518

/bin/dmesg picks the messages from

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Q519

Which one of the following is bitwise 'exclusive or' operator?

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Q520

For a shared library, version number is changed when

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