I used your code & it works like a charm. I organized the code into simple separate functions as shown below.
Code:
#include <sys/types.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <cstdio>
#include <iostream>
#define DISK_NAME "/dev/loop0"
using namespace std;
/**
Read a set of Blocks into the Buffer
Block_SIZE=512bytes
*/
int readFromDisk(char *buffer,int length)
{
ssize_t readBytes;
int fd=open(DISK_NAME, O_RDWR);
if(fd < 0)
{
perror("Couldn't open device");
return 1;
}
readBytes=read(fd, buffer, length);
cout<<"Read Bytes : "<<(int)readBytes<<endl;
close(fd);
return 0;
}
/**
Write the Buffer Content to HDD
Block_SIZE=512bytes
*/
int writeToDisk(char *buffer,int length)
{
ssize_t writeBytes;
int fd=open(DISK_NAME, O_RDWR);
writeBytes=write(fd,buffer,length);
cout<<"Wrote Bytes : "<<(int)writeBytes<<endl;
close(fd);
return 0;
}
/**
Seek out a Particular Block In the Disk
Block_SIZE=512bytes
*/
int seekDisk()
{
cout<<"Seeking the File Disk..."<<endl;
int fd=open(DISK_NAME, O_RDWR);
if(lseek(fd, 0L, SEEK_SET) != 0L)
{
perror("Couldn't seek");
close(fd);
return(1);
}
close(fd);
return 0;
}
int main(void)
{
cout<<"\n"<<"Running the OS File Manager....Main"<<endl;
/*
Test The File Manager
*/
char buffer[1024];
readFromDisk(buffer,512);
seekDisk();
writeToDisk(buffer,300);
return 0;
}
Now I'm having trouble figuring out a way to create a file using the above code. Could you please help me out here by giving me a point to start on working please ?.
---------- Post updated at 06:54 AM ---------- Previous update was at 01:41 AM ----------
Could Anyone Please Help me with this ?. I need to use the following code I've come up so far & figure out a way to create a file inside the block device. Following is my code.
Code:
#include <sys/types.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <cstdio>
#include <iostream>
#define DISK_NAME "/dev/loop0"
using namespace std;
/**
Read a set of Blocks into the Buffer
Block_SIZE=512bytes
*/
int readFromDisk(char *buffer,int length)
{
ssize_t readBytes;
int fd=open(DISK_NAME, O_RDWR);
if(fd < 0)
{
perror("Couldn't open device");
return 1;
}
readBytes=read(fd, buffer, length);
cout<<"Read Bytes : "<<(int)readBytes<<endl;
close(fd);
return 0;
}
/**
Write the Buffer Content to HDD
Block_SIZE=512bytes
*/
int writeToDisk(char *buffer,int length)
{
ssize_t writeBytes;
int fd=open(DISK_NAME, O_RDWR);
writeBytes=write(fd,buffer,length);
cout<<"Wrote Bytes : "<<(int)writeBytes<<endl;
close(fd);
return 0;
}
/**
Seek out a Particular Block In the Disk
Block_SIZE=512bytes
*/
int seekDisk()
{
cout<<"Seeking the File Disk..."<<endl;
int fd=open(DISK_NAME, O_RDWR);
if(lseek(fd, 0L, SEEK_SET) != 0L)
{
perror("Couldn't seek");
close(fd);
return(1);
}
close(fd);
return 0;
}
int main(void)
{
cout<<"\n"<<"Running the OS File Manager....Main"<<endl;
/*
Test The File Manager
*/
char buffer[1024];
readFromDisk(buffer,512);
seekDisk();
writeToDisk(buffer,300);
return 0;
}
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