get disk usage

[rubenqba]

Hi:

Somebody knows how I can obtain disk space usage and the space that left in disk.

[tyreld]

On a POSIX system you would use the file system statistics data type and function calls. These are defined in <sys/statvfs.h>.

Here is what the data structure and funtion prototypes should look like in <sys/statvfs.h>

struct statvfs {unsigned long  f_bsize;    /* file system block size */
unsigned long  f_frsize;   /* fragment size */
fsblkcnt_t     f_blocks;   /* size of fs in f_frsize units */
fsblkcnt_t     f_bfree;    /* # free blocks */
fsblkcnt_t     f_bavail;   /* # free blocks for non-root */
fsfilcnt_t     f_files;    /* # inodes */
fsfilcnt_t     f_ffree;    /* # free inodes */
fsfilcnt_t     f_favail;   /* # free inodes for non-root */
unsigned long  f_fsid;     /* file system ID */
unsigned long  f_flag;     /* mount flags */
unsigned long  f_namemax;  /* maximum filename length */};
 
/* These functions return 0 on success and -1 on failure */
 
int statvfs(const char *filename, struct statvfs buf);
int fstatvfs(int fd, struct statvfs buf);
 

This sample code outputs the disk usage and free space in bytes.

include <sys/statvfs.h>
 
...
 
/* Any file on the filesystem in question */
char *filename = "/home/tyreld/somefile.txt";
 
struct statvfs buf;
if (!statvfs(filename, &buf)) {unsigned long blksize, blocks, freeblks, disk_size, used, free;
 
blksize = buf.f_bsize;
blocks = buf.f_blocks;
freeblks = buf.f_bfree;
 
disk_size = blocks * blksize;
free = freeblks * blksize;
used = disk_size - free;
 
printf("Disk usage : %lu \t Free space %lu\n", used, free);} else {printf("Couldn't get file system statistics\n");}
 
 

[naveenese]

Thanks tyreld

Good post..Aftr searching long time got this post..
I have used it as part of my code.