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>
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struct statvfs {
unsigned long f_bsize; /* file system block size */
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unsigned long f_frsize; /* fragment size */
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fsblkcnt_t f_blocks; /* size of fs in f_frsize units */
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fsblkcnt_t f_bfree; /* # free blocks */
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fsblkcnt_t f_bavail; /* # free blocks for non-root */
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fsfilcnt_t f_files; /* # inodes */
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fsfilcnt_t f_ffree; /* # free inodes */
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fsfilcnt_t f_favail; /* # free inodes for non-root */
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unsigned long f_fsid; /* file system ID */
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unsigned long f_flag; /* mount flags */
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unsigned long f_namemax; /* maximum filename length */};
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/* These functions return 0 on success and -1 on failure */
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int statvfs(const char *filename, struct statvfs buf);
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int fstatvfs(int fd, struct statvfs buf);
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This sample code outputs the disk usage and free space in bytes.
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include <sys/statvfs.h>
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...
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/* Any file on the filesystem in question */
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char *filename = "/home/tyreld/somefile.txt";
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struct statvfs buf;
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if (!statvfs(filename, &buf)) {
unsigned long blksize, blocks, freeblks, disk_size, used, free;
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blksize = buf.f_bsize;
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blocks = buf.f_blocks;
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freeblks = buf.f_bfree;
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disk_size = blocks * blksize;
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free = freeblks * blksize;
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used = disk_size - free;
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printf("Disk usage : %lu \t Free space %lu\n", used, free);} else {
printf("Couldn't get file system statistics\n");
} -
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