A simple way to obtain the total disk space in Linux

In the embedded Linux system, the method for obtaining the total disk space is generally used in the same way as busybox.

Function: setmntent, getmntent, endmntent

The following describes how to directly read/proc/files and obtain the total disk space:

Static double get_disk_totoal_size ()
{
# Define disk_sector_file "/proc/IDE/hda/capacity"

Double dtotalsize =-1.0;
File * fp = fopen (disk_sector_file, "R ");
If (FP)
{
Char * P;
Char szbuf [256] = {0 };
If (fgets (szbuf, 256, FP ))
{
Dtotalsize = atof (szbuf); // total sectors
Dtotalsize * = 512; // Total Bytes
}
Fclose (FP );
}
Return dtotalsize;
}