Device Detection

[IWishIKnew]

I need to know if there is a way to detect what block devices are currently available to be mounted, what block devices are currently mounted, and the type of block device (aka: is it a loop device? is it a phisical device (like a HDD/flash drive, etc...?)

I've searched for API documentation, but I could not find any on this particular topic.

I have delved into /sys/dev/block, but I feel like I shouldn't experiment if the API provides a way to gather this information.

[IWishIKnew]

So, I think I may have fiured it out. I was digging around, and found this:

/proc/partitions : has all the block partitions that can be mounted.
/proc/mounts : has all mounted devices, as well as their filesystem (if applicable) and permissions.

Both are updated in real-time.

I can get the size of any device from /sys/dev/block (following major:minor as given in /proc/partitions), but I really need to aqcuire the amoutn of free space available. Is there any better way to do this than calculating the size of used space?

[naraku9333]

Maybe statvfs http://linux.die.net/man/2/statvfs

#include <iostream>
#include <unistd.h>
#include <sys/statvfs.h>
 
int main()
{
        struct statvfs fs;
        statvfs("/", &fs);
 
        std::cout << (fs.f_bavail * 4096) / 1024 / 1024  
        << " MB free" << std::endl;
}

[IWishIKnew]

Thanks naraku9333!