NAME

std::experimental::filesystem::space - std::experimental::filesystem::space

Synopsis

Defined in header <experimental/filesystem>
space_info space(const path& p); (filesystem TS)
space_info space(const path& p, error_code& ec) noexcept;

Determines the information about the filesystem on which the pathname p is located,
as if by POSIX statvfs

Populates and returns an object of type space_info, set from the members of the
POSIX struct statvfs as follows

* space_info.capacity is set as if by f_blocks*f_frsize
* space_info.free is set to f_bfree*f_frsize
* space_info.available is set to f_bavail*f_frsize
* Any member that could not be determined is set to static_cast<uintmax_t>(-1)

The non-throwing overload sets all members to static_cast<uintmax_t>(-1) on error.

Parameters

p - path to examine
ec - out-parameter for error reporting in the non-throwing overload

Return value

The filesystem information (a space_info object)

Exceptions

The overload that does not take a error_code& parameter throws filesystem_error on
underlying OS API errors, constructed with p as the first argument and the OS error
code as the error code argument. std::bad_alloc may be thrown if memory allocation
fails. The overload taking a error_code& parameter sets it to the OS API error code
if an OS API call fails, and executes ec.clear() if no errors occur. This overload
has
noexcept specification:
noexcept

Notes

space_info.available may be less than space_info.free

Example

// Run this code

#include <iostream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
int main()
{
fs::space_info devi = fs::space("/dev/null");
fs::space_info tmpi = fs::space("/tmp");

std::cout << ". Capacity Free Available\n"
<< "/dev: " << devi.capacity << " "
<< devi.free << " " << devi.available << '\n'
<< "/tmp: " << tmpi.capacity << " "
<< tmpi.free << " " << tmpi.available << '\n';
}

Possible output:

. Capacity Free Available
/dev: 4175114240 4175110144 4175110144
/tmp: 420651237376 411962273792 390570749952