fstatvfs(), fstatvfs64()

#include <sys/statvfs.h>

int fstatvfs( int fildes, 
              struct statvfs *buf );

int fstatvfs64( int fildes,
                struct statvfs64 *buf );

Since:

BlackBerry 10.0.0

Arguments:

fildes

The descriptor for a file that resides on the filesystem that you want to get information about.

buf

A pointer to a buffer where the function can store information about the filesystem; see below.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The fstatvfs() and fstatvfs64() functions return a "generic superblock" describing a filesystem that you can use to get information about mounted filesystems. The fstatvfs64() function is a 64-bit version of fstatvfs(). The statvfs() and statvfs64() functions are similar, but they take a path name instead of a file descriptor.

The fildes argument is an open file descriptor, obtained from a successful call to open() , creat() , dup() , fcntl() , or pipe() , for a file that resides on that filesystem. The filesystem type is known to the operating system. Read, write, or execute permission for the named file isn't required.

The buf argument is a pointer to a statvfs or statvfs64 structure that's filled by the function. It contains at least:

unsigned long f_bsize

The preferred filesystem blocksize.

unsigned long f_frsize

The fundamental filesystem blocksize (if supported)

fsblkcnt_t f_blocks

The total number of blocks on the filesystem, in units of f_frsize.

fsblkcnt_t f_bfree

The total number of free blocks.

fsblkcnt_t f_bavail

The number of free blocks available to a nonsuperuser.

fsfilcnt_t f_files

The total number of file nodes (inodes).

fsfilcnt_t f_ffree

The total number of free file nodes.

fsfilcnt_t f_favail

The number of inodes available to a nonsuperuser.

unsigned long f_fsid

The filesystem ID (currently the device ID).

char f_basetype[16]

The type of the target filesystem, as a null-terminated string.

unsigned long f_flag

A bitmask of flags; the function can set these flags (the _MOUNT_* and ST_* bits are equivalent):

_MOUNT_*	ST_*	Meaning
_MOUNT_READONLY	ST_RDONLY	The filesystem is read-only.
_MOUNT_NOEXEC	ST_NOEXEC	The filesystem doesn't permit the loading of executables.
_MOUNT_NOSUID	ST_NOSUID	The filesystem doesn't support setuid() and setgid() semantics.
_MOUNT_NOCREAT	ST_NOCREAT	You can't create files on the filesystem.
_MOUNT_OFF32	ST_OFF32	The off_t type is limited to 32 bits.
_MOUNT_NOATIME	ST_NOATIME	The filesystem doesn't support the logging of file access times.

unsigned long f_namemax

The maximum filename length.

The values returned for f_files, f_ffree, and f_favail depend on the filesystem:

fs-qnx6.so

These filesystems have a fixed inodes table, so they fill in these fields.

devf-*

Flash filesystem drivers estimate the values of these fields, based on the amount of free space.

Returns:

0

Success.

-1

An error occurred ( errno is set).

Errors:

EBADF

The fildes argument isn't an open file descriptor.

EFAULT

The buf argument points to an illegal address.

EINTR

A signal was caught during execution.

EIO

An I/O error occurred while reading the filesystem.

EOVERFLOW

One of the values to be returned can't be represented correctly in the structure pointed to by buf.

Classification:

fstatvfs() is POSIX 1003.1 XSI; fstatvfs64() is Large-file support