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Manual page for STATFS(2)

statfs, fstatfs - get file system statistics

SYNOPSIS

#include <sys/vfs.h>

int statfs(path, buf)
char *path;
struct statfs *buf;

int fstatfs(fd, buf)
int fd;
struct statfs *buf;

DESCRIPTION

statfs() returns information about a mounted file system. path is the path name of any file within the mounted filesystem. buf is a pointer to a statfs() structure defined as follows:

typedef struct {
	long	val[2];
} fsid_t;
struct statfs {
	long	f_type; 	/* type of info, zero for now */
	long	f_bsize;	/* fundamental file system block size */
	long	f_blocks;	/* total blocks in file system */
	long	f_bfree;	/* free blocks */
	long	f_bavail;	/* free blocks available to non-super-user */
	long	f_files;	/* total file nodes in file system */
	long	f_ffree;	/* free file nodes in fs */
	fsid_t	f_fsid; 	/* file system id */
	long	f_spare[7];	/* spare for later */
};

Fields that are undefined for a particular file system are set to -1. fstatfs() returns the same information about an open file referenced by descriptor fd.

RETURN VALUES

statfs() and fstatfs() return:

0: on success.
-1: on failure and set errno to indicate the error.

ERRORS

statfs() fails if one or more of the following are true:

EACCES: Search permission is denied for a component of the path prefix of path.
EFAULT: buf or path points to an invalid address.
EIO: An I/O error occurred while reading from or writing to the file system.
ELOOP: Too many symbolic links were encountered in translating path.
ENAMETOOLONG: The length of the path argument exceeds {PATH_MAX}.
: A pathname component is longer than {NAME_MAX} (see sysconf.2v while {_POSIX_NO_TRUNC} is in effect (see pathconf.2v
ENOENT: The file referred to by path does not exist.
ENOTDIR: A component of the path prefix of path is not a directory.

fstatfs() fails if one or more of the following are true:

EBADF: fd is not a valid open file descriptor.
EFAULT: buf points to an invalid address.
EIO: An I/O error occurred while reading from the file system.

BUGS

The NFS revision 2 protocol does not permit the number of free files to be provided to the client; thus, when statfs() or fstatfs() are done on a file on an NFS file system, f_files and f_ffree are always -1.