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Manual page for STATFS(2)

statfs - get file system statistics

SYNOPSIS

#include <sys/vfs.h>

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

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-superuser */
	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 VALUE

Upon successful completion, a value of 0 is returned. Otherwise, -1 is returned and the global variable errno is set to indicate the error.

ERRORS

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

ENOTDIR: A component of the path prefix of path is not a directory.
EINVAL: path contains a character with the high-order bit set.
ENAMETOOLONG: The length of a component of path exceeds 255 characters, or the length of path exceeds 1023 characters.
ENOENT: The file referred to by path does not exist.
EACCES: Search permission is denied for a component of the path prefix of path.
ELOOP: Too many symbolic links were encountered in translating 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.

fstatfs fails if one or both 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 or writing to the file system.