STATVFS(2) BSD System Calls Manual STATVFS(2)NAME
statvfs, fstatvfs — get file system statistics
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/statvfs.h>
int
statvfs(const char *path, struct statvfs *buf);
int
fstatvfs(int fd, struct statvfs *buf);
DESCRIPTIONstatvfs() returns information about a mounted file system. path is the
path name of any file within the mounted file system. buf is a pointer
to a statvfs structure defined as follows:
struct statvfs {
unsigned long f_bsize; /* file system block size */
unsigned long f_frsize; /* fundamental file system block size */
fsblkcnt_t f_blocks; /* number of blocks (unit f_frsize) */
fsblkcnt_t f_bfree; /* free blocks in file system */
fsblkcnt_t f_bavail; /* free blocks for non-root */
fsfilcnt_t f_files; /* total file inodes */
fsfilcnt_t f_ffree; /* free file inodes */
fsfilcnt_t f_favail; /* free file inodes for to non-root */
unsigned long f_fsid; /* file system id */
unsigned long f_flag; /* bit mask of f_flag values */
unsigned long f_namemax; /* maximum filename length */
uid_t f_owner; /* user that mounted the filesystem */
unsigned int f_type; /* filesystem type */
uint64_t f_syncreads; /* count of sync reads since mount */
uint64_t f_syncwrites; /* count of sync writes since mount */
uint64_t f_asyncreads; /* count of async reads since mount */
uint64_t f_asyncwrites; /* count of async writes since mount */
/*
* DragonFly extensions - full uuid FSID and owner
*/
uuid_t f_fsid_uuid;
uuid_t f_uid_uuid;
};
/*
* f_flag definitions
*/
#define ST_RDONLY 0x00000001 /* fs is read-only */
#define ST_NOSUID 0x00000002 /* ST_ISUID or ST_ISGID not supported */
/*
* DragonFly specific flags
*/
#define ST_FSID_UUID 0x40000000 /* f_fsid_uuid field is valid */
#define ST_OWNER_UUID 0x80000000 /* f_owner_uuid field is valid */
The fields of type fsblkcnt_t are reported in units of f_frsize.
fstatvfs() returns the same information about an open file referenced by
descriptor fd.
RETURN VALUES
The statvfs() and fstatvfs() functions return the value 0 if successful;
otherwise the value -1 is returned and the global variable errno is set
to indicate the error.
ERRORSstatvfs() fails if one or more of the following are true:
[ENOTDIR] A component of the path prefix of path is not a direc‐
tory.
[ENAMETOOLONG] The length of a component of path exceeds {NAME_MAX}
characters, or the length of path exceeds {PATH_MAX}
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 translat‐
ing 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.
fstatvfs() 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 or writing to
the file system.
SEE ALSOdf(1), mount(2), stat(2), statfs(2)STANDARDS
The statvfs() and fstatvfs() system calls conform to IEEE Std 1003.1-2001
(“POSIX.1”).
HISTORY
The statvfs() and fstatvfs() functions first appeared in DragonFly 1.13.
BSD September 28, 2008 BSD
