NAME
statfs
, fstatfs
— get file system
statistics
SYNOPSIS
#include
<sys/param.h>
#include <sys/mount.h>
int
statfs
(const
char *path, struct statfs
*buf);
int
fstatfs
(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 file system.
buf is a pointer to a statfs
structure defined as follows:
typedef struct { int32_t val[2]; } fsid_t; #define MFSNAMELEN 16 /* length of fs type name, including nul */ #define MNAMELEN 90 /* length of buffer for returned name */ struct statfs { u_int32_t f_flags; /* copy of mount flags */ u_int32_t f_bsize; /* file system block size */ u_int32_t f_iosize; /* optimal transfer block size */ /* unit is f_bsize */ u_int64_t f_blocks; /* total data blocks in file system */ u_int64_t f_bfree; /* free blocks in fs */ int64_t f_bavail; /* free blocks avail to non-superuser */ u_int64_t f_files; /* total file nodes in file system */ u_int64_t f_ffree; /* free file nodes in fs */ int64_t f_favail; /* free file nodes avail to non-root */ u_int64_t f_syncwrites; /* count of sync writes since mount */ u_int64_t f_syncreads; /* count of sync reads since mount */ u_int64_t f_asyncwrites; /* count of async writes since mount */ u_int64_t f_asyncreads; /* count of async reads since mount */ fsid_t f_fsid; /* file system id */ u_int32_t f_namemax; /* maximum filename length */ uid_t f_owner; /* user that mounted the file system */ u_int32_t f_ctime; /* last mount [-u] time */ u_int32_t f_spare[3]; /* spare for later */ char f_fstypename[MFSNAMELEN]; /* fs type name */ char f_mntonname[MNAMELEN]; /* directory on which mounted */ char f_mntfromname[MNAMELEN]; /* mounted file system */ union mount_info mount_info; /* per-filesystem mount options */ };
fstatfs
()
returns the same information about an open file referenced by descriptor
fd.
Note that f_fsid will be empty unless the user is the superuser.
RETURN VALUES
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.
- [
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 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 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 ALSO
HISTORY
The statfs
() function first appeared in
4.4BSD.