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1.\" $OpenBSD: statvfs.3,v 1.5 2008/03/26 09:37:59 jmc Exp $
2.\" $NetBSD: statfs.2,v 1.10 1995/06/29 11:40:48 cgd Exp $
144cbe0c 3.\" $DragonFly: src/lib/libc/sys/statvfs.2,v 1.3 2008/09/30 08:28:36 swildner Exp $
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32.\" @(#)statfs.2 8.3 (Berkeley) 2/11/94
33.\"
34.Dd September 28, 2008
35.Dt STATVFS 2
36.Os
37.Sh NAME
38.Nm statvfs ,
39.Nm fstatvfs
40.Nd get file system statistics
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41.Sh LIBRARY
42.Lb libc
b0d702c4 43.Sh SYNOPSIS
144cbe0c 44.In sys/statvfs.h
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45.Ft int
46.Fn statvfs "const char *path" "struct statvfs *buf"
47.Ft int
48.Fn fstatvfs "int fd" "struct statvfs *buf"
49.Sh DESCRIPTION
50.Fn statvfs
51returns information about a mounted file system.
52.Fa path
53is the path name of any file within the mounted file system.
54.Fa buf
55is a pointer to a
56.Nm statvfs
57structure defined as follows:
58.Bd -literal
59struct statvfs {
60 unsigned long f_bsize; /* file system block size */
61 unsigned long f_frsize; /* fundamental file system block size */
62 fsblkcnt_t f_blocks; /* number of blocks (unit f_frsize) */
63 fsblkcnt_t f_bfree; /* free blocks in file system */
64 fsblkcnt_t f_bavail; /* free blocks for non-root */
65 fsfilcnt_t f_files; /* total file inodes */
66 fsfilcnt_t f_ffree; /* free file inodes */
67 fsfilcnt_t f_favail; /* free file inodes for to non-root */
68 unsigned long f_fsid; /* file system id */
69 unsigned long f_flag; /* bit mask of f_flag values */
70 unsigned long f_namemax; /* maximum filename length */
71 uid_t f_owner; /* user that mounted the filesystem */
72 unsigned int f_type; /* filesystem type */
73
74 uint64_t f_syncreads; /* count of sync reads since mount */
75 uint64_t f_syncwrites; /* count of sync writes since mount */
76
77 uint64_t f_asyncreads; /* count of async reads since mount */
78 uint64_t f_asyncwrites; /* count of async writes since mount */
79
80 /*
81 * DragonFly extensions - full uuid FSID and owner
82 */
83 uuid_t f_fsid_uuid;
84 uuid_t f_uid_uuid;
85};
86
87/*
88 * f_flag definitions
89 */
90#define ST_RDONLY 0x00000001 /* fs is read-only */
91#define ST_NOSUID 0x00000002 /* ST_ISUID or ST_ISGID not supported */
92
93/*
94 * DragonFly specific flags
95 */
96#define ST_FSID_UUID 0x40000000 /* f_fsid_uuid field is valid */
97#define ST_OWNER_UUID 0x80000000 /* f_owner_uuid field is valid */
98.Ed
99.Pp
100The fields of type
101.Va fsblkcnt_t
102are reported in units of
103.Va f_frsize .
104.Pp
105.Fn fstatvfs
106returns the same information about an open file referenced by descriptor
107.Fa fd .
108.Sh RETURN VALUES
109.Rv -std statvfs fstatvfs
110.Sh ERRORS
111.Fn statvfs
112fails if one or more of the following are true:
113.Bl -tag -width Er
114.It Bq Er ENOTDIR
115A component of the path prefix of
116.Fa path
117is not a directory.
118.It Bq Er ENAMETOOLONG
119The length of a component of
120.Fa path
121exceeds
122.Dv {NAME_MAX}
123characters, or the length of
124.Fa path
125exceeds
126.Dv {PATH_MAX}
127characters.
128.It Bq Er ENOENT
129The file referred to by
130.Fa path
131does not exist.
132.It Bq Er EACCES
133Search permission is denied for a component of the path prefix of
134.Fa path .
135.It Bq Er ELOOP
136Too many symbolic links were encountered in translating
137.Fa path .
138.It Bq Er EFAULT
139.Fa buf
140or
141.Fa path
142points to an invalid address.
143.It Bq Er EIO
144An
145.Tn I/O
146error occurred while reading from or writing to the file system.
147.El
148.Pp
149.Fn fstatvfs
150fails if one or more of the following are true:
151.Bl -tag -width Er
152.It Bq Er EBADF
153.Fa fd
154is not a valid open file descriptor.
155.It Bq Er EFAULT
156.Fa buf
157points to an invalid address.
158.It Bq Er EIO
159An
160.Tn I/O
161error occurred while reading from or writing to the file system.
162.El
163.Sh SEE ALSO
164.Xr df 1 ,
165.Xr mount 2 ,
166.Xr stat 2 ,
167.Xr statfs 2
168.Sh STANDARDS
169The
170.Fn statvfs
171and
172.Fn fstatvfs
173system calls conform to
174.St -p1003.1-2001 .
175.Sh HISTORY
176The
177.Fn statvfs
178and
179.Fn fstatvfs
180functions first appeared in
181.Dx 1.13 .