'\" te
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.TH STATVFS 2 "Oct 3, 2020"
.SH NAME
statvfs, fstatvfs \- get file system information
.SH SYNOPSIS
.nf
#include <sys/types.h>
#include <sys/statvfs.h>
\fBint\fR \fBstatvfs\fR(\fBconst char *restrict\fR \fIpath\fR, \fBstruct statvfs *restrict\fR \fIbuf\fR);
.fi
.LP
.nf
\fBint\fR \fBfstatvfs\fR(\fBint\fR \fIfildes\fR, \fBstruct statvfs *\fR\fIbuf\fR);
.fi
.SH DESCRIPTION
The \fBstatvfs()\fR function returns a "generic superblock" describing a file
system; it can be used to acquire information about mounted file systems. The
\fIbuf\fR argument is a pointer to a structure (described below) that is filled
by the function.
.sp
.LP
The \fIpath\fR argument should name a file that resides on that file system.
The file system type is known to the operating system. Read, write, or execute
permission for the named file is not required, but all directories listed in
the path name leading to the file must be searchable.
.sp
.LP
The \fBstatvfs\fR structure pointed to by \fIbuf\fR includes the following
members:
.sp
.in +2
.nf
u_long f_bsize; /* preferred file system block size */
u_long f_frsize; /* fundamental filesystem block
(size if supported) */
fsblkcnt_t f_blocks; /* total # of blocks on file system
in units of f_frsize */
fsblkcnt_t f_bfree; /* total # of free blocks */
fsblkcnt_t f_bavail; /* # of free blocks avail to
non-privileged user */
fsfilcnt_t f_files; /* total # of file nodes (inodes) */
fsfilcnt_t f_ffree; /* total # of free file nodes */
fsfilcnt_t f_favail; /* # of inodes avail to
non-privileged user*/
u_long f_fsid; /* file system id (dev for now) */
char f_basetype[FSTYPSZ]; /* target fs type name,
null-terminated */
u_long f_flag; /* bit mask of flags */
u_long f_namemax; /* maximum file name length */
char f_fstr[32]; /* file system specific string */
u_long f_filler[16]; /* reserved for future expansion */
.fi
.in -2
.sp
.LP
The \fBf_basetype\fR member contains a null-terminated FSType name of the
mounted target.
.sp
.LP
The following values can be returned in the \fBf_flag\fR field:
.sp
.in +2
.nf
ST_RDONLY 0x01 /* read-only file system */
ST_NOSUID 0x02 /* does not support setuid/setgid semantics */
ST_NOTRUNC 0x04 /* does not truncate file names longer than
NAME_MAX */
.fi
.in -2
.sp
.LP
The \fBfstatvfs()\fR function is similar to \fBstatvfs()\fR, except that the
file named by \fIpath\fR in \fBstatvfs()\fR is instead identified by an open
file descriptor \fIfildes\fR obtained from a successful \fBopen\fR(2),
\fBcreat\fR(2), \fBdup\fR(2), \fBfcntl\fR(2), or \fBpipe\fR(2) function call.
.SH RETURN VALUES
Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is
returned and \fBerrno\fR is set to indicate the error.
.SH ERRORS
The \fBstatvfs()\fR and \fBfstatvfs()\fR functions will fail if:
.sp
.ne 2
.na
\fB\fBEOVERFLOW\fR\fR
.ad
.RS 13n
One of the values to be returned cannot be represented correctly in the
structure pointed to by \fIbuf\fR.
.RE
.sp
.LP
The \fBstatvfs()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEACCES\fR\fR
.ad
.RS 16n
Search permission is denied on a component of the path prefix.
.RE
.sp
.ne 2
.na
\fB\fBEFAULT\fR\fR
.ad
.RS 16n
The \fIpath\fR or \fIbuf\fR argument points to an illegal address.
.RE
.sp
.ne 2
.na
\fB\fBEINTR\fR\fR
.ad
.RS 16n
A signal was caught during the execution of the \fBstatvfs()\fR function.
.RE
.sp
.ne 2
.na
\fB\fBEIO\fR\fR
.ad
.RS 16n
An I/O error occurred while reading the file system.
.RE
.sp
.ne 2
.na
\fB\fBELOOP\fR\fR
.ad
.RS 16n
Too many symbolic links were encountered in translating \fIpath\fR.
.RE
.sp
.ne 2
.na
\fB\fBENAMETOOLONG\fR\fR
.ad
.RS 16n
The length of a \fIpath\fR component exceeds \fBNAME_MAX\fR characters, or the
length of \fIpath\fR exceeds \fBPATH_MAX\fR characters.
.RE
.sp
.ne 2
.na
\fB\fBENOENT\fR\fR
.ad
.RS 16n
Either a component of the path prefix or the file referred to by \fIpath\fR
does not exist.
.RE
.sp
.ne 2
.na
\fB\fBENOLINK\fR\fR
.ad
.RS 16n
The \fIpath\fR argument points to a remote machine and the link to that machine
is no longer active.
.RE
.sp
.ne 2
.na
\fB\fBENOTDIR\fR\fR
.ad
.RS 16n
A component of the path prefix of \fIpath\fR is not a directory.
.RE
.sp
.LP
The \fBfstatvfs()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
The \fIfildes\fR argument is not an open file descriptor.
.RE
.sp
.ne 2
.na
\fB\fBEFAULT\fR\fR
.ad
.RS 10n
The \fIbuf\fR argument points to an illegal address.
.RE
.sp
.ne 2
.na
\fB\fBEINTR\fR\fR
.ad
.RS 10n
A signal was caught during the execution of the \fBfstatvfs()\fR function.
.RE
.sp
.ne 2
.na
\fB\fBEIO\fR\fR
.ad
.RS 10n
An I/O error occurred while reading the file system.
.RE
.SH USAGE
The \fBstatvfs()\fR and \fBfstatvfs()\fR functions have transitional interfaces
for 64-bit file offsets. See \fBlf64\fR(7).
.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Standard
.TE
.SH SEE ALSO
.BR chmod (2),
.BR chown (2),
.BR creat (2),
.BR dup (2),
.BR fcntl (2),
.BR link (2),
.BR mknod (2),
.BR open (2),
.BR pipe (2),
.BR read (2),
.BR time (2),
.BR unlink (2),
.BR utime (2),
.BR write (2),
.BR attributes (7),
.BR lf64 (7),
.BR standards (7)
.SH BUGS
The values returned for \fBf_files\fR, \fBf_ffree\fR, and \fBf_favail\fR may
not be valid for \fBNFS\fR mounted file systems.