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.\"     @(#)getmntinfo.3	8.1 (Berkeley) 6/9/93
.\" $FreeBSD: src/lib/libc/gen/getmntinfo.3,v 1.12 2002/12/19 09:40:21 ru Exp $
.\"
.Dd June 9, 1993
.Dt GETMNTINFO 3
.Os
.Sh NAME
.Nm getmntinfo
.Nd get information about mounted file systems
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/param.h
.In sys/ucred.h
.In sys/mount.h
.Ft int
.Fn getmntinfo "struct statfs **mntbufp" "int flags"
.Ft int
.Fn getmntinfo64 "struct statfs64 **mntbufp" "int flags"
.Sh DESCRIPTION
The
.Fn getmntinfo
function
returns an array of
.Ft statfs
structures describing each currently mounted file system (see
.Xr statfs 2 ) .
Likewise, the
.Fn getmntinfo64
function
returns an array of
.Ft statfs64
structures describing each currently mounted file system.
.Pp
The
.Fn getmntinfo
function
passes its
.Fa flags
argument transparently to
.Xr getfsstat 2 ,
while the
.Fn getmntinfo64
function
passes its
.Fa flags
argument transparently to
.Fn getfsstat64 .
.Sh RETURN VALUES
On successful completion,
.Fn getmntinfo
and
.Fn getmntinfo64
return a count of the number of elements in the array.
The pointer to the array is stored into
.Fa mntbufp .
.Pp
If an error occurs, zero is returned and the external variable
.Va errno
is set to indicate the error.
Although the pointer
.Fa mntbufp
will be unmodified, any information previously returned by
.Fn getmntinfo
or
.Fn getmntinfo64
will be lost.
.Sh ERRORS
The
.Fn getmntinfo
and
.Fn getmntinfo64
functions
may fail and set errno for any of the errors specified for the library
routines
.Xr getfsstat 2
or
.Xr malloc 3 .
.Sh SEE ALSO
.Xr getfsstat 2 ,
.Xr mount 2 ,
.Xr statfs 2 ,
.Xr mount 8
.Sh HISTORY
The
.Fn getmntinfo
function first appeared in
.Bx 4.4 .
.Sh BUGS
The
.Fn getmntinfo
and
.Fn getmntinfo64
functions write the array of structures to an internal static object
and returns
a pointer to that object.
Subsequent calls to
.Fn getmntinfo
and
.Fn getmntinfo64
will modify the same object.
.Pp
The memory allocated by
.Fn getmntinfo
and
.Fn getmntinfo64
cannot be
.Xr free 3 Ns 'd
by the application.