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9bccf70c A	1	.\" $NetBSD: getfsstat.2,v 1.6 1995/06/29 11:40:44 cgd Exp $
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	34	.\" @(#)getfsstat.2 8.1 (Berkeley) 6/9/93
	35	.\"
b0d623f7	36	.Dd Oct 28, 2008
9bccf70c A	37	.Dt GETFSSTAT 2
	38	.Os
	39	.Sh NAME
	40	.Nm getfsstat
	41	.Nd get list of all mounted file systems
	42	.Sh SYNOPSIS
	43	.Fd #include <sys/param.h>
	44	.Fd #include <sys/ucred.h>
	45	.Fd #include <sys/mount.h>
	46	.Ft int
91447636	47	.Fn getfsstat "struct statfs *buf" "int bufsize" "int flags"
b0d623f7 A	48	.Sh TRANSITIIONAL SYNOPSIS (NOW DEPRECATED)
	49	.Ft int
	50	.br
	51	.Fn getfsstat64 "struct statfs64 *buf" "int bufsize" "int flags" ;
9bccf70c	52	.Sh DESCRIPTION
b0d623f7 A	53	The
	54	.Fn getfsstat
	55	function returns information about all mounted file systems.
	56	The
	57	.Fa buf
	58	argument is a pointer to an array of
b0d623f7	59	.Fa statfs
6d2010ae A	60	structures (see
	61	.Xr statfs 2 ) .
	62	As
	63	.Xr statfs 2
	64	indicates, the structure is defined differently depending on
	65	whether the macro _DARWIN_FEATURE_64_BIT_INODE is defined (see
	66	.Xr stat 2
	67	for more information on this macro).
9bccf70c A	68	.Pp
	69	Fields that are undefined for a particular file system are set to -1.
	70	The buffer is filled with an array of
	71	.Fa statfs
	72	structures, one for each mounted file system
	73	up to the size specified by
	74	.Fa bufsize .
	75	.Pp
	76	If
	77	.Fa buf
	78	is given as NULL,
	79	.Fn getfsstat
	80	returns just the number of mounted file systems.
	81	.Pp
9bccf70c A	82	If
	83	.Fa flags
	84	is set to
	85	.Dv MNT_NOWAIT ,
	86	.Fn getfsstat
91447636 A	87	will directly return the information retained in the kernel
	88	to avoid delays caused by waiting for updated information from
	89	a file system that is perhaps temporarily unable to respond.
	90	Some of the information returned may be out of date, however; if
	91	.Fa flags
	92	is set to
	93	.Dv MNT_WAIT
b0d623f7 A	94	or
b0d623f7 A	95	.Dv MNT_DWAIT
91447636	96	instead,
9bccf70c	97	.Fn getfsstat
91447636 A	98	will request updated information from each mounted filesystem before
91447636 A	99	returning.
9bccf70c A	100	.Sh RETURN VALUES
	101	Upon successful completion, the number of
	102	.Fa statfs
	103	structures is returned.
	104	Otherwise, -1 is returned and the global variable
	105	.Va errno
	106	is set to indicate the error.
	107	.Sh ERRORS
39037602	108	.Fn getfsstat
9bccf70c A	109	fails if one or more of the following are true:
	110	.Bl -tag -width Er
	111	.It Bq Er EFAULT
b0d623f7 A	112	The
	113	.Fa buf
	114	argument points to an invalid address.
9bccf70c A	115	.It Bq Er EIO
	116	An
	117	.Tn I/O
	118	error occurred while reading from or writing to the file system.
	119	.El
b0d623f7 A	120	.Sh TRANSITIONAL DESCRIPTION (NOW DEPRECATED)
	121	The
	122	.Fn getfsstat64
	123	routine is equivalent to the default
	124	.Fn getfstat
	125	(when
	126	.Dv _DARWIN_FEATURE_64_BIT_INODE
	127	is defined), so there is no longer any reason to use it (it will be removed
	128	in the future).
9bccf70c	129	.Sh SEE ALSO
6d2010ae	130	.Xr stat 2 ,
9bccf70c A	131	.Xr statfs 2 ,
	132	.Xr fstab 5 ,
	133	.Xr mount 8
	134	.Sh HISTORY
	135	The
	136	.Fn getfsstat
	137	function first appeared in 4.4BSD.