minix/lib/libc/sys/statvfs.2
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

178 lines
4.4 KiB
Groff

.\" $NetBSD: statvfs.2,v 1.5 2010/05/31 12:16:20 njoly Exp $
.\"
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.\" @(#)statfs.2 8.5 (Berkeley) 5/24/95
.\"
.Dd April 14, 2004
.Dt STATVFS 2
.Os
.Sh NAME
.Nm statvfs ,
.Nm statvfs1 ,
.Nm fstatvfs ,
.Nm fstatvfs1
.Nd get file system statistics
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/statvfs.h
.Ft int
.Fn statvfs "const char *path" "struct statvfs *buf"
.Ft int
.Fn statvfs1 "const char *path" "struct statvfs *buf" "int flags"
.Ft int
.Fn fstatvfs "int fd" "struct statvfs *buf"
.Ft int
.Fn fstatvfs1 "int fd" "struct statvfs *buf" "int flags"
.Sh DESCRIPTION
.Fn statvfs
and
.Fn statvfs1
return information about a mounted file system.
.Fa path
is the path name of any file within the mounted file system.
.Fa buf
is a pointer to a
.Nm statvfs
structure defined in
.Xr statvfs 5 .
.Pp
.Fn fstatvfs
and
.Fn fstatvfs1
return the same information about an open file referenced by descriptor
.Fa fd .
.Pp
The
.Fn statvfs1
and
.Fn fstatvfs1
functions allow an extra
.Fa flags
argument which can be
.Dv ST_WAIT
and
.Dv ST_NOWAIT .
When
.Dv ST_NOWAIT
is specified, then only cached statistics are returned.
This can result in significant savings on non-local filesystems, where
gathering statistics involves a network communication.
.Pp
The
.Fn statvfs
and
.Fn fstatvfs
calls are equivalent to the respective
.Fn statvfs1
and
.Fn fstatvfs1
calls with
.Dv ST_WAIT
specified as the
.Fa flags
argument.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, \-1 is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn statvfs
and
.Fn statvfs1
fail if one or more of the following are true:
.Bl -tag -width Er
.It Bq Er ENOTDIR
A component of the path prefix of
.Fa path
is not a directory.
.It Bq Er ENAMETOOLONG
The length of a component of
.Fa path
exceeds
.Brq Dv NAME_MAX
characters, or the length of
.Fa path
exceeds
.Brq Dv PATH_MAX
characters.
.It Bq Er ENOENT
The file referred to by
.Fa path
does not exist.
.It Bq Er EACCES
Search permission is denied for a component of the path prefix of
.Fa path .
.It Bq Er ELOOP
Too many symbolic links were encountered in translating
.Fa path .
.It Bq Er EFAULT
.Fa buf
or
.Fa path
points to an invalid address.
.It Bq Er EIO
An
.Tn I/O
error occurred while reading from or writing to the file system.
.El
.Pp
.Fn fstatvfs
and
.Fn fstatvfs1
fail if one or more of the following are true:
.Bl -tag -width Er
.It Bq Er EBADF
.Fa fd
is not a valid open file descriptor.
.It Bq Er EFAULT
.Fa buf
points to an invalid address.
.It Bq Er EIO
An
.Tn I/O
error occurred while reading from or writing to the file system.
.El
.Sh SEE ALSO
.Xr statvfs 5
.Sh HISTORY
The
.Fn statvfs ,
.Fn statvfs1 ,
.Fn fstatvfs ,
and
.Fn fstatvfs1
functions first appeared in
.Nx 3.0
to replace
the
.Fn statfs
family of functions which first appeared in
.Bx 4.4 .