gen/getvfsbyname.3

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  32 .\"     @(#)kvm_getvfsbyname.3  8.3 (Berkeley) 5/4/95
  33 .\" $FreeBSD: src/lib/libc/gen/getvfsbyname.3,v 1.12 2001/10/01 16:08:51 ru Exp $
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  35 .Dd May 4, 1995
  36 .Dt GETVFSBYNAME 3
  37 .Os
  38 .Sh NAME
  39 .Nm getvfsbyname
  40 .Nd get information about a filesystem
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In sys/param.h
  45 .In sys/mount.h
  46 .Ft int
  47 .Fn getvfsbyname "const char *name" "struct vfsconf *vfc"
  48 .Sh DESCRIPTION
  49 The
  50 .Fn getvfsbyname
  51 function provides access to information about a
  52 filesystem module that is configured in the kernel.
  53 If successful,
  54 the requested filesystem
  55 .Fa vfsconf
  56 is returned in the location pointed to by
  57 .Fa vfc .
  58 The fields in a
  59 .Dq Li struct vfsconf
  60 are defined as follows:
  61 .Pp
  62 .Bl -tag -compact -width vfc_refcount
  63 .It vfc_name
  64 the name of the filesystem
  65 .It vfc_typenum
  66 the filesystem type number assigned by the kernel
  67 .It vfc_refcount
  68 the number of active mount points using the filesystem
  69 .El
  70 .Sh RETURN VALUES
  71 .Rv -std getvfsbyname
  72 .Sh ERRORS
  73 The following errors may be reported:
  74 .Bl -tag -width Er
  75 .It Bq Er EFAULT
  76 The
  77 .Fa vfc
  78 pointer contains an invalid address.
  79 .It Bq Er ENOENT
  80 The
  81 .Fa name
  82 specifies a filesystem that is unknown or not configured in the kernel.
  83 .El
  84 .Sh SEE ALSO
  85 .Xr mount 2 ,
  86 .Xr sysctl 3 ,
  87 .Xr mount 8 ,
  88 .Xr sysctl 8
  89 .Sh HISTORY
  90 A variant of the
  91 .Fn getvfsbyname
  92 function first appeared in
  93 .Fx 2.0 .