freebsd man page for getvfsbyname

GETVFSBYNAME(3) 					   BSD Library Functions Manual 					   GETVFSBYNAME(3)

NAME
     getvfsbyname -- get information about a file system

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/param.h>
     #include <sys/mount.h>

     int
     getvfsbyname(const char *name, struct xvfsconf *vfc);

DESCRIPTION
     The getvfsbyname() function provides access to information about a file system module that is configured in the kernel.  If successful, the
     requested file system xvfsconf is returned in the location pointed to by vfc.  The fields in a ``struct xvfsconf'' are defined as follows:

     vfc_name	   the name of the file system
     vfc_typenum   the file system type number assigned by the kernel
     vfc_refcount  the number of active mount points using the file system
     vfc_flags	   flag bits, as described below

     The flags are defined as follows:

     VFCF_STATIC      statically compiled into kernel
     VFCF_NETWORK     may get data over the network
     VFCF_READONLY    writes are not implemented
     VFCF_SYNTHETIC   data does not represent real files
     VFCF_LOOPBACK    aliases some other mounted FS
     VFCF_UNICODE     stores file names as Unicode
     VFCF_JAIL	      can be mounted from within a jail if security.jail.mount_allowed sysctl is set to 1
     VFCF_DELEGADMIN  supports delegated administration if vfs.usermount sysctl is set to 1

RETURN VALUES
     The getvfsbyname() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to
     indicate the error.

ERRORS
     The following errors may be reported:

     [EFAULT]		The vfc argument points to an invalid address.

     [ENOENT]		The name argument specifies a file system that is unknown or not configured in the kernel.

SEE ALSO
     jail(2), mount(2), sysctl(3), jail(8), mount(8), sysctl(8)

HISTORY
     A variant of the getvfsbyname() function first appeared in FreeBSD 2.0.

BSD
								   April 5, 2007							       BSD