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FreeBSD 11.0 - man page for getvfsbyname (freebsd section 3)

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

getvfsbyname -- get information about a file system
Standard C Library (libc, -lc)
#include <sys/param.h> #include <sys/mount.h> int getvfsbyname(const char *name, struct xvfsconf *vfc);
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
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.
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.
jail(2), mount(2), sysctl(3), jail(8), mount(8), sysctl(8)
A variant of the getvfsbyname() function first appeared in FreeBSD 2.0.
April 5, 2007 BSD

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