UNREGISTER_FILESYSTE(9) The Linux VFS UNREGISTER_FILESYSTE(9)NAME
unregister_filesystem - unregister a file system
SYNOPSIS
int unregister_filesystem(struct file_system_type * fs);
ARGUMENTS
fs
filesystem to unregister
DESCRIPTION
Remove a file system that was previously successfully registered with the kernel. An error is returned if the file system is not found.
Zero is returned on a success.
Once this function has returned the struct file_system_type structure may be freed or reused.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 UNREGISTER_FILESYSTE(9)
Check Out this Related Man Page
KFILTER_REGISTER(9) BSD Kernel Developer's Manual KFILTER_REGISTER(9)NAME
kfilter_register, kfilter_unregister -- add or remove kernel event filters
SYNOPSIS
#include <sys/event.h>
int
kfilter_register(const char *name, struct filterops *filtops, int *retfilter);
int
kfilter_unregister(const char *name);
DESCRIPTION
The kfilter_register() function adds a new kernel event filter (kfilter) to the system, for use by callers of kqueue(2) and kevent(2). name
is the name of the new filter (which must not already exist), and filtops is a pointer to a filterops structure which describes the filter
operations. Both name and filtops will be copied to an internal data structure, and a new filter number will be allocated. If retfilter is
not NULL, then the new filter number will be returned in the address pointed at by retfilter.
The kfilter_unregister() function removes a kfilter named name that was previously registered with kfilter_register(). If a filter with the
same name is later reregistered with kfilter_register(), it will get a different filter number (i.e., filter numbers are not recycled). It
is not possible to unregister the system filters (i.e., those that start with ``EVFILT_'' and are documented in kqueue(2)).
The filterops structure is defined as follows:
struct filterops {
int f_isfd; /* true if ident == filedescriptor */
int (*f_attach)(struct knote *kn);
/* called when knote is ADDed */
void (*f_detach)(struct knote *kn);
/* called when knote is DELETEd */
int (*f_event)(struct knote *kn, long hint);
/* called when event is triggered */
};
If the filter operation is for a file descriptor, f_isfd should be non-zero, otherwise it should be zero. This controls where the kqueue(2)
system stores the knotes for an object.
RETURN VALUES
kfilter_register() returns 0 on success, EINVAL if there's an invalid argument, or EEXIST if the filter already exists,
kfilter_unregister() returns 0 on success, EINVAL if there's an invalid argument, or ENOENT if the filter doesn't exist.
SEE ALSO kqueue(2), free(9), knote(9), malloc(9)HISTORY
The kfilter_register() and kfilter_unregister() functions first appeared in NetBSD 2.0.
AUTHORS
The kfilter_register() and kfilter_unregister() functions were implemented by Luke Mewburn <lukem@NetBSD.org>.
BSD October 23, 2002 BSD
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