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MOUNTROOTHOOK_ESTABLI... BSD Kernel Developer's ManualMOUNTROOTHOOK_ESTABLI...

NAME
     mountroothook_establish, mountroothook_disestablish -- add or remove a
     mountroot hook

SYNOPSIS
     #include <&lt;sys/types.h>&gt;
     #include <&lt;sys/systm.h>&gt;

     void *
     mountroothook_establish(void (*fn)(void *), void *arg);

     void
     mountroothook_disestablish(void *cookie);

DESCRIPTION
     The mountroothook_establish() function adds fn to the list of hooks
     invoked by domountroothooks(9) at mountroot.  When invoked, the hook
     function fn will be passed arg as its only argument.

     The mountroothook_disestablish() function removes the hook described by
     the opaque pointer cookie from the list of hooks to be invoked at mount-
     root.  If cookie is invalid, the result of mountroothook_disestablish()
     is undefined.

     Mountroot hooks should be used to perform one-time activities that must
     happen immediately after the root filesystem has been mounted by the ker-
     nel, but before init(8) has been started.

     Mountroot hooks are, like startup hooks, implemented via the more general
     dohooks(9) API.

RETURN VALUES
     If successful, mountroothook_establish() returns an opaque pointer
     describing the newly established mountroot hook.  Otherwise, it returns
     NULL.

EXAMPLES
     It may be appropriate to use a mountroot hook to split the attach func-
     tion of a device driver.  Once the root filesystem is mounted, the hook
     will be called and it is safe to use loadfirmware(9) to get the firmware
     out of the filesystem.

SEE ALSO
     dohooks(9), domountroothooks(9), dostartuphooks(9)

BUGS
     The names are clumsy, at best.

BSD                              June 4, 2013                              BSD