kern/include/fdtap.h

   1 /* Copyright (c) 2015 Google Inc
   2  * Barret Rhoden <brho@cs.berkeley.edu>
   3  * See LICENSE for details.
   4  *
   5  * FD taps.  Allows the user to receive events when certain things happen to an
   6  * FD's underlying disk/device file. */
   7
   8 #pragma once
   9
  10 #include <ros/fdtap.h>
  11 #include <sys/queue.h>
  12 #include <kref.h>
  13
  14 struct proc;
  15 struct event_queue;
  16 struct chan;
  17
  18 struct fd_tap;
  19 SLIST_HEAD(fdtap_slist, fd_tap);
  20
  21 struct fd_tap {
  22         SLIST_ENTRY(fd_tap)                     link;   /* for device use */
  23         struct kref                                     kref;
  24         struct chan                                     *chan;
  25         int                                                     fd;
  26         int                                                     filter;
  27         struct proc                                     *proc;
  28         struct event_queue                      *ev_q;
  29         int                                                     ev_id;
  30         void                                            *data;
  31 };
  32
  33 int add_fd_tap(struct proc *p, struct fd_tap_req *tap_req);
  34 int remove_fd_tap(struct proc *p, int fd);
  35 int fire_tap(struct fd_tap *tap, int filter);