cddl/contrib/dtracetoolkit/Snippits/fd2pathname.txt

   1 You have a file descriptor (probably from a syscall), and you want the
   2 corresponding pathname.
   3
   4 If you are on newer versions of DTrace, there is the fds[] array,
   5
   6 # dtrace -n 'syscall::read:entry { @[fds[arg0].fi_pathname] = count(); }'
   7 dtrace: description 'syscall::read:entry ' matched 1 probe
   8 ^C
   9
  10   /etc/minor_perm                                                   2
  11   /etc/mnttab                                                       2
  12   /etc/motd                                                         2
  13   /etc/magic                                                        4
  14   /usr/sbin/clri                                                    5
  15   /devices/pseudo/clone@0:ptm                                       6
  16   /sbin/mount                                                       6
  17   /dev/pts/28                                                       7
  18   /devices/pseudo/consms@0:mouse                                   31
  19   /devices/pseudo/conskbd@0:kbd                                    47
  20   <unknown>                                                       351
  21
  22 easy.
  23
  24 but if you are on an older version of DTrace, try this to convert from
  25 this->fd to self->vpath,
  26
  27         this->filep =
  28             curthread->t_procp->p_user.u_finfo.fi_list[this->fd].uf_file;
  29         this->vnodep = this->filep != 0 ? this->filep->f_vnode : 0;
  30         self->vpath = this->vnodep ? (this->vnodep->v_path != 0 ?
  31             cleanpath(this->vnodep->v_path) : "<unknown>") : "<unknown>";
  32