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locks; strict;
comment	@# @;


1.1
date	2015.09.30.22.01.09;	author christos;	state Exp;
branches
	1.1.1.1;
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commitid	d9nN99160jbCfkDy;

1.1.1.1
date	2015.09.30.22.01.09;	author christos;	state Exp;
branches;
next	;
commitid	d9nN99160jbCfkDy;


desc
@@



1.1
log
@Initial revision
@
text
@You have a file descriptor (probably from a syscall), and you want the
corresponding pathname.

If you are on newer versions of DTrace, there is the fds[] array,

# dtrace -n 'syscall::read:entry { @@[fds[arg0].fi_pathname] = count(); }'
dtrace: description 'syscall::read:entry ' matched 1 probe
^C

  /etc/minor_perm                                                   2
  /etc/mnttab                                                       2
  /etc/motd                                                         2
  /etc/magic                                                        4
  /usr/sbin/clri                                                    5
  /devices/pseudo/clone@@0:ptm                                       6
  /sbin/mount                                                       6
  /dev/pts/28                                                       7
  /devices/pseudo/consms@@0:mouse                                   31
  /devices/pseudo/conskbd@@0:kbd                                    47
  <unknown>                                                       351

easy.

but if you are on an older version of DTrace, try this to convert from
this->fd to self->vpath,

        this->filep =
	    curthread->t_procp->p_user.u_finfo.fi_list[this->fd].uf_file;
        this->vnodep = this->filep != 0 ? this->filep->f_vnode : 0;
        self->vpath = this->vnodep ? (this->vnodep->v_path != 0 ?
            cleanpath(this->vnodep->v_path) : "<unknown>") : "<unknown>";

@


1.1.1.1
log
@Import the dtrace toolkit from FreeBSD; simple scripts such as dtruss work
unmodified. For others we'll need to add the missing probes and adjust.
This is not attached to the build.
@
text
@@