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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>";
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