static int
filemon_wrapper_chdir(struct thread *td, struct chdir_args *uap)
{
int error, ret;
size_t len;
struct filemon *filemon;
if ((ret = sys_chdir(td, uap)) == 0) {
if ((filemon = filemon_proc_get(curproc)) != NULL) {
if ((error = copyinstr(uap->path, filemon->fname1,
sizeof(filemon->fname1), NULL)) != 0) {
filemon->error = error;
goto copyfail;
}
len = snprintf(filemon->msgbufr,
sizeof(filemon->msgbufr), "C %d %s\n",
curproc->p_pid, filemon->fname1);
filemon_output(filemon, filemon->msgbufr, len);
copyfail:
filemon_drop(filemon);
}
}
return (ret);
}
/* Attach the filemon to the process. */
static int
filemon_attach_proc(struct filemon *filemon, struct proc *p)
{
struct filemon *filemon2;
sx_assert(&filemon->lock, SA_XLOCKED);
PROC_LOCK_ASSERT(p, MA_OWNED);
KASSERT((p->p_flag & P_WEXIT) == 0,
("%s: filemon %p attaching to exiting process %p",
__func__, filemon, p));
KASSERT((p->p_flag & P_INEXEC) == 0,
("%s: filemon %p attaching to execing process %p",
__func__, filemon, p));
if (p->p_filemon == filemon)
return (0);
/*
* Don't allow truncating other process traces. It is
* not really intended to trace procs other than curproc
* anyhow.
*/
if (p->p_filemon != NULL && p != curproc)
return (EBUSY);
/*
* Historic behavior of filemon has been to let a child initiate
* tracing on itself and cease existing tracing. Bmake
* .META + .MAKE relies on this. It is only relevant for attaching to
* curproc.
*/
while (p->p_filemon != NULL) {
PROC_UNLOCK(p);
sx_xunlock(&filemon->lock);
while ((filemon2 = filemon_proc_get(p)) != NULL) {
/* It may have changed. */
if (p->p_filemon == filemon2)
filemon_proc_drop(p);
filemon_drop(filemon2);
}
sx_xlock(&filemon->lock);
PROC_LOCK(p);
/*
* It may have been attached to, though unlikely.
* Try again if needed.
*/
}
KASSERT(p->p_filemon == NULL,
("%s: proc %p didn't detach filemon %p", __func__, p,
p->p_filemon));
p->p_filemon = filemon_acquire(filemon);
++filemon->proccnt;
return (0);
}
/*
* The devfs file is being closed. Untrace all processes. It is possible
* filemon_close/close(2) was not called.
*/
static void
filemon_dtr(void *data)
{
struct filemon *filemon = data;
if (filemon == NULL)
return;
sx_xlock(&filemon->lock);
/*
* Detach the filemon. It cannot be inherited after this.
*/
filemon_untrack_processes(filemon);
filemon_close_log(filemon);
filemon_drop(filemon);
}
