Differential D58123 Diff 181871 sys/kern/sys_procdesc.c

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sys/kern/sys_procdesc.c

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* Open questions:		* Open questions:
*		*
* - Will we want to add a pidtoprocdesc(2) system call to allow process		* - Will we want to add a pidtoprocdesc(2) system call to allow process
* descriptors to be created for processes without pdfork(2)?		* descriptors to be created for processes without pdfork(2)?
*/		*/

#include <sys/param.h>		#include <sys/param.h>
#include <sys/capsicum.h>		#include <sys/capsicum.h>
		#include <sys/event.h>
#include <sys/fcntl.h>		#include <sys/fcntl.h>
#include <sys/file.h>		#include <sys/file.h>
#include <sys/filedesc.h>		#include <sys/filedesc.h>
#include <sys/imgact.h>		#include <sys/imgact.h>
#include <sys/kernel.h>		#include <sys/kernel.h>
#include <sys/lock.h>		#include <sys/lock.h>
#include <sys/mutex.h>		#include <sys/mutex.h>
#include <sys/poll.h>		#include <sys/poll.h>
▲ Show 20 Lines • Show All 267 Lines • ▼ Show 20 Lines	procdesc_exit(struct proc *p)
if (pd->pd_fpcount == 0) {		if (pd->pd_fpcount == 0) {
PROCDESC_UNLOCK(pd);		PROCDESC_UNLOCK(pd);
pd->pd_proc = NULL;		pd->pd_proc = NULL;
p->p_procdesc = NULL;		p->p_procdesc = NULL;
procdesc_free(pd);		procdesc_free(pd);
return (1);		return (1);
}		}
selwakeup(&pd->pd_selinfo);		selwakeup(&pd->pd_selinfo);
KNOTE_LOCKED(&pd->pd_selinfo.si_note, NOTE_EXIT);		KNOTE_LOCKED(&pd->pd_selinfo.si_note, NOTE_EXIT \| NOTE_PDSIGCHLD);
		markjUnsubmitted Done Inline Actions In procdesc_kqops_event() there is a test, `if (event == NOTE_EXIT)`. Probably that needs to change to `if (event & NOTE_EXIT)`. markj: In procdesc_kqops_event() there is a test, `if (event == NOTE_EXIT)`. Probably that needs to…
PROCDESC_UNLOCK(pd);		PROCDESC_UNLOCK(pd);

/* Wakeup all waiters for this procdesc' process exit. */		/* Wakeup all waiters for this procdesc' process exit. */
wakeup(&p->p_procdesc);		wakeup(&p->p_procdesc);
return (0);		return (0);
}		}

		void
		procdesc_jobstate(struct proc *p)
		{
		struct procdesc *pd;

		PROC_LOCK_ASSERT(p, MA_OWNED);
		pd = p->p_procdesc;
		if (pd == NULL)
		return;

		PROCDESC_LOCK(pd);
		KNOTE_LOCKED(&pd->pd_selinfo.si_note, NOTE_PDSIGCHLD);
		PROCDESC_UNLOCK(pd);
		}

/*		/*
* When a process descriptor is reaped, perhaps as a result of close(), release		* When a process descriptor is reaped, perhaps as a result of close(), release
* the process's reference on the process descriptor.		* the process's reference on the process descriptor.
*/		*/
void		void
procdesc_reap(struct proc *p)		procdesc_reap(struct proc *p)
{		{
struct procdesc *pd;		struct procdesc *pd;
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procdesc_kqops_event(struct knote *kn, long hint)		procdesc_kqops_event(struct knote *kn, long hint)
{		{
struct procdesc *pd;		struct procdesc *pd;
u_int event;		u_int event;

pd = kn->kn_fp->f_data;		pd = kn->kn_fp->f_data;
if (hint == 0) {		if (hint == 0) {
/*		/*
* Initial test after registration. Generate a NOTE_EXIT in		* Initial test after registration. Generate notes in
* case the process already terminated before registration.		* case the process already terminated before registration.
*/		*/
event = pd->pd_flags & PDF_EXITED ? NOTE_EXIT : 0;		event = (pd->pd_flags & PDF_EXITED) != 0 ? (NOTE_EXIT \|
		NOTE_PDSIGCHLD) : 0;
		markjUnsubmitted Done Inline Actions Should this generate NOTE_PDSIGCHLD too? markj: Should this generate NOTE_PDSIGCHLD too?
} else {		} else {
/* Mask off extra data. */		/* Mask off extra data. */
event = (u_int)hint & NOTE_PCTRLMASK;		event = (u_int)hint & NOTE_PCTRLMASK;
}		}

/* If the user is interested in this event, record it. */		/* If the user is interested in this event, record it. */
if (kn->kn_sfflags & event)		if (kn->kn_sfflags & event)
kn->kn_fflags \|= event;		kn->kn_fflags \|= event;

/* Process is gone, so flag the event as finished. */		/* Process is gone, so flag the event as finished. */
if (event == NOTE_EXIT) {		if ((event & NOTE_EXIT) != 0) {
kn->kn_flags \|= EV_EOF \| EV_ONESHOT;		kn->kn_flags \|= EV_EOF \| EV_ONESHOT;
if (kn->kn_fflags & NOTE_EXIT)		if (kn->kn_fflags & NOTE_EXIT)
kn->kn_data = pd->pd_xstat;		kn->kn_data = pd->pd_xstat;
if (kn->kn_fflags == 0)		if (kn->kn_fflags == 0)
kn->kn_flags \|= EV_DROP;		kn->kn_flags \|= EV_DROP;
return (1);		return (1);
}		}

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