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Add kevent EVFILT_EMPTY for notification when a client has received all data

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i.e. everything outstanding has been acked.

Reviewed by:	bz, gnn (previous version)
MFC after:	3 days
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D9150
This commit is contained in:
Hiren Panchasara 2017-01-16 08:25:33 +00:00
parent 488b4e7e68
commit 7d03ff1fe9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=312277
3 changed files with 28 additions and 1 deletions
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1
sys/kern/kern_event.c
View File

@ -344,6 +344,7 @@ static struct {
{ &null_filtops }, /* EVFILT_LIO */
{ &user_filtops, 1 }, /* EVFILT_USER */
{ &null_filtops }, /* EVFILT_SENDFILE */
{ &file_filtops, 1 }, /* EVFILT_EMPTY */
};
/*

25
sys/kern/uipc_socket.c
View File

@ -161,6 +161,7 @@ static void filt_sowdetach(struct knote *kn);
static int filt_sowrite(struct knote *kn, long hint);
static int filt_solisten(struct knote *kn, long hint);
static int inline hhook_run_socket(struct socket *so, void *hctx, int32_t h_id);
static int filt_soempty(struct knote *kn, long hint);
fo_kqfilter_t soo_kqfilter;
static struct filterops solisten_filtops = {
@ -178,6 +179,11 @@ static struct filterops sowrite_filtops = {
.f_detach = filt_sowdetach,
.f_event = filt_sowrite,
};
static struct filterops soempty_filtops = {
.f_isfd = 1,
.f_detach = filt_sowdetach,
.f_event = filt_soempty,
};
so_gen_t so_gencnt; /* generation count for sockets */
@ -3083,6 +3089,10 @@ soo_kqfilter(struct file *fp, struct knote *kn)
kn->kn_fop = &sowrite_filtops;
sb = &so->so_snd;
break;
case EVFILT_EMPTY:
kn->kn_fop = &soempty_filtops;
sb = &so->so_snd;
break;
default:
return (EINVAL);
}
@ -3344,6 +3354,21 @@ filt_sowrite(struct knote *kn, long hint)
return (kn->kn_data >= so->so_snd.sb_lowat);
}
static int
filt_soempty(struct knote *kn, long hint)
{
struct socket *so;
so = kn->kn_fp->f_data;
SOCKBUF_LOCK_ASSERT(&so->so_snd);
kn->kn_data = sbused(&so->so_snd);
if (kn->kn_data == 0)
return (1);
else
return (0);
}
/*ARGSUSED*/
static int
filt_solisten(struct knote *kn, long hint)

3
sys/sys/event.h
View File

@ -43,7 +43,8 @@
#define EVFILT_LIO (-10) /* attached to lio requests */
#define EVFILT_USER (-11) /* User events */
#define EVFILT_SENDFILE (-12) /* attached to sendfile requests */
#define EVFILT_SYSCOUNT 12
#define EVFILT_EMPTY (-13) /* empty send socket buf */
#define EVFILT_SYSCOUNT 13
#define EV_SET(kevp_, a, b, c, d, e, f) do { \
struct kevent *kevp = (kevp_); \