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slirp: use polling callbacks, drop glib requirement 

It would be legitimate to use libslirp without glib. Let's
add_poll/get_revents pair of callbacks to provide the same
functionality.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
This commit is contained in:
Marc-André Lureau 2019-01-17 15:43:57 +04:00 committed by Samuel Thibault
parent 6e513a78ea
commit deaeb3f71d
3 changed files with 109 additions and 52 deletions
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72
net/slirp.c
View File

@ -211,6 +211,71 @@ static const SlirpCb slirp_cb = {
.notify = qemu_notify_event,
};
static int slirp_poll_to_gio(int events)
{
int ret = 0;
if (events & SLIRP_POLL_IN) {
ret |= G_IO_IN;
}
if (events & SLIRP_POLL_OUT) {
ret |= G_IO_OUT;
}
if (events & SLIRP_POLL_PRI) {
ret |= G_IO_PRI;
}
if (events & SLIRP_POLL_ERR) {
ret |= G_IO_ERR;
}
if (events & SLIRP_POLL_HUP) {
ret |= G_IO_HUP;
}
return ret;
}
static int net_slirp_add_poll(int fd, int events, void *opaque)
{
GArray *pollfds = opaque;
GPollFD pfd = {
.fd = fd,
.events = slirp_poll_to_gio(events),
};
int idx = pollfds->len;
g_array_append_val(pollfds, pfd);
return idx;
}
static int slirp_gio_to_poll(int events)
{
int ret = 0;
if (events & G_IO_IN) {
ret |= SLIRP_POLL_IN;
}
if (events & G_IO_OUT) {
ret |= SLIRP_POLL_OUT;
}
if (events & G_IO_PRI) {
ret |= SLIRP_POLL_PRI;
}
if (events & G_IO_ERR) {
ret |= SLIRP_POLL_ERR;
}
if (events & G_IO_HUP) {
ret |= SLIRP_POLL_HUP;
}
return ret;
}
static int net_slirp_get_revents(int idx, void *opaque)
{
GArray *pollfds = opaque;
return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
}
static void net_slirp_poll_notify(Notifier *notifier, void *data)
{
MainLoopPoll *poll = data;
@ -218,12 +283,13 @@ static void net_slirp_poll_notify(Notifier *notifier, void *data)
switch (poll->state) {
case MAIN_LOOP_POLL_FILL:
slirp_pollfds_fill(s->slirp, poll->pollfds, &poll->timeout);
slirp_pollfds_fill(s->slirp, &poll->timeout,
net_slirp_add_poll, poll->pollfds);
break;
case MAIN_LOOP_POLL_OK:
case MAIN_LOOP_POLL_ERR:
slirp_pollfds_poll(s->slirp, poll->pollfds,
poll->state == MAIN_LOOP_POLL_ERR);
slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
net_slirp_get_revents, poll->pollfds);
break;
default:
g_assert_not_reached();

17
slirp/libslirp.h
View File

@ -1,7 +1,6 @@
#ifndef LIBSLIRP_H
#define LIBSLIRP_H
#include <glib.h>
#include <stdint.h>
#include <stdbool.h>
@ -15,8 +14,18 @@
typedef struct Slirp Slirp;
enum {
SLIRP_POLL_IN = 1 << 0,
SLIRP_POLL_OUT = 1 << 1,
SLIRP_POLL_PRI = 1 << 2,
SLIRP_POLL_ERR = 1 << 3,
SLIRP_POLL_HUP = 1 << 4,
};
typedef ssize_t (*SlirpWriteCb)(const void *buf, size_t len, void *opaque);
typedef void (*SlirpTimerCb)(void *opaque);
typedef int (*SlirpAddPollCb)(int fd, int events, void *opaque);
typedef int (*SlirpGetREventsCb)(int idx, void *opaque);
/*
* Callbacks from slirp
@ -63,9 +72,11 @@ Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
void *opaque);
void slirp_cleanup(Slirp *slirp);
void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout);
void slirp_pollfds_fill(Slirp *slirp, uint32_t *timeout,
SlirpAddPollCb add_poll, void *opaque);
void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error);
void slirp_pollfds_poll(Slirp *slirp, int select_error,
SlirpGetREventsCb get_revents, void *opaque);
void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len);

72
slirp/slirp.c
View File

@ -386,7 +386,8 @@ static void slirp_update_timeout(Slirp *slirp, uint32_t *timeout)
*timeout = t;
}
void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout)
void slirp_pollfds_fill(Slirp *slirp, uint32_t *timeout,
SlirpAddPollCb add_poll, void *opaque)
{
struct socket *so, *so_next;
@ -428,12 +429,8 @@ void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout)
* Set for reading sockets which are accepting
*/
if (so->so_state & SS_FACCEPTCONN) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_IN | G_IO_HUP | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
so->pollfds_idx = add_poll(so->s,
SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
continue;
}
@ -441,12 +438,8 @@ void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout)
* Set for writing sockets which are connecting
*/
if (so->so_state & SS_ISFCONNECTING) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_OUT | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
so->pollfds_idx = add_poll(so->s,
SLIRP_POLL_OUT | SLIRP_POLL_ERR, opaque);
continue;
}
@ -455,7 +448,7 @@ void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout)
* we have something to send
*/
if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
events |= G_IO_OUT | G_IO_ERR;
events |= SLIRP_POLL_OUT | SLIRP_POLL_ERR;
}
/*
@ -464,16 +457,12 @@ void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout)
*/
if (CONN_CANFRCV(so) &&
(so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
events |= G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_PRI;
events |= SLIRP_POLL_IN | SLIRP_POLL_HUP |
SLIRP_POLL_ERR | SLIRP_POLL_PRI;
}
if (events) {
GPollFD pfd = {
.fd = so->s,
.events = events,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
so->pollfds_idx = add_poll(so->s, events, opaque);
}
}
@ -508,12 +497,8 @@ void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout)
* (XXX <= 4 ?)
*/
if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_IN | G_IO_HUP | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
so->pollfds_idx = add_poll(so->s,
SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
}
}
@ -538,19 +523,16 @@ void slirp_pollfds_fill(Slirp *slirp, GArray *pollfds, uint32_t *timeout)
}
if (so->so_state & SS_ISFCONNECTED) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_IN | G_IO_HUP | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
so->pollfds_idx = add_poll(so->s,
SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
}
}
slirp_update_timeout(slirp, timeout);
}
void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error)
void slirp_pollfds_poll(Slirp *slirp, int select_error,
SlirpGetREventsCb get_revents, void *opaque)
{
struct socket *so, *so_next;
int ret;
@ -587,8 +569,7 @@ void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error)
revents = 0;
if (so->pollfds_idx != -1) {
revents = g_array_index(pollfds, GPollFD,
so->pollfds_idx).revents;
revents = get_revents(so->pollfds_idx, opaque);
}
if (so->so_state & SS_NOFDREF || so->s == -1) {
@ -598,9 +579,9 @@ void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error)
/*
* Check for URG data
* This will soread as well, so no need to
* test for G_IO_IN below if this succeeds
* test for SLIRP_POLL_IN below if this succeeds
*/
if (revents & G_IO_PRI) {
if (revents & SLIRP_POLL_PRI) {
ret = sorecvoob(so);
if (ret < 0) {
/* Socket error might have resulted in the socket being
@ -611,7 +592,8 @@ void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error)
/*
* Check sockets for reading
*/
else if (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR)) {
else if (revents &
(SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR)) {
/*
* Check for incoming connections
*/
@ -636,7 +618,7 @@ void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error)
* Check sockets for writing
*/
if (!(so->so_state & SS_NOFDREF) &&
(revents & (G_IO_OUT | G_IO_ERR))) {
(revents & (SLIRP_POLL_OUT | SLIRP_POLL_ERR))) {
/*
* Check for non-blocking, still-connecting sockets
*/
@ -689,12 +671,11 @@ void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error)
revents = 0;
if (so->pollfds_idx != -1) {
revents = g_array_index(pollfds, GPollFD,
so->pollfds_idx).revents;
revents = get_revents(so->pollfds_idx, opaque);
}
if (so->s != -1 &&
(revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) {
(revents & (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR))) {
sorecvfrom(so);
}
}
@ -710,12 +691,11 @@ void slirp_pollfds_poll(Slirp *slirp, GArray *pollfds, int select_error)
revents = 0;
if (so->pollfds_idx != -1) {
revents = g_array_index(pollfds, GPollFD,
so->pollfds_idx).revents;
revents = get_revents(so->pollfds_idx, opaque);
}
if (so->s != -1 &&
(revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) {
(revents & (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR))) {
icmp_receive(so);
}
}