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/*
* Copyright (c) 2009 Eric Faurot <eric@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "imsgev.h"
void imsgev_add(struct imsgev *);
void imsgev_dispatch(int, short, void *);
void imsgev_disconnect(struct imsgev *, int);
void
imsgev_init(struct imsgev *iev, int fd, void *data,
void (*callback)(struct imsgev *, int, struct imsg *),
void (*needfd)(struct imsgev *))
{
imsg_init(&iev->ibuf, fd);
iev->terminate = 0;
iev->data = data;
iev->handler = imsgev_dispatch;
iev->callback = callback;
iev->needfd = needfd;
iev->events = EV_READ;
event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
event_add(&iev->ev, NULL);
}
int
imsgev_compose(struct imsgev *iev, u_int16_t type, u_int32_t peerid,
uint32_t pid, int fd, void *data, u_int16_t datalen)
{
int r;
r = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen);
if (r != -1)
imsgev_add(iev);
return (r);
}
void
imsgev_close(struct imsgev *iev)
{
iev->terminate = 1;
imsgev_add(iev);
}
void
imsgev_clear(struct imsgev *iev)
{
event_del(&iev->ev);
msgbuf_clear(&iev->ibuf.w);
close(iev->ibuf.fd);
}
void
imsgev_add(struct imsgev *iev)
{
short events = 0;
if (!iev->terminate)
events = EV_READ;
if (iev->ibuf.w.queued || iev->terminate)
events |= EV_WRITE;
/* optimization: skip event_{del/set/add} if already set */
if (events == iev->events)
return;
iev->events = events;
event_del(&iev->ev);
event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
event_add(&iev->ev, NULL);
}
void
imsgev_dispatch(int fd, short ev, void *humppa)
{
struct imsgev *iev = humppa;
struct imsgbuf *ibuf = &iev->ibuf;
struct imsg imsg;
ssize_t n;
iev->events = 0;
if (ev & EV_READ) {
if ((n = imsg_read(ibuf)) == -1) {
/* if we don't have enough fds, free one up and retry */
if (errno == EAGAIN) {
iev->needfd(iev);
n = imsg_read(ibuf);
}
if (n == -1) {
imsgev_disconnect(iev, IMSGEV_EREAD);
return;
}
}
if (n == 0) {
/*
* Connection is closed for reading, and we assume
* it is also closed for writing, so we error out
* if write data is pending.
*/
imsgev_disconnect(iev,
(iev->ibuf.w.queued) ? IMSGEV_EWRITE : IMSGEV_DONE);
return;
}
}
if (ev & EV_WRITE) {
/*
* We wanted to write data out but the connection is either
* closed, or some error occured. Both case are not recoverable
* from the imsg perspective, so we treat it as a WRITE error.
*/
if ((n = msgbuf_write(&ibuf->w)) != 1) {
imsgev_disconnect(iev, IMSGEV_EWRITE);
return;
}
}
while (iev->terminate == 0) {
if ((n = imsg_get(ibuf, &imsg)) == -1) {
imsgev_disconnect(iev, IMSGEV_EIMSG);
return;
}
if (n == 0)
break;
iev->callback(iev, IMSGEV_IMSG, &imsg);
imsg_free(&imsg);
}
if (iev->terminate && iev->ibuf.w.queued == 0) {
imsgev_disconnect(iev, IMSGEV_DONE);
return;
}
imsgev_add(iev);
}
void
imsgev_disconnect(struct imsgev *iev, int code)
{
iev->callback(iev, code, NULL);
}
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