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/*
Unix SMB/CIFS implementation.
common events code for fd events
Copyright (C) Stefan Metzmacher 2009
** NOTE! The following LGPL license applies to the tevent
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#define TEVENT_DEPRECATED 1
#include "tevent.h"
#include "tevent_internal.h"
#include "tevent_util.h"
_PRIVATE_
const char *tevent_common_fd_str(struct tevent_common_fd_buf *buf,
const char *description,
const struct tevent_fd *fde)
{
snprintf(buf->buf, sizeof(buf->buf),
"%s[fde=%p,"
"fd=%d,flags=0x%x(%s%s%s),%s]",
description, fde, fde->fd,
fde->flags,
(fde->flags & TEVENT_FD_ERROR) ? "E" : "",
(fde->flags & TEVENT_FD_READ) ? "R" : "",
(fde->flags & TEVENT_FD_WRITE) ? "W" : "",
fde->handler_name);
return buf->buf;
}
int tevent_common_fd_destructor(struct tevent_fd *fde)
{
struct tevent_fd *primary = NULL;
if (fde->destroyed) {
tevent_common_check_double_free(fde, "tevent_fd double free");
goto done;
}
fde->destroyed = true;
/*
* The caller should have cleared it from any mpx relationship
*/
primary = tevent_common_fd_mpx_primary(fde);
if (primary != fde) {
tevent_abort(fde->event_ctx,
"tevent_common_fd_destructor: fde not mpx primary");
} else if (fde->mpx.list != NULL) {
tevent_abort(fde->event_ctx,
"tevent_common_fd_destructor: fde has mpx fdes");
}
if (fde->event_ctx) {
tevent_trace_fd_callback(fde->event_ctx, fde, TEVENT_EVENT_TRACE_DETACH);
DLIST_REMOVE(fde->event_ctx->fd_events, fde);
}
if (fde->close_fn) {
fde->close_fn(fde->event_ctx, fde, fde->fd, fde->private_data);
fde->fd = -1;
fde->close_fn = NULL;
}
fde->event_ctx = NULL;
done:
if (fde->busy) {
return -1;
}
fde->wrapper = NULL;
return 0;
}
struct tevent_fd *tevent_common_add_fd(struct tevent_context *ev, TALLOC_CTX *mem_ctx,
int fd, uint16_t flags,
tevent_fd_handler_t handler,
void *private_data,
const char *handler_name,
const char *location)
{
struct tevent_fd *fde;
/* tevent will crash later on select() if we save
* a negative file descriptor. Better to fail here
* so that consumers will be able to debug it
*/
if (fd < 0) return NULL;
fde = talloc(mem_ctx?mem_ctx:ev, struct tevent_fd);
if (!fde) return NULL;
*fde = (struct tevent_fd) {
.event_ctx = ev,
.fd = fd,
.flags = flags,
.handler = handler,
.private_data = private_data,
.handler_name = handler_name,
.location = location,
};
tevent_trace_fd_callback(fde->event_ctx, fde, TEVENT_EVENT_TRACE_ATTACH);
DLIST_ADD(ev->fd_events, fde);
tevent_common_fd_mpx_reinit(fde);
talloc_set_destructor(fde, tevent_common_fd_destructor);
return fde;
}
uint16_t tevent_common_fd_get_flags(struct tevent_fd *fde)
{
return fde->flags;
}
void tevent_common_fd_set_flags(struct tevent_fd *fde, uint16_t flags)
{
if (fde->flags == flags) return;
fde->flags = flags;
}
void tevent_common_fd_set_close_fn(struct tevent_fd *fde,
tevent_fd_close_fn_t close_fn)
{
fde->close_fn = close_fn;
}
int tevent_common_invoke_fd_handler(struct tevent_fd *fde, uint16_t flags,
bool *removed)
{
struct tevent_context *handler_ev = fde->event_ctx;
if (removed != NULL) {
*removed = false;
}
if (fde->event_ctx == NULL) {
return 0;
}
fde->busy = true;
if (fde->wrapper != NULL) {
handler_ev = fde->wrapper->wrap_ev;
tevent_wrapper_push_use_internal(handler_ev, fde->wrapper);
fde->wrapper->ops->before_fd_handler(
fde->wrapper->wrap_ev,
fde->wrapper->private_state,
fde->wrapper->main_ev,
fde,
flags,
fde->handler_name,
fde->location);
}
tevent_trace_fd_callback(fde->event_ctx, fde, TEVENT_EVENT_TRACE_BEFORE_HANDLER);
fde->handler(handler_ev, fde, flags, fde->private_data);
if (fde->wrapper != NULL) {
fde->wrapper->ops->after_fd_handler(
fde->wrapper->wrap_ev,
fde->wrapper->private_state,
fde->wrapper->main_ev,
fde,
flags,
fde->handler_name,
fde->location);
tevent_wrapper_pop_use_internal(handler_ev, fde->wrapper);
}
fde->busy = false;
if (fde->destroyed) {
talloc_set_destructor(fde, NULL);
TALLOC_FREE(fde);
if (removed != NULL) {
*removed = true;
}
}
return 0;
}
void tevent_fd_set_tag(struct tevent_fd *fde, uint64_t tag)
{
if (fde == NULL) {
return;
}
fde->tag = tag;
}
uint64_t tevent_fd_get_tag(const struct tevent_fd *fde)
{
if (fde == NULL) {
return 0;
}
return fde->tag;
}
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