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/*
Write a packet
Copyright (C) Amitay Isaacs 2015
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/network.h"
#include <talloc.h>
#include <tevent.h>
#include "lib/util/tevent_unix.h"
#include "pkt_write.h"
/*
* Write a packet
*/
struct pkt_write_state {
int fd;
uint8_t *buf;
size_t buflen, offset;
};
struct tevent_req *pkt_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd, uint8_t *buf, size_t buflen)
{
struct tevent_req *req;
struct pkt_write_state *state;
req = tevent_req_create(mem_ctx, &state, struct pkt_write_state);
if (req == NULL) {
return NULL;
}
state->fd = fd;
state->buf = buf;
state->buflen = buflen;
state->offset = 0;
return req;
}
void pkt_write_handler(struct tevent_context *ev, struct tevent_fd *fde,
uint16_t flags, struct tevent_req *req)
{
struct pkt_write_state *state = tevent_req_data(
req, struct pkt_write_state);
ssize_t nwritten;
nwritten = write(state->fd, state->buf + state->offset,
state->buflen - state->offset);
if ((nwritten == -1) && (errno == EINTR)) {
/* retry */
return;
}
if (nwritten == -1) {
tevent_req_error(req, errno);
return;
}
if (nwritten == 0) {
/* retry */
return;
}
state->offset += nwritten;
if (state->offset < state->buflen) {
/* come back later */
return;
}
tevent_req_done(req);
}
ssize_t pkt_write_recv(struct tevent_req *req, int *perrno)
{
struct pkt_write_state *state = tevent_req_data(
req, struct pkt_write_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
return state->offset;
}
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