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ipcc.c
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ipcc.c
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/*
* Copyright (C) 2010 Red Hat, Inc.
*
* Author: Angus Salkeld <asalkeld@redhat.com>
*
* This file is part of libqb.
*
* libqb 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 2.1 of the License, or
* (at your option) any later version.
*
* libqb 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 libqb. If not, see <http://www.gnu.org/licenses/>.
*/
#include "os_base.h"
#include "ipc_int.h"
#include "util_int.h"
#include <qb/qbdefs.h>
#include <qb/qbipcc.h>
qb_ipcc_connection_t *
qb_ipcc_connect(const char *name, size_t max_msg_size)
{
int32_t res;
qb_ipcc_connection_t *c = NULL;
struct qb_ipc_connection_response response;
c = calloc(1, sizeof(struct qb_ipcc_connection));
if (c == NULL) {
return NULL;
}
c->setup.max_msg_size = QB_MAX(max_msg_size,
sizeof(struct qb_ipc_connection_response));
(void)strlcpy(c->name, name, NAME_MAX);
res = qb_ipcc_us_setup_connect(c, &response);
if (res < 0) {
goto disconnect_and_cleanup;
}
c->response.type = response.connection_type;
c->request.type = response.connection_type;
c->event.type = response.connection_type;
c->setup.type = response.connection_type;
c->response.max_msg_size = response.max_msg_size;
c->request.max_msg_size = response.max_msg_size;
c->event.max_msg_size = response.max_msg_size;
c->receive_buf = calloc(1, response.max_msg_size);
c->fc_enable_max = 1;
if (c->receive_buf == NULL) {
res = -ENOMEM;
goto disconnect_and_cleanup;
}
switch (c->request.type) {
case QB_IPC_SHM:
res = qb_ipcc_shm_connect(c, &response);
break;
case QB_IPC_SOCKET:
res = qb_ipcc_us_connect(c, &response);
break;
case QB_IPC_POSIX_MQ:
case QB_IPC_SYSV_MQ:
res = -ENOTSUP;
break;
default:
res = -EINVAL;
break;
}
if (res != 0) {
goto disconnect_and_cleanup;
}
c->is_connected = QB_TRUE;
return c;
disconnect_and_cleanup:
qb_ipcc_us_sock_close(c->setup.u.us.sock);
free(c->receive_buf);
free(c);
errno = -res;
return NULL;
}
static int32_t
_check_connection_state_with(struct qb_ipcc_connection * c, int32_t res,
struct qb_ipc_one_way * one_way,
int32_t ms_timeout, int32_t events)
{
if (res >= 0) return res;
if (qb_ipc_us_sock_error_is_disconnected(res)) {
errno = -res;
qb_util_perror(LOG_DEBUG,
"interpreting result %d as a disconnect",
res);
c->is_connected = QB_FALSE;
}
if (res == -EAGAIN || res == -ETIMEDOUT) {
int32_t res2;
int32_t poll_ms = ms_timeout;
if (res == -ETIMEDOUT) {
poll_ms = 0;
}
res2 = qb_ipc_us_ready(one_way, &c->setup, poll_ms, events);
if (qb_ipc_us_sock_error_is_disconnected(res2)) {
errno = -res2;
qb_util_perror(LOG_DEBUG,
"%s %d %s",
"interpreting result",
res2,
"(from socket) as a disconnect");
c->is_connected = QB_FALSE;
}
res = res2;
}
return res;
}
static int32_t
_check_connection_state(struct qb_ipcc_connection * c, int32_t res)
{
if (res >= 0) return res;
if (qb_ipc_us_sock_error_is_disconnected(res)) {
errno = -res;
qb_util_perror(LOG_DEBUG,
"interpreting result %d as a disconnect",
res);
c->is_connected = QB_FALSE;
}
return res;
}
static struct qb_ipc_one_way *
_event_sock_one_way_get(struct qb_ipcc_connection * c)
{
if (c->needs_sock_for_poll) {
return &c->setup;
}
return &c->event;
}
static struct qb_ipc_one_way *
_response_sock_one_way_get(struct qb_ipcc_connection * c)
{
if (c->needs_sock_for_poll) {
return &c->setup;
}
return &c->response;
}
ssize_t
qb_ipcc_send(struct qb_ipcc_connection * c, const void *msg_ptr, size_t msg_len)
{
ssize_t res;
ssize_t res2;
if (c == NULL) {
return -EINVAL;
}
if (msg_len > c->request.max_msg_size) {
return -EMSGSIZE;
}
if (c->funcs.fc_get) {
res = c->funcs.fc_get(&c->request);
if (res < 0) {
return res;
} else if (res > 0 && res <= c->fc_enable_max) {
return -EAGAIN;
} else {
/*
* we can transmit
*/
}
}
res = c->funcs.send(&c->request, msg_ptr, msg_len);
if (res == msg_len && c->needs_sock_for_poll) {
do {
res2 = qb_ipc_us_send(&c->setup, msg_ptr, 1);
} while (res2 == -EAGAIN);
if (res2 == -EPIPE) {
res2 = -ENOTCONN;
}
if (res2 != 1) {
res = res2;
}
}
return _check_connection_state(c, res);
}
int32_t
qb_ipcc_fc_enable_max_set(struct qb_ipcc_connection * c, uint32_t max)
{
if (c == NULL || max > 2) {
return -EINVAL;
}
c->fc_enable_max = max;
return 0;
}
ssize_t
qb_ipcc_sendv(struct qb_ipcc_connection * c, const struct iovec * iov,
size_t iov_len)
{
int32_t total_size = 0;
int32_t i;
int32_t res;
int32_t res2;
for (i = 0; i < iov_len; i++) {
total_size += iov[i].iov_len;
}
if (c == NULL) {
return -EINVAL;
}
if (total_size > c->request.max_msg_size) {
return -EMSGSIZE;
}
if (c->funcs.fc_get) {
res = c->funcs.fc_get(&c->request);
if (res < 0) {
return res;
} else if (res > 0 && res <= c->fc_enable_max) {
return -EAGAIN;
} else {
/*
* we can transmit
*/
}
}
res = c->funcs.sendv(&c->request, iov, iov_len);
if (res > 0 && c->needs_sock_for_poll) {
do {
res2 = qb_ipc_us_send(&c->setup, &res, 1);
} while (res2 == -EAGAIN);
if (res2 == -EPIPE) {
res2 = -ENOTCONN;
}
if (res2 != 1) {
res = res2;
}
}
return _check_connection_state(c, res);
}
ssize_t
qb_ipcc_recv(struct qb_ipcc_connection * c, void *msg_ptr,
size_t msg_len, int32_t ms_timeout)
{
int32_t res = 0;
if (c == NULL) {
return -EINVAL;
}
res = c->funcs.recv(&c->response, msg_ptr, msg_len, ms_timeout);
return _check_connection_state_with(c, res,
_response_sock_one_way_get(c),
ms_timeout, POLLIN);
}
ssize_t
qb_ipcc_sendv_recv(qb_ipcc_connection_t * c,
const struct iovec * iov, uint32_t iov_len,
void *res_msg, size_t res_len, int32_t ms_timeout)
{
ssize_t res = 0;
int32_t timeout_now;
int32_t timeout_rem = ms_timeout;
if (c == NULL) {
return -EINVAL;
}
if (c->funcs.fc_get) {
res = c->funcs.fc_get(&c->request);
if (res < 0) {
return res;
} else if (res > 0 && res <= c->fc_enable_max) {
return -EAGAIN;
} else {
/*
* we can transmit
*/
}
}
res = qb_ipcc_sendv(c, iov, iov_len);
if (res < 0) {
return res;
}
do {
if (timeout_rem > QB_IPC_MAX_WAIT_MS || ms_timeout == -1) {
timeout_now = QB_IPC_MAX_WAIT_MS;
} else {
timeout_now = timeout_rem;
}
res = qb_ipcc_recv(c, res_msg, res_len, timeout_now);
if (res == -ETIMEDOUT) {
if (ms_timeout < 0) {
res = -EAGAIN;
} else {
timeout_rem -= timeout_now;
if (timeout_rem > 0) {
res = -EAGAIN;
}
}
} else if (res < 0 && res != -EAGAIN) {
errno = -res;
qb_util_perror(LOG_DEBUG,
"qb_ipcc_recv %d timeout:(%d/%d)",
res, timeout_now, timeout_rem);
}
} while (res == -EAGAIN && c->is_connected);
return res;
}
int32_t
qb_ipcc_fd_get(struct qb_ipcc_connection * c, int32_t * fd)
{
if (c == NULL) {
return -EINVAL;
}
if (c->event.type == QB_IPC_SOCKET) {
*fd = c->event.u.us.sock;
} else {
*fd = c->setup.u.us.sock;
}
return 0;
}
ssize_t
qb_ipcc_event_recv(struct qb_ipcc_connection * c, void *msg_pt,
size_t msg_len, int32_t ms_timeout)
{
char one_byte = 1;
int32_t res;
ssize_t size;
if (c == NULL) {
return -EINVAL;
}
res = _check_connection_state_with(c, -EAGAIN, _event_sock_one_way_get(c),
ms_timeout, POLLIN);
if (res < 0) {
return res;
}
size = c->funcs.recv(&c->event, msg_pt, msg_len, ms_timeout);
if (size > 0 && c->needs_sock_for_poll) {
res = qb_ipc_us_recv(&c->setup, &one_byte, 1, -1);
if (res != 1) {
size = res;
}
}
return _check_connection_state(c, size);
}
void
qb_ipcc_disconnect(struct qb_ipcc_connection *c)
{
struct qb_ipc_one_way *ow = NULL;
qb_util_log(LOG_DEBUG, "%s()", __func__);
if (c == NULL) {
return;
}
ow = _event_sock_one_way_get(c);
(void)_check_connection_state_with(c, -EAGAIN, ow, 0, POLLIN);
if (c->funcs.disconnect) {
c->funcs.disconnect(c);
}
free(c->receive_buf);
free(c);
}
void
qb_ipcc_context_set(struct qb_ipcc_connection *c, void *context)
{
if (c == NULL) {
return;
}
c->context = context;
}
void *qb_ipcc_context_get(struct qb_ipcc_connection *c)
{
if (c == NULL) {
return NULL;
}
return c->context;
}
int32_t
qb_ipcc_is_connected(qb_ipcc_connection_t *c)
{
struct qb_ipc_one_way *ow;
if (c == NULL) {
return QB_FALSE;
}
ow = _response_sock_one_way_get(c);
(void)_check_connection_state_with(c, -EAGAIN, ow, 0, POLLIN);
return c->is_connected;
}
int32_t
qb_ipcc_get_buffer_size(qb_ipcc_connection_t * c)
{
if (c == NULL) {
return -EINVAL;
}
return c->event.max_msg_size;
}