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/**
* mds — A micro-display server
* Copyright © 2014, 2015, 2016, 2017 Mattias Andrée (maandree@kth.se)
*
* 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 "slavery.h"
#include "globals.h"
#include "client.h"
#include <libmdsserver/macros.h>
#include <libmdsserver/linked-list.h>
#include <pthread.h>
#include <stdint.h>
#include <errno.h>
#include <stdio.h>
/**
* Master function for slave threads
*
* @param data Input data
* @return Outout data
*/
void *slave_loop(void *);
/**
* Receive a full message and update open status if the client closes
*
* @param client The client
* @return Zero on success, -2 on failure, otherwise -1
*/
int
fetch_message(client_t *client)
{
int r = mds_message_read(&(client->message), client->socket_fd);
if (!r) {
return 0;
} else if (r == -2) {
eprint("corrupt message received.");
fail_if (1);
} else if (errno == ECONNRESET) {
r = mds_message_read(&(client->message), client->socket_fd);
client->open = 0;
/* Connection closed. */
} else if (errno != EINTR) {
xperror(*argv);
fail_if (1);
}
fail_if (r == -2);
return r;
fail:
return -2;
}
/**
* Create, start and detache a slave thread
*
* @param thread The address at where to store the thread
* @param slave_fd The file descriptor of the slave's socket
* @return Zero on success, -1 on error, error message will have been printed
*/
int
create_slave(pthread_t *thread_slot, int slave_fd)
{
if ((errno = pthread_create(thread_slot, NULL, slave_loop, (void *)(intptr_t)slave_fd))) {
xperror(*argv);
with_mutex (slave_mutex, running_slaves--;);
fail_if (1);
}
if ((errno = pthread_detach(*thread_slot))) {
xperror(*argv);
fail_if (1);
}
return 0;
fail:
return -1;
}
/**
* Initialise a client, except for threading
*
* @param client_fd The file descriptor of the client's socket
* @return The client information, `NULL` on error
*/
client_t *
initialise_client(int client_fd)
{
ssize_t entry = LINKED_LIST_UNUSED;
client_t *information;
int locked = 0, saved_errno;
size_t tmp;
/* Create information table. */
fail_if (xmalloc(information, 1, client_t));
client_initialise(information);
/* Add to list of clients. */
fail_if ((errno = pthread_mutex_lock(&slave_mutex)));
locked = 1;
entry = linked_list_insert_end(&client_list, (size_t)(void *)information);
fail_if (entry == LINKED_LIST_UNUSED);
/* Add client to table. */
tmp = fd_table_put(&client_map, client_fd, (size_t)(void *)information);
fail_if (!tmp && errno);
pthread_mutex_unlock(&slave_mutex);
locked = 0;
/* Fill information table. */
information->list_entry = entry;
information->socket_fd = client_fd;
information->open = 1;
fail_if (mds_message_initialise(&(information->message)));
return information;
fail:
saved_errno = errno;
if (locked)
pthread_mutex_unlock(&slave_mutex);
free(information);
if (entry != LINKED_LIST_UNUSED)
with_mutex (slave_mutex, linked_list_remove(&client_list, entry););
return errno = saved_errno, NULL;
}
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