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/*
* Usurpation – null (stdio) im proto
*
* Copyright (C) 2019 Gediminas Jakutis
* Copyright (C) 2019 Paulius Ratkevičius
*
* This program 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; version 2.1
* of the License.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <errno.h>
#include "proto_stdio.h"
#include "proto_stdio_private.h"
void message_receive(char *arg)
{
int cancelstate;
int done = 0;
while (!done) {
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancelstate);
pthread_mutex_lock(&state.out_m);
if (!state.writebuf) {
state.writebuf = strdup(arg);
done = 1;
}
pthread_mutex_unlock(&state.out_m);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &cancelstate);
pthread_testcancel();
}
}
char *message_send(void)
{
char *ret;
int cancelstate;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancelstate);
pthread_mutex_lock(&state.out_m);
ret = strdup(state.readbuf);
free(state.readbuf);
state.readbuf = NULL;
state.readbufsize = 0;
pthread_mutex_unlock(&state.out_m);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &cancelstate);
pthread_testcancel();
return ret;
}
static void *read_stdin(void *arg)
{
int cancelstate;
(void) arg;
while(1) {
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancelstate);
pthread_mutex_lock(&state.in_m);
if (!state.readbuf) {
state.readbufsize = getline(&state.readbuf, NULL, stdin);
}
pthread_mutex_unlock(&state.in_m);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &cancelstate);
pthread_testcancel();
nanosleep(&respite, NULL);
}
return NULL;
}
static void *write_stdout(void *arg)
{
int cancelstate;
(void) arg;
while(1) {
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancelstate);
pthread_mutex_lock(&state.out_m);
if (state.writebuf) {
if (state.writebuf[strlen(state.writebuf) - 1] == '\n') {
printf("%s", state.writebuf);
} else {
printf("%s\n", state.writebuf);
}
free(state.writebuf);
state.writebuf = NULL;
state.writebufsize = 0;
}
pthread_mutex_unlock(&state.out_m);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &cancelstate);
pthread_testcancel();
nanosleep(&respite, NULL);
}
return NULL;
}
int proto_stdio_init(void)
{
int ret = 0;
/* aquire the """singleton""" mutex */
if (pthread_mutex_trylock(&state.mutex)) {
/* TODO: use proper error numbers */
ret = 1;
} else {
if ((ret = pthread_create(&state.stdio_in, NULL, read_stdin, NULL))) {
proto_stdio_close();
}
if ((ret = pthread_create(&state.stdio_out, NULL, write_stdout, NULL))) {
proto_stdio_close();
}
}
return ret;
}
void proto_stdio_close(void)
{
if (pthread_mutex_trylock(&state.mutex) == EBUSY) {
pthread_cancel(state.stdio_in);
pthread_cancel(state.stdio_out);
pthread_join(state.stdio_in, NULL);
pthread_join(state.stdio_out, NULL);
}
pthread_mutex_unlock(&state.mutex);
}
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