+/* return value: 0 = subbuffer is finished, it won't produce data anymore
+ * 1 = got subbuffer successfully
+ * <0 = error
+ */
+
+int get_subbuffer(struct buffer_info *buf)
+{
+ char *send_msg;
+ char *received_msg;
+ char *rep_code;
+ int retval;
+ int result;
+
+ asprintf(&send_msg, "get_subbuffer %s", buf->name);
+ result = send_message(buf->pid, send_msg, &received_msg);
+ if(result < 0) {
+ ERR("get_subbuffer: send_message failed");
+ return -1;
+ }
+ free(send_msg);
+
+ result = sscanf(received_msg, "%as %ld", &rep_code, &buf->consumed_old);
+ if(result != 2 && result != 1) {
+ ERR("unable to parse response to get_subbuffer");
+ return -1;
+ }
+
+ DBG("received msg is %s", received_msg);
+
+ if(!strcmp(rep_code, "OK")) {
+ DBG("got subbuffer %s", buf->name);
+ retval = 1;
+ }
+ else if(nth_token_is(received_msg, "END", 0) == 1) {
+ return 0;
+ }
+ else {
+ DBG("error getting subbuffer %s", buf->name);
+ retval = -1;
+ }
+
+ /* FIMXE: free correctly the stuff */
+ free(received_msg);
+ free(rep_code);
+ return retval;
+}
+
+int put_subbuffer(struct buffer_info *buf)
+{
+ char *send_msg;
+ char *received_msg;
+ char *rep_code;
+ int retval;
+ int result;
+
+ asprintf(&send_msg, "put_subbuffer %s %ld", buf->name, buf->consumed_old);
+ result = send_message(buf->pid, send_msg, &received_msg);
+ if(result < 0) {
+ ERR("put_subbuffer: send_message failed");
+ return -1;
+ }
+ free(send_msg);
+
+ result = sscanf(received_msg, "%as", &rep_code);
+ if(result != 1) {
+ ERR("unable to parse response to put_subbuffer");
+ return -1;
+ }
+ free(received_msg);
+
+ if(!strcmp(rep_code, "OK")) {
+ DBG("subbuffer put %s", buf->name);
+ retval = 1;
+ }
+ else {
+ ERR("invalid response to put_subbuffer");
+ }
+
+ free(rep_code);
+ return retval;
+}
+
+ssize_t patient_write(int fd, const void *buf, size_t count)
+{
+ const char *bufc = (const char *) buf;
+ int result;
+
+ for(;;) {
+ result = write(fd, bufc, count);
+ if(result <= 0) {
+ return result;
+ }
+ count -= result;
+ bufc += result;
+
+ if(count == 0) {
+ break;
+ }
+ }
+
+ return bufc-(const char *)buf;
+}
+
+void *consumer_thread(void *arg)
+{
+ struct buffer_info *buf = (struct buffer_info *) arg;
+ int result;
+
+ for(;;) {
+ result = get_subbuffer(buf);
+ if(result == -1) {
+ ERR("error getting subbuffer");
+ continue;
+ }
+ if(result == 0) {
+ /* this is done */
+ break;
+ }
+
+ /* write data to file */
+ result = patient_write(buf->file_fd, buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1)), buf->subbuf_size);
+ if(result == -1) {
+ PERROR("write");
+ /* FIXME: maybe drop this trace */
+ }
+
+ result = put_subbuffer(buf);
+ if(result == -1) {
+ ERR("error putting subbuffer");
+ break;
+ }
+ }
+
+ DBG("thread for buffer %s is stopping", buf->name);
+
+ return NULL;
+}
+