/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
- * Ken Stevens, Steve McClure
+ * Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Ken Stevens, Steve McClure, Markus Armbruster
*
- * This program is free software; you can redistribute it and/or modify
+ * Empire 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 2 of the License, or
+ * 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,
* 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* ---
*
- * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- * related information and legal notices. It is expected that any future
- * projects/authors will amend these files as needed.
+ * See files README, COPYING and CREDITS in the root of the source
+ * tree for related information and legal notices. It is expected
+ * that future projects/authors will amend these files as needed.
*
* ---
*
- * recvclient.c: Send and receive commands from the client
- *
+ * recvclient.c: Receive input from the client
+ *
* Known contributors to this file:
* Dave Pare, 1986
+ * Markus Armbruster, 2006-2012
+ * Ron Koenderink, 2009
*/
-#include "prototypes.h"
-#include <stdio.h>
-#include "misc.h"
+#include <config.h>
+
#include "empio.h"
+#include "journal.h"
+#include "optlist.h"
#include "player.h"
-#include "empthread.h"
+#include "prototypes.h"
+/*
+ * Receive a line of input from the current player.
+ * If the player's aborted flag is set, return -1 without receiving
+ * input.
+ * Else receive one line and store it in CMD[SIZE].
+ * This may block for input, yielding the processor. Flush buffered
+ * output when blocking, to make sure player sees the prompt.
+ * If the player's connection has the I/O error or EOF indicator set,
+ * or the line is "aborted", set the player's aborted flag and return
+ * -1.
+ * If we block and time out, set the EOF indicator on the player's
+ * connection, set the player's aborted flag, and return -1.
+ * If the line is "ctld", set the player's eof and aborted flag and
+ * return -1.
+ * Else return the length of the line.
+ * Design bug: there is no way to indicate truncation of a long line.
+ */
int
-recvclient(s_char *cmd, int size)
+recvclient(char *cmd, int size)
{
- int count;
+ int count, res;
+ struct timeval timeout;
+
+ count = -1;
+ while (!player->aborted) {
+ /* Try to get a line of input */
+ count = io_gets(player->iop, cmd, size);
+ if (count >= 0) {
+ /* got it */
+ if (strcmp(cmd, "ctld") == 0)
+ player->aborted = player->got_ctld = 1;
+ if (strcmp(cmd, "aborted") == 0)
+ player->aborted = 1;
+ journal_input(cmd);
+ break;
+ }
+
+ /*
+ * Flush all queued output before potentially sleeping in
+ * io_input(), to make sure player sees the prompt.
+ */
+ while (io_output(player->iop,
+ player->may_sleep >= PLAYER_SLEEP_ON_INPUT) > 0)
+ ;
- if (player->aborted)
- return -2;
- count = io_gets(player->iop, cmd, size);
- while (!player->aborted && count < 0) {
- io_output_all(player->iop);
- io_input(player->iop, IO_WAIT);
- if (io_error(player->iop))
- player->aborted++;
+ /*
+ * If io_output() blocked and got unblocked by command
+ * abortion, we must return without blocking in io_input().
+ */
+ if (player->aborted)
+ break;
+
+ timeout.tv_sec = minutes(max_idle);
+ timeout.tv_usec = 0;
+ res = io_input(player->iop, &timeout);
+ if (res > 0)
+ ;
+ else if (res < 0)
+ player->aborted = 1;
else if (io_eof(player->iop))
- return -1;
- else
- count = io_gets(player->iop, cmd, size);
- }
- if (count > 0) {
- if (strcmp(cmd, "ctld") == 0)
- return -1;
- if (strcmp(cmd, "aborted") == 0)
player->aborted = 1;
+ else if (!player->aborted) {
+ pr_flash(player, "idle connection terminated\n");
+ io_set_eof(player->iop);
+ player->aborted = 1;
+ }
}
- if (player->aborted)
- return -2;
+
+ if (player->aborted) {
+ player->recvfail++;
+ if (player->recvfail > 255) {
+ /*
+ * Looks like the thread is stuck in a loop that fails to
+ * check errors; oops once, then slow it down drastically.
+ */
+ CANT_HAPPEN(player->recvfail == 256);
+ empth_sleep(time(NULL) + 60);
+ }
+ return -1;
+ }
+
+ player->recvfail = 0;
return count;
}