2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * recvclient.c: Receive input from the client
30 * Known contributors to this file:
32 * Markus Armbruster, 2006-2009
33 * Ron Koenderink, 2009
41 #include "prototypes.h"
44 * Receive a line of input from the current player.
45 * If the player's eof flag is set, return -1 without receiving input.
46 * If the player's aborted flag is set, return -2 without receiving
48 * Else receive one line and store it in CMD[SIZE].
49 * This may block for input, yielding the processor. Flush buffered
50 * output when blocking, to make sure player sees the prompt.
51 * If the player's connection has the I/O error or EOF indicator set,
52 * or the line is "ctld", set the player's eof and aborted flag and
54 * If the line is "aborted", set the player's aborted flag and return
56 * Else return the length of the line.
57 * Design bug: there is no way to indicate truncation of a long line.
60 recvclient(char *cmd, int size)
65 while (!player->aborted) {
66 /* Try to get a line of input */
67 count = io_gets(player->iop, cmd, size);
70 if (strcmp(cmd, "ctld") == 0)
71 player->aborted = player->eof = 1;
72 if (strcmp(cmd, "aborted") == 0)
79 * Flush all queued output before potentially sleeping in
80 * io_input(), to make sure player sees the prompt.
82 while (io_output(player->iop,
83 player->may_sleep >= PLAYER_SLEEP_ON_INPUT) > 0)
87 * If io_output_all() blocked and got unblocked by command
88 * abortion, we must return without blocking in io_input().
93 res = io_input(player->iop, 1);
97 player->aborted = player->eof = 1;
98 else if (io_eof(player->iop))
99 player->aborted = player->eof = 1;
100 else if (!player->aborted) {
101 pr_flash(player, "idle connection terminated\n");
102 player->aborted = player->eof = 1;
106 if (player->aborted) {
108 if (player->recvfail > 255) {
110 * Looks like the thread is stuck in a loop that fails to
111 * check errors; oops once, then slow it down drastically.
113 CANT_HAPPEN(player->recvfail == 256);
114 empth_sleep(time(NULL) + 60);
116 return player->eof ? -1 : -2;
119 player->recvfail = 0;