2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * recvclient.c: Receive input from the client
29 * Known contributors to this file:
31 * Markus Armbruster, 2006-2009
32 * Ron Koenderink, 2009
40 #include "prototypes.h"
43 * Receive a line of input from the current player.
44 * If the player's eof flag is set, return -1 without receiving input.
45 * If the player's aborted flag is set, return -2 without receiving
47 * Else receive one line and store it in CMD[SIZE].
48 * This may block for input, yielding the processor. Flush buffered
49 * output when blocking, to make sure player sees the prompt.
50 * If the player's connection has the I/O error or EOF indicator set,
51 * or the line is "ctld", set the player's eof and aborted flag and
53 * If the line is "aborted", set the player's aborted flag and return
55 * Else return the length of the line.
56 * Design bug: there is no way to indicate truncation of a long line.
59 recvclient(char *cmd, int size)
64 while (!player->aborted) {
65 /* Try to get a line of input */
66 count = io_gets(player->iop, cmd, size);
69 if (strcmp(cmd, "ctld") == 0)
70 player->aborted = player->eof = 1;
71 if (strcmp(cmd, "aborted") == 0)
78 * Flush all queued output before potentially sleeping in
79 * io_input(), to make sure player sees the prompt.
81 while (io_output(player->iop,
82 player->may_sleep >= PLAYER_SLEEP_ON_INPUT) > 0)
86 * If io_output_all() blocked and got unblocked by command
87 * abortion, we must return without blocking in io_input().
92 res = io_input(player->iop, 1);
96 player->aborted = player->eof = 1;
97 else if (io_eof(player->iop))
98 player->aborted = player->eof = 1;
99 else if (!player->aborted) {
100 pr_flash(player, "idle connection terminated\n");
101 player->aborted = player->eof = 1;
105 if (player->aborted) {
107 if (player->recvfail > 255) {
109 * Looks like the thread is stuck in a loop that fails to
110 * check errors; oops once, then slow it down drastically.
112 CANT_HAPPEN(player->recvfail == 256);
113 empth_sleep(time(NULL) + 60);
115 return player->eof ? -1 : -2;
118 player->recvfail = 0;