2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2018, 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, 2006-2015
32 * Ron Koenderink, 2009
41 #include "prototypes.h"
44 * Receive a line of input from the current player.
45 * If the player's aborted flag is set, return -1 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 "aborted", set the player's aborted flag and return
53 * If we block and time out, set the EOF indicator on the player's
54 * connection, set the player's aborted flag, and return -1.
55 * If the line is "ctld", set the player's eof and aborted flag and
57 * Else return the length of the line.
58 * Design bug: there is no way to indicate truncation of a long line.
61 recvclient(char *cmd, int size)
67 while (!player->aborted) {
68 /* Try to get a line of input */
69 count = io_gets(player->iop, cmd, size);
72 if (player_io_deadline(player, 0))
74 if (strcmp(cmd, "ctld") == 0)
75 player->aborted = player->got_ctld = 1;
76 if (strcmp(cmd, "aborted") == 0)
83 * Flush all queued output before potentially sleeping in
84 * io_input(), to make sure player sees the prompt.
86 deadline = player_io_deadline(player, 0);
87 while (io_output(player->iop, deadline) > 0)
91 * Try to receive some input. Need to recompute deadline;
92 * command abortion during io_output() might have changed it.
94 deadline = player_io_deadline(player, 0);
95 res = io_input(player->iop, deadline);
100 else if (io_eof(player->iop))
102 else if (!player->aborted) {
103 pr_flash(player, "idle connection terminated\n");
104 io_set_eof(player->iop);
109 if (player->aborted) {
111 if (player->recvfail > 255) {
113 * Looks like the thread is stuck in a loop that fails to
114 * check errors; oops once, then slow it down drastically.
116 CANT_HAPPEN(player->recvfail == 256);
117 empth_sleep(time(NULL) + 60);
122 player->recvfail = 0;