2 * Copyright (c) 2015 George V. Neville-Neil
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/socket.h>
37 #include <sys/types.h>
38 #include <netinet/in.h>
40 #define PORT 6969 /* Default port */
41 #define LISTEN 5 /* Default backlog */
42 #define RECV_LIMIT 64 /* When do we move listen to 0? */
48 err(EX_USAGE, "listen [-p port] [-l limit]\n");
51 int main(int argc, char **argv)
54 int ch, srv_sock, cli_sock, recvd = 0;
57 struct sockaddr_in localaddr;
59 while ((ch = getopt(argc, argv, "p:l:")) != -1) {
73 bzero(&localaddr, sizeof(localaddr));
74 localaddr.sin_len = sizeof(localaddr);
75 localaddr.sin_family = AF_INET;
76 localaddr.sin_port = htons(port);
77 localaddr.sin_addr.s_addr = INADDR_ANY;
79 srv_sock = socket(AF_INET, SOCK_STREAM, 0);
81 if (bind(srv_sock, (struct sockaddr *)&localaddr,
82 sizeof(struct sockaddr_in)) < 0)
83 err(EX_OSERR, "Could not bind to INADDR_ANY:%d", port);
85 if (listen(srv_sock, limit) < 0)
86 err(EX_OSERR, "Failed to listen with depth of %d\n", limit);
88 while (((cli_sock = accept(srv_sock, NULL, NULL)) >= 0)
89 && (recvd < RECV_LIMIT)) {
96 while (((cli_sock = accept(srv_sock, NULL, NULL)) >= 0)
97 && (recvd <= (RECV_LIMIT + limit + 1))) {
102 if (accept(srv_sock, NULL, NULL) >= 0)
103 printf ("Late connection at %d\n", recvd);
105 printf("recvd %d\n", recvd);