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15637ed4 RG |
1 | .\" Copyright (c) 1986 The Regents of the University of California. |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" Redistribution and use in source and binary forms, with or without | |
5 | .\" modification, are permitted provided that the following conditions | |
6 | .\" are met: | |
7 | .\" 1. Redistributions of source code must retain the above copyright | |
8 | .\" notice, this list of conditions and the following disclaimer. | |
9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer in the | |
11 | .\" documentation and/or other materials provided with the distribution. | |
12 | .\" 3. All advertising materials mentioning features or use of this software | |
13 | .\" must display the following acknowledgement: | |
14 | .\" This product includes software developed by the University of | |
15 | .\" California, Berkeley and its contributors. | |
16 | .\" 4. Neither the name of the University nor the names of its contributors | |
17 | .\" may be used to endorse or promote products derived from this software | |
18 | .\" without specific prior written permission. | |
19 | .\" | |
20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | .\" SUCH DAMAGE. | |
31 | .\" | |
32 | .\" @(#)strchkread.c 6.4 (Berkeley) 4/17/91 | |
33 | .\" | |
34 | #include <sys/types.h> | |
35 | #include <sys/socket.h> | |
36 | #include <sys/time.h> | |
37 | #include <netinet/in.h> | |
38 | #include <netdb.h> | |
39 | #include <stdio.h> | |
40 | #define TRUE 1 | |
41 | ||
42 | /* | |
43 | * This program uses select() to check that someone is trying to connect | |
44 | * before calling accept(). | |
45 | */ | |
46 | ||
47 | main() | |
48 | { | |
49 | int sock, length; | |
50 | struct sockaddr_in server; | |
51 | int msgsock; | |
52 | char buf[1024]; | |
53 | int rval; | |
54 | fd_set ready; | |
55 | struct timeval to; | |
56 | ||
57 | /* Create socket */ | |
58 | sock = socket(AF_INET, SOCK_STREAM, 0); | |
59 | if (sock < 0) { | |
60 | perror("opening stream socket"); | |
61 | exit(1); | |
62 | } | |
63 | /* Name socket using wildcards */ | |
64 | server.sin_family = AF_INET; | |
65 | server.sin_addr.s_addr = INADDR_ANY; | |
66 | server.sin_port = 0; | |
67 | if (bind(sock, &server, sizeof(server))) { | |
68 | perror("binding stream socket"); | |
69 | exit(1); | |
70 | } | |
71 | /* Find out assigned port number and print it out */ | |
72 | length = sizeof(server); | |
73 | if (getsockname(sock, &server, &length)) { | |
74 | perror("getting socket name"); | |
75 | exit(1); | |
76 | } | |
77 | printf("Socket has port #%d\en", ntohs(server.sin_port)); | |
78 | ||
79 | /* Start accepting connections */ | |
80 | listen(sock, 5); | |
81 | do { | |
82 | FD_ZERO(&ready); | |
83 | FD_SET(sock, &ready); | |
84 | to.tv_sec = 5; | |
85 | if (select(sock + 1, &ready, 0, 0, &to) < 0) { | |
86 | perror("select"); | |
87 | continue; | |
88 | } | |
89 | if (FD_ISSET(sock, &ready)) { | |
90 | msgsock = accept(sock, (struct sockaddr *)0, (int *)0); | |
91 | if (msgsock == -1) | |
92 | perror("accept"); | |
93 | else do { | |
94 | bzero(buf, sizeof(buf)); | |
95 | if ((rval = read(msgsock, buf, 1024)) < 0) | |
96 | perror("reading stream message"); | |
97 | else if (rval == 0) | |
98 | printf("Ending connection\en"); | |
99 | else | |
100 | printf("-->%s\en", buf); | |
101 | } while (rval > 0); | |
102 | close(msgsock); | |
103 | } else | |
104 | printf("Do something else\en"); | |
105 | } while (TRUE); | |
106 | } |