1/* libs/cutils/socket_loopback_server.c
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#include <cutils/sockets.h>
19
20#include <stdlib.h>
21#include <string.h>
22#include <unistd.h>
23#include <errno.h>
24#include <stddef.h>
25
26#define LISTEN_BACKLOG 4
27
28#ifndef HAVE_WINSOCK
29#include <sys/socket.h>
30#include <sys/select.h>
31#include <sys/types.h>
32#include <netinet/in.h>
33#endif
34
35/* open listen() port on loopback interface */
36int socket_loopback_server(int port, int type)
37{
38    struct sockaddr_in addr;
39    size_t alen;
40    int s, n;
41
42    memset(&addr, 0, sizeof(addr));
43    addr.sin_family = AF_INET;
44    addr.sin_port = htons(port);
45    addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
46
47    s = socket(AF_INET, type, 0);
48    if(s < 0) return -1;
49
50    n = 1;
51    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n));
52
53    if(bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
54        close(s);
55        return -1;
56    }
57
58    if (type == SOCK_STREAM) {
59        int ret;
60
61        ret = listen(s, LISTEN_BACKLOG);
62
63        if (ret < 0) {
64            close(s);
65            return -1;
66        }
67    }
68
69    return s;
70}
71
72