0001    /**
0002     * Copyright IBM Corporation 2016
0003     *
0004     * Licensed under the Apache License, Version 2.0 (the "License");
0005     * you may not use this file except in compliance with the License.
0006     * You may obtain a copy of the License at
0007     *
0008     * http://www.apache.org/licenses/LICENSE-2.0
0009     *
0010     * Unless required by applicable law or agreed to in writing, software
0011     * distributed under the License is distributed on an "AS IS" BASIS,
0012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0013     * See the License for the specific language governing permissions and
0014     * limitations under the License.
0015     **/
0016    
0017    /**
0018    * Creates a simple HTTP server that listens for incoming connections on port 9080.
0019    * For each request receieved, the server simply sends a simple hello world message
0020    * back to the client.
0021    **/
0022    
0023    #if os(Linux)
0024    import Glibc
0025    #else
0026    import Darwin
0027    #endif
0028    import Utils
0029    
0030    // Create server socket
0031    let address
main.swift:32
let server_sockfd = createSocket(address)
main.swift:36
print("Server is listening on port: \(address.port)\n")
 = parseAddress()
0032    let server_sockfd
main.swift:34
listen(server_sockfd, 5)
main.swift:39
fdSet(server_sockfd, set: &active_fd_set)
main.swift:55
      if i == server_sockfd {
main.swift:60
          var client_sockfd = accept(server_sockfd,
 = createSocket(address)
0033    // Listen on socket with queue of 5
0034    listen(server_sockfd, 5)
0035    var active_fd_set
main.swift:39
fdSet(server_sockfd, set: &active_fd_set)
main.swift:50
  var read_fd_set = active_fd_set;
main.swift:64
            fdSet(client_sockfd, set: &active_fd_set)
main.swift:72
        fdClr(i, set: &active_fd_set)
 = fd_set()
0036    print("Server is listening on port: \(address.port)\n")
0037    
0038    // Initialize the set of active sockets
0039    fdSet(server_sockfd, set: &active_fd_set)
0040    
0041    let FD_SETSIZE
main.swift:51
  select(FD_SETSIZE, &read_fd_set, nil, nil, nil)
main.swift:53
  for i in 0..<FD_SETSIZE {
 = Int32(1024)
0042    
0043    let httpResponse
main.swift:69
        write(i, httpResponse, httpResponse.characters.count)
main.swift:69
        write(i, httpResponse, httpResponse.characters.count)
 = "HTTP/1.0 200 OK\n" +
0044      "Content-Type: text/html\n\n" +
0045      "<html><body>Hello from Swift on Linux!</body></html>"
0046    
0047    var clientname
main.swift:59
        withUnsafeMutablePointers(&clientname, &size) { up1, up2 in
main.swift:63
            print("Received connection request from client: " + String(inet_ntoa (clientname.sin_addr)) + ", port " + String(UInt16(clientname.sin_port).bigEndian))
main.swift:63
            print("Received connection request from client: " + String(inet_ntoa (clientname.sin_addr)) + ", port " + String(UInt16(clientname.sin_port).bigEndian))
 = sockaddr_in()
0048    while true {
0049      // Block until input arrives on one or more active sockets
0050      var read_fd_set = active_fd_set;
0051      select(FD_SETSIZE, &read_fd_set, nil, nil, nil)
0052      // Service all the sockets with input pending
0053      for i in 0..<FD_SETSIZE {
0054        if fdIsSet(i,set: &read_fd_set) {
0055          if i == server_sockfd {
0056            // Connection request on original socket
0057            var size = sizeof(sockaddr_in)
0058            // Accept request and assign socket
0059            withUnsafeMutablePointers(&clientname, &size) { up1, up2 in
0060              var client_sockfd = accept(server_sockfd,
0061                UnsafeMutablePointer(up1),
0062                UnsafeMutablePointer(up2))
0063                print("Received connection request from client: " + String(inet_ntoa (clientname.sin_addr)) + ", port " + String(UInt16(clientname.sin_port).bigEndian))
0064                fdSet(client_sockfd, set: &active_fd_set)
0065            }
0066          }
0067          else {
0068            // Send HTTP response back to client
0069            write(i, httpResponse, httpResponse.characters.count)
0070            // Close client socket
0071            close(i)
0072            fdClr(i, set: &active_fd_set)
0073          }
0074        }
0075      }
0076    }
0077