3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author João Luis M. Assirati
8 * Full author contact details are available in file CREDITS.
13 #include "socktools.h"
17 #include <sys/socket.h>
34 // Returns a local socket already in the "listen" state (or -1 in case
35 // of error). The first argument is the socket address, the second
36 // is the length of the queue for connections. If successful, a socket
37 // special file 'name' will be created in the filesystem.
38 int listen(string const & name, int queue)
40 int fd; // File descriptor for the socket
41 sockaddr_un addr; // Structure that hold the socket address
43 // We use 'name' to fill 'addr'
44 string::size_type len = name.size();
45 // the field sun_path in sockaddr_un is a char[108]
47 lyxerr << "lyx: Socket address '" << name << "' too long."
51 // Synonims for AF_UNIX are AF_LOCAL and AF_FILE
52 addr.sun_family = AF_UNIX;
53 name.copy(addr.sun_path, 107);
54 addr.sun_path[len] = '\0';
56 // This creates a file descriptor for the socket
57 // Synonims for PF_UNIX are PF_LOCAL and PF_FILE
58 // For local sockets, the protocol is always 0
59 // socket() returns -1 in case of error
60 if ((fd = ::socket(PF_UNIX, SOCK_STREAM, 0))== -1) {
61 lyxerr << "lyx: Could not create socket descriptor: "
62 << strerror(errno) << endl;
66 // Set NONBLOCK mode for the file descriptor
67 if (::fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
68 lyxerr << "lyx: Could not set NONBLOCK mode for socket descriptor: "
69 << strerror(errno) << endl;
74 // bind() gives the local address 'name' for 'fd', also creating
75 // the socket special file in the filesystem. bind() returns -1
77 if ((::bind (fd, reinterpret_cast<sockaddr *>(&addr), SUN_LEN(&addr))) == -1) {
78 lyxerr << "lyx: Could not bind address '" << name
79 << "' to socket descriptor: " << strerror(errno) << endl;
81 lyx::support::unlink(name);
85 // Puts the socket in listen state, that is, ready to accept
86 // connections. The second parameter of listen() defines the
87 // maximum length the queue of pending connections may grow to.
88 // It is not a restriction on the number of connections the socket
89 // can accept. Returns -1 in case of error
90 if (::listen (fd, queue) == -1) {
91 lyxerr << "lyx: Could not put socket in 'listen' state: "
92 << strerror(errno) << endl;
94 lyx::support::unlink(name);
101 // Returns a file descriptor for a new connection from the socket
102 // descriptor 'sd' (or -1 in case of error)
107 // Returns the new file descriptor or -1 in case of error
108 // Using null pointers for the second and third arguments
109 // dismiss all information about the connecting client
110 if ((fd = accept(sd, reinterpret_cast<sockaddr *>(0), reinterpret_cast<socklen_t *>(0))) == -1) {
111 lyxerr << "lyx: Could not accept connection: "
112 << strerror(errno) << endl;
116 // Sets NONBLOCK mode for the file descriptor
117 if (::fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
118 lyxerr << "lyx: Could not set NONBLOCK mode for connection: "
119 << strerror(errno) << endl;
126 } // namespace socktools
127 } // namespace support