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>
29 // This MACRO eppears to be defined only on Linux.
32 (sizeof (*(su)) - sizeof ((su)->sun_path) + strlen((su)->sun_path))
40 // Returns a local socket already in the "listen" state (or -1 in case
41 // of error). The first argument is the socket address, the second
42 // is the length of the queue for connections. If successful, a socket
43 // special file 'name' will be created in the filesystem.
44 int listen(string const & name, int queue)
46 int fd; // File descriptor for the socket
47 sockaddr_un addr; // Structure that hold the socket address
49 // We use 'name' to fill 'addr'
50 string::size_type len = name.size();
51 // the field sun_path in sockaddr_un is a char[108]
53 lyxerr << "lyx: Socket address '" << name << "' too long."
57 // Synonims for AF_UNIX are AF_LOCAL and AF_FILE
58 addr.sun_family = AF_UNIX;
59 name.copy(addr.sun_path, 107);
60 addr.sun_path[len] = '\0';
62 // This creates a file descriptor for the socket
63 // Synonims for PF_UNIX are PF_LOCAL and PF_FILE
64 // For local sockets, the protocol is always 0
65 // socket() returns -1 in case of error
66 if ((fd = ::socket(PF_UNIX, SOCK_STREAM, 0))== -1) {
67 lyxerr << "lyx: Could not create socket descriptor: "
68 << strerror(errno) << endl;
72 // Set NONBLOCK mode for the file descriptor
73 if (::fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
74 lyxerr << "lyx: Could not set NONBLOCK mode for socket descriptor: "
75 << strerror(errno) << endl;
80 // bind() gives the local address 'name' for 'fd', also creating
81 // the socket special file in the filesystem. bind() returns -1
83 if ((::bind (fd, reinterpret_cast<sockaddr *>(&addr), SUN_LEN(&addr))) == -1) {
84 lyxerr << "lyx: Could not bind address '" << name
85 << "' to socket descriptor: " << strerror(errno) << endl;
87 lyx::support::unlink(name);
91 // Puts the socket in listen state, that is, ready to accept
92 // connections. The second parameter of listen() defines the
93 // maximum length the queue of pending connections may grow to.
94 // It is not a restriction on the number of connections the socket
95 // can accept. Returns -1 in case of error
96 if (::listen (fd, queue) == -1) {
97 lyxerr << "lyx: Could not put socket in 'listen' state: "
98 << strerror(errno) << endl;
100 lyx::support::unlink(name);
107 // Returns a file descriptor for a new connection from the socket
108 // descriptor 'sd' (or -1 in case of error)
113 // Returns the new file descriptor or -1 in case of error
114 // Using null pointers for the second and third arguments
115 // dismiss all information about the connecting client
116 if ((fd = accept(sd, reinterpret_cast<sockaddr *>(0), reinterpret_cast<socklen_t *>(0))) == -1) {
117 lyxerr << "lyx: Could not accept connection: "
118 << strerror(errno) << endl;
122 // Sets NONBLOCK mode for the file descriptor
123 if (::fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
124 lyxerr << "lyx: Could not set NONBLOCK mode for connection: "
125 << strerror(errno) << endl;
132 } // namespace socktools
133 } // namespace support