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 "support/socktools.h"
14 #include "support/lyxlib.h"
18 #include <sys/socket.h>
30 #ifndef CXX_GLOBAL_CSTD
34 // This MACRO eppears to be defined only on Linux.
37 (sizeof (*(su)) - sizeof ((su)->sun_path) + strlen((su)->sun_path))
45 // Returns a local socket already in the "listen" state (or -1 in case
46 // of error). The first argument is the socket address, the second
47 // is the length of the queue for connections. If successful, a socket
48 // special file 'name' will be created in the filesystem.
49 int listen(string const & name, int queue)
51 int fd; // File descriptor for the socket
52 sockaddr_un addr; // Structure that hold the socket address
54 // We use 'name' to fill 'addr'
55 string::size_type len = name.size();
56 // the field sun_path in sockaddr_un is a char[108]
58 lyxerr << "lyx: Socket address '" << name << "' too long."
62 // Synonims for AF_UNIX are AF_LOCAL and AF_FILE
63 addr.sun_family = AF_UNIX;
64 name.copy(addr.sun_path, 107);
65 addr.sun_path[len] = '\0';
67 // This creates a file descriptor for the socket
68 // Synonims for PF_UNIX are PF_LOCAL and PF_FILE
69 // For local sockets, the protocol is always 0
70 // socket() returns -1 in case of error
71 if ((fd = ::socket(PF_UNIX, SOCK_STREAM, 0))== -1) {
72 lyxerr << "lyx: Could not create socket descriptor: "
73 << strerror(errno) << endl;
77 // Set NONBLOCK mode for the file descriptor
78 if (::fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
79 lyxerr << "lyx: Could not set NONBLOCK mode for socket descriptor: "
80 << strerror(errno) << endl;
85 // bind() gives the local address 'name' for 'fd', also creating
86 // the socket special file in the filesystem. bind() returns -1
88 if ((::bind (fd, reinterpret_cast<sockaddr *>(&addr), SUN_LEN(&addr))) == -1) {
89 lyxerr << "lyx: Could not bind address '" << name
90 << "' to socket descriptor: " << strerror(errno) << endl;
92 lyx::support::unlink(name);
96 // Puts the socket in listen state, that is, ready to accept
97 // connections. The second parameter of listen() defines the
98 // maximum length the queue of pending connections may grow to.
99 // It is not a restriction on the number of connections the socket
100 // can accept. Returns -1 in case of error
101 if (::listen (fd, queue) == -1) {
102 lyxerr << "lyx: Could not put socket in 'listen' state: "
103 << strerror(errno) << endl;
105 lyx::support::unlink(name);
112 // Returns a file descriptor for a new connection from the socket
113 // descriptor 'sd' (or -1 in case of error)
118 // Returns the new file descriptor or -1 in case of error
119 // Using null pointers for the second and third arguments
120 // dismiss all information about the connecting client
121 if ((fd = accept(sd, reinterpret_cast<sockaddr *>(0), reinterpret_cast<socklen_t *>(0))) == -1) {
122 lyxerr << "lyx: Could not accept connection: "
123 << strerror(errno) << endl;
127 // Sets NONBLOCK mode for the file descriptor
128 if (::fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
129 lyxerr << "lyx: Could not set NONBLOCK mode for connection: "
130 << strerror(errno) << endl;
137 } // namespace socktools
138 } // namespace support