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