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