108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
/*
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* \brief Support for communication over Unix domain sockets
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* \author Norman Feske
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* \date 2012-08-10
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _CORE__INCLUDE__SERVER_SOCKET_PAIR_H_
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#define _CORE__INCLUDE__SERVER_SOCKET_PAIR_H_
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/* Linux syscall bindings */
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#include <core_linux_syscalls.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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/* base-internal includes */
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#include <base/internal/socket_descriptor_registry.h>
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/* core-local includes */
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#include <resource_path.h>
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/**
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* Utility: Create socket address for server entrypoint at thread ID
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*/
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struct Uds_addr : sockaddr_un
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{
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Uds_addr(long thread_id)
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{
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sun_family = AF_UNIX;
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Genode::snprintf(sun_path, sizeof(sun_path), "%s/ep-%ld",
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resource_path(), thread_id);
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}
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};
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/**
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* Utility: Create named socket pair for given unique ID
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*/
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static inline Genode::Native_connection_state create_server_socket_pair(long id)
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{
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Genode::Native_connection_state ncs;
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/*
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* Main thread uses 'Ipc_server' for 'sleep_forever()' only. No need for
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* binding.
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*/
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if (id == -1)
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return ncs;
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Uds_addr addr(id);
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/*
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* Create server-side socket
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*/
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ncs.server_sd = lx_socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (ncs.server_sd < 0) {
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PRAW("Error: Could not create server-side socket (ret=%d)", ncs.server_sd);
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class Server_socket_failed { };
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throw Server_socket_failed();
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}
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/* make sure bind succeeds */
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lx_unlink(addr.sun_path);
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int const bind_ret = lx_bind(ncs.server_sd, (sockaddr *)&addr, sizeof(addr));
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if (bind_ret < 0) {
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PRAW("Error: Could not bind server socket (ret=%d)", bind_ret);
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class Bind_failed { };
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throw Bind_failed();
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}
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/*
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* Create client-side socket
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*/
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ncs.client_sd = lx_socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (ncs.client_sd < 0) {
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PRAW("Error: Could not create client-side socket (ret=%d)", ncs.client_sd);
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class Client_socket_failed { };
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throw Client_socket_failed();
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}
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int const conn_ret = lx_connect(ncs.client_sd, (sockaddr *)&addr, sizeof(addr));
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if (conn_ret < 0) {
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PRAW("Error: Could not connect client-side socket (ret=%d)", conn_ret);
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class Connect_failed { };
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throw Connect_failed();
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}
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ncs.client_sd = Genode::ep_sd_registry()->try_associate(ncs.client_sd, id);
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/*
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* Wipe Unix domain socket from the file system. It will live as long as
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* there exist references to it in the form of file descriptors.
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*/
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lx_unlink(addr.sun_path);
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return ncs;
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}
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#endif /* _CORE__INCLUDE__SERVER_SOCKET_PAIR_H_ */
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