174 lines
4.3 KiB
C
174 lines
4.3 KiB
C
/*
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* \brief Linux socket utilities
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* \author Christian Helmuth
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* \date 2012-01-17
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*
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* We create two sockets under lx_rpath() for each thread: client and server
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* role. The naming is 'ep-<thread id>-<role>'. The socket descriptors are
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* cached in Thread_base::_tid.
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*
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* Currently two socket files are needed, as the client does not send the reply
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* socket access-rights in a combined message with the payload. In the future,
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* only server sockets must be bound in lx_rpath().
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*/
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/*
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* Copyright (C) 2011-2012 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 _PLATFORM__LINUX_SOCKET_H_
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#define _PLATFORM__LINUX_SOCKET_H_
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/* Genode includes */
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#include <base/ipc_generic.h>
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#include <base/thread.h>
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#include <base/blocking.h>
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#include <base/snprintf.h>
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#include <linux_rpath.h>
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#include <linux_syscalls.h>
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extern "C" void wait_for_continue(void);
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extern "C" int raw_write_str(const char *str);
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#define PRAW(fmt, ...) \
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do { \
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char str[128]; \
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Genode::snprintf(str, sizeof(str), \
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ESC_ERR fmt ESC_END "\n", ##__VA_ARGS__); \
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raw_write_str(str); \
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} while (0)
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/**
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* Utility: Create socket address for thread ID and role (client/server)
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*/
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static void lx_create_sockaddr(sockaddr_un *addr, long thread_id, char const *role)
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{
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addr->sun_family = AF_UNIX;
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Genode::snprintf(addr->sun_path, sizeof(addr->sun_path), "%s/ep-%ld-%s",
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lx_rpath(), thread_id, role);
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}
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/**
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* Utility: Create a socket descriptor and file for given thread and role
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*/
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static int lx_create_socket(long thread_id, char const *role)
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{
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int sd = lx_socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (sd < 0) return -1;
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sockaddr_un addr;
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lx_create_sockaddr(&addr, thread_id, role);
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/* make sure bind succeeds */
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lx_unlink(addr.sun_path);
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if (lx_bind(sd, (sockaddr *)&addr, sizeof(addr)) < 0)
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return -2;
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return sd;
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}
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/**
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* Utility: Unlink socket file and close descriptor
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*
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* XXX Currently, socket destruction is missing. The client socket could be
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* used from multiple Ipc_client objects. A safe destruction would need
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* reference counting.
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*/
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//static void lx_destroy_socket(int sd, long thread_id, char const *role)
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//{
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// sockaddr_un addr;
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// lx_create_sockaddr(&addr, thread_id, role);
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//
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// lx_unlink(addr.sun_path);
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// lx_close(sd);
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//}
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/**
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* Get client-socket descriptor for main thread
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*/
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static int lx_main_client_socket()
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{
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static int sd = lx_create_socket(lx_gettid(), "client");
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return sd;
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}
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/**
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* Utility: Get server socket for given thread
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*/
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static int lx_server_socket(Genode::Thread_base *thread)
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{
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/*
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* Main thread uses Ipc_server for sleep_forever() only.
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*/
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if (!thread)
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return lx_socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (thread->tid().server == -1)
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thread->tid().server = lx_create_socket(thread->tid().tid, "server");
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return thread->tid().server;
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}
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/**
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* Utility: Get client socket for given thread
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*/
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static int lx_client_socket(Genode::Thread_base *thread)
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{
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if (!thread) return lx_main_client_socket();
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if (thread->tid().client == -1)
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thread->tid().client = lx_create_socket(thread->tid().tid, "client");
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return thread->tid().client;
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}
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/**
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* Utility: Send message to thread via given socket descriptor
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*/
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static void lx_send_to(int sd, long thread_id, char const *target_role,
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void *msg, Genode::size_t msg_len)
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{
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sockaddr_un addr;
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lx_create_sockaddr(&addr, thread_id, target_role);
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int res = lx_sendto(sd, msg, msg_len, 0, (sockaddr *)&addr, sizeof(addr));
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if (res < 0) {
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PRAW("Send error: %d with %s in %d", res, addr.sun_path, lx_gettid());
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wait_for_continue();
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throw Genode::Ipc_error();
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}
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}
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/**
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* Utility: Receive message via given socket descriptor
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*/
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static void lx_recv_from(int sd, void *buf, Genode::size_t buf_len)
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{
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socklen_t fromlen;
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int res = lx_recvfrom(sd, buf, buf_len, 0, 0, &fromlen);
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if (res < 0) {
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if ((-res) == EINTR)
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throw Genode::Blocking_canceled();
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else {
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PRAW("Recv error: %d in %d", res, lx_gettid());
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wait_for_continue();
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throw Genode::Ipc_error();
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}
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}
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}
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#endif /* _PLATFORM__LINUX_SOCKET_H_ */
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