137 lines
3.1 KiB
C++
137 lines
3.1 KiB
C++
/*
|
|
* \brief Support for the Linux-specific environment
|
|
* \author Norman Feske
|
|
* \date 2008-12-12
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2008-2012 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#include <util/arg_string.h>
|
|
#include <base/platform_env.h>
|
|
#include <base/thread.h>
|
|
#include <linux_syscalls.h>
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
/********************************
|
|
** Platform_env::Local_parent **
|
|
********************************/
|
|
|
|
Session_capability
|
|
Platform_env::Local_parent::session(Service_name const &service_name,
|
|
Session_args const &args)
|
|
{
|
|
if (strcmp(service_name.string(),
|
|
Rm_session::service_name()) == 0)
|
|
{
|
|
size_t size =
|
|
Arg_string::find_arg(args.string(),"size")
|
|
.ulong_value(~0);
|
|
|
|
if (size == 0)
|
|
return Parent_client::session(service_name, args);
|
|
|
|
Rm_session_mmap *rm = new (env()->heap())
|
|
Rm_session_mmap(true, size);
|
|
|
|
return Session_capability::local_cap(rm);
|
|
}
|
|
|
|
return Parent_client::session(service_name, args);
|
|
}
|
|
|
|
|
|
void Platform_env::Local_parent::close(Session_capability session)
|
|
{
|
|
/*
|
|
* Handle non-local capabilities
|
|
*/
|
|
if (session.valid()) {
|
|
Parent_client::close(session);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Detect capability to local RM session
|
|
*/
|
|
Capability<Rm_session_mmap> rm = static_cap_cast<Rm_session_mmap>(session);
|
|
|
|
destroy(env()->heap(), Capability<Rm_session_mmap>::deref(rm));
|
|
}
|
|
|
|
|
|
Platform_env::Local_parent::Local_parent(Parent_capability parent_cap)
|
|
: Parent_client(parent_cap) { }
|
|
|
|
|
|
/******************
|
|
** Platform_env **
|
|
******************/
|
|
|
|
/**
|
|
* List of Unix environment variables, initialized by the startup code
|
|
*/
|
|
extern char **lx_environ;
|
|
|
|
|
|
/**
|
|
* Read environment variable as long value
|
|
*/
|
|
unsigned long Platform_env::_get_env_ulong(const char *key)
|
|
{
|
|
for (char **curr = lx_environ; curr && *curr; curr++) {
|
|
|
|
Arg arg = Arg_string::find_arg(*curr, key);
|
|
if (arg.valid())
|
|
return arg.ulong_value(0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*****************************
|
|
** Support for IPC library **
|
|
*****************************/
|
|
|
|
namespace Genode {
|
|
|
|
Native_connection_state server_socket_pair()
|
|
{
|
|
/*
|
|
* Obtain access to Linux-specific extension of the CPU session
|
|
* interface. We can cast to the specific type because the Linux
|
|
* version of 'Platform_env' is hosting a 'Linux_cpu_client' object.
|
|
*/
|
|
Linux_cpu_session *cpu = dynamic_cast<Linux_cpu_session *>(env()->cpu_session());
|
|
|
|
if (!cpu) {
|
|
PERR("could not obtain Linux extension to CPU session interface");
|
|
struct Could_not_access_linux_cpu_session { };
|
|
throw Could_not_access_linux_cpu_session();
|
|
}
|
|
|
|
Native_connection_state ncs;
|
|
|
|
Thread_base *thread = Thread_base::myself();
|
|
if (thread) {
|
|
ncs.server_sd = cpu->server_sd(thread->cap()).dst().socket;
|
|
ncs.client_sd = cpu->client_sd(thread->cap()).dst().socket;
|
|
}
|
|
return ncs;
|
|
}
|
|
|
|
void destroy_server_socket_pair(Native_connection_state const &ncs)
|
|
{
|
|
/* close local file descriptor if it is valid */
|
|
if (ncs.server_sd != -1) lx_close(ncs.server_sd);
|
|
if (ncs.client_sd != -1) lx_close(ncs.client_sd);
|
|
}
|
|
}
|