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libc: test nested signal handling and RPC

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Issue #2363
This commit is contained in:
Christian Helmuth 2017-04-03 10:18:23 +02:00
parent a65a4c8621
commit e33d65aea0
1 changed files with 43 additions and 9 deletions
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52
repos/libports/src/test/libc_component/main.cc
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@ -14,10 +14,12 @@
/* Genode includes */
#include <base/log.h>
#include <base/rpc_server.h>
#include <base/signal.h>
#include <os/static_root.h>
#include <libc/component.h>
#include <libc/select.h>
#include <log_session/log_session.h>
#include <timer_session/connection.h>
/* libc includes */
#include <errno.h>
@ -32,6 +34,7 @@
namespace Log {
using Genode::Static_root;
using Genode::Log_session;
using Genode::Signal_handler;
struct Session_component;
struct Main;
@ -74,11 +77,24 @@ static void use_file_system()
struct Log::Session_component : Genode::Rpc_object<Log_session>
{
Libc::Env &_env;
Timer::Connection _timer { _env };
Signal_handler<Log::Session_component> _timer_handler {
_env.ep(), *this, &Session_component::_handle_timer };
void _handle_timer()
{
if (_in_read)
Genode::error("timer fired during read?");
}
char _buf[Log_session::MAX_STRING_LEN];
int _fd = -1;
fd_set _readfds;
fd_set _writefds;
fd_set _exceptfds;
bool _in_read = false;
void _select()
{
@ -97,6 +113,24 @@ struct Log::Session_component : Genode::Rpc_object<Log_session>
Libc::Select_handler<Session_component> _select_handler {
*this, &Session_component::_select_ready };
void _read()
{
_in_read = true;
/* never mind the potentially nested with_libc */
Libc::with_libc([&] () {
int const result = read(_fd, _buf, sizeof(_buf)-1);
if (result <= 0) {
Genode::warning("read returned ", result, " in select handler");
return;
}
_buf[result] = 0;
Genode::log("read from file \"", Genode::Cstring(_buf), "\"");
});
_in_read = false;
}
void _select_ready(int nready, fd_set const &readfds, fd_set const &writefds, fd_set const &exceptfds)
{
Libc::with_libc([&] () {
@ -116,17 +150,11 @@ struct Log::Session_component : Genode::Rpc_object<Log_session>
return;
}
int const result = read(_fd, _buf, sizeof(_buf)-1);
if (result <= 0) {
Genode::warning("read returned ", result, " in select handler");
return;
}
_buf[result] = 0;
Genode::log("read from file \"", Genode::Cstring(_buf), "\"");
_read();
});
}
Session_component()
Session_component(Libc::Env &env) : _env(env)
{
Libc::with_libc([&] () {
_fd = open("/dev/terminal", O_RDWR);
@ -137,6 +165,12 @@ struct Log::Session_component : Genode::Rpc_object<Log_session>
FD_ZERO(&_exceptfds);
FD_SET(_fd, &_readfds);
});
_timer.sigh(_timer_handler);
_timer.trigger_periodic(500*1000);
/* initially call read two times to ensure blocking */
_read(); _read();
}
Genode::size_t write(String const &string_buf)
@ -160,7 +194,7 @@ struct Log::Session_component : Genode::Rpc_object<Log_session>
struct Log::Main
{
Libc::Env &_env;
Session_component _session { };
Session_component _session { _env };
Static_root<Log_session> _root { _env.ep().manage(_session) };
Main(Libc::Env &env) : _env(env)