/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
/* Copyright (C) 2014 OSCAR lab, Stony Brook University
This file is part of Graphene Library OS.
Graphene Library OS is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Graphene Library OS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see . */
/*
* shim_fork.c
*
* Implementation of system call "fork".
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
int migrate_fork (struct shim_cp_store * store,
struct shim_thread * thread,
struct shim_process * process, va_list ap)
{
BEGIN_MIGRATION_DEF(fork, struct shim_thread * thread,
struct shim_process * process)
{
DEFINE_MIGRATE(process, process, sizeof(struct shim_process));
DEFINE_MIGRATE(all_mounts, NULL, 0);
DEFINE_MIGRATE(all_vmas, NULL, 0);
DEFINE_MIGRATE(running_thread, thread, sizeof(struct shim_thread));
DEFINE_MIGRATE(handle_map, thread->handle_map,
sizeof (struct shim_handle_map));
DEFINE_MIGRATE(brk, NULL, 0);
DEFINE_MIGRATE(loaded_libraries, NULL, 0);
#ifdef DEBUG
DEFINE_MIGRATE(gdb_map, NULL, 0);
#endif
DEFINE_MIGRATE(migratable, NULL, 0);
}
END_MIGRATION_DEF(fork)
int ret = START_MIGRATE(store, fork, thread, process);
thread->in_vm = false;
if (thread->exec) {
put_handle(thread->exec);
thread->exec = NULL;
}
return ret;
}
int shim_do_fork (void)
{
int ret = 0;
INC_PROFILE_OCCURENCE(syscall_use_ipc);
if ((ret = prepare_ns_leaders()) < 0)
return ret;
struct shim_thread * cur_thread = get_cur_thread();
struct shim_thread * new_thread = get_new_thread(0);
if (!new_thread)
return -ENOMEM;
new_thread->tcb = cur_thread->tcb;
new_thread->user_tcb = cur_thread->user_tcb;
new_thread->tgid = new_thread->tid;
new_thread->in_vm = false;
new_thread->is_alive = true;
add_thread(new_thread);
set_as_child(cur_thread, new_thread);
if ((ret = do_migrate_process(&migrate_fork, NULL, NULL, new_thread)) < 0) {
put_thread(new_thread);
return ret;
}
lock(new_thread->lock);
struct shim_handle_map * handle_map = new_thread->handle_map;
new_thread->handle_map = NULL;
unlock(new_thread->lock);
if (handle_map)
put_handle_map(handle_map);
IDTYPE tid = new_thread->tid;
put_thread(new_thread);
return tid;
}