/* Copyright (C) 2014 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 Lesser 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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
static 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(migratable, NULL, 0);
DEFINE_MIGRATE(brk, NULL, 0);
DEFINE_MIGRATE(loaded_libraries, NULL, 0);
#ifdef DEBUG
DEFINE_MIGRATE(gdb_map, NULL, 0);
#endif
}
END_MIGRATION_DEF(fork)
int migrate_fork(struct shim_cp_store* store, struct shim_thread* thread,
struct shim_process* process, va_list ap) {
__UNUSED(ap);
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->shim_tcb = cur_thread->shim_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;
new_thread->shim_tcb = NULL;
unlock(&new_thread->lock);
if (handle_map)
put_handle_map(handle_map);
IDTYPE tid = new_thread->tid;
put_thread(new_thread);
return tid;
}