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- /* -*- 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 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 <http://www.gnu.org/licenses/>. */
- /*
- * shim_fork.c
- *
- * Implementation of system call "fork".
- */
- #include <shim_internal.h>
- #include <shim_table.h>
- #include <shim_thread.h>
- #include <shim_ipc.h>
- #include <shim_profile.h>
- #include <shim_checkpoint.h>
- #include <pal.h>
- #include <pal_error.h>
- #include <errno.h>
- #include <sys/syscall.h>
- #include <sys/mman.h>
- #include <asm/prctl.h>
- #include <linux/futex.h>
- 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;
- }
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