mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 21:12:43 +00:00
101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/Debug.h>
|
|
#include <Kernel/FileSystem/Custody.h>
|
|
#include <Kernel/FileSystem/FileDescription.h>
|
|
#include <Kernel/PerformanceManager.h>
|
|
#include <Kernel/Process.h>
|
|
#include <Kernel/VM/Region.h>
|
|
|
|
namespace Kernel {
|
|
|
|
KResultOr<pid_t> Process::sys$fork(RegisterState& regs)
|
|
{
|
|
REQUIRE_PROMISE(proc);
|
|
RefPtr<Thread> child_first_thread;
|
|
auto child = adopt_ref(*new Process(child_first_thread, m_name, uid(), gid(), pid(), m_is_kernel_process, m_cwd, m_executable, m_tty, this));
|
|
if (!child_first_thread)
|
|
return ENOMEM;
|
|
child->m_root_directory = m_root_directory;
|
|
child->m_root_directory_relative_to_global_root = m_root_directory_relative_to_global_root;
|
|
child->m_veil_state = m_veil_state;
|
|
child->m_unveiled_paths = m_unveiled_paths.deep_copy();
|
|
child->m_fds = m_fds;
|
|
child->m_pg = m_pg;
|
|
|
|
{
|
|
ProtectedDataMutationScope scope { *child };
|
|
child->m_promises = m_promises;
|
|
child->m_execpromises = m_execpromises;
|
|
child->m_has_promises = m_has_promises;
|
|
child->m_has_execpromises = m_has_execpromises;
|
|
child->m_sid = m_sid;
|
|
child->m_extra_gids = m_extra_gids;
|
|
child->m_umask = m_umask;
|
|
child->m_signal_trampoline = m_signal_trampoline;
|
|
child->m_dumpable = m_dumpable;
|
|
}
|
|
|
|
dbgln_if(FORK_DEBUG, "fork: child={}", child);
|
|
child->space().set_enforces_syscall_regions(space().enforces_syscall_regions());
|
|
|
|
auto& child_tss = child_first_thread->m_tss;
|
|
child_tss.eax = 0; // fork() returns 0 in the child :^)
|
|
child_tss.ebx = regs.ebx;
|
|
child_tss.ecx = regs.ecx;
|
|
child_tss.edx = regs.edx;
|
|
child_tss.ebp = regs.ebp;
|
|
child_tss.esp = regs.userspace_esp;
|
|
child_tss.esi = regs.esi;
|
|
child_tss.edi = regs.edi;
|
|
child_tss.eflags = regs.eflags;
|
|
child_tss.eip = regs.eip;
|
|
child_tss.cs = regs.cs;
|
|
child_tss.ds = regs.ds;
|
|
child_tss.es = regs.es;
|
|
child_tss.fs = regs.fs;
|
|
child_tss.gs = regs.gs;
|
|
child_tss.ss = regs.userspace_ss;
|
|
|
|
dbgln_if(FORK_DEBUG, "fork: child will begin executing at {:04x}:{:08x} with stack {:04x}:{:08x}, kstack {:04x}:{:08x}", child_tss.cs, child_tss.eip, child_tss.ss, child_tss.esp, child_tss.ss0, child_tss.esp0);
|
|
|
|
{
|
|
ScopedSpinLock lock(space().get_lock());
|
|
for (auto& region : space().regions()) {
|
|
dbgln_if(FORK_DEBUG, "fork: cloning Region({}) '{}' @ {}", region, region->name(), region->vaddr());
|
|
auto region_clone = region->clone(*child);
|
|
if (!region_clone) {
|
|
dbgln("fork: Cannot clone region, insufficient memory");
|
|
// TODO: tear down new process?
|
|
return ENOMEM;
|
|
}
|
|
|
|
auto& child_region = child->space().add_region(region_clone.release_nonnull());
|
|
child_region.map(child->space().page_directory(), ShouldFlushTLB::No);
|
|
|
|
if (region == m_master_tls_region.unsafe_ptr())
|
|
child->m_master_tls_region = child_region;
|
|
}
|
|
|
|
ScopedSpinLock processes_lock(g_processes_lock);
|
|
g_processes->prepend(child);
|
|
}
|
|
|
|
PerformanceManager::add_process_created_event(*child);
|
|
|
|
ScopedSpinLock lock(g_scheduler_lock);
|
|
child_first_thread->set_affinity(Thread::current()->affinity());
|
|
child_first_thread->set_state(Thread::State::Runnable);
|
|
|
|
auto child_pid = child->pid().value();
|
|
// We need to leak one reference so we don't destroy the Process,
|
|
// which will be dropped by Process::reap
|
|
(void)child.leak_ref();
|
|
return child_pid;
|
|
}
|
|
|
|
}
|