mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-30 00:31:14 +00:00
79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
123 lines
4.6 KiB
C++
123 lines
4.6 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/OpenFileDescription.h>
|
|
#include <Kernel/Memory/Region.h>
|
|
#include <Kernel/PerformanceManager.h>
|
|
#include <Kernel/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
|
|
{
|
|
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
|
|
REQUIRE_PROMISE(proc);
|
|
RefPtr<Thread> child_first_thread;
|
|
auto child_name = TRY(m_name->try_clone());
|
|
auto child = TRY(Process::try_create(child_first_thread, move(child_name), uid(), gid(), pid(), m_is_kernel_process, m_cwd, m_executable, m_tty, this));
|
|
child->m_veil_state = m_veil_state;
|
|
child->m_unveiled_paths = m_unveiled_paths.deep_copy();
|
|
|
|
TRY(child->m_fds.try_clone(m_fds));
|
|
|
|
child->m_pg = m_pg;
|
|
|
|
{
|
|
ProtectedDataMutationScope scope { *child };
|
|
child->m_protected_values.promises = m_protected_values.promises.load();
|
|
child->m_protected_values.execpromises = m_protected_values.execpromises.load();
|
|
child->m_protected_values.has_promises = m_protected_values.has_promises.load();
|
|
child->m_protected_values.has_execpromises = m_protected_values.has_execpromises.load();
|
|
child->m_protected_values.sid = m_protected_values.sid;
|
|
child->m_protected_values.extra_gids = m_protected_values.extra_gids;
|
|
child->m_protected_values.umask = m_protected_values.umask;
|
|
child->m_protected_values.signal_trampoline = m_protected_values.signal_trampoline;
|
|
child->m_protected_values.dumpable = m_protected_values.dumpable;
|
|
}
|
|
|
|
dbgln_if(FORK_DEBUG, "fork: child={}", child);
|
|
child->address_space().set_enforces_syscall_regions(address_space().enforces_syscall_regions());
|
|
|
|
#if ARCH(I386)
|
|
auto& child_regs = child_first_thread->m_regs;
|
|
child_regs.eax = 0; // fork() returns 0 in the child :^)
|
|
child_regs.ebx = regs.ebx;
|
|
child_regs.ecx = regs.ecx;
|
|
child_regs.edx = regs.edx;
|
|
child_regs.ebp = regs.ebp;
|
|
child_regs.esp = regs.userspace_esp;
|
|
child_regs.esi = regs.esi;
|
|
child_regs.edi = regs.edi;
|
|
child_regs.eflags = regs.eflags;
|
|
child_regs.eip = regs.eip;
|
|
child_regs.cs = regs.cs;
|
|
child_regs.ds = regs.ds;
|
|
child_regs.es = regs.es;
|
|
child_regs.fs = regs.fs;
|
|
child_regs.gs = regs.gs;
|
|
child_regs.ss = regs.userspace_ss;
|
|
|
|
dbgln_if(FORK_DEBUG, "fork: child will begin executing at {:#04x}:{:p} with stack {:#04x}:{:p}, kstack {:#04x}:{:p}",
|
|
child_regs.cs, child_regs.eip, child_regs.ss, child_regs.esp, child_regs.ss0, child_regs.esp0);
|
|
#else
|
|
auto& child_regs = child_first_thread->m_regs;
|
|
child_regs.rax = 0; // fork() returns 0 in the child :^)
|
|
child_regs.rbx = regs.rbx;
|
|
child_regs.rcx = regs.rcx;
|
|
child_regs.rdx = regs.rdx;
|
|
child_regs.rbp = regs.rbp;
|
|
child_regs.rsp = regs.userspace_rsp;
|
|
child_regs.rsi = regs.rsi;
|
|
child_regs.rdi = regs.rdi;
|
|
child_regs.r8 = regs.r8;
|
|
child_regs.r9 = regs.r9;
|
|
child_regs.r10 = regs.r10;
|
|
child_regs.r11 = regs.r11;
|
|
child_regs.r12 = regs.r12;
|
|
child_regs.r13 = regs.r13;
|
|
child_regs.r14 = regs.r14;
|
|
child_regs.r15 = regs.r15;
|
|
child_regs.rflags = regs.rflags;
|
|
child_regs.rip = regs.rip;
|
|
child_regs.cs = regs.cs;
|
|
|
|
dbgln_if(FORK_DEBUG, "fork: child will begin executing at {:#04x}:{:p} with stack {:p}, kstack {:p}",
|
|
child_regs.cs, child_regs.rip, child_regs.rsp, child_regs.rsp0);
|
|
#endif
|
|
|
|
{
|
|
SpinlockLocker lock(address_space().get_lock());
|
|
for (auto& region : address_space().regions()) {
|
|
dbgln_if(FORK_DEBUG, "fork: cloning Region({}) '{}' @ {}", region, region->name(), region->vaddr());
|
|
auto region_clone = TRY(region->try_clone());
|
|
auto* child_region = TRY(child->address_space().add_region(move(region_clone)));
|
|
TRY(child_region->map(child->address_space().page_directory(), Memory::ShouldFlushTLB::No));
|
|
|
|
if (region == m_master_tls_region.unsafe_ptr())
|
|
child->m_master_tls_region = child_region;
|
|
}
|
|
}
|
|
|
|
Process::register_new(*child);
|
|
|
|
PerformanceManager::add_process_created_event(*child);
|
|
|
|
SpinlockLocker 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();
|
|
|
|
// NOTE: All user processes have a leaked ref on them. It's balanced by Thread::WaitBlockerSet::finalize().
|
|
(void)child.leak_ref();
|
|
|
|
return child_pid;
|
|
}
|
|
|
|
}
|