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