326 lines
8.1 KiB
C++
326 lines
8.1 KiB
C++
#include <BAN/StringView.h>
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#include <kernel/CriticalScope.h>
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#include <kernel/FS/VirtualFileSystem.h>
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#include <kernel/LockGuard.h>
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#include <kernel/Memory/MMU.h>
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#include <kernel/Process.h>
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#include <kernel/Scheduler.h>
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#include <fcntl.h>
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namespace Kernel
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{
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static BAN::Vector<Process*> s_processes;
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static SpinLock s_process_lock;
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Process* Process::create_process()
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{
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static pid_t s_next_pid = 1;
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auto* process = new Process(s_next_pid++);
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ASSERT(process);
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s_process_lock.lock();
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MUST(s_processes.push_back(process));
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s_process_lock.unlock();
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return process;
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}
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BAN::ErrorOr<Process*> Process::create_kernel(entry_t entry, void* data)
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{
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auto* process = create_process();
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TRY(process->m_working_directory.push_back('/'));
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TRY(process->add_thread(entry, data));
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return process;
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}
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BAN::ErrorOr<Process*> Process::create_userspace(void(*entry)())
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{
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auto* process = create_process();
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TRY(process->m_working_directory.push_back('/'));
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TRY(process->init_stdio());
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TRY(process->add_thread(
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[](void* entry_func)
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{
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Thread& current = Thread::current();
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MMU::get().allocate_range(current.stack_base(), current.stack_size(), MMU::Flags::UserSupervisor | MMU::Flags::ReadWrite | MMU::Flags::Present);
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current.jump_userspace((uintptr_t)entry_func);
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ASSERT_NOT_REACHED();
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}, (void*)entry
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));
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return process;
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}
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Process::Process(pid_t pid)
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: m_pid(pid)
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, m_tty(TTY::current())
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{ }
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Process::~Process()
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{
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exit();
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}
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BAN::ErrorOr<Thread*> Process::add_thread(entry_t entry, void* data)
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{
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Thread* thread = TRY(Thread::create(entry, data, this));
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LockGuard _(m_lock);
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TRY(m_threads.push_back(thread));
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if (auto res = Scheduler::get().add_thread(thread); res.is_error())
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{
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m_threads.pop_back();
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return res.release_error();
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}
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return thread;
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}
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void Process::on_thread_exit(Thread& thread)
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{
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LockGuard _(m_lock);
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for (size_t i = 0; i < m_threads.size(); i++)
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if (m_threads[i] == &thread)
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m_threads.remove(i);
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}
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void Process::exit()
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{
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CriticalScope _;
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m_threads.clear();
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for (auto& open_fd : m_open_files)
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open_fd.inode = nullptr;
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Scheduler::get().set_current_process_done();
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}
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BAN::ErrorOr<void> Process::init_stdio()
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{
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ASSERT(m_open_files.empty());
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TRY(open("/dev/tty1", O_RDONLY)); // stdin
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TRY(open("/dev/tty1", O_WRONLY)); // stdout
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TRY(open("/dev/tty1", O_WRONLY)); // stderr
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return {};
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}
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BAN::ErrorOr<void> Process::set_termios(const termios& termios)
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{
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if (m_tty == nullptr)
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return BAN::Error::from_errno(ENOTTY);
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m_tty->set_termios(termios);
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return {};
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}
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BAN::ErrorOr<int> Process::open(BAN::StringView path, int flags)
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{
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if (flags & ~O_RDWR)
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return BAN::Error::from_errno(ENOTSUP);
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BAN::String absolute_path = TRY(absolute_path_of(path));
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auto file = TRY(VirtualFileSystem::get().file_from_absolute_path(absolute_path));
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LockGuard _(m_lock);
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int fd = TRY(get_free_fd());
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auto& open_file_description = m_open_files[fd];
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open_file_description.inode = file.inode;
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open_file_description.path = BAN::move(file.canonical_path);
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open_file_description.offset = 0;
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open_file_description.flags = flags;
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return fd;
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}
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BAN::ErrorOr<void> Process::close(int fd)
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{
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LockGuard _(m_lock);
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TRY(validate_fd(fd));
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auto& open_file_description = this->open_file_description(fd);
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open_file_description.inode = nullptr;
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return {};
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}
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BAN::ErrorOr<size_t> Process::read(int fd, void* buffer, size_t count)
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{
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m_lock.lock();
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TRY(validate_fd(fd));
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auto open_fd_copy = open_file_description(fd);
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m_lock.unlock();
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if (!(open_fd_copy.flags & O_RDONLY))
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return BAN::Error::from_errno(EBADF);
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size_t n_read = TRY(open_fd_copy.inode->read(open_fd_copy.offset, buffer, count));
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open_fd_copy.offset += n_read;
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m_lock.lock();
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MUST(validate_fd(fd));
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open_file_description(fd) = open_fd_copy;
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m_lock.unlock();
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return n_read;
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}
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BAN::ErrorOr<size_t> Process::write(int fd, const void* buffer, size_t count)
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{
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m_lock.lock();
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TRY(validate_fd(fd));
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auto open_fd_copy = open_file_description(fd);
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m_lock.unlock();
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if (!(open_fd_copy.flags & O_WRONLY))
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return BAN::Error::from_errno(EBADF);
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size_t n_written = TRY(open_fd_copy.inode->write(open_fd_copy.offset, buffer, count));
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open_fd_copy.offset += n_written;
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m_lock.lock();
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MUST(validate_fd(fd));
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open_file_description(fd) = open_fd_copy;
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m_lock.unlock();
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return n_written;
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}
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BAN::ErrorOr<void> Process::creat(BAN::StringView path, mode_t mode)
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{
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auto absolute_path = TRY(absolute_path_of(path));
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size_t index;
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for (index = absolute_path.size(); index > 0; index--)
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if (absolute_path[index - 1] == '/')
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break;
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auto directory = absolute_path.sv().substring(0, index);
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auto file_name = absolute_path.sv().substring(index);
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auto parent_file = TRY(VirtualFileSystem::get().file_from_absolute_path(directory));
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TRY(parent_file.inode->create_file(file_name, mode));
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return {};
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}
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BAN::ErrorOr<void> Process::mount(BAN::StringView partition, BAN::StringView path)
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{
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auto absolute_partition = TRY(absolute_path_of(partition));
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auto absolute_path = TRY(absolute_path_of(path));
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TRY(VirtualFileSystem::get().mount(absolute_partition, absolute_path));
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return {};
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}
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BAN::ErrorOr<void> Process::fstat(int fd, struct stat* out)
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{
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m_lock.lock();
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TRY(validate_fd(fd));
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auto open_fd_copy = open_file_description(fd);
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m_lock.unlock();
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out->st_dev = open_fd_copy.inode->dev();
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out->st_ino = open_fd_copy.inode->ino();
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out->st_mode = open_fd_copy.inode->mode().mode;
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out->st_nlink = open_fd_copy.inode->nlink();
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out->st_uid = open_fd_copy.inode->uid();
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out->st_gid = open_fd_copy.inode->gid();
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out->st_rdev = open_fd_copy.inode->rdev();
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out->st_size = open_fd_copy.inode->size();
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out->st_atim = open_fd_copy.inode->atime();
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out->st_mtim = open_fd_copy.inode->mtime();
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out->st_ctim = open_fd_copy.inode->ctime();
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out->st_blksize = open_fd_copy.inode->blksize();
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out->st_blocks = open_fd_copy.inode->blocks();
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return {};
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}
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BAN::ErrorOr<void> Process::stat(BAN::StringView path, struct stat* out)
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{
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int fd = TRY(open(path, O_RDONLY));
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auto ret = fstat(fd, out);
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MUST(close(fd));
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return ret;
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}
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BAN::ErrorOr<BAN::Vector<BAN::String>> Process::read_directory_entries(int fd)
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{
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m_lock.lock();
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TRY(validate_fd(fd));
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auto open_fd_copy = open_file_description(fd);
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m_lock.unlock();
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auto result = TRY(open_fd_copy.inode->read_directory_entries(open_fd_copy.offset));
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open_fd_copy.offset++;
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m_lock.lock();
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MUST(validate_fd(fd));
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open_file_description(fd) = open_fd_copy;
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m_lock.unlock();
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return result;
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}
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BAN::ErrorOr<BAN::String> Process::working_directory() const
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{
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BAN::String result;
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LockGuard _(m_lock);
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TRY(result.append(m_working_directory));
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return result;
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}
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BAN::ErrorOr<void> Process::set_working_directory(BAN::StringView path)
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{
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BAN::String absolute_path = TRY(absolute_path_of(path));
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auto file = TRY(VirtualFileSystem::get().file_from_absolute_path(absolute_path));
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if (!file.inode->mode().ifdir())
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return BAN::Error::from_errno(ENOTDIR);
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LockGuard _(m_lock);
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m_working_directory = BAN::move(file.canonical_path);
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return {};
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}
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BAN::ErrorOr<BAN::String> Process::absolute_path_of(BAN::StringView path) const
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{
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if (path.empty())
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return working_directory();
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BAN::String absolute_path;
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if (path.front() != '/')
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{
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LockGuard _(m_lock);
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TRY(absolute_path.append(m_working_directory));
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}
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if (!absolute_path.empty() && absolute_path.back() != '/')
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TRY(absolute_path.push_back('/'));
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TRY(absolute_path.append(path));
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return absolute_path;
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}
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BAN::ErrorOr<void> Process::validate_fd(int fd)
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{
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ASSERT(m_lock.is_locked());
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if (fd < 0 || m_open_files.size() <= (size_t)fd || !m_open_files[fd].inode)
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return BAN::Error::from_errno(EBADF);
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return {};
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}
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Process::OpenFileDescription& Process::open_file_description(int fd)
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{
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ASSERT(m_lock.is_locked());
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MUST(validate_fd(fd));
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return m_open_files[fd];
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}
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BAN::ErrorOr<int> Process::get_free_fd()
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{
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ASSERT(m_lock.is_locked());
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for (size_t fd = 0; fd < m_open_files.size(); fd++)
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if (!m_open_files[fd].inode)
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return fd;
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TRY(m_open_files.push_back({}));
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return m_open_files.size() - 1;
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}
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} |