structure.dot

digraph LensorOS {
    graph [ rankdir=LR, overlap=false];

    libc_fopen -> sys_open;
    libc_fclose -> sys_close;
    libc_fread -> sys_read;
    libc_fwrite -> sys_write;
    libc_fseek -> sys_seek;
    libc_exit -> sys_exit;
    libc_system -> sys_fork;

    libc_printf -> sys_write;
    libc_fputc -> sys_write;
    libc_fputs -> sys_write;

    libc_scanf -> sys_read;
    libc_fgetc -> sys_read;
    libc_fgets -> sys_read;

    sys_open -> "VFS::open()";
    sys_close -> "VFS::close()";
    sys_read -> "VFS::read()";
    sys_read -> "Scheduler::yield()"[style="dotted"];
    sys_write -> "VFS::write()";
    sys_write -> "Scheduler::yield()"[style="dotted"];
    # sys_poke;
    sys_exit -> "Scheduler::remove_process()";
    sys_exit -> "Scheduler::yield()";
    sys_map -> "Memory::map_pages()";
    sys_map -> "Memory::request_pages()";
    sys_unmap -> "Memory::unmap_pages()";
    sys_unmap -> "Memory::free_pages()";
    # sys_time;
    sys_waitpid -> "Scheduler::yield()"[style="dotted"];
    sys_fork -> "Scheduler::add_process()";
    sys_fork -> "Memory::map_pages()";
    sys_fork -> "Memory::request_pages()";
    sys_fork -> "VFS::add_file()";
    sys_exec -> "Scheduler::add_process()";
    sys_exec -> "VFS::open()";
    sys_exec -> "VFS::close()";
    sys_exec -> "VFS::read()";
    sys_exec -> "Memory::request_pages()";
    sys_exec -> "Memory::map_pages()";
    sys_exec -> "Scheduler::yield()";
    sys_repfd -> "VFS::dup2()";
    sys_pipe -> "VFS::add_file()";
    # sys_seek;
    # sys_pwd;
    sys_dup -> "VFS::dup()";
    # sys_uart;
    sys_socket -> "VFS::add_file()";
    # sys_bind;
    # sys_listen;
    # sys_connect;
    sys_accept -> "VFS::add_file()";
    sys_accept -> "Scheduler::yield()"[style="dotted"];
    # sys_kqueue;
    # sys_kevent;
    sys_directory_data -> "VFS::directory_data()";

    "Scheduler::remove_process()" -> "Process::destroy()";

    "Process::destroy()" -> "Memory::free_pages()";
    "Process::destroy()" -> "VFS::close()"[style="dotted"];

    subgraph cluster_libc {
        label="libc";
        libc_fopen;
        libc_fclose;
        libc_fread;
        libc_fwrite;
        libc_fseek;
        libc_exit;
        libc_system;

        libc_printf;
        libc_fputc;
        libc_fputs;

        libc_scanf;
        libc_fgetc;
        libc_fgets;
    }

    subgraph cluster_syscalls {
        label="Userspace Interface";
        sys_open;
        sys_close;
        sys_read;
        sys_write;
        # sys_poke;
        sys_exit;
        sys_map;
        sys_unmap;
        # sys_time;
        sys_waitpid;
        sys_fork;
        sys_exec;
        sys_repfd;
        sys_pipe;
        sys_seek;
        # sys_pwd;
        sys_dup;
        # sys_uart;
        sys_socket;
        # sys_bind;
        # sys_listen;
        # sys_connect;
        sys_accept;
        # sys_kqueue;
        # sys_kevent;
        sys_directory_data;
        }        subgraph cluster_vfs {
            label="Virtual File System";
            "VFS::open()";
            "VFS::close()";
            "VFS::read()";
            "VFS::write()";
            "VFS::directory_data()";
            "VFS::add_file()";
            "VFS::dup()";
            "VFS::dup2()";
        }


        subgraph cluster_sched {
            label="Scheduler";
            "Scheduler::add_process()";
            "Scheduler::remove_process()";
            "Scheduler::yield()";
        }

        subgraph cluster_proc {
            label="Process";
            "Process::destroy()";
        }

        subgraph cluster_pmm {
            label="Physical Memory Manager";
            "Memory::request_pages()";
            "Memory::free_pages()";
        }

        subgraph cluster_vmm {
            label="Virtual Memory Manager";
            "Memory::map_pages()";
            "Memory::unmap_pages()";
        }
    }