mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-14 11:54:53 +03:00
c8e2bb5605
The syscall is quite simple:
int watch_file(const char* path, int path_length);
It returns a file descriptor referring to a "InodeWatcher" object in the
kernel. It becomes readable whenever something changes about the inode.
Currently this is implemented by hooking the "metadata dirty bit" in
Inode which isn't perfect, but it's a start. :^)
477 lines
15 KiB
C++
477 lines
15 KiB
C++
#pragma once
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#include <AK/AKString.h>
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#include <AK/InlineLinkedList.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <AK/WeakPtr.h>
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#include <AK/Weakable.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Lock.h>
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#include <Kernel/Syscall.h>
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#include <Kernel/TTY/TTY.h>
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#include <Kernel/Thread.h>
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#include <Kernel/UnixTypes.h>
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#include <Kernel/VM/RangeAllocator.h>
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#include <LibC/signal_numbers.h>
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class ELFLoader;
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class FileDescription;
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class PageDirectory;
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class Region;
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class VMObject;
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class ProcessTracer;
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timeval kgettimeofday();
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void kgettimeofday(timeval&);
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extern VirtualAddress g_return_to_ring3_from_signal_trampoline;
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extern VirtualAddress g_return_to_ring0_from_signal_trampoline;
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class Process : public InlineLinkedListNode<Process>
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, public Weakable<Process> {
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friend class InlineLinkedListNode<Process>;
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friend class Thread;
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public:
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static Process* create_kernel_process(String&& name, void (*entry)());
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static Process* create_user_process(const String& path, uid_t, gid_t, pid_t ppid, int& error, Vector<String>&& arguments = Vector<String>(), Vector<String>&& environment = Vector<String>(), TTY* = nullptr);
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~Process();
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static Vector<pid_t> all_pids();
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static Vector<Process*> all_processes();
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enum Priority {
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IdlePriority,
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FirstPriority = IdlePriority,
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LowPriority,
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NormalPriority,
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HighPriority,
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LastPriority = HighPriority,
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};
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enum RingLevel {
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Ring0 = 0,
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Ring3 = 3,
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};
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bool is_dead() const { return m_dead; }
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Thread::State state() const { return main_thread().state(); }
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Thread& main_thread() { return *m_main_thread; }
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const Thread& main_thread() const { return *m_main_thread; }
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bool is_ring0() const { return m_ring == Ring0; }
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bool is_ring3() const { return m_ring == Ring3; }
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PageDirectory& page_directory() { return *m_page_directory; }
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const PageDirectory& page_directory() const { return *m_page_directory; }
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static Process* from_pid(pid_t);
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void set_priority(Priority p) { m_priority = p; }
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Priority priority() const { return m_priority; }
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const String& name() const { return m_name; }
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pid_t pid() const { return m_pid; }
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pid_t sid() const { return m_sid; }
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pid_t pgid() const { return m_pgid; }
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uid_t uid() const { return m_uid; }
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gid_t gid() const { return m_gid; }
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const HashTable<gid_t>& gids() const { return m_gids; }
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uid_t euid() const { return m_euid; }
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gid_t egid() const { return m_egid; }
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pid_t ppid() const { return m_ppid; }
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mode_t umask() const { return m_umask; }
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bool in_group(gid_t) const;
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FileDescription* file_description(int fd);
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const FileDescription* file_description(int fd) const;
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template<typename Callback>
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static void for_each(Callback);
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template<typename Callback>
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static void for_each_in_pgrp(pid_t, Callback);
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template<typename Callback>
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void for_each_child(Callback);
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template<typename Callback>
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void for_each_thread(Callback) const;
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void die();
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void finalize();
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int sys$watch_file(const char* path, int path_length);
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int sys$dbgputch(u8);
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int sys$dbgputstr(const u8*, int length);
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int sys$dump_backtrace();
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int sys$gettid();
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int sys$donate(int tid);
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int sys$shm_open(const char* name, int flags, mode_t);
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int sys$shm_unlink(const char* name);
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int sys$ftruncate(int fd, off_t);
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pid_t sys$setsid();
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pid_t sys$getsid(pid_t);
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int sys$setpgid(pid_t pid, pid_t pgid);
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pid_t sys$getpgrp();
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pid_t sys$getpgid(pid_t);
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uid_t sys$getuid();
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gid_t sys$getgid();
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uid_t sys$geteuid();
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gid_t sys$getegid();
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pid_t sys$getpid();
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pid_t sys$getppid();
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mode_t sys$umask(mode_t);
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int sys$open(const Syscall::SC_open_params*);
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int sys$close(int fd);
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ssize_t sys$read(int fd, u8*, ssize_t);
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ssize_t sys$write(int fd, const u8*, ssize_t);
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ssize_t sys$writev(int fd, const struct iovec* iov, int iov_count);
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int sys$fstat(int fd, stat*);
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int sys$lstat(const char*, stat*);
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int sys$stat(const char*, stat*);
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int sys$lseek(int fd, off_t, int whence);
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int sys$kill(pid_t pid, int sig);
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[[noreturn]] void sys$exit(int status);
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[[noreturn]] void sys$sigreturn();
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pid_t sys$waitpid(pid_t, int* wstatus, int options);
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void* sys$mmap(const Syscall::SC_mmap_params*);
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int sys$munmap(void*, size_t size);
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int sys$set_mmap_name(void*, size_t, const char*);
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int sys$select(const Syscall::SC_select_params*);
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int sys$poll(pollfd*, int nfds, int timeout);
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ssize_t sys$get_dir_entries(int fd, void*, ssize_t);
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int sys$getcwd(char*, ssize_t);
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int sys$chdir(const char*);
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int sys$sleep(unsigned seconds);
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int sys$usleep(useconds_t usec);
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int sys$gettimeofday(timeval*);
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int sys$gethostname(char*, ssize_t);
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int sys$uname(utsname*);
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int sys$readlink(const char*, char*, ssize_t);
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int sys$ttyname_r(int fd, char*, ssize_t);
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int sys$ptsname_r(int fd, char*, ssize_t);
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pid_t sys$fork(RegisterDump&);
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int sys$execve(const char* filename, const char** argv, const char** envp);
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int sys$isatty(int fd);
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int sys$getdtablesize();
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int sys$dup(int oldfd);
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int sys$dup2(int oldfd, int newfd);
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int sys$sigaction(int signum, const sigaction* act, sigaction* old_act);
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int sys$sigprocmask(int how, const sigset_t* set, sigset_t* old_set);
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int sys$sigpending(sigset_t*);
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int sys$getgroups(ssize_t, gid_t*);
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int sys$setgroups(ssize_t, const gid_t*);
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int sys$pipe(int* pipefd);
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int sys$killpg(int pgrp, int sig);
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int sys$setgid(gid_t);
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int sys$setuid(uid_t);
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unsigned sys$alarm(unsigned seconds);
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int sys$access(const char* pathname, int mode);
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int sys$fcntl(int fd, int cmd, u32 extra_arg);
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int sys$ioctl(int fd, unsigned request, unsigned arg);
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int sys$mkdir(const char* pathname, mode_t mode);
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clock_t sys$times(tms*);
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int sys$utime(const char* pathname, const struct utimbuf*);
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int sys$link(const char* old_path, const char* new_path);
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int sys$unlink(const char* pathname);
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int sys$symlink(const char* target, const char* linkpath);
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int sys$rmdir(const char* pathname);
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int sys$read_tsc(u32* lsw, u32* msw);
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int sys$chmod(const char* pathname, mode_t);
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int sys$fchmod(int fd, mode_t);
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int sys$chown(const char* pathname, uid_t, gid_t);
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int sys$fchown(int fd, uid_t, gid_t);
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int sys$socket(int domain, int type, int protocol);
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int sys$bind(int sockfd, const sockaddr* addr, socklen_t);
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int sys$listen(int sockfd, int backlog);
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int sys$accept(int sockfd, sockaddr*, socklen_t*);
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int sys$connect(int sockfd, const sockaddr*, socklen_t);
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ssize_t sys$sendto(const Syscall::SC_sendto_params*);
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ssize_t sys$recvfrom(const Syscall::SC_recvfrom_params*);
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int sys$getsockopt(const Syscall::SC_getsockopt_params*);
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int sys$setsockopt(const Syscall::SC_setsockopt_params*);
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int sys$getsockname(int sockfd, sockaddr* addr, socklen_t* addrlen);
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int sys$getpeername(int sockfd, sockaddr* addr, socklen_t* addrlen);
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int sys$sched_setparam(pid_t pid, const struct sched_param* param);
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int sys$sched_getparam(pid_t pid, struct sched_param* param);
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int sys$restore_signal_mask(u32 mask);
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int sys$create_thread(int (*)(void*), void*);
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void sys$exit_thread(int code);
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int sys$rename(const char* oldpath, const char* newpath);
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int sys$systrace(pid_t);
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int sys$mknod(const char* pathname, mode_t, dev_t);
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int sys$create_shared_buffer(int, void** buffer);
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int sys$share_buffer_with(int, pid_t peer_pid);
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void* sys$get_shared_buffer(int shared_buffer_id);
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int sys$release_shared_buffer(int shared_buffer_id);
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int sys$seal_shared_buffer(int shared_buffer_id);
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int sys$get_shared_buffer_size(int shared_buffer_id);
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int sys$halt();
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int sys$reboot();
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static void initialize();
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[[noreturn]] void crash(int signal, u32 eip);
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[[nodiscard]] static int reap(Process&);
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const TTY* tty() const { return m_tty; }
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void set_tty(TTY* tty) { m_tty = tty; }
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size_t region_count() const { return m_regions.size(); }
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const NonnullRefPtrVector<Region>& regions() const { return m_regions; }
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void dump_regions();
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ProcessTracer* tracer() { return m_tracer.ptr(); }
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ProcessTracer& ensure_tracer();
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u32 m_ticks_in_user { 0 };
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u32 m_ticks_in_kernel { 0 };
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u32 m_ticks_in_user_for_dead_children { 0 };
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u32 m_ticks_in_kernel_for_dead_children { 0 };
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bool validate_read_from_kernel(VirtualAddress) const;
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bool validate_read(const void*, ssize_t) const;
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bool validate_write(void*, ssize_t) const;
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bool validate_read_str(const char* str);
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template<typename T>
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bool validate_read_typed(T* value, size_t count = 1) { return validate_read(value, sizeof(T) * count); }
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template<typename T>
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bool validate_write_typed(T* value, size_t count = 1) { return validate_write(value, sizeof(T) * count); }
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Custody& current_directory();
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Custody* executable() { return m_executable.ptr(); }
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int number_of_open_file_descriptors() const;
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int max_open_file_descriptors() const { return m_max_open_file_descriptors; }
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size_t amount_virtual() const;
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size_t amount_resident() const;
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size_t amount_shared() const;
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Process* fork(RegisterDump&);
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int exec(String path, Vector<String> arguments, Vector<String> environment);
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bool is_superuser() const { return m_euid == 0; }
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Region* allocate_region_with_vmo(VirtualAddress, size_t, NonnullRefPtr<VMObject>, size_t offset_in_vmo, const String& name, int prot);
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Region* allocate_file_backed_region(VirtualAddress, size_t, NonnullRefPtr<Inode>, const String& name, int prot);
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Region* allocate_region(VirtualAddress, size_t, const String& name, int prot = PROT_READ | PROT_WRITE, bool commit = true);
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bool deallocate_region(Region& region);
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void set_being_inspected(bool b) { m_being_inspected = b; }
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bool is_being_inspected() const { return m_being_inspected; }
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void terminate_due_to_signal(u8 signal);
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void send_signal(u8, Process* sender);
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int thread_count() const;
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Lock& big_lock() { return m_big_lock; }
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unsigned syscall_count() const { return m_syscall_count; }
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void did_syscall() { ++m_syscall_count; }
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const ELFLoader* elf_loader() const { return m_elf_loader.ptr(); }
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private:
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friend class MemoryManager;
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friend class Scheduler;
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friend class Region;
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Process(String&& name, uid_t, gid_t, pid_t ppid, RingLevel, RefPtr<Custody> cwd = nullptr, RefPtr<Custody> executable = nullptr, TTY* = nullptr, Process* fork_parent = nullptr);
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Range allocate_range(VirtualAddress, size_t);
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int do_exec(String path, Vector<String> arguments, Vector<String> environment);
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ssize_t do_write(FileDescription&, const u8*, int data_size);
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int alloc_fd(int first_candidate_fd = 0);
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void disown_all_shared_buffers();
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Thread* m_main_thread { nullptr };
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RefPtr<PageDirectory> m_page_directory;
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Process* m_prev { nullptr };
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Process* m_next { nullptr };
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String m_name;
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pid_t m_pid { 0 };
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uid_t m_uid { 0 };
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gid_t m_gid { 0 };
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uid_t m_euid { 0 };
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gid_t m_egid { 0 };
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pid_t m_sid { 0 };
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pid_t m_pgid { 0 };
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Priority m_priority { NormalPriority };
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struct FileDescriptionAndFlags {
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operator bool() const { return !!description; }
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void clear();
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void set(NonnullRefPtr<FileDescription>&& d, u32 f = 0);
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RefPtr<FileDescription> description;
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u32 flags { 0 };
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};
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Vector<FileDescriptionAndFlags> m_fds;
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RingLevel m_ring { Ring0 };
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static const int m_max_open_file_descriptors { FD_SETSIZE };
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u8 m_termination_status { 0 };
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u8 m_termination_signal { 0 };
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RefPtr<Custody> m_executable;
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RefPtr<Custody> m_cwd;
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TTY* m_tty { nullptr };
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Region* region_from_range(VirtualAddress, size_t);
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NonnullRefPtrVector<Region> m_regions;
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pid_t m_ppid { 0 };
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mode_t m_umask { 022 };
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static void notify_waiters(pid_t waitee, int exit_status, int signal);
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HashTable<gid_t> m_gids;
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bool m_being_inspected { false };
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bool m_dead { false };
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int m_next_tid { 0 };
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unsigned m_syscall_count { 0 };
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RefPtr<ProcessTracer> m_tracer;
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OwnPtr<ELFLoader> m_elf_loader;
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Lock m_big_lock { "Process" };
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u64 m_alarm_deadline { 0 };
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};
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class ProcessInspectionHandle {
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public:
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ProcessInspectionHandle(Process& process)
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: m_process(process)
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{
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if (&process != ¤t->process()) {
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ASSERT(!m_process.is_being_inspected());
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m_process.set_being_inspected(true);
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}
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}
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~ProcessInspectionHandle()
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{
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m_process.set_being_inspected(false);
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}
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Process& process() { return m_process; }
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static OwnPtr<ProcessInspectionHandle> from_pid(pid_t pid)
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{
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InterruptDisabler disabler;
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auto* process = Process::from_pid(pid);
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if (process)
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return make<ProcessInspectionHandle>(*process);
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return nullptr;
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}
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Process* operator->() { return &m_process; }
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Process& operator*() { return m_process; }
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private:
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Process& m_process;
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};
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extern const char* to_string(Process::Priority);
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extern InlineLinkedList<Process>* g_processes;
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template<typename Callback>
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inline void Process::for_each(Callback callback)
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{
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ASSERT_INTERRUPTS_DISABLED();
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for (auto* process = g_processes->head(); process;) {
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auto* next_process = process->next();
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if (callback(*process) == IterationDecision::Break)
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break;
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process = next_process;
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}
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}
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template<typename Callback>
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inline void Process::for_each_child(Callback callback)
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{
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ASSERT_INTERRUPTS_DISABLED();
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pid_t my_pid = pid();
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for (auto* process = g_processes->head(); process;) {
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auto* next_process = process->next();
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if (process->ppid() == my_pid) {
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if (callback(*process) == IterationDecision::Break)
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break;
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}
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process = next_process;
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}
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}
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template<typename Callback>
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inline void Process::for_each_thread(Callback callback) const
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{
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InterruptDisabler disabler;
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pid_t my_pid = pid();
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Thread::for_each([callback, my_pid](Thread& thread) -> IterationDecision {
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if (thread.pid() == my_pid)
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return callback(thread);
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return IterationDecision::Continue;
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});
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}
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template<typename Callback>
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inline void Process::for_each_in_pgrp(pid_t pgid, Callback callback)
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{
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ASSERT_INTERRUPTS_DISABLED();
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for (auto* process = g_processes->head(); process;) {
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auto* next_process = process->next();
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if (process->pgid() == pgid) {
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if (!callback(*process))
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break;
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}
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process = next_process;
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}
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}
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inline bool InodeMetadata::may_read(Process& process) const
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{
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return may_read(process.euid(), process.gids());
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}
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inline bool InodeMetadata::may_write(Process& process) const
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{
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return may_write(process.euid(), process.gids());
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}
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inline bool InodeMetadata::may_execute(Process& process) const
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{
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return may_execute(process.euid(), process.gids());
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}
|
|
|
|
inline int Thread::pid() const
|
|
{
|
|
return m_process.pid();
|
|
}
|
|
|
|
inline const LogStream& operator<<(const LogStream& stream, const Process& process)
|
|
{
|
|
return stream << process.name() << '(' << process.pid() << ')';
|
|
}
|