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refactor(ipc): Refactor the syscalls in ipc (#1183)

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* feat(ipc): 完成对ipc的系统调用的重构

* refactor(ipc): 优化结构

Signed-off-by: sparkzky <sparkhhhhhhhhhh@outlook.com>

* feat: fmt

Signed-off-by: sparkzky <sparkhhhhhhhhhh@outlook.com>

---------

Signed-off-by: sparkzky <sparkhhhhhhhhhh@outlook.com>
Co-authored-by: Vitus <zhzvitus@gmail.com>
Co-authored-by: sparkzky <sparkhhhhhhhhhh@outlook.com>
This commit is contained in:
Vitus 2025-05-30 20:52:44 +08:00 committed by GitHub
parent 6ac8e1f0cd
commit 5db1f9ad54
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GPG Key ID: B5690EEEBB952194
22 changed files with 1241 additions and 756 deletions
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27
kernel/src/arch/x86_64/ipc/signal.rs
View File

@ -20,7 +20,7 @@ use crate::{
mm::MemoryManagementArch,
process::ProcessManager,
sched::{schedule, SchedMode},
syscall::{user_access::UserBufferWriter, Syscall},
syscall::user_access::UserBufferWriter,
};
/// 信号处理的栈的栈指针的最小对齐数量
@ -556,7 +556,10 @@ impl SignalArch for X86_64SignalArch {
// 如果当前的rsp不来自用户态，则认为产生了错误（或被SROP攻击）
if UserBufferWriter::new(frame, size_of::<SigFrame>(), true).is_err() {
error!("rsp doesn't from user level");
let _r = Syscall::kill_process(ProcessManager::current_pcb().pid(), Signal::SIGSEGV)
let _r = crate::ipc::kill::kill_process(
ProcessManager::current_pcb().pid(),
Signal::SIGSEGV,
)
.map_err(|e| e.to_posix_errno());
return trap_frame.rax;
}
@ -565,7 +568,10 @@ impl SignalArch for X86_64SignalArch {
// 从用户栈恢复sigcontext
if !unsafe { &mut (*frame).context }.restore_sigcontext(trap_frame) {
error!("unable to restore sigcontext");
let _r = Syscall::kill_process(ProcessManager::current_pcb().pid(), Signal::SIGSEGV)
let _r = crate::ipc::kill::kill_process(
ProcessManager::current_pcb().pid(),
Signal::SIGSEGV,
)
.map_err(|e| e.to_posix_errno());
// 如果这里返回 err 值的话会丢失上一个系统调用的返回值
}
@ -658,7 +664,7 @@ fn setup_frame(
ProcessManager::current_pcb().pid(),
sig as i32
);
let r = Syscall::kill_process(
let r = crate::ipc::kill::kill_process(
ProcessManager::current_pcb().pid(),
Signal::SIGSEGV,
);
@ -698,7 +704,8 @@ fn setup_frame(
if r.is_err() {
// 如果地址区域位于内核空间，则直接报错
// todo: 生成一个sigsegv
let r = Syscall::kill_process(ProcessManager::current_pcb().pid(), Signal::SIGSEGV);
let r =
crate::ipc::kill::kill_process(ProcessManager::current_pcb().pid(), Signal::SIGSEGV);
if r.is_err() {
error!("In setup frame: generate SIGSEGV signal failed");
}
@ -709,7 +716,10 @@ fn setup_frame(
// 将siginfo拷贝到用户栈
info.copy_siginfo_to_user(unsafe { &mut ((*frame).info) as *mut SigInfo })
.map_err(|e| -> SystemError {
let r = Syscall::kill_process(ProcessManager::current_pcb().pid(), Signal::SIGSEGV);
let r = crate::ipc::kill::kill_process(
ProcessManager::current_pcb().pid(),
Signal::SIGSEGV,
);
if r.is_err() {
error!("In copy_siginfo_to_user: generate SIGSEGV signal failed");
}
@ -723,7 +733,10 @@ fn setup_frame(
.context
.setup_sigcontext(oldset, trap_frame)
.map_err(|e: SystemError| -> SystemError {
let r = Syscall::kill_process(ProcessManager::current_pcb().pid(), Signal::SIGSEGV);
let r = crate::ipc::kill::kill_process(
ProcessManager::current_pcb().pid(),
Signal::SIGSEGV,
);
if r.is_err() {
error!("In setup_sigcontext: generate SIGSEGV signal failed");
}

7
kernel/src/driver/tty/tty_job_control.rs
View File

@ -5,10 +5,7 @@ use crate::{
arch::ipc::signal::{SigSet, Signal},
mm::VirtAddr,
process::{process_group::Pgid, Pid, ProcessFlags, ProcessManager},
syscall::{
user_access::{UserBufferReader, UserBufferWriter},
Syscall,
},
syscall::user_access::{UserBufferReader, UserBufferWriter},
};
use super::tty_core::{TtyCore, TtyIoctlCmd};
@ -59,7 +56,7 @@ impl TtyJobCtrlManager {
} else if ProcessManager::is_current_pgrp_orphaned() {
return Err(SystemError::EIO);
} else {
Syscall::kill_process_group(pgid, sig)?;
crate::ipc::kill::kill_process_group(pgid, sig)?;
ProcessManager::current_pcb()
.flags()
.insert(ProcessFlags::HAS_PENDING_SIGNAL);

4
kernel/src/driver/tty/tty_ldisc/ntty.rs
View File

@ -22,7 +22,7 @@ use crate::{
},
mm::VirtAddr,
process::{ProcessFlags, ProcessManager},
syscall::{user_access::UserBufferWriter, Syscall},
syscall::user_access::UserBufferWriter,
};
use super::TtyLineDiscipline;
@ -789,7 +789,7 @@ impl NTtyData {
let ctrl_info = tty.core().contorl_info_irqsave();
let pg = ctrl_info.pgid;
if let Some(pg) = pg {
let _ = Syscall::kill_process_group(pg, signal);
let _ = crate::ipc::kill::kill_process_group(pg, signal);
}
if !termios.local_mode.contains(LocalMode::NOFLSH) {

44
kernel/src/ipc/kill.rs Normal file
View File

@ -0,0 +1,44 @@
use crate::arch::ipc::signal::{SigCode, Signal};
use crate::ipc::signal_types::{SigInfo, SigType};
use crate::process::{process_group::Pgid, Pid, ProcessManager};
use core::sync::atomic::compiler_fence;
use system_error::SystemError;
/// ### 杀死一个进程
pub fn kill_process(pid: Pid, sig: Signal) -> Result<usize, SystemError> {
// 初始化signal info
let mut info = SigInfo::new(sig, 0, SigCode::User, SigType::Kill(pid));
compiler_fence(core::sync::atomic::Ordering::SeqCst);
let ret = sig
.send_signal_info(Some(&mut info), pid)
.map(|x| x as usize);
compiler_fence(core::sync::atomic::Ordering::SeqCst);
ret
}
/// ### 杀死一个进程组
pub fn kill_process_group(pgid: Pgid, sig: Signal) -> Result<usize, SystemError> {
let pg = ProcessManager::find_process_group(pgid).ok_or(SystemError::ESRCH)?;
let inner = pg.process_group_inner.lock();
for pcb in inner.processes.values() {
kill_process(pcb.pid(), sig)?; // Call the new common function
}
Ok(0)
}
/// ### 杀死所有进程
/// - 该函数会杀死所有进程，除了当前进程和init进程
pub fn kill_all(sig: Signal) -> Result<usize, SystemError> {
let current_pid = ProcessManager::current_pcb().pid();
let all_processes = ProcessManager::get_all_processes();
for pid_val in all_processes {
if pid_val == current_pid || pid_val.data() == 1 {
continue;
}
kill_process(pid_val, sig)?; // Call the new common function
}
Ok(0)
}

1
kernel/src/ipc/mod.rs
View File

@ -1,4 +1,5 @@
pub mod generic_signal;
pub mod kill;
pub mod pipe;
pub mod shm;
pub mod signal;

19
kernel/src/ipc/shm.rs
View File

@ -14,13 +14,13 @@ use crate::{
syscall::user_access::{UserBufferReader, UserBufferWriter},
time::PosixTimeSpec,
};
use core::fmt;
use core::sync::atomic::{compiler_fence, Ordering};
use hashbrown::HashMap;
use ida::IdAllocator;
use log::info;
use num::ToPrimitive;
use system_error::SystemError;
pub static mut SHM_MANAGER: Option<SpinLock<ShmManager>> = None;
/// 用于创建新的私有IPC对象
@ -104,6 +104,23 @@ impl From<usize> for ShmCtlCmd {
}
}
impl fmt::Display for ShmCtlCmd {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ShmCtlCmd::IpcRmid => write!(f, "IPC_RMID"),
ShmCtlCmd::IpcSet => write!(f, "IPC_SET"),
ShmCtlCmd::IpcStat => write!(f, "IPC_STAT"),
ShmCtlCmd::IpcInfo => write!(f, "IPC_INFO"),
ShmCtlCmd::ShmLock => write!(f, "SHM_LOCK"),
ShmCtlCmd::ShmUnlock => write!(f, "SHM_UNLOCK"),
ShmCtlCmd::ShmStat => write!(f, "SHM_STAT"),
ShmCtlCmd::ShmInfo => write!(f, "SHM_INFO"),
ShmCtlCmd::ShmtStatAny => write!(f, "SHM_STAT_ANY"),
ShmCtlCmd::Default => write!(f, "DEFAULT (Invalid Cmd)"),
}
}
}
impl PartialEq for ShmCtlCmd {
fn eq(&self, other: &ShmCtlCmd) -> bool {
*self as usize == *other as usize

662
kernel/src/ipc/syscall.rs
View File

@ -1,662 +0,0 @@
use core::{
ffi::{c_int, c_void},
sync::atomic::compiler_fence,
};
use log::{error, warn};
use system_error::SystemError;
use crate::{
arch::{
ipc::signal::{SigCode, SigFlags, SigSet, Signal},
MMArch,
},
filesystem::vfs::{
file::{File, FileMode},
FilePrivateData,
},
ipc::shm::{shm_manager_lock, IPC_PRIVATE},
libs::{align::page_align_up, spinlock::SpinLock},
mm::{
allocator::page_frame::{PageFrameCount, PhysPageFrame, VirtPageFrame},
page::{page_manager_lock_irqsave, EntryFlags, PageFlushAll},
syscall::ProtFlags,
ucontext::{AddressSpace, VMA},
VirtAddr, VmFlags,
},
process::{process_group::Pgid, Pid, ProcessManager},
syscall::{
user_access::{UserBufferReader, UserBufferWriter},
Syscall,
},
};
use super::{
pipe::{LockedPipeInode, PipeFsPrivateData},
shm::{ShmCtlCmd, ShmFlags, ShmId, ShmKey},
signal::{set_sigprocmask, SigHow},
signal_types::{
SaHandlerType, SigInfo, SigType, Sigaction, SigactionType, UserSigaction, USER_SIG_DFL,
USER_SIG_ERR, USER_SIG_IGN,
},
};
/// ### pid转换器，将输入的id转换成对应的pid或pgid
/// - 如果id < -1，则为pgid
/// - 如果id == -1，则为所有进程
/// - 如果id == 0，则为当前进程组
/// - 如果id > 0，则为pid
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum PidConverter {
All,
Pid(Pid),
Pgid(Pgid),
}
impl PidConverter {
/// ### 为 `wait` 和 `kill` 调用使用
pub fn from_id(id: i32) -> Self {
if id < -1 {
PidConverter::Pgid(Pgid::from(-id as usize))
} else if id == -1 {
PidConverter::All
} else if id == 0 {
let pgid = ProcessManager::current_pcb().pgid();
PidConverter::Pgid(pgid)
} else {
PidConverter::Pid(Pid::from(id as usize))
}
}
}
impl Syscall {
/// # 创建带参数的匿名管道
///
/// ## 参数
///
/// - `fd`: 用于返回文件描述符的数组
/// - `flags`:设置管道的参数
pub fn pipe2(fd: *mut i32, flags: FileMode) -> Result<usize, SystemError> {
if !flags
.difference(FileMode::O_CLOEXEC | FileMode::O_NONBLOCK | FileMode::O_DIRECT)
.is_empty()
{
return Err(SystemError::EINVAL);
}
let mut user_buffer = UserBufferWriter::new(fd, core::mem::size_of::<[c_int; 2]>(), true)?;
let fd = user_buffer.buffer::<i32>(0)?;
let pipe_ptr = LockedPipeInode::new();
let mut read_file = File::new(
pipe_ptr.clone(),
FileMode::O_RDONLY | (flags & FileMode::O_NONBLOCK),
)?;
read_file.private_data = SpinLock::new(FilePrivateData::Pipefs(PipeFsPrivateData::new(
FileMode::O_RDONLY,
)));
let mut write_file = File::new(
pipe_ptr.clone(),
FileMode::O_WRONLY | (flags & (FileMode::O_NONBLOCK | FileMode::O_DIRECT)),
)?;
write_file.private_data = SpinLock::new(FilePrivateData::Pipefs(PipeFsPrivateData::new(
FileMode::O_WRONLY | (flags & (FileMode::O_NONBLOCK | FileMode::O_DIRECT)),
)));
if flags.contains(FileMode::O_CLOEXEC) {
read_file.set_close_on_exec(true);
write_file.set_close_on_exec(true);
}
let fd_table_ptr = ProcessManager::current_pcb().fd_table();
let mut fd_table_guard = fd_table_ptr.write();
let read_fd = fd_table_guard.alloc_fd(read_file, None)?;
let write_fd = fd_table_guard.alloc_fd(write_file, None)?;
drop(fd_table_guard);
fd[0] = read_fd;
fd[1] = write_fd;
Ok(0)
}
/// ### 杀死一个进程
pub fn kill_process(pid: Pid, sig: Signal) -> Result<usize, SystemError> {
// 初始化signal info
let mut info = SigInfo::new(sig, 0, SigCode::User, SigType::Kill(pid));
compiler_fence(core::sync::atomic::Ordering::SeqCst);
let ret = sig
.send_signal_info(Some(&mut info), pid)
.map(|x| x as usize);
compiler_fence(core::sync::atomic::Ordering::SeqCst);
return ret;
}
/// ### 杀死一个进程组
pub fn kill_process_group(pgid: Pgid, sig: Signal) -> Result<usize, SystemError> {
let pg = ProcessManager::find_process_group(pgid).ok_or(SystemError::ESRCH)?;
let inner = pg.process_group_inner.lock();
for pcb in inner.processes.values() {
Self::kill_process(pcb.pid(), sig)?;
}
Ok(0)
}
/// ### 杀死所有进程
/// - 该函数会杀死所有进程，除了当前进程和init进程
pub fn kill_all(sig: Signal) -> Result<usize, SystemError> {
let current_pid = ProcessManager::current_pcb().pid();
let all_processes = ProcessManager::get_all_processes();
for pid in all_processes {
if pid == current_pid || pid.data() == 1 {
continue;
}
Self::kill_process(pid, sig)?;
}
Ok(0)
}
/// # kill系统调用函数
///
/// ## 参数
/// - `id`: id，等于0表示当前进程组，等于-1表示所有进程，小于0表示pgid = -id，大于0表示pid = id，
/// - `sig`: 信号值
pub fn kill(id: i32, sig: c_int) -> Result<usize, SystemError> {
let converter = PidConverter::from_id(id);
let sig = Signal::from(sig);
if sig == Signal::INVALID {
// 传入的signal数值不合法
warn!("Not a valid signal number");
return Err(SystemError::EINVAL);
}
// compiler_fence(core::sync::atomic::Ordering::SeqCst);
let retval = match converter {
PidConverter::Pid(pid) => Self::kill_process(pid, sig),
PidConverter::Pgid(pgid) => Self::kill_process_group(pgid, sig),
PidConverter::All => Self::kill_all(sig),
};
// compiler_fence(core::sync::atomic::Ordering::SeqCst);
return retval;
}
/// 通用信号注册函数
///
/// ## 参数
///
/// - `sig` 信号的值
/// - `act` 用户空间传入的 Sigaction 指针
/// - `old_act` 用户空间传入的用来保存旧 Sigaction 的指针
/// - `from_user` 用来标识这个函数调用是否来自用户空间
///
/// @return int 错误码
#[no_mangle]
pub fn sigaction(
sig: c_int,
new_act: usize,
old_act: usize,
from_user: bool,
) -> Result<usize, SystemError> {
// 请注意：用户态传进来的user_sigaction结构体类型，请注意，这个结构体与内核实际的不一样
let act: *mut UserSigaction = new_act as *mut UserSigaction;
let old_act = old_act as *mut UserSigaction;
let mut new_ka: Sigaction = Default::default();
let mut old_sigaction: Sigaction = Default::default();
// 如果传入的，新的sigaction不为空
if !act.is_null() {
// 如果参数的范围不在用户空间，则返回错误
let r = UserBufferWriter::new(act, core::mem::size_of::<Sigaction>(), from_user);
if r.is_err() {
return Err(SystemError::EFAULT);
}
let mask: SigSet = unsafe { (*act).mask };
let input_sighandler = unsafe { (*act).handler as u64 };
match input_sighandler {
USER_SIG_DFL => {
new_ka = Sigaction::DEFAULT_SIGACTION;
*new_ka.flags_mut() = unsafe { (*act).flags };
new_ka.set_restorer(None);
}
USER_SIG_IGN => {
new_ka = Sigaction::DEFAULT_SIGACTION_IGNORE;
*new_ka.flags_mut() = unsafe { (*act).flags };
new_ka.set_restorer(None);
}
_ => {
// 从用户空间获得sigaction结构体
// TODO mask是default还是用户空间传入
new_ka = Sigaction::new(
SigactionType::SaHandler(SaHandlerType::Customized(unsafe {
VirtAddr::new((*act).handler as usize)
})),
unsafe { (*act).flags },
SigSet::default(),
unsafe { Some(VirtAddr::new((*act).restorer as usize)) },
);
}
}
// TODO 如果为空，赋默认值？
// debug!("new_ka={:?}", new_ka);
// 如果用户手动给了sa_restorer，那么就置位SA_FLAG_RESTORER，否则报错。（用户必须手动指定restorer）
if new_ka.restorer().is_some() {
new_ka.flags_mut().insert(SigFlags::SA_RESTORER);
} else if new_ka.action().is_customized() {
error!(
"pid:{:?}: in sys_sigaction: User must manually sprcify a sa_restorer for signal {}.",
ProcessManager::current_pcb().pid(),
sig
);
return Err(SystemError::EINVAL);
}
*new_ka.mask_mut() = mask;
}
let sig = Signal::from(sig);
// 如果给出的信号值不合法
if sig == Signal::INVALID {
return Err(SystemError::EINVAL);
}
let retval = super::signal::do_sigaction(
sig,
if act.is_null() {
None
} else {
Some(&mut new_ka)
},
if old_act.is_null() {
None
} else {
Some(&mut old_sigaction)
},
);
//
if (retval == Ok(())) && (!old_act.is_null()) {
let r =
UserBufferWriter::new(old_act, core::mem::size_of::<UserSigaction>(), from_user);
if r.is_err() {
return Err(SystemError::EFAULT);
}
let sigaction_handler = match old_sigaction.action() {
SigactionType::SaHandler(handler) => {
if let SaHandlerType::Customized(hand) = handler {
hand
} else if handler.is_sig_ignore() {
VirtAddr::new(USER_SIG_IGN as usize)
} else if handler.is_sig_error() {
VirtAddr::new(USER_SIG_ERR as usize)
} else {
VirtAddr::new(USER_SIG_DFL as usize)
}
}
SigactionType::SaSigaction(_) => {
error!("unsupported type: SaSigaction");
VirtAddr::new(USER_SIG_DFL as usize)
}
};
unsafe {
(*old_act).handler = sigaction_handler.data() as *mut c_void;
(*old_act).flags = old_sigaction.flags();
(*old_act).mask = old_sigaction.mask();
if old_sigaction.restorer().is_some() {
(*old_act).restorer = old_sigaction.restorer().unwrap().data() as *mut c_void;
}
}
}
return retval.map(|_| 0);
}
/// # SYS_SHMGET系统调用函数，用于获取共享内存
///
/// ## 参数
///
/// - `key`: 共享内存键值
/// - `size`: 共享内存大小(bytes)
/// - `shmflg`: 共享内存标志
///
/// ## 返回值
///
/// 成功：共享内存id
/// 失败：错误码
pub fn shmget(key: ShmKey, size: usize, shmflg: ShmFlags) -> Result<usize, SystemError> {
// 暂不支持巨页
if shmflg.contains(ShmFlags::SHM_HUGETLB) {
error!("shmget: not support huge page");
return Err(SystemError::ENOSYS);
}
let mut shm_manager_guard = shm_manager_lock();
match key {
// 创建共享内存段
IPC_PRIVATE => shm_manager_guard.add(key, size, shmflg),
_ => {
// 查找key对应的共享内存段是否存在
let id = shm_manager_guard.contains_key(&key);
if let Some(id) = id {
// 不能重复创建
if shmflg.contains(ShmFlags::IPC_CREAT | ShmFlags::IPC_EXCL) {
return Err(SystemError::EEXIST);
}
// key值存在，说明有对应共享内存，返回该共享内存id
return Ok(id.data());
} else {
// key不存在且shm_flags不包含IPC_CREAT创建IPC对象标志，则返回错误码
if !shmflg.contains(ShmFlags::IPC_CREAT) {
return Err(SystemError::ENOENT);
}
// 存在创建IPC对象标志
return shm_manager_guard.add(key, size, shmflg);
}
}
}
}
/// # SYS_SHMAT系统调用函数，用于连接共享内存段
///
/// ## 参数
///
/// - `id`: 共享内存id
/// - `vaddr`: 连接共享内存的进程虚拟内存区域起始地址
/// - `shmflg`: 共享内存标志
///
/// ## 返回值
///
/// 成功：映射到共享内存的虚拟内存区域起始地址
/// 失败：错误码
pub fn shmat(id: ShmId, vaddr: VirtAddr, shmflg: ShmFlags) -> Result<usize, SystemError> {
let mut shm_manager_guard = shm_manager_lock();
let current_address_space = AddressSpace::current()?;
let mut address_write_guard = current_address_space.write();
let kernel_shm = shm_manager_guard.get_mut(&id).ok_or(SystemError::EINVAL)?;
let size = page_align_up(kernel_shm.size());
let mut phys = PhysPageFrame::new(kernel_shm.start_paddr());
let count = PageFrameCount::from_bytes(size).unwrap();
let r = match vaddr.data() {
// 找到空闲区域并映射到共享内存
0 => {
// 找到空闲区域
let region = address_write_guard
.mappings
.find_free(vaddr, size)
.ok_or(SystemError::EINVAL)?;
let vm_flags = VmFlags::from(shmflg);
let destination = VirtPageFrame::new(region.start());
let page_flags: EntryFlags<MMArch> =
EntryFlags::from_prot_flags(ProtFlags::from(vm_flags), true);
let flusher: PageFlushAll<MMArch> = PageFlushAll::new();
// 将共享内存映射到对应虚拟区域
let vma = VMA::physmap(
phys,
destination,
count,
vm_flags,
page_flags,
&mut address_write_guard.user_mapper.utable,
flusher,
)?;
// 将VMA加入到当前进程的VMA列表中
address_write_guard.mappings.insert_vma(vma);
region.start().data()
}
// 指定虚拟地址
_ => {
// 获取对应vma
let vma = address_write_guard
.mappings
.contains(vaddr)
.ok_or(SystemError::EINVAL)?;
if vma.lock_irqsave().region().start() != vaddr {
return Err(SystemError::EINVAL);
}
// 验证用户虚拟内存区域是否有效
let _ = UserBufferReader::new(vaddr.data() as *const u8, size, true)?;
// 必须在取消映射前获取到EntryFlags
let page_flags = address_write_guard
.user_mapper
.utable
.translate(vaddr)
.ok_or(SystemError::EINVAL)?
.1;
// 取消原映射
let flusher: PageFlushAll<MMArch> = PageFlushAll::new();
vma.unmap(&mut address_write_guard.user_mapper.utable, flusher);
// 将该虚拟内存区域映射到共享内存区域
let mut page_manager_guard = page_manager_lock_irqsave();
let mut virt = VirtPageFrame::new(vaddr);
for _ in 0..count.data() {
let r = unsafe {
address_write_guard.user_mapper.utable.map_phys(
virt.virt_address(),
phys.phys_address(),
page_flags,
)
}
.expect("Failed to map zero, may be OOM error");
r.flush();
// 将vma加入到对应Page的anon_vma
page_manager_guard
.get_unwrap(&phys.phys_address())
.write_irqsave()
.insert_vma(vma.clone());
phys = phys.next();
virt = virt.next();
}
// 更新vma的映射状态
vma.lock_irqsave().set_mapped(true);
vaddr.data()
}
};
// 更新最后一次连接时间
kernel_shm.update_atim();
// 映射计数增加
kernel_shm.increase_count();
Ok(r)
}
/// # SYS_SHMDT系统调用函数，用于取消对共享内存的连接
///
/// ## 参数
///
/// - `vaddr`: 需要取消映射的虚拟内存区域起始地址
///
/// ## 返回值
///
/// 成功：0
/// 失败：错误码
pub fn shmdt(vaddr: VirtAddr) -> Result<usize, SystemError> {
let current_address_space = AddressSpace::current()?;
let mut address_write_guard = current_address_space.write();
// 获取vma
let vma = address_write_guard
.mappings
.contains(vaddr)
.ok_or(SystemError::EINVAL)?;
// 判断vaddr是否为起始地址
if vma.lock_irqsave().region().start() != vaddr {
return Err(SystemError::EINVAL);
}
// 取消映射
let flusher: PageFlushAll<MMArch> = PageFlushAll::new();
vma.unmap(&mut address_write_guard.user_mapper.utable, flusher);
return Ok(0);
}
/// # SYS_SHMCTL系统调用函数，用于管理共享内存段
///
/// ## 参数
///
/// - `id`: 共享内存id
/// - `cmd`: 操作码
/// - `user_buf`: 用户缓冲区
/// - `from_user`: buf_vaddr是否来自用户地址空间
///
/// ## 返回值
///
/// 成功：0
/// 失败：错误码
pub fn shmctl(
id: ShmId,
cmd: ShmCtlCmd,
user_buf: *const u8,
from_user: bool,
) -> Result<usize, SystemError> {
let mut shm_manager_guard = shm_manager_lock();
match cmd {
// 查看共享内存元信息
ShmCtlCmd::IpcInfo => shm_manager_guard.ipc_info(user_buf, from_user),
// 查看共享内存使用信息
ShmCtlCmd::ShmInfo => shm_manager_guard.shm_info(user_buf, from_user),
// 查看id对应的共享内存信息
ShmCtlCmd::ShmStat | ShmCtlCmd::ShmtStatAny | ShmCtlCmd::IpcStat => {
shm_manager_guard.shm_stat(id, cmd, user_buf, from_user)
}
// 设置KernIpcPerm
ShmCtlCmd::IpcSet => shm_manager_guard.ipc_set(id, user_buf, from_user),
// 将共享内存段设置为可回收状态
ShmCtlCmd::IpcRmid => shm_manager_guard.ipc_rmid(id),
// 锁住共享内存段，不允许内存置换
ShmCtlCmd::ShmLock => shm_manager_guard.shm_lock(id),
// 解锁共享内存段，允许内存置换
ShmCtlCmd::ShmUnlock => shm_manager_guard.shm_unlock(id),
// 无效操作码
ShmCtlCmd::Default => Err(SystemError::EINVAL),
}
}
/// # SYS_SIGPROCMASK系统调用函数，用于设置或查询当前进程的信号屏蔽字
///
/// ## 参数
///
/// - `how`: 指示如何修改信号屏蔽字
/// - `nset`: 新的信号屏蔽字
/// - `oset`: 旧的信号屏蔽字的指针，由于可以是NULL，所以用Option包装
/// - `sigsetsize`: 信号集的大小
///
/// ## 返回值
///
/// 成功：0
/// 失败：错误码
///
/// ## 说明
/// 根据 https://man7.org/linux/man-pages/man2/sigprocmask.2.html ，传进来的oldset和newset都是指针类型，这里选择传入usize然后转换为u64的指针类型
pub fn rt_sigprocmask(
how: i32,
newset: usize,
oldset: usize,
sigsetsize: usize,
) -> Result<usize, SystemError> {
// 对应oset传进来一个NULL的情况
let oset = if oldset == 0 { None } else { Some(oldset) };
let nset = if newset == 0 { None } else { Some(newset) };
if sigsetsize != size_of::<SigSet>() {
return Err(SystemError::EFAULT);
}
let sighow = SigHow::try_from(how)?;
let mut new_set = SigSet::default();
if let Some(nset) = nset {
let reader = UserBufferReader::new(
VirtAddr::new(nset).as_ptr::<u64>(),
core::mem::size_of::<u64>(),
true,
)?;
let nset = reader.read_one_from_user::<u64>(0)?;
new_set = SigSet::from_bits_truncate(*nset);
// debug!("Get Newset: {}", &new_set.bits());
let to_remove: SigSet =
<Signal as Into<SigSet>>::into(Signal::SIGKILL) | Signal::SIGSTOP.into();
new_set.remove(to_remove);
}
let oldset_to_return = set_sigprocmask(sighow, new_set)?;
if let Some(oldset) = oset {
// debug!("Get Oldset to return: {}", &oldset_to_return.bits());
let mut writer = UserBufferWriter::new(
VirtAddr::new(oldset).as_ptr::<u64>(),
core::mem::size_of::<u64>(),
true,
)?;
writer.copy_one_to_user::<u64>(&oldset_to_return.bits(), 0)?;
}
Ok(0)
}
pub fn restart_syscall() -> Result<usize, SystemError> {
let restart_block = ProcessManager::current_pcb().restart_block().take();
if let Some(mut restart_block) = restart_block {
return restart_block.restart_fn.call(&mut restart_block.data);
} else {
// 不应该走到这里，因此kill掉当前进程及同组的进程
let pid = Pid::new(0);
let sig = Signal::SIGKILL;
let mut info = SigInfo::new(sig, 0, SigCode::Kernel, SigType::Kill(pid));
sig.send_signal_info(Some(&mut info), pid)
.expect("Failed to kill ");
return Ok(0);
}
}
#[inline(never)]
pub fn rt_sigpending(user_sigset_ptr: usize, sigsetsize: usize) -> Result<usize, SystemError> {
if sigsetsize != size_of::<SigSet>() {
return Err(SystemError::EINVAL);
}
let mut user_buffer_writer =
UserBufferWriter::new(user_sigset_ptr as *mut SigSet, size_of::<SigSet>(), true)?;
let pcb = ProcessManager::current_pcb();
let siginfo_guard = pcb.sig_info_irqsave();
let pending_set = siginfo_guard.sig_pending().signal();
let shared_pending_set = siginfo_guard.sig_shared_pending().signal();
let blocked_set = *siginfo_guard.sig_blocked();
drop(siginfo_guard);
let mut result = pending_set.union(shared_pending_set);
result = result.difference(blocked_set);
user_buffer_writer.copy_one_to_user(&result, 0)?;
Ok(0)
}
}

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pub mod sys_kill;
pub mod sys_pipe2;
mod sys_restart;
mod sys_rt_sigprocmask;
mod sys_shmat;
mod sys_shmctl;
mod sys_shmdt;
mod sys_shmget;
mod sys_sigaction;
mod sys_sigpending;
#[cfg(target_arch = "x86_64")]
pub mod sys_pipe;

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use alloc::string::ToString;
use alloc::vec::Vec;
use core::ffi::c_int;
use crate::syscall::table::FormattedSyscallParam;
use crate::syscall::table::Syscall;
use crate::{
arch::{ipc::signal::Signal, syscall::nr::SYS_KILL},
process::{process_group::Pgid, Pid, ProcessManager},
};
use log::warn;
use system_error::SystemError;
use crate::ipc::kill::{kill_all, kill_process, kill_process_group};
/// ### pid转换器，将输入的id转换成对应的pid或pgid
/// - 如果id < -1，则为pgid
/// - 如果id == -1，则为所有进程
/// - 如果id == 0，则为当前进程组
/// - 如果id > 0，则为pid
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum PidConverter {
All,
Pid(Pid),
Pgid(Pgid),
}
impl PidConverter {
/// ### 为 `wait` 和 `kill` 调用使用
pub fn from_id(id: i32) -> Self {
if id < -1 {
PidConverter::Pgid(Pgid::from(-id as usize))
} else if id == -1 {
PidConverter::All
} else if id == 0 {
let pgid = ProcessManager::current_pcb().pgid();
PidConverter::Pgid(pgid)
} else {
PidConverter::Pid(Pid::from(id as usize))
}
}
}
pub struct SysKillHandle;
impl SysKillHandle {
#[inline(always)]
fn pid(args: &[usize]) -> i32 {
// 第一个参数是id
args[0] as i32
}
#[inline(always)]
fn sig(args: &[usize]) -> c_int {
// 第二个参数是信号值
args[1] as c_int
}
}
impl Syscall for SysKillHandle {
fn num_args(&self) -> usize {
2
}
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let id = Self::pid(args);
let sig_c_int = Self::sig(args);
let converter = PidConverter::from_id(id);
let sig = Signal::from(sig_c_int);
if sig == Signal::INVALID {
warn!("Not a valid signal number");
return Err(SystemError::EINVAL);
}
match converter {
PidConverter::Pid(pid) => kill_process(pid, sig),
PidConverter::Pgid(pgid) => kill_process_group(pgid, sig),
PidConverter::All => kill_all(sig),
}
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
vec![
FormattedSyscallParam::new("pid", Self::pid(args).to_string()),
FormattedSyscallParam::new("sig", Self::sig(args).to_string()),
]
}
}
// 注册系统调用
syscall_table_macros::declare_syscall!(SYS_KILL, SysKillHandle);

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use super::sys_pipe2::do_kernel_pipe2;
use crate::arch::syscall::nr::SYS_PIPE;
use crate::{
filesystem::vfs::file::FileMode,
syscall::table::{FormattedSyscallParam, Syscall},
};
use alloc::vec::Vec;
use core::ffi::c_int;
use system_error::SystemError;
pub struct SysPipeHandle;
impl SysPipeHandle {
#[inline(always)]
fn pipefd(args: &[usize]) -> *mut i32 {
// 第一个参数是fd指针
args[0] as *mut c_int
}
}
impl Syscall for SysPipeHandle {
fn num_args(&self) -> usize {
1 // pipefd
}
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let pipefd = Self::pipefd(args);
if pipefd.is_null() {
return Err(SystemError::EFAULT);
} else {
do_kernel_pipe2(pipefd, FileMode::empty())
}
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
let fd_ptr = Self::pipefd(args);
vec![FormattedSyscallParam::new(
"fd_ptr",
format!("{}", fd_ptr as usize),
)]
}
}
syscall_table_macros::declare_syscall!(SYS_PIPE, SysPipeHandle);

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use crate::{
arch::syscall::nr::SYS_PIPE2,
filesystem::vfs::{
file::{File, FileMode},
FilePrivateData,
},
ipc::pipe::{LockedPipeInode, PipeFsPrivateData},
libs::spinlock::SpinLock,
process::ProcessManager,
syscall::{
table::{FormattedSyscallParam, Syscall},
user_access::UserBufferWriter,
},
};
use alloc::vec::Vec;
use core::ffi::c_int;
use system_error::SystemError;
pub struct SysPipe2Handle;
// Extracted core logic for pipe2
// pub(super) makes it visible to other modules in kernel/src/ipc/syscall/
pub(super) fn do_kernel_pipe2(fd: *mut i32, flags: FileMode) -> Result<usize, SystemError> {
if !flags
.difference(FileMode::O_CLOEXEC | FileMode::O_NONBLOCK | FileMode::O_DIRECT)
.is_empty()
{
return Err(SystemError::EINVAL);
}
let mut user_buffer = UserBufferWriter::new(fd, core::mem::size_of::<[c_int; 2]>(), true)?;
let fd = user_buffer.buffer::<i32>(0)?;
let pipe_ptr = LockedPipeInode::new();
let mut read_file = File::new(
pipe_ptr.clone(),
FileMode::O_RDONLY | (flags & FileMode::O_NONBLOCK),
)?;
read_file.private_data = SpinLock::new(FilePrivateData::Pipefs(PipeFsPrivateData::new(
FileMode::O_RDONLY,
)));
let mut write_file = File::new(
pipe_ptr.clone(),
FileMode::O_WRONLY | (flags & (FileMode::O_NONBLOCK | FileMode::O_DIRECT)),
)?;
write_file.private_data = SpinLock::new(FilePrivateData::Pipefs(PipeFsPrivateData::new(
FileMode::O_WRONLY | (flags & (FileMode::O_NONBLOCK | FileMode::O_DIRECT)),
)));
if flags.contains(FileMode::O_CLOEXEC) {
read_file.set_close_on_exec(true);
write_file.set_close_on_exec(true);
}
let fd_table_ptr = ProcessManager::current_pcb().fd_table();
let mut fd_table_guard = fd_table_ptr.write();
let read_fd = fd_table_guard.alloc_fd(read_file, None)?;
let write_fd = fd_table_guard.alloc_fd(write_file, None)?;
drop(fd_table_guard);
fd[0] = read_fd;
fd[1] = write_fd;
Ok(0)
}
impl SysPipe2Handle {
#[inline(always)]
fn pipefd(args: &[usize]) -> *mut i32 {
args[0] as *mut c_int
}
#[inline(always)]
fn flags(args: &[usize]) -> FileMode {
FileMode::from_bits_truncate(args[1] as u32)
}
}
impl Syscall for SysPipe2Handle {
fn num_args(&self) -> usize {
2 // fd_ptr, flags
}
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let fd_ptr = Self::pipefd(args);
if fd_ptr.is_null() {
return Err(SystemError::EFAULT);
} else {
let flags = FileMode::from_bits_truncate(args[1] as u32);
do_kernel_pipe2(fd_ptr, flags)
}
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
let fd_ptr = Self::pipefd(args);
vec![
FormattedSyscallParam::new("fd_ptr", format!("{}", fd_ptr as usize)), // Format pointer as hex
FormattedSyscallParam::new("flags", format!("{}", Self::flags(args).bits())),
]
}
}
syscall_table_macros::declare_syscall!(SYS_PIPE2, SysPipe2Handle);

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kernel/src/ipc/syscall/sys_restart.rs Normal file
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use super::super::signal_types::{SigInfo, SigType};
use crate::{
alloc::vec::Vec,
arch::ipc::signal::{SigCode, Signal},
arch::syscall::nr::SYS_RESTART_SYSCALL,
process::{Pid, ProcessManager},
syscall::table::{FormattedSyscallParam, Syscall},
};
use syscall_table_macros::declare_syscall;
use system_error::SystemError;
pub struct SysRestartHandle;
/// # SYS_RESTART_SYSCALL 系统调用函数，用于重启被信号中断的系统调用
///
/// ## 返回值
///
/// 根据被重启的系统调用决定
pub(super) fn do_kernel_restart_syscall() -> Result<usize, SystemError> {
let restart_block = ProcessManager::current_pcb().restart_block().take();
if let Some(mut restart_block) = restart_block {
return restart_block.restart_fn.call(&mut restart_block.data);
} else {
// 不应该走到这里，因此kill掉当前进程及同组的进程
let pid = Pid::new(0);
let sig = Signal::SIGKILL;
let mut info = SigInfo::new(sig, 0, SigCode::Kernel, SigType::Kill(pid));
sig.send_signal_info(Some(&mut info), pid)
.expect("Failed to kill ");
return Ok(0);
}
}
impl Syscall for SysRestartHandle {
fn num_args(&self) -> usize {
0 // restart_syscall 通常没有参数
}
fn entry_format(&self, _args: &[usize]) -> Vec<FormattedSyscallParam> {
Vec::new() // 没有参数，返回空Vec
}
fn handle(&self, _args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
do_kernel_restart_syscall()
}
}
declare_syscall!(SYS_RESTART_SYSCALL, SysRestartHandle);

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kernel/src/ipc/syscall/sys_rt_sigprocmask.rs Normal file
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use crate::alloc::vec::Vec;
use crate::{
arch::ipc::signal::{SigSet, Signal},
arch::syscall::nr::SYS_RT_SIGPROCMASK,
ipc::signal::{set_sigprocmask, SigHow},
mm::VirtAddr,
syscall::{
table::{FormattedSyscallParam, Syscall},
user_access::{UserBufferReader, UserBufferWriter},
},
};
use core::mem::size_of;
use syscall_table_macros::declare_syscall;
use system_error::SystemError; // 添加 Vec
pub struct SysRtSigprocmaskHandle;
/// # SYS_SIGPROCMASK系统调用函数，用于设置或查询当前进程的信号屏蔽字
///
/// ## 参数
///
/// - `how`: 指示如何修改信号屏蔽字
/// - `nset`: 新的信号屏蔽字
/// - `oset`: 旧的信号屏蔽字的指针，由于可以是NULL，所以用Option包装
/// - `sigsetsize`: 信号集的大小
///
/// ## 返回值
///
/// 成功：0
/// 失败：错误码
///
/// ## 说明
/// 根据 https://man7.org/linux/man-pages/man2/sigprocmask.2.html ，传进来的oldset和newset都是指针类型，这里选择传入usize然后转换为u64的指针类型
pub(super) fn do_kernel_rt_sigprocmask(
how: i32,
newset: usize,
oldset: usize,
sigsetsize: usize,
) -> Result<usize, SystemError> {
// 对应oset传进来一个NULL的情况
let oset = if oldset == 0 { None } else { Some(oldset) };
let nset = if newset == 0 { None } else { Some(newset) };
if sigsetsize != size_of::<SigSet>() {
return Err(SystemError::EFAULT);
}
let sighow = SigHow::try_from(how)?;
let mut new_set = SigSet::default();
if let Some(nset) = nset {
let reader = UserBufferReader::new(
VirtAddr::new(nset).as_ptr::<u64>(),
core::mem::size_of::<u64>(),
true,
)?;
let nset = reader.read_one_from_user::<u64>(0)?;
new_set = SigSet::from_bits_truncate(*nset);
// debug!("Get Newset: {}", &new_set.bits());
let to_remove: SigSet =
<Signal as Into<SigSet>>::into(Signal::SIGKILL) | Signal::SIGSTOP.into();
new_set.remove(to_remove);
}
let oldset_to_return = set_sigprocmask(sighow, new_set)?;
if let Some(oldset) = oset {
// debug!("Get Oldset to return: {}", &oldset_to_return.bits());
let mut writer = UserBufferWriter::new(
VirtAddr::new(oldset).as_ptr::<u64>(),
core::mem::size_of::<u64>(),
true,
)?;
writer.copy_one_to_user::<u64>(&oldset_to_return.bits(), 0)?;
}
Ok(0)
}
impl SysRtSigprocmaskHandle {
#[inline(always)]
fn how(args: &[usize]) -> i32 {
// 第一个参数是 how
args[0] as i32
}
#[inline(always)]
fn nset(args: &[usize]) -> usize {
// 第二个参数是新信号集的指针
args[1]
}
#[inline(always)]
fn oset(args: &[usize]) -> usize {
// 第三个参数是旧信号集的指针
args[2]
}
#[inline(always)]
fn sigsetsize(args: &[usize]) -> usize {
// 第四个参数是 sigset_t 的大小
args[3]
}
}
impl Syscall for SysRtSigprocmaskHandle {
fn num_args(&self) -> usize {
4
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
let how = Self::how(args);
let nset_ptr = Self::nset(args);
let oset_ptr = Self::oset(args);
let sigsetsize = Self::sigsetsize(args);
vec![
FormattedSyscallParam::new("how", format!("{:#x}", how)),
FormattedSyscallParam::new("nset", format!("{:#x}", nset_ptr)),
FormattedSyscallParam::new("oset", format!("{:#x}", oset_ptr)),
FormattedSyscallParam::new("sigsetsize", format!("{}", sigsetsize)),
]
}
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let how = Self::how(args);
let nset = Self::nset(args);
let oset = Self::oset(args);
let sigsetsize = Self::sigsetsize(args);
do_kernel_rt_sigprocmask(how, nset, oset, sigsetsize)
}
}
declare_syscall!(SYS_RT_SIGPROCMASK, SysRtSigprocmaskHandle);

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use crate::alloc::vec::Vec;
use crate::syscall::table::FormattedSyscallParam;
use crate::{
arch::syscall::nr::SYS_SHMAT,
arch::MMArch,
ipc::shm::{shm_manager_lock, ShmFlags, ShmId},
libs::align::page_align_up,
mm::{
allocator::page_frame::{PageFrameCount, PhysPageFrame, VirtPageFrame},
page::{page_manager_lock_irqsave, EntryFlags, PageFlushAll},
syscall::ProtFlags,
ucontext::{AddressSpace, VMA},
VirtAddr, VmFlags,
},
syscall::{table::Syscall, user_access::UserBufferReader},
};
use syscall_table_macros::declare_syscall;
use system_error::SystemError;
pub struct SysShmatHandle;
/// # SYS_SHMAT系统调用函数，用于连接共享内存段
///
/// ## 参数
///
/// - `id`: 共享内存id
/// - `vaddr`: 连接共享内存的进程虚拟内存区域起始地址
/// - `shmflg`: 共享内存标志
///
/// ## 返回值
///
/// 成功：映射到共享内存的虚拟内存区域起始地址
/// 失败：错误码
pub(super) fn do_kernel_shmat(
id: ShmId,
vaddr: VirtAddr,
shmflg: ShmFlags,
) -> Result<usize, SystemError> {
let mut shm_manager_guard = shm_manager_lock();
let current_address_space = AddressSpace::current()?;
let mut address_write_guard = current_address_space.write();
let kernel_shm = shm_manager_guard.get_mut(&id).ok_or(SystemError::EINVAL)?;
let size = page_align_up(kernel_shm.size());
let mut phys = PhysPageFrame::new(kernel_shm.start_paddr());
let count = PageFrameCount::from_bytes(size).unwrap();
let r = match vaddr.data() {
// 找到空闲区域并映射到共享内存
0 => {
// 找到空闲区域
let region = address_write_guard
.mappings
.find_free(vaddr, size)
.ok_or(SystemError::EINVAL)?;
let vm_flags = VmFlags::from(shmflg);
let destination = VirtPageFrame::new(region.start());
let page_flags: EntryFlags<MMArch> =
EntryFlags::from_prot_flags(ProtFlags::from(vm_flags), true);
let flusher: PageFlushAll<MMArch> = PageFlushAll::new();
// 将共享内存映射到对应虚拟区域
let vma = VMA::physmap(
phys,
destination,
count,
vm_flags,
page_flags,
&mut address_write_guard.user_mapper.utable,
flusher,
)?;
// 将VMA加入到当前进程的VMA列表中
address_write_guard.mappings.insert_vma(vma);
region.start().data()
}
// 指定虚拟地址
_ => {
// 获取对应vma
let vma = address_write_guard
.mappings
.contains(vaddr)
.ok_or(SystemError::EINVAL)?;
if vma.lock_irqsave().region().start() != vaddr {
return Err(SystemError::EINVAL);
}
// 验证用户虚拟内存区域是否有效
let _ = UserBufferReader::new(vaddr.data() as *const u8, size, true)?;
// 必须在取消映射前获取到EntryFlags
let page_flags = address_write_guard
.user_mapper
.utable
.translate(vaddr)
.ok_or(SystemError::EINVAL)?
.1;
// 取消原映射
let flusher: PageFlushAll<MMArch> = PageFlushAll::new();
vma.unmap(&mut address_write_guard.user_mapper.utable, flusher);
// 将该虚拟内存区域映射到共享内存区域
let mut page_manager_guard = page_manager_lock_irqsave();
let mut virt = VirtPageFrame::new(vaddr);
for _ in 0..count.data() {
let r = unsafe {
address_write_guard.user_mapper.utable.map_phys(
virt.virt_address(),
phys.phys_address(),
page_flags,
)
}
.expect("Failed to map zero, may be OOM error");
r.flush();
// 将vma加入到对应Page的anon_vma
page_manager_guard
.get_unwrap(&phys.phys_address())
.write_irqsave()
.insert_vma(vma.clone());
phys = phys.next();
virt = virt.next();
}
// 更新vma的映射状态
vma.lock_irqsave().set_mapped(true);
vaddr.data()
}
};
// 更新最后一次连接时间
kernel_shm.update_atim();
// 映射计数增加
kernel_shm.increase_count();
Ok(r)
}
impl SysShmatHandle {
#[inline(always)]
fn id(args: &[usize]) -> ShmId {
ShmId::new(args[0]) // 更正 ShmIT 为 ShmId
}
#[inline(always)]
fn vaddr(args: &[usize]) -> VirtAddr {
VirtAddr::new(args[1])
}
#[inline(always)]
fn shmflg(args: &[usize]) -> ShmFlags {
ShmFlags::from_bits_truncate(args[2] as u32)
}
}
impl Syscall for SysShmatHandle {
fn num_args(&self) -> usize {
3
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
vec![
FormattedSyscallParam::new("id", format!("{}", Self::id(args).data())),
FormattedSyscallParam::new("vaddr", format!("{}", Self::vaddr(args).data())),
FormattedSyscallParam::new("shmflg", format!("{}", Self::shmflg(args).bits())),
]
}
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let id = Self::id(args);
let vaddr = Self::vaddr(args);
let shmflg = Self::shmflg(args);
do_kernel_shmat(id, vaddr, shmflg)
}
}
declare_syscall!(SYS_SHMAT, SysShmatHandle);

92
kernel/src/ipc/syscall/sys_shmctl.rs Normal file
View File

@ -0,0 +1,92 @@
use crate::alloc::vec::Vec;
use crate::{
arch::syscall::nr::SYS_SHMCTL,
ipc::shm::{shm_manager_lock, ShmCtlCmd, ShmId},
syscall::table::{FormattedSyscallParam, Syscall},
};
use syscall_table_macros::declare_syscall;
use system_error::SystemError;
pub struct SysShmctlHandle;
/// # SYS_SHMCTL系统调用函数，用于管理共享内存段
///
/// ## 参数
///
/// - `id`: 共享内存id
/// - `cmd`: 操作码
/// - `user_buf`: 用户缓冲区
/// - `from_user`: buf_vaddr是否来自用户地址空间
///
/// ## 返回值
///
/// 成功：0
/// 失败：错误码
pub(super) fn do_kernel_shmctl(
id: ShmId,
cmd: ShmCtlCmd,
user_buf: *const u8,
from_user: bool,
) -> Result<usize, SystemError> {
let mut shm_manager_guard = shm_manager_lock();
match cmd {
// 查看共享内存元信息
ShmCtlCmd::IpcInfo => shm_manager_guard.ipc_info(user_buf, from_user),
// 查看共享内存使用信息
ShmCtlCmd::ShmInfo => shm_manager_guard.shm_info(user_buf, from_user),
// 查看id对应的共享内存信息
ShmCtlCmd::ShmStat | ShmCtlCmd::ShmtStatAny | ShmCtlCmd::IpcStat => {
shm_manager_guard.shm_stat(id, cmd, user_buf, from_user)
}
// 设置KernIpcPerm
ShmCtlCmd::IpcSet => shm_manager_guard.ipc_set(id, user_buf, from_user),
// 将共享内存段设置为可回收状态
ShmCtlCmd::IpcRmid => shm_manager_guard.ipc_rmid(id),
// 锁住共享内存段，不允许内存置换
ShmCtlCmd::ShmLock => shm_manager_guard.shm_lock(id),
// 解锁共享内存段，允许内存置换
ShmCtlCmd::ShmUnlock => shm_manager_guard.shm_unlock(id),
// 无效操作码
ShmCtlCmd::Default => Err(SystemError::EINVAL),
}
}
impl SysShmctlHandle {
#[inline(always)]
fn id(args: &[usize]) -> ShmId {
ShmId::new(args[0]) // Assuming ShmId::new takes usize or can infer from args[0]
}
#[inline(always)]
fn cmd(args: &[usize]) -> ShmCtlCmd {
ShmCtlCmd::from(args[1])
}
#[inline(always)]
fn user_buf(args: &[usize]) -> *const u8 {
args[2] as *const u8 // Assuming args[2] is a pointer to user buffer
}
}
impl Syscall for SysShmctlHandle {
fn num_args(&self) -> usize {
3
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
vec![
FormattedSyscallParam::new("shmid", format!("{}", Self::id(args).data())),
FormattedSyscallParam::new("cmd", format!("{}", Self::cmd(args))),
FormattedSyscallParam::new("buf", format!("{:#x}", Self::user_buf(args) as usize)),
]
}
fn handle(&self, args: &[usize], from_user: bool) -> Result<usize, SystemError> {
let id = Self::id(args);
let cmd = Self::cmd(args);
let user_buf = Self::user_buf(args);
do_kernel_shmctl(id, cmd, user_buf, from_user)
}
}
declare_syscall!(SYS_SHMCTL, SysShmctlHandle);

67
kernel/src/ipc/syscall/sys_shmdt.rs Normal file
View File

@ -0,0 +1,67 @@
use crate::mm::page::PageFlushAll;
use crate::syscall::table::FormattedSyscallParam;
use crate::{
arch::syscall::nr::SYS_SHMDT,
arch::MMArch,
mm::{ucontext::AddressSpace, VirtAddr},
syscall::table::Syscall,
};
use alloc::vec::Vec;
use syscall_table_macros::declare_syscall;
use system_error::SystemError;
pub struct SysShmdtHandle;
impl SysShmdtHandle {
#[inline(always)]
fn vaddr(args: &[usize]) -> VirtAddr {
VirtAddr::new(args[0])
}
}
impl Syscall for SysShmdtHandle {
fn num_args(&self) -> usize {
1
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
vec![FormattedSyscallParam::new(
"vaddr",
format!("{}", Self::vaddr(args).data()),
)]
}
/// # SYS_SHMDT系统调用函数，用于取消对共享内存的连接
///
/// ## 参数
///
/// - `vaddr`: 需要取消映射的虚拟内存区域起始地址
///
/// ## 返回值
///
/// 成功：0
/// 失败：错误码
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let vaddr = Self::vaddr(args);
let current_address_space = AddressSpace::current()?;
let mut address_write_guard = current_address_space.write();
// 获取vma
let vma = address_write_guard
.mappings
.contains(vaddr)
.ok_or(SystemError::EINVAL)?;
// 判断vaddr是否为起始地址
if vma.lock_irqsave().region().start() != vaddr {
return Err(SystemError::EINVAL);
}
// 取消映射
let flusher: PageFlushAll<MMArch> = PageFlushAll::new();
vma.unmap(&mut address_write_guard.user_mapper.utable, flusher);
return Ok(0);
}
}
declare_syscall!(SYS_SHMDT, SysShmdtHandle);

110
kernel/src/ipc/syscall/sys_shmget.rs Normal file
View File

@ -0,0 +1,110 @@
use crate::alloc::vec::Vec;
use crate::syscall::table::FormattedSyscallParam;
use crate::{
arch::syscall::nr::SYS_SHMGET,
ipc::shm::{shm_manager_lock, ShmFlags, ShmKey, IPC_PRIVATE},
syscall::table::Syscall,
};
use log::error;
use syscall_table_macros::declare_syscall;
use system_error::SystemError;
pub struct SysShmgetHandle;
/// # SYS_SHMGET系统调用函数，用于获取共享内存
///
/// ## 参数
///
/// - `key`: 共享内存键值
/// - `size`: 共享内存大小(bytes)
/// - `shmflg`: 共享内存标志
///
/// ## 返回值
///
/// 成功：共享内存id
/// 失败：错误码
pub(super) fn do_kernel_shmget(
key: ShmKey,
size: usize,
shmflg: ShmFlags,
) -> Result<usize, SystemError> {
// 暂不支持巨页
if shmflg.contains(ShmFlags::SHM_HUGETLB) {
error!("shmget: not support huge page");
return Err(SystemError::ENOSYS);
}
let mut shm_manager_guard = shm_manager_lock();
match key {
// 创建共享内存段
IPC_PRIVATE => shm_manager_guard.add(key, size, shmflg),
_ => {
// 查找key对应的共享内存段是否存在
let id = shm_manager_guard.contains_key(&key);
if let Some(id) = id {
// 不能重复创建
if shmflg.contains(ShmFlags::IPC_CREAT | ShmFlags::IPC_EXCL) {
return Err(SystemError::EEXIST);
}
// key值存在，说明有对应共享内存，返回该共享内存id
return Ok(id.data());
} else {
// key不存在且shm_flags不包含IPC_CREAT创建IPC对象标志，则返回错误码
if !shmflg.contains(ShmFlags::IPC_CREAT) {
return Err(SystemError::ENOENT);
}
// 存在创建IPC对象标志
return shm_manager_guard.add(key, size, shmflg);
}
}
}
}
impl SysShmgetHandle {
#[inline(always)]
fn key(args: &[usize]) -> ShmKey {
// 第一个参数是共享内存的key
// In the old code: ShmKey::new(args[0])
// ShmKey is likely a type alias for i32 or similar, args[0] is usize
ShmKey::new(args[0]) // Assuming ShmKey::new takes i32
}
#[inline(always)]
fn size(args: &[usize]) -> usize {
// 第二个参数是共享内存的大小
args[1]
}
#[inline(always)]
fn shmflg(args: &[usize]) -> ShmFlags {
// 第三个参数是共享内存的标志
// In the old code: ShmFlags::from_bits_truncate(args[2] as u32)
ShmFlags::from_bits_truncate(args[2] as u32)
}
}
impl Syscall for SysShmgetHandle {
fn num_args(&self) -> usize {
3 // key, size, shmflg
}
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let key = Self::key(args);
let size = Self::size(args);
let shmflg = Self::shmflg(args);
do_kernel_shmget(key, size, shmflg)
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
vec![
FormattedSyscallParam::new("key", format!("{}", Self::key(args).data())),
// 使用 format! 宏将 usize 类型的 size 转换为 String
FormattedSyscallParam::new("size", format!("{}", Self::size(args))),
FormattedSyscallParam::new("shmflg", format!("{:#x}", Self::shmflg(args).bits())),
]
}
}
declare_syscall!(SYS_SHMGET, SysShmgetHandle);

191
kernel/src/ipc/syscall/sys_sigaction.rs Normal file
View File

@ -0,0 +1,191 @@
use super::super::signal_types::{
SaHandlerType, Sigaction, SigactionType, UserSigaction, USER_SIG_DFL, USER_SIG_ERR,
USER_SIG_IGN,
};
use crate::arch::syscall::nr::SYS_RT_SIGACTION;
use crate::syscall::table::{FormattedSyscallParam, Syscall};
use crate::{
arch::ipc::signal::{SigFlags, SigSet, Signal},
mm::VirtAddr,
process::ProcessManager,
syscall::user_access::UserBufferWriter,
};
use alloc::vec::Vec;
use core::ffi::{c_int, c_void};
use log::error;
use system_error::SystemError;
pub struct SysSigactionHandle;
/// 通用信号注册函数
///
/// ## 参数
///
/// - `sig` 信号的值
/// - `act` 用户空间传入的 Sigaction 指针
/// - `old_act` 用户空间传入的用来保存旧 Sigaction 的指针
/// - `from_user` 用来标识这个函数调用是否来自用户空间
///
/// @return int 错误码
#[no_mangle]
pub(super) fn do_kernel_sigaction(
sig: c_int,
new_act: usize,
old_act: usize,
from_user: bool,
) -> Result<usize, SystemError> {
// 请注意：用户态传进来的user_sigaction结构体类型，请注意，这个结构体与内核实际的不一样
let act: *mut UserSigaction = new_act as *mut UserSigaction;
let old_act = old_act as *mut UserSigaction;
let mut new_ka: Sigaction = Default::default();
let mut old_sigaction: Sigaction = Default::default();
// 如果传入的，新的sigaction不为空
if !act.is_null() {
// 如果参数的范围不在用户空间，则返回错误
let r = UserBufferWriter::new(act, core::mem::size_of::<Sigaction>(), from_user);
if r.is_err() {
return Err(SystemError::EFAULT);
}
let mask: SigSet = unsafe { (*act).mask };
let input_sighandler = unsafe { (*act).handler as u64 };
match input_sighandler {
USER_SIG_DFL => {
new_ka = Sigaction::DEFAULT_SIGACTION;
*new_ka.flags_mut() = unsafe { (*act).flags };
new_ka.set_restorer(None);
}
USER_SIG_IGN => {
new_ka = Sigaction::DEFAULT_SIGACTION_IGNORE;
*new_ka.flags_mut() = unsafe { (*act).flags };
new_ka.set_restorer(None);
}
_ => {
// 从用户空间获得sigaction结构体
// TODO mask是default还是用户空间传入
new_ka = Sigaction::new(
SigactionType::SaHandler(SaHandlerType::Customized(unsafe {
VirtAddr::new((*act).handler as usize)
})),
unsafe { (*act).flags },
SigSet::default(),
unsafe { Some(VirtAddr::new((*act).restorer as usize)) },
);
}
}
// TODO 如果为空，赋默认值？
// debug!("new_ka={:?}", new_ka);
// 如果用户手动给了sa_restorer，那么就置位SA_FLAG_RESTORER，否则报错。（用户必须手动指定restorer）
if new_ka.restorer().is_some() {
new_ka.flags_mut().insert(SigFlags::SA_RESTORER);
} else if new_ka.action().is_customized() {
error!(
"pid:{:?}: in sys_sigaction: User must manually sprcify a sa_restorer for signal {}.",
ProcessManager::current_pcb().pid(),
sig
);
return Err(SystemError::EINVAL);
}
*new_ka.mask_mut() = mask;
}
let sig = Signal::from(sig);
// 如果给出的信号值不合法
if sig == Signal::INVALID {
return Err(SystemError::EINVAL);
}
let retval = super::super::signal::do_sigaction(
sig,
if act.is_null() {
None
} else {
Some(&mut new_ka)
},
if old_act.is_null() {
None
} else {
Some(&mut old_sigaction)
},
);
//
if (retval == Ok(())) && (!old_act.is_null()) {
let r = UserBufferWriter::new(old_act, core::mem::size_of::<UserSigaction>(), from_user);
if r.is_err() {
return Err(SystemError::EFAULT);
}
let sigaction_handler = match old_sigaction.action() {
SigactionType::SaHandler(handler) => {
if let SaHandlerType::Customized(hand) = handler {
hand
} else if handler.is_sig_ignore() {
VirtAddr::new(USER_SIG_IGN as usize)
} else if handler.is_sig_error() {
VirtAddr::new(USER_SIG_ERR as usize)
} else {
VirtAddr::new(USER_SIG_DFL as usize)
}
}
SigactionType::SaSigaction(_) => {
error!("unsupported type: SaSigaction");
VirtAddr::new(USER_SIG_DFL as usize)
}
};
unsafe {
(*old_act).handler = sigaction_handler.data() as *mut c_void;
(*old_act).flags = old_sigaction.flags();
(*old_act).mask = old_sigaction.mask();
if old_sigaction.restorer().is_some() {
(*old_act).restorer = old_sigaction.restorer().unwrap().data() as *mut c_void;
}
}
}
return retval.map(|_| 0);
}
impl SysSigactionHandle {
#[inline(always)]
fn sig(args: &[usize]) -> c_int {
// 第一个参数是信号值
args[0] as c_int
}
#[inline(always)]
fn act(args: &[usize]) -> usize {
// 第二个参数是用户空间传入的 Sigaction 指针
args[1]
}
#[inline(always)]
fn old_act(args: &[usize]) -> usize {
// 第三个参数是用户空间传入的用来保存旧 Sigaction 的指针
args[2]
}
}
impl Syscall for SysSigactionHandle {
fn num_args(&self) -> usize {
3
}
#[no_mangle]
fn handle(&self, args: &[usize], from_user: bool) -> Result<usize, SystemError> {
let sig = Self::sig(args);
let act = Self::act(args);
let old_act = Self::old_act(args);
do_kernel_sigaction(sig, act, old_act, from_user)
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
vec![
FormattedSyscallParam::new("sig", format!("{}", Self::sig(args))),
FormattedSyscallParam::new("act", format!("{:#x}", Self::act(args))),
FormattedSyscallParam::new("old_act", format!("{:#x}", Self::old_act(args))),
]
}
}
syscall_table_macros::declare_syscall!(SYS_RT_SIGACTION, SysSigactionHandle);

76
kernel/src/ipc/syscall/sys_sigpending.rs Normal file
View File

@ -0,0 +1,76 @@
use crate::{
alloc::vec::Vec,
arch::ipc::signal::SigSet,
arch::syscall::nr::SYS_RT_SIGPENDING,
process::ProcessManager,
syscall::{
table::{FormattedSyscallParam, Syscall},
user_access::UserBufferWriter,
},
};
use core::mem::size_of;
use syscall_table_macros::declare_syscall;
use system_error::SystemError;
pub struct SysSigpendingHandle;
#[inline(never)]
pub(super) fn do_kernel_rt_sigpending(
user_sigset_ptr: usize,
sigsetsize: usize,
) -> Result<usize, SystemError> {
if sigsetsize != size_of::<SigSet>() {
return Err(SystemError::EINVAL);
}
let mut user_buffer_writer =
UserBufferWriter::new(user_sigset_ptr as *mut SigSet, size_of::<SigSet>(), true)?;
let pcb = ProcessManager::current_pcb();
let siginfo_guard = pcb.sig_info_irqsave();
let pending_set = siginfo_guard.sig_pending().signal();
let shared_pending_set = siginfo_guard.sig_shared_pending().signal();
let blocked_set = *siginfo_guard.sig_blocked();
drop(siginfo_guard);
let mut result = pending_set.union(shared_pending_set);
result = result.difference(blocked_set);
user_buffer_writer.copy_one_to_user(&result, 0)?;
Ok(0)
}
impl Syscall for SysSigpendingHandle {
fn num_args(&self) -> usize {
2 // sigpending(sigset_t *set)
}
fn entry_format(&self, args: &[usize]) -> Vec<FormattedSyscallParam> {
vec![
FormattedSyscallParam::new("user_sigset_ptr", format!("{}", args[0])),
FormattedSyscallParam::new("sigsetsize", format!("{}", args[1])),
]
}
fn handle(&self, args: &[usize], _from_user: bool) -> Result<usize, SystemError> {
let user_sigset = SysSigpendingHandle::user_sigset_ptr(args);
let size = SysSigpendingHandle::sigsetsize(args);
do_kernel_rt_sigpending(user_sigset, size)
}
}
impl SysSigpendingHandle {
#[inline(always)]
fn user_sigset_ptr(args: &[usize]) -> usize {
// 第一个参数是用户空间信号集的指针
args[0]
}
#[inline(always)]
fn sigsetsize(args: &[usize]) -> usize {
// 第二个参数是 sigset_t 的大小
args[1]
}
}
declare_syscall!(SYS_RT_SIGPENDING, SysSigpendingHandle);

2
kernel/src/process/exit.rs
View File

@ -4,7 +4,7 @@ use system_error::SystemError;
use crate::{
arch::ipc::signal::{SigChildCode, Signal},
ipc::syscall::PidConverter,
ipc::syscall::sys_kill::PidConverter,
sched::{schedule, SchedMode},
syscall::user_access::UserBufferWriter,
time::{sleep::nanosleep, Duration},

4
kernel/src/process/mod.rs
View File

@ -67,7 +67,7 @@ use crate::{
cpu::{AtomicProcessorId, ProcessorId},
kick_cpu,
},
syscall::{user_access::clear_user, Syscall},
syscall::user_access::clear_user,
};
use timer::AlarmTimer;
@ -386,7 +386,7 @@ impl ProcessManager {
return;
}
let parent_pcb = r.unwrap();
let r = Syscall::kill_process(parent_pcb.pid(), Signal::SIGCHLD);
let r = crate::ipc::kill::kill_process(parent_pcb.pid(), Signal::SIGCHLD);
if r.is_err() {
warn!(
"failed to send kill signal to {:?}'s parent pcb {:?}",

75
kernel/src/syscall/mod.rs
View File

@ -6,7 +6,6 @@ use core::{
use crate::{
arch::syscall::nr::*,
filesystem::vfs::syscall::PosixStatfs,
ipc::shm::{ShmCtlCmd, ShmFlags, ShmId, ShmKey},
libs::{futex::constant::FutexFlag, rand::GRandFlags},
mm::{page::PAGE_4K_SIZE, syscall::MremapFlags},
net::syscall::MsgHdr,
@ -29,7 +28,6 @@ use crate::{
arch::{interrupt::TrapFrame, MMArch},
filesystem::vfs::{
fcntl::{AtFlags, FcntlCommand},
file::FileMode,
syscall::{ModeType, UtimensFlags},
MAX_PATHLEN,
},
@ -314,27 +312,6 @@ impl Syscall {
}
SYS_CLOCK => Self::clock(),
#[cfg(target_arch = "x86_64")]
SYS_PIPE => {
let pipefd: *mut i32 = args[0] as *mut c_int;
if pipefd.is_null() {
Err(SystemError::EFAULT)
} else {
Self::pipe2(pipefd, FileMode::empty())
}
}
SYS_PIPE2 => {
let pipefd: *mut i32 = args[0] as *mut c_int;
let arg1 = args[1];
if pipefd.is_null() {
Err(SystemError::EFAULT)
} else {
let flags = FileMode::from_bits_truncate(arg1 as u32);
Self::pipe2(pipefd, flags)
}
}
SYS_UNLINKAT => {
let dirfd = args[0] as i32;
let path = args[1] as *const u8;
@ -383,20 +360,6 @@ impl Syscall {
let path = args[0] as *const u8;
Self::unlink(path)
}
SYS_KILL => {
let pid = args[0] as i32;
let sig = args[1] as c_int;
// debug!("KILL SYSCALL RECEIVED");
Self::kill(pid, sig)
}
SYS_RT_SIGACTION => {
let sig = args[0] as c_int;
let act = args[1];
let old_act = args[2];
Self::sigaction(sig, act, old_act, frame.is_from_user())
}
SYS_GETPID => Self::getpid().map(|pid| pid.into()),
SYS_SCHED => {
@ -794,14 +757,6 @@ impl Syscall {
Self::setpgid(pid, pgid)
}
SYS_RT_SIGPROCMASK => {
let how = args[0] as i32;
let nset = args[1];
let oset = args[2];
let sigsetsize = args[3];
Self::rt_sigprocmask(how, nset, oset, sigsetsize)
}
SYS_TKILL => {
warn!("SYS_TKILL has not yet been implemented");
Ok(0)
@ -1053,33 +1008,6 @@ impl Syscall {
let second = args[0] as u32;
Self::alarm(second)
}
SYS_SHMGET => {
let key = ShmKey::new(args[0]);
let size = args[1];
let shmflg = ShmFlags::from_bits_truncate(args[2] as u32);
Self::shmget(key, size, shmflg)
}
SYS_SHMAT => {
let id = ShmId::new(args[0]);
let vaddr = VirtAddr::new(args[1]);
let shmflg = ShmFlags::from_bits_truncate(args[2] as u32);
Self::shmat(id, vaddr, shmflg)
}
SYS_SHMDT => {
let vaddr = VirtAddr::new(args[0]);
Self::shmdt(vaddr)
}
SYS_SHMCTL => {
let id = ShmId::new(args[0]);
let cmd = ShmCtlCmd::from(args[1]);
let user_buf = args[2] as *const u8;
let from_user = frame.is_from_user();
Self::shmctl(id, cmd, user_buf, from_user)
}
SYS_MSYNC => {
let start = page_align_up(args[0]);
let len = page_align_up(args[1]);
@ -1131,8 +1059,7 @@ impl Syscall {
}
#[cfg(any(target_arch = "x86_64", target_arch = "riscv64"))]
SYS_SETRLIMIT => Ok(0),
SYS_RESTART_SYSCALL => Self::restart_syscall(),
SYS_RT_SIGPENDING => Self::rt_sigpending(args[0], args[1]),
SYS_RT_SIGTIMEDWAIT => {
log::warn!("SYS_RT_SIGTIMEDWAIT has not yet been implemented");
Ok(0)