1 use core::{ 2 ffi::{c_int, c_void}, 3 sync::atomic::compiler_fence, 4 }; 5 6 use system_error::SystemError; 7 8 use crate::{ 9 arch::ipc::signal::{SigCode, SigFlags, SigSet, Signal}, 10 filesystem::vfs::{ 11 file::{File, FileMode}, 12 FilePrivateData, 13 }, 14 kerror, kwarn, 15 mm::VirtAddr, 16 process::{Pid, ProcessManager}, 17 syscall::{user_access::UserBufferWriter, Syscall}, 18 }; 19 20 use super::{ 21 pipe::{LockedPipeInode, PipeFsPrivateData}, 22 signal_types::{ 23 SaHandlerType, SigInfo, SigType, Sigaction, SigactionType, UserSigaction, USER_SIG_DFL, 24 USER_SIG_ERR, USER_SIG_IGN, 25 }, 26 }; 27 28 impl Syscall { 29 /// # 创建带参数的匿名管道 30 /// 31 /// ## 参数 32 /// 33 /// - `fd`: 用于返回文件描述符的数组 34 /// - `flags`:设置管道的参数 35 pub fn pipe2(fd: *mut i32, flags: FileMode) -> Result<usize, SystemError> { 36 if !flags 37 .difference(FileMode::O_CLOEXEC | FileMode::O_NONBLOCK | FileMode::O_DIRECT) 38 .is_empty() 39 { 40 return Err(SystemError::EINVAL); 41 } 42 43 let mut user_buffer = UserBufferWriter::new(fd, core::mem::size_of::<[c_int; 2]>(), true)?; 44 let fd = user_buffer.buffer::<i32>(0)?; 45 let pipe_ptr = LockedPipeInode::new(); 46 47 let mut read_file = File::new( 48 pipe_ptr.clone(), 49 FileMode::O_RDONLY | (flags & FileMode::O_NONBLOCK), 50 )?; 51 read_file.private_data = 52 FilePrivateData::Pipefs(PipeFsPrivateData::new(FileMode::O_RDONLY)); 53 54 let mut write_file = File::new( 55 pipe_ptr.clone(), 56 FileMode::O_WRONLY | (flags & (FileMode::O_NONBLOCK | FileMode::O_DIRECT)), 57 )?; 58 write_file.private_data = FilePrivateData::Pipefs(PipeFsPrivateData::new( 59 FileMode::O_WRONLY | (flags & (FileMode::O_NONBLOCK | FileMode::O_DIRECT)), 60 )); 61 62 if flags.contains(FileMode::O_CLOEXEC) { 63 read_file.set_close_on_exec(true); 64 write_file.set_close_on_exec(true); 65 } 66 let fd_table_ptr = ProcessManager::current_pcb().fd_table(); 67 let mut fd_table_guard = fd_table_ptr.write(); 68 let read_fd = fd_table_guard.alloc_fd(read_file, None)?; 69 let write_fd = fd_table_guard.alloc_fd(write_file, None)?; 70 71 drop(fd_table_guard); 72 73 fd[0] = read_fd; 74 fd[1] = write_fd; 75 Ok(0) 76 } 77 78 pub fn kill(pid: Pid, sig: c_int) -> Result<usize, SystemError> { 79 let sig = Signal::from(sig); 80 if sig == Signal::INVALID { 81 // 传入的signal数值不合法 82 kwarn!("Not a valid signal number"); 83 return Err(SystemError::EINVAL); 84 } 85 86 // 初始化signal info 87 let mut info = SigInfo::new(sig, 0, SigCode::User, SigType::Kill(pid)); 88 89 compiler_fence(core::sync::atomic::Ordering::SeqCst); 90 91 let retval = sig 92 .send_signal_info(Some(&mut info), pid) 93 .map(|x| x as usize); 94 95 compiler_fence(core::sync::atomic::Ordering::SeqCst); 96 97 return retval; 98 } 99 100 /// 通用信号注册函数 101 /// 102 /// ## 参数 103 /// 104 /// - `sig` 信号的值 105 /// - `act` 用户空间传入的 Sigaction 指针 106 /// - `old_act` 用户空间传入的用来保存旧 Sigaction 的指针 107 /// - `from_user` 用来标识这个函数调用是否来自用户空间 108 /// 109 /// @return int 错误码 110 #[no_mangle] 111 pub fn sigaction( 112 sig: c_int, 113 new_act: usize, 114 old_act: usize, 115 from_user: bool, 116 ) -> Result<usize, SystemError> { 117 // 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 118 let act: *mut UserSigaction = new_act as *mut UserSigaction; 119 let old_act = old_act as *mut UserSigaction; 120 let mut new_ka: Sigaction = Default::default(); 121 let mut old_sigaction: Sigaction = Default::default(); 122 // 如果传入的，新的sigaction不为空 123 if !act.is_null() { 124 // 如果参数的范围不在用户空间，则返回错误 125 let r = UserBufferWriter::new(act, core::mem::size_of::<Sigaction>(), from_user); 126 if r.is_err() { 127 return Err(SystemError::EFAULT); 128 } 129 let mask: SigSet = unsafe { (*act).mask }; 130 let input_sighandler = unsafe { (*act).handler as u64 }; 131 match input_sighandler { 132 USER_SIG_DFL => { 133 new_ka = Sigaction::DEFAULT_SIGACTION; 134 *new_ka.flags_mut() = unsafe { (*act).flags }; 135 new_ka.set_restorer(None); 136 } 137 138 USER_SIG_IGN => { 139 new_ka = Sigaction::DEFAULT_SIGACTION_IGNORE; 140 *new_ka.flags_mut() = unsafe { (*act).flags }; 141 142 new_ka.set_restorer(None); 143 } 144 _ => { 145 // 从用户空间获得sigaction结构体 146 // TODO mask是default还是用户空间传入 147 new_ka = Sigaction::new( 148 SigactionType::SaHandler(SaHandlerType::Customized(unsafe { 149 VirtAddr::new((*act).handler as usize) 150 })), 151 unsafe { (*act).flags }, 152 SigSet::default(), 153 unsafe { Some(VirtAddr::new((*act).restorer as usize)) }, 154 ); 155 } 156 } 157 158 // TODO 如果为空，赋默认值？ 159 // kdebug!("new_ka={:?}", new_ka); 160 // 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） 161 if new_ka.restorer().is_some() { 162 new_ka.flags_mut().insert(SigFlags::SA_RESTORER); 163 } else if new_ka.action().is_customized() { 164 kerror!( 165 "pid:{:?}: in sys_sigaction: User must manually sprcify a sa_restorer for signal {}.", 166 ProcessManager::current_pcb().pid(), 167 sig 168 ); 169 return Err(SystemError::EINVAL); 170 } 171 *new_ka.mask_mut() = mask; 172 } 173 174 let sig = Signal::from(sig); 175 // 如果给出的信号值不合法 176 if sig == Signal::INVALID { 177 return Err(SystemError::EINVAL); 178 } 179 180 let retval = super::signal::do_sigaction( 181 sig, 182 if act.is_null() { 183 None 184 } else { 185 Some(&mut new_ka) 186 }, 187 if old_act.is_null() { 188 None 189 } else { 190 Some(&mut old_sigaction) 191 }, 192 ); 193 194 // 195 if (retval == Ok(())) && (!old_act.is_null()) { 196 let r = 197 UserBufferWriter::new(old_act, core::mem::size_of::<UserSigaction>(), from_user); 198 if r.is_err() { 199 return Err(SystemError::EFAULT); 200 } 201 202 let sigaction_handler = match old_sigaction.action() { 203 SigactionType::SaHandler(handler) => { 204 if let SaHandlerType::Customized(hand) = handler { 205 hand 206 } else if handler.is_sig_ignore() { 207 VirtAddr::new(USER_SIG_IGN as usize) 208 } else if handler.is_sig_error() { 209 VirtAddr::new(USER_SIG_ERR as usize) 210 } else { 211 VirtAddr::new(USER_SIG_DFL as usize) 212 } 213 } 214 SigactionType::SaSigaction(_) => { 215 kerror!("unsupported type: SaSigaction"); 216 VirtAddr::new(USER_SIG_DFL as usize) 217 } 218 }; 219 220 unsafe { 221 (*old_act).handler = sigaction_handler.data() as *mut c_void; 222 (*old_act).flags = old_sigaction.flags(); 223 (*old_act).mask = old_sigaction.mask(); 224 if old_sigaction.restorer().is_some() { 225 (*old_act).restorer = old_sigaction.restorer().unwrap().data() as *mut c_void; 226 } 227 } 228 } 229 return retval.map(|_| 0); 230 } 231 } 232