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Initialize shm_open implementation (#651)
Co-authored-by: Marcin Mikołajczyk <[email protected]> Co-authored-by: Putta Khunchalee <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| use crate::{ | ||
| errno::{Errno, EINVAL}, | ||
| fs::{ | ||
| check_access, Access, DefaultError, FileBackend, IoCmd, Mode, OpenFlags, Stat, Uio, UioMut, | ||
| VFile, VFileFlags, VPathBuf, | ||
| }, | ||
| memory::MemoryManager, | ||
| process::VThread, | ||
| syscalls::{SysErr, SysIn, SysOut, Syscalls}, | ||
| ucred::{Gid, Ucred, Uid}, | ||
| }; | ||
| use std::{convert::Infallible, sync::Arc}; | ||
|
|
||
| pub struct SharedMemoryManager { | ||
| mm: Arc<MemoryManager>, | ||
| } | ||
|
|
||
| impl SharedMemoryManager { | ||
| pub fn new(mm: &Arc<MemoryManager>, sys: &mut Syscalls) -> Arc<Self> { | ||
| let shm = Arc::new(Self { mm: mm.clone() }); | ||
|
|
||
| sys.register(482, &shm, Self::sys_shm_open); | ||
| sys.register(483, &shm, Self::sys_shm_unlink); | ||
|
|
||
| shm | ||
| } | ||
|
|
||
| fn sys_shm_open(self: &Arc<Self>, i: &SysIn) -> Result<SysOut, SysErr> { | ||
| let path = unsafe { i.args[0].to_shm_path() }?.expect("invalid shm path"); | ||
| let flags: OpenFlags = i.args[1].try_into().unwrap(); | ||
| let mode: u32 = i.args[2].try_into().unwrap(); | ||
|
|
||
| if (flags & OpenFlags::O_ACCMODE != OpenFlags::O_RDONLY) | ||
| || (flags & OpenFlags::O_ACCMODE != OpenFlags::O_RDWR) | ||
| { | ||
| return Err(SysErr::Raw(EINVAL)); | ||
| } | ||
|
|
||
| if !flags | ||
| .difference( | ||
| OpenFlags::O_ACCMODE | OpenFlags::O_CREAT | OpenFlags::O_EXCL | OpenFlags::O_TRUNC, | ||
| ) | ||
| .is_empty() | ||
| { | ||
| return Err(SysErr::Raw(EINVAL)); | ||
| } | ||
|
|
||
| let td = VThread::current().unwrap(); | ||
|
|
||
| let filedesc = td.proc().files(); | ||
|
|
||
| let mode = mode & filedesc.cmask() & 0o7777; | ||
|
|
||
| let fd = filedesc.alloc_without_budget::<Infallible>( | ||
| |_| match path { | ||
| ShmPath::Anon => { | ||
| todo!() | ||
| } | ||
| ShmPath::Path(path) => { | ||
| todo!() | ||
| } | ||
| }, | ||
| (flags & OpenFlags::O_ACCMODE).into_fflags(), | ||
| )?; | ||
|
|
||
| Ok(fd.into()) | ||
| } | ||
|
|
||
| fn sys_shm_unlink(self: &Arc<Self>, i: &SysIn) -> Result<SysOut, SysErr> { | ||
| todo!("sys_shm_unlink") | ||
| } | ||
| } | ||
|
|
||
| pub enum ShmPath { | ||
| Anon, | ||
| Path(VPathBuf), | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| pub struct Shm { | ||
| uid: Uid, | ||
| gid: Gid, | ||
| mode: Mode, | ||
| } | ||
|
|
||
| impl Shm { | ||
| /// See `shm_do_truncate` on the PS4 for a reference. | ||
| fn truncate(&self, size: usize) { | ||
| todo!() | ||
| } | ||
|
|
||
| /// See `shm_access` on the PS4 for a reference. | ||
| fn access(&self, cred: &Ucred, flags: VFileFlags) -> Result<(), Box<dyn Errno>> { | ||
| let mut access = Access::empty(); | ||
|
|
||
| if flags.intersects(VFileFlags::READ) { | ||
| access |= Access::READ; | ||
| } | ||
|
|
||
| if flags.intersects(VFileFlags::WRITE) { | ||
| access |= Access::WRITE; | ||
| } | ||
|
|
||
| check_access(cred, self.uid, self.gid, self.mode, access, false)?; | ||
|
|
||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| impl FileBackend for Shm { | ||
| #[allow(unused_variables)] | ||
| fn read( | ||
| self: &Arc<Self>, | ||
| file: &VFile, | ||
| buf: &mut UioMut, | ||
| td: Option<&VThread>, | ||
| ) -> Result<usize, Box<dyn Errno>> { | ||
| Err(DefaultError::OperationNotSupported.into()) | ||
| } | ||
|
|
||
| #[allow(unused_variables)] | ||
| fn write( | ||
| self: &Arc<Self>, | ||
| file: &VFile, | ||
| buf: &mut Uio, | ||
| td: Option<&VThread>, | ||
| ) -> Result<usize, Box<dyn Errno>> { | ||
| Err(DefaultError::OperationNotSupported.into()) | ||
| } | ||
|
|
||
| #[allow(unused_variables)] // remove when implementing | ||
| fn ioctl( | ||
| self: &Arc<Self>, | ||
| file: &VFile, | ||
| cmd: IoCmd, | ||
| td: Option<&VThread>, | ||
| ) -> Result<(), Box<dyn Errno>> { | ||
| todo!() | ||
| } | ||
|
|
||
| #[allow(unused_variables)] // remove when implementing | ||
| fn stat(self: &Arc<Self>, file: &VFile, td: Option<&VThread>) -> Result<Stat, Box<dyn Errno>> { | ||
| let mut stat = Stat::zeroed(); | ||
|
|
||
| stat.block_size = 0x4000; | ||
|
|
||
| todo!() | ||
| } | ||
| } |
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