Move all wayland files into wayland namespace

src/wayland/shm.rs

@@ -0,0 +1,71 @@
+use libc::{c_void, ftruncate, mmap, munmap, shm_open, shm_unlink, MAP_FAILED, MAP_SHARED, O_CREAT, O_EXCL, O_RDWR, PROT_READ, PROT_WRITE};
+
+#[derive(Clone)]
+pub struct ShmPool {
+    pub fd: i32,
+    pub id: u32,
+    pub addr: *mut c_void,
+    pub size: usize,
+}
+
+impl ShmPool {
+    pub fn new(size: usize, id: u32) -> std::io::Result<ShmPool> {
+        let shm_path: *const i8 = b"/chlorostart\0".as_ptr() as *const i8;
+        let fd = unsafe { shm_open(shm_path, O_RDWR | O_EXCL | O_CREAT, 0o600) };
+        if fd == -1 {
+            eprint!("shm_open in ShmPool::new() failed: ");
+            return Err(std::io::Error::last_os_error())
+        }
+        if unsafe { shm_unlink(shm_path) } == -1 {
+            eprint!("shm_unlink in ShmPool::new() failed: ");
+            return Err(std::io::Error::last_os_error())
+        }
+        if unsafe { ftruncate(fd, size as i64) } == -1 {
+            eprint!("ftruncate in ShmPool::new() failed: ");
+            return Err(std::io::Error::last_os_error())
+        }
+        let addr = unsafe {
+            mmap(std::ptr::null_mut(), size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)
+        };
+
+        if addr == MAP_FAILED {
+            eprint!("mmap in ShmPool::new() failed: ");
+            return Err(std::io::Error::last_os_error())
+        }
+
+        Ok(ShmPool {
+            fd,
+            id,
+            addr,
+            size 
+        })
+    }
+
+    pub fn resize(&mut self, size: usize) -> std::io::Result<()> {
+        if unsafe { ftruncate(self.fd, size as i64) } == -1 {
+            return Err(std::io::Error::last_os_error())
+        };
+        self.size = size;
+
+        Ok(())
+    }
+
+    pub fn write(&mut self, data: &Vec<u32>, offset: isize) -> std::io::Result<()> {
+        // TODO: Bounds check
+        unsafe {
+            std::ptr::copy_nonoverlapping(
+                data.as_ptr() as *const u32, // src: data as *const u32
+                self.addr.offset(offset*4) as *mut u32, // dst: ShmPool address as *mut u32
+                data.len()
+            );
+        }
+
+        Ok(())
+    }
+}
+
+impl Drop for ShmPool {
+    fn drop(&mut self) {
+        unsafe { munmap(self.addr, self.size); }
+    }
+}