Exported from_subsystem_sysname()

src/device.rs

@@ -1,6 +1,6 @@
 use std::str;
 
-use std::ffi::{CStr, OsStr};
+use std::ffi::{CStr, CString, OsStr};
 use std::io::Result;
 use std::marker::PhantomData;
 use std::path::Path;
@@ -112,6 +112,61 @@ impl Device {
         Ok(Self::from_raw(udev, ptr))
     }
 
+    /// Create new udev device, and fill in information from the sys device
+    /// and the udev database entry.
+    ///
+    /// The device is looked up by the `subsystem` and `sysname` string of the device, like "mem" / "zero", or "block" / "sda".
+    pub fn from_subsystem_sysname(subsystem: String, sysname: String) -> Result<Self> {
+        let subsystem = CString::new(subsystem.as_bytes())
+            .ok()
+            .ok_or(std::io::Error::from_raw_os_error(libc::EINVAL))?;
+
+        let sysname = CString::new(sysname.as_bytes())
+            .ok()
+            .ok_or(std::io::Error::from_raw_os_error(libc::EINVAL))?;
+
+        let udev = Udev::new()?;
+
+        let ptr = try_alloc!(unsafe {
+            ffi::udev_device_new_from_subsystem_sysname(
+                udev.as_raw(),
+                subsystem.as_ptr(),
+                sysname.as_ptr(),
+            )
+        });
+
+        Ok(Self::from_raw(udev, ptr))
+    }
+
+    /// Create new udev device, and fill in information from the sys device
+    /// and the udev database entry, using an existing `Udev` instance rather than
+    /// creating a new one.
+    ///
+    /// The device is looked up by the `subsystem` and `sysname` string of the device, like "mem" / "zero", or "block" / "sda".
+    pub fn from_subsystem_sysname_with_context(
+        udev: Udev,
+        subsystem: String,
+        sysname: String,
+    ) -> Result<Self> {
+        let subsystem = CString::new(subsystem.as_bytes())
+            .ok()
+            .ok_or(std::io::Error::from_raw_os_error(libc::EINVAL))?;
+
+        let sysname = CString::new(sysname.as_bytes())
+            .ok()
+            .ok_or(std::io::Error::from_raw_os_error(libc::EINVAL))?;
+
+        let ptr = try_alloc!(unsafe {
+            ffi::udev_device_new_from_subsystem_sysname(
+                udev.as_raw(),
+                subsystem.as_ptr(),
+                sysname.as_ptr(),
+            )
+        });
+
+        Ok(Self::from_raw(udev, ptr))
+    }
+
     /// Creates a rust udev `Device` for a given UNIX device "special file" type and number.
     ///
     /// The `dev_type` parameter indicates which of the historical UNIX file-like I/O paradigms the