diff --git a/src/fe/mod.rs b/src/fe/mod.rs
index 4bee543..92e3b53 100644
--- a/src/fe/mod.rs
+++ b/src/fe/mod.rs
@@ -33,7 +33,6 @@ use {
         Context,
         Result,
     },
-    libc,
     thiserror::Error,
 
     crate::ioctl::{
@@ -201,8 +200,8 @@ impl FeDevice {
         let mut feinfo = FeInfo::default();
         self.ioctl(FE_GET_INFO, feinfo.as_mut_ptr()).context("fe get info")?;
 
-        let len = unsafe { libc::strnlen(feinfo.name.as_ptr() as *const _, feinfo.name.len()) };
-        if let Ok(name) = CStr::from_bytes_with_nul(&feinfo.name[.. len + 1]) {
+        if let Some(len) = feinfo.name.iter().position(|&b| b == 0) {
+            let name = unsafe { CStr::from_ptr(feinfo.name[.. len + 1].as_ptr()) };
             if let Ok(name) = name.to_str() {
                 self.name = name.to_owned();
             }
@@ -370,25 +369,23 @@ impl FeDevice {
     pub fn ioctl_set_property(&self, cmdseq: &[DtvProperty]) -> Result<()> {
         self.check_cmdseq(cmdseq).context("fe property check")?;
 
-        let cmd = DtvProperties::new(cmdseq);
+        let cmd = DtvProperties {
+            num: cmdseq.len() as u32,
+            props: cmdseq.as_ptr(),
+        };
+
         self.ioctl(FE_SET_PROPERTY, cmd.as_ptr())
     }
 
     /// Gets properties from frontend device
     pub fn ioctl_get_property(&self, cmdseq: &mut [DtvProperty]) -> Result<()> {
-        // same as DtvProperties but with mut props
-        #[repr(C)]
-        struct DtvPropertiesMut {
-            num: u32,
-            props: *mut DtvProperty,
-        }
 
         let mut cmd = DtvPropertiesMut {
             num: cmdseq.len() as u32,
             props: cmdseq.as_mut_ptr(),
         };
 
-        self.ioctl(FE_GET_PROPERTY, &mut cmd as *mut _)
+        self.ioctl(FE_GET_PROPERTY, cmd.as_mut_ptr())
     }
 
     /// Sets DiSEqC master command
diff --git a/src/fe/sys.rs b/src/fe/sys.rs
index 3256fd9..5feab62 100644
--- a/src/fe/sys.rs
+++ b/src/fe/sys.rs
@@ -118,7 +118,7 @@ mod fe_type {
 #[derive(Debug)]
 pub struct FeInfo {
     /// Name of the frontend
-    pub name: [u8; 128],
+    pub name: [std::os::raw::c_char; 128],
     /// DEPRECATED: frontend delivery system
     pub fe_type: u32,
     /// Minimal frequency supported by the frontend
@@ -710,7 +710,6 @@ pub const DTV_IOCTL_MAX_MSGS: usize                     = 64;
 
 /// a set of command/value pairs for FE_SET_PROPERTY
 #[repr(C)]
-#[derive(Debug)]
 pub struct DtvProperties {
     pub num: u32,
     pub props: *const DtvProperty,
@@ -718,19 +717,26 @@ pub struct DtvProperties {
 
 
 impl DtvProperties {
-    #[inline]
-    pub fn new(props: &[DtvProperty]) -> DtvProperties {
-        DtvProperties {
-            num: props.len() as u32,
-            props: props.as_ptr(),
-        }
-    }
-
     #[inline]
     pub fn as_ptr(&self) -> *const DtvProperties { self as *const _ }
 }
 
 
+// a set of command/value pairs for FE_GET_PROPERTY
+#[repr(C)]
+#[derive(Debug)]
+pub struct DtvPropertiesMut {
+    pub num: u32,
+    pub props: *mut DtvProperty,
+}
+
+
+impl DtvPropertiesMut {
+    #[inline]
+    pub fn as_mut_ptr(&mut self) -> *mut DtvPropertiesMut { self as *mut _ }
+}
+
+
 #[repr(C)]
 #[derive(Debug)]
 pub struct FeParameters {
@@ -770,7 +776,7 @@ pub const FE_GET_INFO: IoctlInt = io_read::<FeInfo>(b'o', 61);
 
 pub const FE_DISEQC_RESET_OVERLOAD: IoctlInt = io_none(b'o', 62);
 pub const FE_DISEQC_SEND_MASTER_CMD: IoctlInt = io_write::<DiseqcMasterCmd>(b'o', 63);
-pub const FE_DISEQC_RECV_SLAVE_REPLY: IoctlInt = io_read::<DiseqcSlaveReply>(b'0', 64);
+pub const FE_DISEQC_RECV_SLAVE_REPLY: IoctlInt = io_read::<DiseqcSlaveReply>(b'o', 64);
 pub const FE_DISEQC_SEND_BURST: IoctlInt = io_none(b'o', 65);
 
 pub const FE_SET_TONE: IoctlInt = io_none(b'o', 66);
@@ -787,4 +793,4 @@ pub const FE_GET_EVENT: IoctlInt = io_read::<FeEvent>(b'o', 78);
 pub const FE_SET_FRONTEND_TUNE_MODE: IoctlInt = io_none(b'o', 81);
 
 pub const FE_SET_PROPERTY: IoctlInt = io_write::<DtvProperties>(b'o', 82);
-pub const FE_GET_PROPERTY: IoctlInt = io_read::<DtvProperties>(b'o', 83);
+pub const FE_GET_PROPERTY: IoctlInt = io_read::<DtvPropertiesMut>(b'o', 83);