Make MemoryMaps non-exhaustive and add MMapExtension::is_empty.

src/process/mod.rs

@@ -560,6 +560,7 @@ impl MMapPath {
 /// Represents all entries in a `/proc/<pid>/maps` or `/proc/<pid>/smaps` file.
 #[derive(Debug, PartialEq, Eq, Clone)]
 #[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
+#[non_exhaustive]
 pub struct MemoryMaps {
     pub memory_maps: Vec<MemoryMap>,
 }
@@ -733,6 +734,13 @@ pub struct MMapExtension {
     pub vm_flags: VmFlags,
 }
 
+impl MMapExtension {
+    /// Return whether the extension information is empty.
+    pub fn is_empty(&self) -> bool {
+        self.map.is_empty() && self.vm_flags == VmFlags::NONE
+    }
+}
+
 impl Io {
     pub fn from_reader<R: io::Read>(r: R) -> ProcResult<Io> {
         let mut map = HashMap::new();

src/process/stat.rs

@@ -3,7 +3,7 @@ use super::StatFlags;
 #[cfg(feature = "chrono")]
 use crate::TICKS_PER_SECOND;
 use crate::{from_iter, KernelVersion, ProcResult};
-use crate::{ProcError, KERNEL, PAGESIZE};
+use crate::{KERNEL, PAGESIZE};
 #[cfg(feature = "serde1")]
 use serde::{Deserialize, Serialize};