refactor: redo how we do get processes between different OSes (#1197)

* refactor: redo how we do some processes between different OSes

* cleanup

* more cleanup

* windows

* freebsd

* clean up linux more, fix broken FreeBSD import

* some more cleanup to remove some big imports

11 files changed, 370 insertions, 337 deletions

diff --git a/src/app/data_farmer.rs b/src/app/data_farmer.rs
index c11595bc..d1db6070 100644
--- a/src/app/data_farmer.rs
+++ b/src/app/data_farmer.rs
@@ -204,7 +204,7 @@ impl DataCollection {
     }
 
     pub fn eat_data(&mut self, harvested_data: Box<Data>) {
-        let harvested_time = harvested_data.last_collection_time;
+        let harvested_time = harvested_data.collection_time;
         let mut new_entry = TimedData::default();
 
         // Network
diff --git a/src/app/data_harvester.rs b/src/app/data_harvester.rs
index 2f4633bf..0ea6e3e9 100644
--- a/src/app/data_harvester.rs
+++ b/src/app/data_harvester.rs
@@ -27,7 +27,7 @@ pub mod temperature;
 
 #[derive(Clone, Debug)]
 pub struct Data {
-    pub last_collection_time: Instant,
+    pub collection_time: Instant,
     pub cpu: Option<cpu::CpuHarvest>,
     pub load_avg: Option<cpu::LoadAvgHarvest>,
     pub memory: Option<memory::MemHarvest>,
@@ -50,7 +50,7 @@ pub struct Data {
 impl Default for Data {
     fn default() -> Self {
         Data {
-            last_collection_time: Instant::now(),
+            collection_time: Instant::now(),
             cpu: None,
             load_avg: None,
             memory: None,
@@ -284,24 +284,20 @@ impl DataCollector {
     pub fn update_data(&mut self) {
         self.refresh_sysinfo_data();
 
-        let current_instant = Instant::now();
+        self.data.collection_time = Instant::now();
 
         self.update_cpu_usage();
         self.update_memory_usage();
-        self.update_processes(
-            #[cfg(target_os = "linux")]
-            current_instant,
-        );
+        self.update_processes();
         self.update_temps();
-        self.update_network_usage(current_instant);
+        self.update_network_usage();
         self.update_disks();
 
         #[cfg(feature = "battery")]
         self.update_batteries();
 
         // Update times for future reference.
-        self.last_collection_time = current_instant;
-        self.data.last_collection_time = current_instant;
+        self.last_collection_time = self.data.collection_time;
     }
 
     #[inline]
@@ -317,66 +313,9 @@ impl DataCollector {
     }
 
     #[inline]
-    fn update_processes(&mut self, #[cfg(target_os = "linux")] current_instant: Instant) {
+    fn update_processes(&mut self) {
         if self.widgets_to_harvest.use_proc {
-            if let Ok(mut process_list) = {
-                let total_memory = if let Some(memory) = &self.data.memory {
-                    memory.total_bytes
-                } else {
-                    self.sys.total_memory()
-                };
-
-                #[cfg(target_os = "linux")]
-                {
-                    use self::processes::{PrevProc, ProcHarvestOptions};
-
-                    let prev_proc = PrevProc {
-                        prev_idle: &mut self.prev_idle,
-                        prev_non_idle: &mut self.prev_non_idle,
-                    };
-
-                    let proc_harvest_options = ProcHarvestOptions {
-                        use_current_cpu_total: self.use_current_cpu_total,
-                        unnormalized_cpu: self.unnormalized_cpu,
-                    };
-
-                    let time_diff = current_instant
-                        .duration_since(self.last_collection_time)
-                        .as_secs();
-
-                    processes::get_process_data(
-                        &self.sys,
-                        prev_proc,
-                        &mut self.pid_mapping,
-                        proc_harvest_options,
-                        time_diff,
-                        total_memory,
-                        &mut self.user_table,
-                    )
-                }
-                #[cfg(not(target_os = "linux"))]
-                {
-                    #[cfg(target_family = "unix")]
-                    {
-                        processes::get_process_data(
-                            &self.sys,
-                            self.use_current_cpu_total,
-                            self.unnormalized_cpu,
-                            total_memory,
-                            &mut self.user_table,
-                        )
-                    }
-                    #[cfg(not(target_family = "unix"))]
-                    {
-                        processes::get_process_data(
-                            &self.sys,
-                            self.use_current_cpu_total,
-                            self.unnormalized_cpu,
-                            total_memory,
-                        )
-                    }
-                }
-            } {
+            if let Ok(mut process_list) = self.get_processes() {
                 // NB: To avoid duplicate sorts on rerenders/events, we sort the processes by PID here.
                 // We also want to avoid re-sorting *again* later on if we're sorting by PID, since we already
                 // did it here!
@@ -435,7 +374,9 @@ impl DataCollector {
     }
 
     #[inline]
-    fn update_network_usage(&mut self, current_instant: Instant) {
+    fn update_network_usage(&mut self) {
+        let current_instant = self.data.collection_time;
+
         if self.widgets_to_harvest.use_net {
             let net_data = network::get_network_data(
                 &self.sys,
@@ -485,6 +426,16 @@ impl DataCollector {
             self.data.io = disks::get_io_usage().ok();
         }
     }
+
+    /// Returns the total memory of the system.
+    #[inline]
+    fn total_memory(&self) -> u64 {
+        if let Some(memory) = &self.data.memory {
+            memory.total_bytes
+        } else {
+            self.sys.total_memory()
+        }
+    }
 }
 
 /// We set a sleep duration between 10ms and 250ms, ideally sysinfo's [`System::MINIMUM_CPU_UPDATE_INTERVAL`] + 1.
diff --git a/src/app/data_harvester/processes.rs b/src/app/data_harvester/processes.rs
index 0f082e00..44f132d9 100644
--- a/src/app/data_harvester/processes.rs
+++ b/src/app/data_harvester/processes.rs
@@ -1,37 +1,41 @@
 //! Data collection for processes.
 //!
 //! For Linux, this is handled by a custom set of functions.
-//! For Windows and macOS, this is handled by sysinfo.
+//! For Windows, macOS, FreeBSD, Android, and Linux, this is handled by sysinfo.
 
-cfg_if::cfg_if! {
+use cfg_if::cfg_if;
+use std::{borrow::Cow, time::Duration};
+
+use super::DataCollector;
+
+use crate::{utils::error, Pid};
+
+cfg_if! {
     if #[cfg(target_os = "linux")] {
         pub mod linux;
         pub use self::linux::*;
     } else if #[cfg(target_os = "macos")] {
         pub mod macos;
-        mod macos_freebsd;
-        pub use self::macos::*;
+        pub(crate) use self::macos::*;
     } else if #[cfg(target_os = "windows")] {
         pub mod windows;
         pub use self::windows::*;
     } else if #[cfg(target_os = "freebsd")] {
         pub mod freebsd;
-        mod macos_freebsd;
-        pub use self::freebsd::*;
+        pub(crate) use self::freebsd::*;
+    } else if #[cfg(target_family = "unix")] {
+        pub(crate) struct GenericProcessExt;
+        impl UnixProcessExt for GenericProcessExt {}
     }
 }
 
-cfg_if::cfg_if! {
+cfg_if! {
     if #[cfg(target_family = "unix")] {
         pub mod unix;
         pub use self::unix::*;
     }
 }
 
-use std::{borrow::Cow, time::Duration};
-
-use crate::Pid;
-
 #[derive(Debug, Clone, Default)]
 pub struct ProcessHarvest {
     /// The pid of the process.
@@ -96,3 +100,24 @@ impl ProcessHarvest {
         self.time += rhs.time;
     }
 }
+
+impl DataCollector {
+    pub(crate) fn get_processes(&mut self) -> error::Result<Vec<ProcessHarvest>> {
+        cfg_if! {
+            if #[cfg(target_os = "linux")] {
+                let time_diff = self.data.collection_time
+                    .duration_since(self.last_collection_time)
+                    .as_secs();
+
+                linux_process_data(
+                    self,
+                    time_diff,
+                )
+            } else if #[cfg(any(target_os = "freebsd", target_os = "macos", target_os = "windows", target_os = "android", target_os = "ios"))] {
+                sysinfo_process_data(self)
+            } else {
+                Err(error::BottomError::GenericError("Unsupported OS".to_string()))
+            }
+        }
+    }
+}
diff --git a/src/app/data_harvester/processes/freebsd.rs b/src/app/data_harvester/processes/freebsd.rs
index 43c373e0..0d92d873 100644
--- a/src/app/data_harvester/processes/freebsd.rs
+++ b/src/app/data_harvester/processes/freebsd.rs
@@ -1,14 +1,13 @@
 //! Process data collection for FreeBSD.  Uses sysinfo.
 
 use std::io;
+use std::process::Command;
 
 use hashbrown::HashMap;
 use serde::{Deserialize, Deserializer};
-use sysinfo::System;
 
-use super::ProcessHarvest;
-use crate::data_harvester::deserialize_xo;
-use crate::data_harvester::processes::UserTable;
+use crate::data_harvester::{deserialize_xo, processes::UnixProcessExt};
+use crate::Pid;
 
 #[derive(Deserialize, Debug, Default)]
 #[serde(rename_all = "kebab-case")]
@@ -25,36 +24,34 @@ struct ProcessRow {
     percent_cpu: f64,
 }
 
-pub fn get_process_data(
-    sys: &System, use_current_cpu_total: bool, unnormalized_cpu: bool, total_memory: u64,
-    user_table: &mut UserTable,
-) -> crate::utils::error::Result<Vec<ProcessHarvest>> {
-    super::macos_freebsd::get_process_data(
-        sys,
-        use_current_cpu_total,
-        unnormalized_cpu,
-        total_memory,
-        user_table,
-        get_freebsd_process_cpu_usage,
-    )
-}
+pub(crate) struct FreeBSDProcessExt;
 
-fn get_freebsd_process_cpu_usage(pids: &[i32]) -> io::Result<HashMap<i32, f64>> {
-    if pids.is_empty() {
-        return Ok(HashMap::new());
+impl UnixProcessExt for FreeBSDProcessExt {
+    #[inline]
+    fn has_backup_proc_cpu_fn() -> bool {
+        true
     }
 
-    let output = std::process::Command::new("ps")
-        .args(["--libxo", "json", "-o", "pid,pcpu", "-p"])
-        .args(pids.iter().map(i32::to_string))
-        .output()?;
-    deserialize_xo("process-information", &output.stdout).map(|process_info: ProcessInformation| {
-        process_info
-            .process
-            .into_iter()
-            .map(|row| (row.pid, row.percent_cpu))
-            .collect()
-    })
+    fn backup_proc_cpu(pids: &[Pid]) -> io::Result<HashMap<Pid, f64>> {
+        if pids.is_empty() {
+            return Ok(HashMap::new());
+        }
+
+        let output = Command::new("ps")
+            .args(["--libxo", "json", "-o", "pid,pcpu", "-p"])
+            .args(pids.iter().map(i32::to_string))
+            .output()?;
+
+        deserialize_xo("process-information", &output.stdout).map(
+            |process_info: ProcessInformation| {
+                process_info
+                    .process
+                    .into_iter()
+                    .map(|row| (row.pid, row.percent_cpu))
+                    .collect()
+            },
+        )
+    }
 }
 
 fn pid<'de, D>(deserializer: D) -> Result<i32, D::Error>
diff --git a/src/app/data_harvester/processes/linux.rs b/src/app/data_harvester/processes/linux.rs
index 1fd2ba79..37341865 100644
--- a/src/app/data_harvester/processes/linux.rs
+++ b/src/app/data_harvester/processes/linux.rs
@@ -7,10 +7,11 @@ use std::fs::{self, File};
 use std::io::{BufRead, BufReader};
 use std::time::Duration;
 
-use hashbrown::{HashMap, HashSet};
-use sysinfo::{ProcessStatus, System};
+use hashbrown::HashSet;
+use sysinfo::ProcessStatus;
 
 use super::{ProcessHarvest, UserTable};
+use crate::app::data_harvester::DataCollector;
 use crate::utils::error::{self, BottomError};
 use crate::Pid;
 
@@ -265,11 +266,21 @@ fn is_str_numeric(s: &str) -> bool {
     s.chars().all(|c| c.is_ascii_digit())
 }
 
-pub(crate) fn get_process_data(
-    sys: &System, prev_proc: PrevProc<'_>, pid_mapping: &mut HashMap<Pid, PrevProcDetails>,
-    proc_harvest_options: ProcHarvestOptions, time_difference_in_secs: u64, total_memory: u64,
-    user_table: &mut UserTable,
-) -> crate::utils::error::Result<Vec<ProcessHarvest>> {
+pub(crate) fn linux_process_data(
+    collector: &mut DataCollector, time_difference_in_secs: u64,
+) -> error::Result<Vec<ProcessHarvest>> {
+    let total_memory = collector.total_memory();
+    let prev_proc = PrevProc {
+        prev_idle: &mut collector.prev_idle,
+        prev_non_idle: &mut collector.prev_non_idle,
+    };
+    let proc_harvest_options = ProcHarvestOptions {
+        use_current_cpu_total: collector.use_current_cpu_total,
+        unnormalized_cpu: collector.unnormalized_cpu,
+    };
+    let pid_mapping = &mut collector.pid_mapping;
+    let user_table = &mut collector.user_table;
+
     let ProcHarvestOptions {
         use_current_cpu_total,
         unnormalized_cpu,
@@ -289,7 +300,7 @@ pub(crate) fn get_process_data(
     {
         if unnormalized_cpu {
             use sysinfo::SystemExt;
-            let num_processors = sys.cpus().len() as f64;
+            let num_processors = collector.sys.cpus().len() as f64;
 
             // Note we *divide* here because the later calculation divides `cpu_usage` - in effect,
             // multiplying over the number of cores.
diff --git a/src/app/data_harvester/processes/macos.rs b/src/app/data_harvester/processes/macos.rs
index 95e6fd9a..b895e1ec 100644
--- a/src/app/data_harvester/processes/macos.rs
+++ b/src/app/data_harvester/processes/macos.rs
@@ -1,57 +1,63 @@
 //! Process data collection for macOS.  Uses sysinfo and custom bindings.
 
+use std::io;
+use std::process::Command;
+
 use hashbrown::HashMap;
-use sysinfo::System;
+use itertools::Itertools;
+use sysinfo::{PidExt, ProcessExt};
+
+use super::UnixProcessExt;
 
-use super::ProcessHarvest;
-use crate::{data_harvester::processes::UserTable, Pid};
+use crate::Pid;
 mod sysctl_bindings;
 
-pub fn get_process_data(
-    sys: &System, use_current_cpu_total: bool, unnormalized_cpu: bool, mem_total: u64,
-    user_table: &mut UserTable,
-) -> crate::utils::error::Result<Vec<ProcessHarvest>> {
-    super::macos_freebsd::get_process_data(
-        sys,
-        use_current_cpu_total,
-        unnormalized_cpu,
-        mem_total,
-        user_table,
-        get_macos_process_cpu_usage,
-    )
+pub(crate) struct MacOSProcessExt;
+
+impl UnixProcessExt for MacOSProcessExt {
+    #[inline]
+    fn has_backup_proc_cpu_fn() -> bool {
+        true
+    }
+
+    fn backup_proc_cpu(pids: &[Pid]) -> io::Result<HashMap<Pid, f64>> {
+        let output = Command::new("ps")
+            .args(["-o", "pid=,pcpu=", "-p"])
+            .arg(
+                // Has to look like this since otherwise, it you hit a `unstable_name_collisions` warning.
+                Itertools::intersperse(pids.iter().map(i32::to_string), ",".to_string())
+                    .collect::<String>(),
+            )
+            .output()?;
+        let mut result = HashMap::new();
+        String::from_utf8_lossy(&output.stdout)
+            .split_whitespace()
+            .chunks(2)
+            .into_iter()
+            .for_each(|chunk| {
+                let chunk: Vec<&str> = chunk.collect();
+                if chunk.len() != 2 {
+                    panic!("Unexpected `ps` output");
+                }
+                let pid = chunk[0].parse();
+                let usage = chunk[1].parse();
+                if let (Ok(pid), Ok(usage)) = (pid, usage) {
+                    result.insert(pid, usage);
+                }
+            });
+        Ok(result)
+    }
+
+    fn parent_pid(process_val: &sysinfo::Process) -> Option<Pid> {
+        process_val
+            .parent()
+            .map(|p| p.as_u32() as _)
+            .or_else(|| fallback_macos_ppid(process_val.pid().as_u32() as _))
+    }
 }
 
-pub(crate) fn fallback_macos_ppid(pid: Pid) -> Option<Pid> {
+fn fallback_macos_ppid(pid: Pid) -> Option<Pid> {
     sysctl_bindings::kinfo_process(pid)
         .map(|kinfo| kinfo.kp_eproc.e_ppid)
         .ok()
 }
-
-fn get_macos_process_cpu_usage(pids: &[Pid]) -> std::io::Result<HashMap<i32, f64>> {
-    use itertools::Itertools;
-    let output = std::process::Command::new("ps")
-        .args(["-o", "pid=,pcpu=", "-p"])
-        .arg(
-            // Has to look like this since otherwise, it you hit a `unstable_name_collisions` warning.
-            Itertools::intersperse(pids.iter().map(i32::to_string), ",".to_string())
-                .collect::<String>(),
-        )
-        .output()?;
-    let mut result = HashMap::new();
-    String::from_utf8_lossy(&output.stdout)
-        .split_whitespace()
-        .chunks(2)
-        .into_iter()
-        .for_each(|chunk| {
-            let chunk: Vec<&str> = chunk.collect();
-            if chunk.len() != 2 {
-                panic!("Unexpected `ps` output");
-            }
-            let pid = chunk[0].parse();
-            let usage = chunk[1].parse();
-            if let (Ok(pid), Ok(usage)) = (pid, usage) {
-                result.insert(pid, usage);
-            }
-        });
-    Ok(result)
-}
diff --git a/src/app/data_harvester/processes/macos_freebsd.rs b/src/app/data_harvester/processes/macos_freebsd.rs
deleted file mode 100644
index 48bbe717..00000000
--- a/src/app/data_harvester/processes/macos_freebsd.rs
+++ /dev/null
@@ -1,145 +0,0 @@
-//! Shared process data harvesting code from macOS and FreeBSD via sysinfo.
-
-use std::io;
-use std::time::Duration;
-
-use hashbrown::HashMap;
-use sysinfo::{CpuExt, PidExt, ProcessExt, ProcessStatus, System, SystemExt};
-
-use super::ProcessHarvest;
-use crate::{data_harvester::processes::UserTable, utils::error::Result, Pid};
-
-pub fn get_process_data<F>(
-    sys: &System, use_current_cpu_total: bool, unnormalized_cpu: bool, total_memory: u64,
-    user_table: &mut UserTable, backup_cpu_proc_usage: F,
-) -> Result<Vec<ProcessHarvest>>
-where
-    F: Fn(&[Pid]) -> io::Result<HashMap<Pid, f64>>,
-{
-    let mut process_vector: Vec<ProcessHarvest> = Vec::new();
-    let process_hashmap = sys.processes();
-    let cpu_usage = sys.global_cpu_info().cpu_usage() as f64 / 100.0;
-    let num_processors = sys.cpus().len() as f64;
-
-    for process_val in process_hashmap.values() {
-        let name = if process_val.name().is_empty() {
-            let process_cmd = process_val.cmd();
-            if process_cmd.len() > 1 {
-                process_cmd[0].clone()
-            } else {
-                let process_exe = process_val.exe().file_stem();
-                if let Some(exe) = process_exe {
-                    let process_exe_opt = exe.to_str();
-                    if let Some(exe_name) = process_exe_opt {
-                        exe_name.to_string()
-                    } else {
-                        "".to_string()
-                    }
-                } else {
-                    "".to_string()
-                }
-            }
-        } else {
-            process_val.name().to_string()
-        };
-        let command = {
-            let command = process_val.cmd().join(" ");
-            if command.is_empty() {
-                name.to_string()
-            } else {
-                command
-            }
-        };
-
-        let pcu = {
-            let usage = process_val.cpu_usage() as f64;
-            if unnormalized_cpu || num_processors == 0.0 {
-                usage
-            } else {
-                usage / num_processors
-            }
-        };
-        let process_cpu_usage = if use_current_cpu_total && cpu_usage > 0.0 {
-            pcu / cpu_usage
-        } else {
-            pcu
-        };
-
-        let disk_usage = process_val.disk_usage();
-        let process_state = {
-            let ps = process_val.status();
-            (ps.to_string(), convert_process_status_to_char(ps))
-        };
-        let uid = process_val.user_id().map(|u| **u);
-        let pid = process_val.pid().as_u32() as Pid;
-        process_vector.push(ProcessHarvest {
-            pid,
-            parent_pid: {
-                #[cfg(target_os = "macos")]
-                {
-                    process_val
-                        .parent()
-                        .map(|p| p.as_u32() as _)
-                        .or_else(|| super::fallback_macos_ppid(pid))
-                }
-                #[cfg(not(target_os = "macos"))]
-                {
-                    process_val.parent().map(|p| p.as_u32() as _)
-                }
-            },
-            name,
-            command,
-            mem_usage_percent: if total_memory > 0 {
-                process_val.memory() as f64 * 100.0 / total_memory as f64
-            } else {
-                0.0
-            },
-            mem_usage_bytes: process_val.memory(),
-            cpu_usage_percent: process_cpu_usage,
-            read_bytes_per_sec: disk_usage.read_bytes,
-            write_bytes_per_sec: disk_usage.written_bytes,
-            total_read_bytes: disk_usage.total_read_bytes,
-            total_write_bytes: disk_usage.total_written_bytes,
-            process_state,
-            uid,
-            user: uid
-                .and_then(|uid| {
-                    user_table
-                        .get_uid_to_username_mapping(uid)
-                        .map(Into::into)
-                        .ok()
-                })
-                .unwrap_or_else(|| "N/A".into()),
-            time: Duration::from_secs(process_val.run_time()),
-        });
-    }
-
-    let unknown_state = ProcessStatus::Unknown(0).to_string();
-    let cpu_usage_unknown_pids: Vec<Pid> = process_vector
-        .iter()
-        .filter(|process| process.process_state.0 == unknown_state)
-        .map(|process| process.pid)
-        .collect();
-    let cpu_usages = backup_cpu_proc_usage(&cpu_usage_unknown_pids)?;
-    for process in &mut process_vector {
-        if cpu_usages.contains_key(&process.pid) {
-            process.cpu_usage_percent = if unnormalized_cpu || num_processors == 0.0 {
-                *cpu_usages.get(&process.pid).unwrap()
-            } else {
-                *cpu_usages.get(&process.pid).unwrap() / num_processors
-            };
-        }
-    }
-
-    Ok(process_vector)
-}
-
-fn convert_process_status_to_char(status: ProcessStatus) -> char {
-    match status {
-        ProcessStatus::Run => 'R',
-        ProcessStatus::Sleep => 'S',
-        ProcessStatus::Idle => 'D',
-        ProcessStatus::Zombie => 'Z',
-        _ => '?',
-    }
-}
diff --git a/src/app/data_harvester/processes/unix.rs b/src/app/data_harvester/processes/unix.rs
index b0d68e23..1d42c2ca 100644
--- a/src/app/data_harvester/processes/unix.rs
+++ b/src/app/data_harvester/processes/unix.rs
@@ -1,33 +1,36 @@
 //! Unix-specific parts of process collection.
 
-use hashbrown::HashMap;
+mod user_table;
+use cfg_if::cfg_if;
+pub use user_table::*;
 
-use crate::utils::error;
+cfg_if! {
+    if #[cfg(all(target_family = "unix", not(target_os = "linux")))] {
+        mod process_ext;
+        pub(crate) use process_ext::*;
 
-#[derive(Debug, Default)]
-pub struct UserTable {
-    pub uid_user_mapping: HashMap<libc::uid_t, String>,
-}
+        use super::ProcessHarvest;
 
-impl UserTable {
-    pub fn get_uid_to_username_mapping(&mut self, uid: libc::uid_t) -> error::Result<String> {
-        if let Some(user) = self.uid_user_mapping.get(&uid) {
-            Ok(user.clone())
-        } else {
-            // SAFETY: getpwuid returns a null pointer if no passwd entry is found for the uid
-            let passwd = unsafe { libc::getpwuid(uid) };
+        use crate::app::data_harvester::{DataCollector, processes::*};
+        use crate::utils::error;
 
-            if passwd.is_null() {
-                Err(error::BottomError::QueryError("Missing passwd".into()))
-            } else {
-                // SAFETY: We return early if passwd is null.
-                let username = unsafe { std::ffi::CStr::from_ptr((*passwd).pw_name) }
-                    .to_str()?
-                    .to_string();
-                self.uid_user_mapping.insert(uid, username.clone());
+        pub fn sysinfo_process_data(collector: &mut DataCollector) -> error::Result<Vec<ProcessHarvest>> {
+            let sys = &collector.sys;
+            let use_current_cpu_total = collector.use_current_cpu_total;
+            let unnormalized_cpu = collector.unnormalized_cpu;
+            let total_memory = collector.total_memory();
+            let user_table = &mut collector.user_table;
 
-                Ok(username)
+            cfg_if! {
+                if #[cfg(target_os = "macos")] {
+                    MacOSProcessExt::sysinfo_process_data(sys, use_current_cpu_total, unnormalized_cpu, total_memory, user_table)
+                } else if #[cfg(target_os = "freebsd")] {
+                    FreeBSDProcessExt::sysinfo_process_data(sys, use_current_cpu_total, unnormalized_cpu, total_memory, user_table)
+                } else {
+                    GenericProcessExt::sysinfo_process_data(sys, use_current_cpu_total, unnormalized_cpu, total_memory, user_table)
+                }
             }
         }
+
     }
 }
diff --git a/src/app/data_harvester/processes/unix/process_ext.rs b/src/app/data_harvester/processes/unix/process_ext.rs
new file mode 100644
index 00000000..1048fd2d
--- /dev/null
+++ b/src/app/data_harvester/processes/unix/process_ext.rs
@@ -0,0 +1,147 @@
+//! Shared process data harvesting code from macOS and FreeBSD via sysinfo.
+
+use std::io;
+use std::time::Duration;
+
+use hashbrown::HashMap;
+use sysinfo::{CpuExt, PidExt, ProcessExt, ProcessStatus, System, SystemExt};
+
+use super::ProcessHarvest;
+use crate::{data_harvester::processes::UserTable, utils::error, Pid};
+
+pub(crate) trait UnixProcessExt {
+    fn sysinfo_process_data(
+        sys: &System, use_current_cpu_total: bool, unnormalized_cpu: bool, total_memory: u64,
+        user_table: &mut UserTable,
+    ) -> error::Result<Vec<ProcessHarvest>> {
+        let mut process_vector: Vec<ProcessHarvest> = Vec::new();
+        let process_hashmap = sys.processes();
+        let cpu_usage = sys.global_cpu_info().cpu_usage() as f64 / 100.0;
+        let num_processors = sys.cpus().len() as f64;
+
+        for process_val in process_hashmap.values() {
+            let name = if process_val.name().is_empty() {
+                let process_cmd = process_val.cmd();
+                if process_cmd.len() > 1 {
+                    process_cmd[0].clone()
+                } else {
+                    let process_exe = process_val.exe().file_stem();
+                    if let Some(exe) = process_exe {
+                        let process_exe_opt = exe.to_str();
+                        if let Some(exe_name) = process_exe_opt {
+                            exe_name.to_string()
+                        } else {
+                            "".to_string()
+                        }
+                    } else {
+                        "".to_string()
+                    }
+                }
+            } else {
+                process_val.name().to_string()
+            };
+            let command = {
+                let command = process_val.cmd().join(" ");
+                if command.is_empty() {
+                    name.to_string()
+                } else {
+                    command
+                }
+            };
+
+            let pcu = {
+                let usage = process_val.cpu_usage() as f64;
+                if unnormalized_cpu || num_processors == 0.0 {
+                    usage
+                } else {
+                    usage / num_processors
+                }
+            };
+            let process_cpu_usage = if use_current_cpu_total && cpu_usage > 0.0 {
+                pcu / cpu_usage
+            } else {
+                pcu
+            };
+
+            let disk_usage = process_val.disk_usage();
+            let process_state = {
+                let ps = process_val.status();
+                (ps.to_string(), convert_process_status_to_char(ps))
+            };
+            let uid = process_val.user_id().map(|u| **u);
+            let pid = process_val.pid().as_u32() as Pid;
+            process_vector.push(ProcessHarvest {
+                pid,
+                parent_pid: Self::parent_pid(process_val),
+                name,
+                command,
+                mem_usage_percent: if total_memory > 0 {
+                    process_val.memory() as f64 * 100.0 / total_memory as f64
+                } else {
+                    0.0
+                },
+                mem_usage_bytes: process_val.memory(),
+                cpu_usage_percent: process_cpu_usage,
+                read_bytes_per_sec: disk_usage.read_bytes,
+                write_bytes_per_sec: disk_usage.written_bytes,
+                total_read_bytes: disk_usage.total_read_bytes,
+                total_write_bytes: disk_usage.total_written_bytes,
+                process_state,
+                uid,
+                user: uid
+                    .and_then(|uid| {
+                        user_table
+                            .get_uid_to_username_mapping(uid)
+                            .map(Into::into)
+                            .ok()
+                    })
+                    .unwrap_or_else(|| "N/A".into()),
+                time: Duration::from_secs(process_val.run_time()),
+            });
+        }
+
+        if Self::has_backup_proc_cpu_fn() {
+            let unknown_state = ProcessStatus::Unknown(0).to_string();
+            let cpu_usage_unknown_pids: Vec<Pid> = process_vector
+                .iter()
+                .filter(|process| process.process_state.0 == unknown_state)
+                .map(|process| process.pid)
+                .collect();
+            let cpu_usages = Self::backup_proc_cpu(&cpu_usage_unknown_pids)?;
+            for process in &mut process_vector {
+                if cpu_usages.contains_key(&process.pid) {
+                    process.cpu_usage_percent = if unnormalized_cpu || num_processors == 0.0 {
+                        *cpu_usages.get(&process.pid).unwrap()
+                    } else {
+                        *cpu_usages.get(&process.pid).unwrap() / num_processors
+                    };
+                }
+            }
+        }
+
+        Ok(process_vector)
+    }
+
+    #[inline]
+    fn has_backup_proc_cpu_fn() -> bool {
+        false
+    }
+
+    fn backup_proc_cpu(_pids: &[Pid]) -> io::Result<HashMap<Pid, f64>> {
+        Ok(HashMap::default())
+    }
+
+    fn parent_pid(process_val: &sysinfo::Process) -> Option<Pid> {
+        process_val.parent().map(|p| p.as_u32() as _)
+    }
+}
+
+fn convert_process_status_to_char(status: ProcessStatus) -> char {
+    match status {
+        ProcessStatus::Run => 'R',
+        ProcessStatus::Sleep => 'S',
+        ProcessStatus::Idle => 'D',
+        ProcessStatus::Zombie => 'Z',
+        _ => '?',
+    }
+}
diff --git a/src/app/data_harvester/processes/unix/user_table.rs b/src/app/data_harvester/processes/unix/user_table.rs
new file mode 100644
index 00000000..6245a858
--- /dev/null
+++ b/src/app/data_harvester/processes/unix/user_table.rs
@@ -0,0 +1,31 @@
+use hashbrown::HashMap;
+
+use crate::utils::error;
+
+#[derive(Debug, Default)]
+pub struct UserTable {
+    pub uid_user_mapping: HashMap<libc::uid_t, String>,
+}
+
+impl UserTable {
+    pub fn get_uid_to_username_mapping(&mut self, uid: libc::uid_t) -> error::Result<String> {
+        if let Some(user) = self.uid_user_mapping.get(&uid) {
+            Ok(user.clone())
+        } else {
+            // SAFETY: getpwuid returns a null pointer if no passwd entry is found for the uid
+            let passwd = unsafe { libc::getpwuid(uid) };
+
+            if passwd.is_null() {
+                Err(error::BottomError::QueryError("Missing passwd".into()))
+            } else {
+                // SAFETY: We return early if passwd is null.
+                let username = unsafe { std::ffi::CStr::from_ptr((*passwd).pw_name) }
+                    .to_str()?
+                    .to_string();
+                self.uid_user_mapping.insert(uid, username.clone());
+
+