Remove libc dependency

The function std::process::id() is available in the
"stable" channel now.

Cargo.toml

@@ -19,7 +19,6 @@ serde_derive = "^1.0"
 serde_json   = "^1.0"
 byteorder    = "^1.0"
 log          = "~0.4"
-libc         = "0.2.39" # until std::process::id is stable
 
 [target.'cfg(windows)'.dependencies]
 named_pipe   = "0.3.0"

src/client.rs

@@ -1,4 +1,5 @@
 use serde::{Serialize, de::DeserializeOwned};
+#[allow(unused)]
 use serde_json::Value;
 
 use connection::Manager as ConnectionManager;

src/lib.rs

@@ -7,7 +7,6 @@ extern crate serde;
 extern crate serde_json;
 extern crate byteorder;
 extern crate uuid;
-extern crate libc;
 #[cfg(windows)]
 extern crate named_pipe;
 

src/models/rich_presence.rs

@@ -8,7 +8,7 @@ use utils;
 
 #[derive(Debug, PartialEq, Deserialize, Serialize)]
 pub struct SetActivityArgs {
-    pid: i32,
+    pid: u32,
 
     #[serde(skip_serializing_if = "Option::is_none")]
     activity: Option<Activity>,

src/utils.rs

@@ -1,9 +1,9 @@
-use libc::getpid;
 use uuid::Uuid;
 
 
-pub fn pid() -> i32 {
-    unsafe { getpid() as i32 }
+#[allow(unused)]
+pub fn pid() -> u32 {
+    std::process::id()
 }
 
 pub fn nonce() -> String {