Auto merge of #336 - kamalmarhubi:pause, r=fiveop

unistd: Add pause(2)

Author: homu

src/unistd.rs

@@ -356,6 +356,13 @@ pub fn setgid(gid: gid_t) -> Result<()> {
     Errno::result(res).map(drop)
 }
 
+#[inline]
+pub fn pause() -> Result<()> {
+    let res = unsafe { libc::pause() };
+
+    Errno::result(res).map(drop)
+}
+
 #[cfg(any(target_os = "linux", target_os = "android"))]
 mod linux {
     use sys::syscall::{syscall, SYSPIVOTROOT};

test/sys/test_wait.rs

@@ -7,7 +7,7 @@ use libc::exit;
 #[test]
 fn test_wait_signal() {
     match fork() {
-      Ok(Child) => loop { /* Wait for signal */ },
+      Ok(Child) => pause().unwrap_or(()),
       Ok(Parent(child_pid)) => {
           kill(child_pid, SIGKILL).ok().expect("Error: Kill Failed");
           assert_eq!(waitpid(child_pid, None), Ok(WaitStatus::Signaled(child_pid, SIGKILL, false)));