Add epoll_pwait

CHANGELOG.md

@@ -6,6 +6,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ## [Unreleased] - ReleaseDate
 ### Added
 
+- Added `epoll_pwait` wrapper
+  (#[1488](https://github.com/nix-rust/nix/pull/1488))
 - Added `TimeSpec::from_duration` and `TimeSpec::from_timespec`
   (#[1465](https://github.com/nix-rust/nix/pull/1465))
 - Added `IPV6_V6ONLY` sockopt.

src/sys/epoll.rs

@@ -1,5 +1,6 @@
 use crate::{Error, Result};
 use crate::errno::Errno;
+use crate::sys::signal::SigSet;
 use libc::{self, c_int};
 use std::os::unix::io::RawFd;
 use std::ptr;
@@ -107,3 +108,13 @@ pub fn epoll_wait(epfd: RawFd, events: &mut [EpollEvent], timeout_ms: isize) ->
 
     Errno::result(res).map(|r| r as usize)
 }
+
+#[cfg(not(target_os = "android"))]
+#[inline]
+pub fn epoll_pwait(epfd: RawFd, events: &mut [EpollEvent], timeout_ms: isize, sigmask: SigSet) -> Result<usize> {
+    let res = unsafe {
+        libc::epoll_pwait(epfd, events.as_mut_ptr() as *mut libc::epoll_event, events.len() as c_int, timeout_ms as c_int, sigmask.as_ref())
+    };
+
+    Errno::result(res).map(|r| r as usize)
+}