wip: better handling of cloexec with reused fds for panel and notifications daemon

src/process.rs

@@ -17,3 +17,18 @@ pub(crate) fn mark_as_not_cloexec(file: &impl AsFd) -> Result<()> {
 	.wrap_err("failed to set CLOEXEC on file")?;
 	Ok(())
 }
+
+pub(crate) fn mark_as_cloexec(file: &impl AsFd) -> Result<()> {
+	let raw_fd = file.as_fd().as_raw_fd();
+	let fd_flags = fcntl::FdFlag::from_bits(
+		fcntl::fcntl(raw_fd, fcntl::FcntlArg::F_GETFD)
+			.wrap_err("failed to get GETFD value of stream")?,
+	)
+	.wrap_err("failed to get fd flags from file")?;
+	fcntl::fcntl(
+		raw_fd,
+		fcntl::FcntlArg::F_SETFD(fd_flags.union(fcntl::FdFlag::FD_CLOEXEC)),
+	)
+	.wrap_err("failed to set CLOEXEC on file")?;
+	Ok(())
+}