From 3534f8a3eda03c412e71970fa1f1ce9de49404b7 Mon Sep 17 00:00:00 2001
From: Gregory Anders <greg@gpanders.com>
Date: Mon, 8 Nov 2021 07:48:07 -0700
Subject: [PATCH] std: ppoll: cast number of fds to nfds_t

On some systems, the type of the length of a slice is different from the
nfds_t type, so cast the slice length to nfds_t. This is already done in
poll, so just copy that implementation for ppoll.
---
 lib/std/os.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/std/os.zig b/lib/std/os.zig
index f167e47e2a..66dbe19502 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -5823,7 +5823,8 @@ pub fn ppoll(fds: []pollfd, timeout: ?*const timespec, mask: ?*const sigset_t) P
         ts_ptr = &ts;
         ts = timeout_ns.*;
     }
-    const rc = system.ppoll(fds.ptr, fds.len, ts_ptr, mask);
+    const fds_count = math.cast(nfds_t, fds.len) catch return error.SystemResources;
+    const rc = system.ppoll(fds.ptr, fds_count, ts_ptr, mask);
     switch (errno(rc)) {
         .SUCCESS => return @intCast(usize, rc),
         .FAULT => unreachable,