From c58049d48d7081fad18ae2abbe9ca572309ded5f Mon Sep 17 00:00:00 2001
From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
Date: Sat, 25 Jul 2020 20:05:29 +0200
Subject: [PATCH] mescc: Mes C Library: Add waitpid for M2-Planet.

* lib/m2/waitpid.c: New file.
---
 lib/m2/waitpid.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 lib/m2/waitpid.c

diff --git a/lib/m2/waitpid.c b/lib/m2/waitpid.c
new file mode 100644
index 00000000..a3d98d1d
--- /dev/null
+++ b/lib/m2/waitpid.c
@@ -0,0 +1,39 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2016,2017,2018,2019,2020,2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+#include <linux/syscall.h>
+#include <syscall.h>
+#include <sys/types.h>
+
+int
+waitpid (int pid, int *status_ptr, int options)
+{
+  long long_pid = pid;
+  long long_status_ptr = cast_voidp_to_long (status_ptr);
+  long long_options = options;
+//##if __i386__
+//#  return _sys_call3 (SYS_waitpid, long_pid, long_status_ptr, long_options);
+//##elif __x86_64__ || __arm__
+  return _sys_call4 (SYS_wait4, long_pid, long_status_ptr, long_options, 0);
+//##else
+//##error arch not supported
+//##endif
+}