--- /dev/null
+/* Definitions of flag bits for `waitpid' et al.
+ Copyright (C) 1992-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#if !defined _SYS_WAIT_H && !defined _STDLIB_H
+# error "Never include <bits/waitflags.h> directly; use <sys/wait.h> instead."
+#endif
+
+
+/* Bits in the third argument to `waitpid'. */
+#define WNOHANG 1 /* Don't block waiting. */
+#define WUNTRACED 2 /* Report status of stopped children. */
+
+/* Bits in the fourth argument to `waitid'. */
+#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
+# define WSTOPPED 2 /* Report stopped child (same as WUNTRACED). */
+# define WEXITED 4 /* Report dead child. */
+# define WCONTINUED 8 /* Report continued child. */
+# define WNOWAIT 0x01000000 /* Don't reap, just poll status. */
+#endif
+
+#define __WNOTHREAD 0x20000000 /* Don't wait on children of other threads
+ in this group */
+#define __WALL 0x40000000 /* Wait for any child. */
+#define __WCLONE 0x80000000 /* Wait for cloned process. */
+
+/* The following values are used by the `waitid' function. */
+#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
+# ifndef __ENUM_IDTYPE_T
+# define __ENUM_IDTYPE_T 1
+
+/* The Linux kernel defines these bare, rather than an enum,
+ which causes a conflict if the include order is reversed. */
+# undef P_ALL
+# undef P_PID
+# undef P_PGID
+
+typedef enum
+{
+ P_ALL, /* Wait for any child. */
+ P_PID, /* Wait for specified process. */
+ P_PGID /* Wait for members of process group. */
+} idtype_t;
+# endif
+#endif