From 39224cc9be82c0a2abf08c6ae3b98823d42dd262 Mon Sep 17 00:00:00 2001
From: Brendan Kehoe <brendan@zen.org>
Date: Sat, 18 Dec 1993 06:38:01 +0000
Subject: [PATCH] Initial revision

---
 sysdeps/unix/sysv/sysv4/siginfo.h |  0
 sysdeps/unix/sysv/sysv4/waitpid.c | 99 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 sysdeps/unix/sysv/sysv4/siginfo.h
 create mode 100644 sysdeps/unix/sysv/sysv4/waitpid.c

diff --git a/sysdeps/unix/sysv/sysv4/siginfo.h b/sysdeps/unix/sysv/sysv4/siginfo.h
new file mode 100644
index 0000000..e69de29
diff --git a/sysdeps/unix/sysv/sysv4/waitpid.c b/sysdeps/unix/sysv/sysv4/waitpid.c
new file mode 100644
index 0000000..4466141
--- /dev/null
+++ b/sysdeps/unix/sysv/sysv4/waitpid.c
@@ -0,0 +1,99 @@
+/* Copyright (C) 1993 Free Software Foundation, Inc.
+   Contributed by Brendan Kehoe (brendan@zen.org).
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <stddef.h>
+#include "siginfo.h"
+
+typedef enum __idtype
+{
+  /* Look for processes based upon a given PID.  */
+  P_PID,
+
+  /* Look for processes based upon a given process-group ID.  */
+  P_PGID = 2,
+
+  /* Look for any process.  */
+  P_ALL = 7,
+} __idtype_t;
+
+extern __pid_t __getpgid __P ((__pid_t pid));
+extern int __waitid __P ((__idtype_t idtype, __pid_t id,
+			  __siginfo_t *infop, int options));
+
+/* Wait for a child matching PID to die.
+   If PID is greater than 0, match any process whose process ID is PID.
+   If PID is (pid_t) -1, match any process.
+   If PID is (pid_t) 0, match any process with the
+   same process group as the current process.
+   If PID is less than -1, match any process whose
+   process group is the absolute value of PID.
+   If the WNOHANG bit is set in OPTIONS, and that child
+   is not already dead, return (pid_t) 0.  If successful,
+   return PID and store the dead child's status in STAT_LOC.
+   Return (pid_t) -1 for errors.  If the WUNTRACED bit is set in OPTIONS,
+   return status for stopped children; otherwise don't.  */
+
+__pid_t
+DEFUN(__waitpid, (__pid, __stat_loc, __options),
+      __pid_t __pid AND int *__stat_loc AND int __options)
+{
+  __idtype_t idtype;
+  __pid_t tmp_pid = __pid;
+  __siginfo_t infop;
+
+  if (__pid <= WAIT_MYPGRP)
+    {
+      if (__pid == WAIT_ANY)
+	{
+	  /* Request the status for any child.  */
+	  idtype = P_ALL;
+	}
+      else if (__pid == WAIT_MYPGRP)
+	{
+	  /* Request the status for any child process that has
+	     a pgid that's equal to that of our parent.  */
+	  tmp_pid = __getpgid (0);
+	  idtype = P_PGID;
+	}
+      else /* __pid < -1 */
+	{
+	  /* Request the status for any child whose pgid is equal
+	     to the absolute value of PID.  */
+	  tmp_pid = __pid & ~0; /* XXX not pseudo-insn */
+	  idtype = P_PGID;
+	}
+    }
+  else
+    {
+      /* Request the status for the child whose pid is PID.  */
+      idtype = P_PID;
+    }
+
+  if (__waitid (idtype, tmp_pid, &infop, __options | WEXITED | WTRAPPED) < 0)
+    {
+      *__stat_loc = infop.__status;
+      return -1;
+    }
+
+  *__stat_loc = infop.__status;
+  return __pid;
+}
-- 
2.7.4