From 9c45d9ad13fdf439d44d7443ae75da15ea0223ed Mon Sep 17 00:00:00 2001
From: Sam Varshavchik
Date: Mon, 19 Aug 2013 16:39:41 -0400
Subject: Initial checkin

Imported from subversion report, converted to git. Updated all paths in
scripts and makefiles, reflecting the new directory hierarchy.
---
 waitlib/waitlib2.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 waitlib/waitlib2.c

(limited to 'waitlib/waitlib2.c')

diff --git a/waitlib/waitlib2.c b/waitlib/waitlib2.c
new file mode 100644
index 0000000..52dfc26
--- /dev/null
+++ b/waitlib/waitlib2.c
@@ -0,0 +1,114 @@
+/*
+** Copyright 2000-2006 Double Precision, Inc.
+** See COPYING for distribution information.
+*/
+
+#include	"config.h"
+#include	"waitlib.h"
+#include	<stdlib.h>
+#include	<sys/types.h>
+#include	<string.h>
+#include	<signal.h>
+#if	HAVE_UNISTD_H
+#include	<unistd.h>
+#endif
+
+
+static pid_t *static_pid_buf=0;
+
+static void start_reaper(pid_t pid, int exit_stat)
+{
+}
+
+static RETSIGTYPE start_reap(int signum)
+{
+	wait_reap(start_reaper, start_reap);
+
+#if	RETSIGTYPE != void
+	return (0);
+#endif
+}
+
+void wait_forchild( void (*)(pid_t, int), /* Reaper */
+        RETSIGTYPE (*)(int));   /* Signal handler stub */
+
+int wait_startchildren(unsigned nchildren, pid_t **pidptr)
+{
+int	pipefd[2];
+pid_t	p;
+unsigned i;
+
+	if (!pidptr)
+	{
+		if (static_pid_buf)	free(static_pid_buf);
+		static_pid_buf=0;
+		pidptr= &static_pid_buf;
+	}
+
+	if (*pidptr == 0 && (*pidptr=malloc(nchildren * sizeof(pid_t))) == 0)
+		return (-1);
+
+	if (pipe(pipefd) < 0)	return (-1);
+
+	signal(SIGCHLD, start_reap);
+	wait_block();
+	for (i=0; i<nchildren; i++)
+	{
+		p=fork();
+		if (p < 0)
+		{
+			while (i)
+			{
+				kill( (*pidptr)[--i], SIGKILL);
+				wait_forchild(start_reaper, start_reap);
+			}
+			close(pipefd[0]);
+			close(pipefd[1]);
+			wait_clear(start_reap);
+			signal(SIGCHLD, SIG_DFL);
+			return (-1);
+		}
+
+		if (p == 0)
+		{
+		char	buf;
+
+			wait_restore();
+			close(pipefd[1]);
+			if (read(pipefd[0], &buf, 1) != 1)
+				exit(1);
+			close(pipefd[0]);
+			return (1);
+		}
+
+		(*pidptr)[i]=p;
+	}
+	wait_restore();
+	close(pipefd[0]);
+	for (i=0; i<nchildren; i++)
+		if (write(pipefd[1], "", 1) < 0)
+			; /* Shut gcc up */
+	close(pipefd[1]);
+	return (0);
+}
+
+int wait_reforkchild(unsigned nchildren, pid_t *pidptr, pid_t pid)
+{
+unsigned i;
+
+	for (i=0; i<nchildren; i++)
+		if (pidptr[i] == pid)	break;
+
+	if (i >= nchildren)	return (0);
+
+	switch ((pidptr[i]=fork()))	{
+	case 0:
+		wait_restore();	/* Just in case */
+		return (1);
+	case -1:
+		return (-1);
+	default:
+		break;
+	}
+	return (0);
+}
-- 
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