1 files changed, 110 insertions, 0 deletions
diff --git a/waitlib/waitlib.c b/waitlib/waitlib.c
new file mode 100644
index 0000000..9a5a2e1
--- /dev/null
+++ b/waitlib/waitlib.c
@@ -0,0 +1,110 @@
+/*
+** Copyright 1998 - 2005 Double Precision, Inc.
+** See COPYING for distribution information.
+*/
+
+#ifndef	INCLUDED_FROM_CONFIGURE
+#include	"waitlib.h"
+#endif
+#include	<signal.h>
+#include	<stdio.h>
+
+
+#if	HAVE_SIGPROCMASK
+
+#define HOLD_CHILDREN {\
+	sigset_t ss; sigemptyset(&ss); sigaddset(&ss, SIGCHLD); \
+	sigprocmask(SIG_BLOCK, &ss, NULL);\
+	}
+
+#define RELEASE_CHILDREN {\
+	sigset_t ss; sigemptyset(&ss); sigaddset(&ss, SIGCHLD); \
+	sigprocmask(SIG_UNBLOCK, &ss, NULL);\
+	}
+
+#else
+#if	HAVE_SIGHOLD
+
+#define	HOLD_CHILDREN	sighold(SIGCHLD)
+#define	RELEASE_CHILDREN	sigrelse(SIGCHLD)
+
+#else
+
+#define	HOLD_CHILDREN	sigblock(sigmask(SIGCHLD))
+#define	RELEASE_CHILDREN	sigsetmask(0)
+
+#endif
+#endif
+
+#if	USE_WAIT3
+
+void wait_block()
+{
+	HOLD_CHILDREN;
+}
+
+void wait_clear(RETSIGTYPE (*func)(int))
+{
+	RELEASE_CHILDREN;
+}
+
+void wait_restore()
+{
+	signal(SIGCHLD, SIG_DFL);
+	RELEASE_CHILDREN;
+}
+
+#else
+
+void wait_block()
+{
+	signal(SIGCHLD, SIG_DFL);
+}
+
+void wait_clear(RETSIGTYPE (*func)(int))
+{
+	signal(SIGCHLD, func);
+}
+
+void wait_restore()
+{
+	signal(SIGCHLD, SIG_DFL);
+}
+
+#endif
+
+void wait_reap( void (*func)(pid_t, int), RETSIGTYPE (*handler)(int))
+{
+int	dummy;
+pid_t	p;
+
+#if	USE_WAIT3
+
+	HOLD_CHILDREN;
+
+	while ((p=wait3(&dummy, WNOHANG, 0)) > 0)
+#else
+	if ((p=wait(&dummy)) > 0)
+#endif
+	{
+		(*func)(p, dummy);
+	}
+
+	signal(SIGCHLD, handler);
+
+#if	USE_WAIT3
+	RELEASE_CHILDREN;
+#endif
+
+}
+
+void wait_forchild( void (*reap)(pid_t, int), RETSIGTYPE (*func)(int))
+{
+pid_t	p;
+int	wait_stat;
+
+	signal(SIGCHLD, SIG_DFL);
+	p=wait(&wait_stat);
+	signal(SIGCHLD, func);
+	(*reap)(p, wait_stat);
+}