1 files changed, 49 insertions, 0 deletions
diff --git a/src/util/duplex_pipe.c b/src/util/duplex_pipe.c
new file mode 100644
index 0000000..04f23f6
--- /dev/null
+++ b/src/util/duplex_pipe.c
@@ -0,0 +1,49 @@
+/*++
+/* NAME
+/*	duplex_pipe 3
+/* SUMMARY
+/*	local IPD
+/* SYNOPSIS
+/*	#include <iostuff.h>
+/*
+/*	int	duplex_pipe(fds)
+/*	int	*fds;
+/* DESCRIPTION
+/*	duplex_pipe() uses whatever local primitive it takes
+/*	to get a two-way I/O channel.
+/* DIAGNOSTICS
+/*	A null result means success. In case of error, the result
+/*	is -1 and errno is set to the appropriate number.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System libraries */
+
+#include <sys_defs.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+/* Utility library. */
+
+#include "iostuff.h"
+#include "sane_socketpair.h"
+
+/* duplex_pipe - give me a duplex pipe or bust */
+
+int     duplex_pipe(int *fds)
+{
+#ifdef HAS_DUPLEX_PIPE
+    return (pipe(fds));
+#else
+    return (sane_socketpair(AF_UNIX, SOCK_STREAM, 0, fds));
+#endif
+}
+