Merge sendmail 8.16.1 to HEAD: See contrib/sendmail/RELEASE_NOTES for details

Includes build infrastructure & config updates required for changes in 8.16.1

MFC after:	5 days

1 files changed, 205 insertions, 0 deletions

diff --git a/contrib/sendmail/libsm/notify.c b/contrib/sendmail/libsm/notify.c
new file mode 100644
index 000000000000..9f4cca27d7a8
--- /dev/null
+++ b/contrib/sendmail/libsm/notify.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright (c) 2016 Proofpoint, Inc. and its suppliers.
+ *	All rights reserved.
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the sendmail distribution.
+ *
+ */
+
+#include <sm/gen.h>
+
+#include <sys/types.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>	/* for memset() */
+
+#include <sm/conf.h>	/* FDSET_CAST */
+#include <sm/fdset.h>
+#include <sm/assert.h>
+#include <sm/notify.h>
+
+#if SM_NOTIFY_DEBUG
+#define SM_DBG(p)	fprintf p
+#else
+#define SM_DBG(p)	
+#endif
+
+static int	Notifypipe[2];
+#define NotifyRDpipe Notifypipe[0]
+#define NotifyWRpipe Notifypipe[1]
+
+#define CLOSEFD(fd) do { \
+		if ((fd) != -1) {	\
+			(void) close(fd);	\
+			fd = - 1;	\
+		}	\
+	} while (0)	\
+
+
+/*
+**  SM_NOTIFY_INIT -- initialize notify system
+**
+**	Parameters:
+**		flags -- ignored
+**
+**	Returns:
+**		0: success
+**		<0: -errno
+*/
+
+int
+sm_notify_init(flags)
+	int flags;
+{
+	if (pipe(Notifypipe) < 0)
+		return -errno;
+	return 0;
+}
+
+/*
+**  SM_NOTIFY_START -- start notify system
+**
+**	Parameters:
+**		owner -- owner.
+**		flags -- currently ignored.
+**
+**	Returns:
+**		0: success
+**		<0: -errno
+*/
+
+int
+sm_notify_start(owner, flags)
+	bool owner;
+	int flags;
+{
+	int r;
+
+	r = 0;
+	if (owner)
+		CLOSEFD(NotifyWRpipe);
+	else
+		CLOSEFD(NotifyRDpipe);
+	return r;
+}
+
+/*
+**  SM_NOTIFY_STOP -- stop notify system
+**
+**	Parameters:
+**		owner -- owner.
+**		flags -- currently ignored.
+**
+**	Returns:
+**		0: success
+**		<0: -errno
+*/
+
+int
+sm_notify_stop(owner, flags)
+	bool owner;
+	int flags;
+{
+	if (owner)
+		CLOSEFD(NotifyRDpipe);
+	else
+		CLOSEFD(NotifyWRpipe);
+	return 0;
+}
+
+/*
+**  SM_NOTIFY_SND -- send notification
+**
+**	Parameters:
+**		buf -- where to write data
+**		buflen -- len of buffer
+**
+**	Returns:
+**		0: success
+**		<0: -errno
+*/
+
+int
+sm_notify_snd(buf, buflen)
+	char *buf;
+	size_t buflen;
+{
+	int r;
+	int save_errno;
+
+	SM_REQUIRE(buf != NULL);
+	SM_REQUIRE(buflen > 0);
+	if (NotifyWRpipe < 0)
+		return -EINVAL;
+
+	r = write(NotifyWRpipe, buf, buflen);
+	save_errno = errno;
+	SM_DBG((stderr, "write=%d, fd=%d, e=%d\n", r, NotifyWRpipe, save_errno));
+	return r >= 0 ? 0 : -save_errno;
+}
+
+/*
+**  SM_NOTIFY_RCV -- receive notification
+**
+**	Parameters:
+**		buf -- where to write data
+**		buflen -- len of buffer
+**		tmo -- timeout
+**
+**	Returns:
+**		0: success
+**		<0: -errno
+*/
+
+int
+sm_notify_rcv(buf, buflen, tmo)
+	char *buf;
+	size_t buflen;
+	int tmo;
+{
+	int r;
+	int save_errno;
+	fd_set readfds;
+	struct timeval timeout;
+
+	SM_REQUIRE(buf != NULL);
+	SM_REQUIRE(buflen > 0);
+	if (NotifyRDpipe < 0)
+		return -EINVAL;
+	FD_ZERO(&readfds);
+	SM_FD_SET(NotifyRDpipe, &readfds);
+	timeout.tv_sec = tmo;
+	timeout.tv_usec = 0;
+
+	do {
+		r = select(NotifyRDpipe + 1, FDSET_CAST &readfds, NULL, NULL, &timeout);
+		save_errno = errno;
+		SM_DBG((stderr, "select=%d, fd=%d, e=%d\n", r, NotifyRDpipe, save_errno));
+	} while (r < 0 && save_errno == EINTR);
+
+	if (r <= 0)
+	{
+		SM_DBG((stderr, "select=%d, e=%d\n", r, save_errno));
+		return -ETIMEDOUT;
+	}
+
+	/* bogus... need to check again? */
+	if (!FD_ISSET(NotifyRDpipe, &readfds))
+		return -ETIMEDOUT;
+
+	r = read(NotifyRDpipe, buf, buflen);
+	save_errno = errno;
+	SM_DBG((stderr, "read=%d, e=%d\n", r, save_errno));
+	if (r == 0)
+		return -1;	/* ??? */
+	if (r < 0)
+		return -save_errno;
+	return r;
+}