Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 151 insertions, 0 deletions

diff --git a/lib/util/become_daemon.c b/lib/util/become_daemon.c
new file mode 100644
index 0000000..c6795c5
--- /dev/null
+++ b/lib/util/become_daemon.c
@@ -0,0 +1,151 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Samba utility functions
+   Copyright (C) Andrew Tridgell 1992-1998
+   Copyright (C) Jeremy Allison 2001-2002
+   Copyright (C) Simo Sorce 2001
+   Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
+   Copyright (C) James J Myers 2003
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program 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 General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/filesys.h"
+#include "system/locale.h"
+#if defined(HAVE_LIBSYSTEMD_DAEMON) || defined(HAVE_LIBSYSTEMD)
+#include <systemd/sd-daemon.h>
+#endif
+
+#include "close_low_fd.h"
+#include "debug.h"
+
+#include "become_daemon.h"
+
+static bool sd_notifications = true;
+
+/*******************************************************************
+ Enable or disable daemon status systemd notifications
+********************************************************************/
+void daemon_sd_notifications(bool enable)
+{
+	sd_notifications = enable;
+	DBG_DEBUG("Daemon status systemd notifications %s\n",
+		  sd_notifications ? "enabled" : "disabled");
+}
+
+/****************************************************************************
+ Become a daemon, discarding the controlling terminal.
+****************************************************************************/
+
+void become_daemon(bool do_fork, bool no_session, bool log_stdout)
+{
+	pid_t newpid;
+	if (do_fork) {
+		newpid = fork();
+		if (newpid == -1) {
+			exit_daemon("Fork failed", errno);
+		}
+		if (newpid) {
+			_exit(0);
+		}
+#if defined(HAVE_LIBSYSTEMD_DAEMON) || defined(HAVE_LIBSYSTEMD)
+	} else if (sd_notifications) {
+		sd_notify(0, "STATUS=Starting process...");
+#endif
+	}
+
+	/* detach from the terminal */
+#ifdef HAVE_SETSID
+	if (!no_session) {
+		int ret = setsid();
+		if (ret == -1) {
+			exit_daemon("Failed to create session", errno);
+		}
+	}
+#elif defined(TIOCNOTTY)
+	if (!no_session) {
+		int i = open("/dev/tty", O_RDWR, 0);
+		if (i != -1) {
+			ioctl(i, (int) TIOCNOTTY, (char *)0);
+			close(i);
+		}
+	}
+#endif /* HAVE_SETSID */
+
+	/* Close fd's 0,1,2 as appropriate. Needed if started by rsh. */
+	/* stdin must be open if we do not fork, for monitoring for
+	 * close.  stdout must be open if we are logging there, and we
+	 * never close stderr (but debug might dup it onto a log file) */
+	if (do_fork) {
+		int ret = close_low_fd(0);
+		if (ret != 0) {
+			exit_daemon("close_low_fd(0) failed: %s\n", errno);
+		}
+	}
+	if (!log_stdout) {
+		int ret = close_low_fd(1);
+		if (ret != 0) {
+			exit_daemon("close_low_fd(1) failed: %s\n", errno);
+		}
+	}
+}
+
+void exit_daemon(const char *msg, int error)
+{
+	if (msg == NULL) {
+		msg = strerror(error);
+	}
+
+#if defined(HAVE_LIBSYSTEMD_DAEMON) || defined(HAVE_LIBSYSTEMD)
+	if (sd_notifications) {
+		sd_notifyf(0, "STATUS=daemon failed to start: %s\n"
+				  "ERRNO=%i",
+				  msg,
+				  error);
+	}
+#endif
+	DBG_ERR("daemon failed to start: %s, error code %d\n",
+		msg, error);
+	exit(1);
+}
+
+void daemon_ready(const char *daemon)
+{
+	if (daemon == NULL) {
+		daemon = "Samba";
+	}
+#if defined(HAVE_LIBSYSTEMD_DAEMON) || defined(HAVE_LIBSYSTEMD)
+	if (sd_notifications) {
+		sd_notifyf(0,
+			   "READY=1\nSTATUS=%s: ready to serve connections...",
+			   daemon);
+	}
+#endif
+	DBG_INFO("daemon '%s' finished starting up and ready to serve "
+		"connections\n", daemon);
+}
+
+void daemon_status(const char *daemon, const char *msg)
+{
+	if (daemon == NULL) {
+		daemon = "Samba";
+	}
+#if defined(HAVE_LIBSYSTEMD_DAEMON) || defined(HAVE_LIBSYSTEMD)
+	if (sd_notifications) {
+		sd_notifyf(0, "STATUS=%s: %s", daemon, msg);
+	}
+#endif
+	DBG_STARTUP_NOTICE("daemon '%s' : %s\n", daemon, msg);
+}