zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/app/busybox/src/libbb/systemd_support.c b/ap/app/busybox/src/libbb/systemd_support.c
new file mode 100644
index 0000000..542a3ef
--- /dev/null
+++ b/ap/app/busybox/src/libbb/systemd_support.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2011 Davide Cavalca <davide@geexbox.org>
+ *
+ * Based on http://cgit.freedesktop.org/systemd/tree/src/sd-daemon.c
+ * Copyright 2010 Lennart Poettering
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "libbb.h"
+
+//config:config FEATURE_SYSTEMD
+//config: bool "Enable systemd support"
+//config: default y
+//config: help
+//config: If you plan to use busybox daemons on a system where daemons
+//config: are controlled by systemd, enable this option.
+//config: If you don't use systemd, it is still safe to enable it,
+//config: but the downside is increased code size.
+
+//kbuild:lib-$(CONFIG_FEATURE_SYSTEMD) += systemd_support.o
+
+int sd_listen_fds(void)
+{
+ const char *e;
+ int n;
+ int fd;
+
+ e = getenv("LISTEN_PID");
+ if (!e)
+ return 0;
+ n = xatoi_positive(e);
+ /* Is this for us? */
+ if (getpid() != (pid_t) n)
+ return 0;
+
+ e = getenv("LISTEN_FDS");
+ if (!e)
+ return 0;
+ n = xatoi_positive(e);
+ for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++)
+ close_on_exec_on(fd);
+
+ return n;
+}