add preinit handler

diff --git a/preinit.c b/preinit.c
new file mode 100644 (file)
index 0000000..f322be1
--- /dev/null
+++ b/preinit.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * 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.
+ */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+
+#include <unistd.h>
+#include <unistd.h>
+
+#include "procd.h"
+#include "hotplug.h"
+#include "watchdog.h"
+
+static struct uloop_process preinit;
+
+static void spawn_procd(struct uloop_process *proc, int ret)
+{
+       char *wdt_fd = watchdog_fd();
+       char *argv[] = { "/sbin/procd", NULL };
+
+       unsetenv("INITRAMFS");
+       unsetenv("PREINIT");
+       DEBUG(1, "Exec to real procd now\n");
+       if (wdt_fd)
+               setenv("WDTFD", wdt_fd, 1);
+       execvp(argv[0], argv);
+}
+
+void procd_preinit(void)
+{
+       char *argv[] = { "/bin/sh", "/etc/preinit", NULL };
+
+       LOG("- preinit -\n");
+
+       setenv("PREINIT", "1", 1);
+       preinit.cb = spawn_procd;
+       preinit.pid = fork();
+       if (!preinit.pid) {
+               execvp(argv[0], argv);
+               ERROR("Failed to start preinit\n");
+               exit(-1);
+       }
+
+       if (preinit.pid <= 0) {
+               ERROR("Failed to start new preinit instance\n");
+               return;
+       }
+
+       uloop_process_add(&preinit);
+       DEBUG(2, "Launched preinit instance, pid=%d\n", (int) preinit.pid);
+}