add early handler

1 files changed, 87 insertions, 0 deletions

diff --git a/early.c b/early.c
new file mode 100644
index 0000000..063e1a6
--- /dev/null
+++ b/early.c
@@ -0,0 +1,87 @@
+/*
+ * 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/mount.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "procd.h"
+
+static void early_mounts(void)
+{
+	mount("proc", "/proc", "proc", 0, 0);
+	mount("sysfs", "/sys", "sysfs", 0, 0);
+
+	mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV, "size=512k,mode=1777");
+	mkdir("/tmp/run", 0777);
+	mkdir("/tmp/lock", 0777);
+	mkdir("/tmp/state", 0777);
+	symlink("/tmp", "/var");
+
+	mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755,size=512K");
+	mkdir("/dev/shm", 0755);
+	mkdir("/dev/pts", 0755);
+	mount("devpts", "/dev/pts", "devpts", 0, 0);
+}
+
+static void early_dev(void)
+{
+	mkdev("*", 0600);
+}
+
+static void early_console(const char *dev)
+{
+	struct stat s;
+	int dd;
+
+	if (stat(dev, &s))
+		mkdev("*console", 0600);
+
+	dd = open(dev, O_RDWR);
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+
+	if (dd < 0) {
+		ERROR("Failed to open %s\n", dev);
+		return;
+	}
+
+	dup2(dd, STDIN_FILENO);
+	dup2(dd, STDOUT_FILENO);
+	dup2(dd, STDERR_FILENO);
+	close(dd);
+}
+
+static void early_env(void)
+{
+	setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin", 1);
+}
+
+void procd_early(void)
+{
+	if (getpid() != 1)
+		return;
+
+	early_mounts();
+	early_dev();
+	early_env();
+	early_console("/dev/console");
+
+	LOG("Console is alive\n");
+}