Function start_init

freebsd/kern/init_main.c:703–784

* Start the initial user process; try exec'ing each pathname in init_path. * The program is invoked with one argument containing the boot flags. */

 * The program is invoked with one argument containing the boot flags.
 */
static void
start_init(void *dummy)
{
	struct image_args args;
	int error;
	char *var, *path;
	char *free_init_path, *tmp_init_path;
	struct thread *td;
	struct proc *p;
	struct vmspace *oldvmspace;

	TSENTER();	/* Here so we don't overlap with mi_startup. */

	td = curthread;
	p = td->td_proc;

	vfs_mountroot();

	/* Wipe GELI passphrase from the environment. */
	kern_unsetenv("kern.geom.eli.passphrase");

	/* For Multicons, report which console is primary to both */
	if (boothowto & RB_MULTIPLE) {
		if (boothowto & RB_SERIAL)
			printf("Dual Console: Serial Primary, Video Secondary\n");
		else
			printf("Dual Console: Video Primary, Serial Secondary\n");
	}

	if ((var = kern_getenv("init_path")) != NULL) {
		strlcpy(init_path, var, sizeof(init_path));
		freeenv(var);
	}
	free_init_path = tmp_init_path = strdup(init_path, M_TEMP);

	while ((path = strsep(&tmp_init_path, ":")) != NULL) {
		if (bootverbose)
			printf("start_init: trying %s\n", path);

		memset(&args, 0, sizeof(args));
		error = exec_alloc_args(&args);
		if (error != 0)
			panic("%s: Can't allocate space for init arguments %d",
			    __func__, error);

		error = exec_args_add_fname(&args, path, UIO_SYSSPACE);
		if (error != 0)
			panic("%s: Can't add fname %d", __func__, error);
		error = exec_args_add_arg(&args, path, UIO_SYSSPACE);
		if (error != 0)
			panic("%s: Can't add argv[0] %d", __func__, error);
		if (boothowto & RB_SINGLE)
			error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE);
		if (error != 0)
			panic("%s: Can't add argv[0] %d", __func__, error);

		/*
		 * Now try to exec the program.  If can't for any reason