hush.c

	 ** enable command line editing only while a command line
	 ** is actually being read; otherwise, we'll end up bequeathing
	 ** atexit() handlers and other unwanted stuff to our
	 ** child processes (rob@sysgo.de)
	 */
	cmdedit_read_input(prompt_str, the_command);
#else
	fputs(prompt_str, stdout);
	fflush(stdout);
	the_command[0]=fgetc(i->file);
	the_command[1]='\0';
#endif
	fflush(stdout);
	i->p = the_command;
#else
	extern char console_buffer[CFG_CBSIZE];
	int n;
	static char the_command[CFG_CBSIZE];

	i->__promptme = 1;
	if (i->promptmode == 1) {
		n = readline(CFG_PROMPT);
	} else {
		n = readline(CFG_PROMPT_HUSH_PS2);
	}
	if (n == -1 ) {
		flag_repeat = 0;
		i->__promptme = 0;
	}
	n = strlen(console_buffer);
	console_buffer[n] = '\n';
	console_buffer[n+1]= '\0';
	if (had_ctrlc()) flag_repeat = 0;
	clear_ctrlc();
	do_repeat = 0;
	if (i->promptmode == 1) {
		if (console_buffer[0] == '\n'&& flag_repeat == 0) {
			strcpy(the_command,console_buffer);
		}
		else {
			if (console_buffer[0] != '\n') {
				strcpy(the_command,console_buffer);
				flag_repeat = 1;
			}
			else {
				do_repeat = 1;
			}
		}
		i->p = the_command;
	}
	else {
		if (console_buffer[0] != '\n') {
			if (strlen(the_command) + strlen(console_buffer)
			    < CFG_CBSIZE) {
				n = strlen(the_command);
				the_command[n-1] = ' ';
				strcpy(&the_command[n],console_buffer);
			}
			else {
				the_command[0] = '\n';
				the_command[1] = '\0';
				flag_repeat = 0;
			}
		}
		if (i->__promptme == 0) {
			the_command[0] = '\n';
			the_command[1] = '\0';
		}
		i->p = console_buffer;
	}
#endif
}

/* This is the magic location that prints prompts
 * and gets data back from the user */
static int file_get(struct in_str *i)
{
	int ch;

	ch = 0;
	/* If there is data waiting, eat it up */
	if (i->p && *i->p) {
		ch=*i->p++;
	} else {
		/* need to double check i->file because we might be doing something
		 * more complicated by now, like sourcing or substituting. */
#ifndef __U_BOOT__
		if (i->__promptme && interactive && i->file == stdin) {
			while(! i->p || (interactive && strlen(i->p)==0) ) {
#else
			while(! i->p  || strlen(i->p)==0 ) {
#endif
				get_user_input(i);
			}
			i->promptmode=2;
#ifndef __U_BOOT__
			i->__promptme = 0;
#endif
			if (i->p && *i->p) {
				ch=*i->p++;
			}
#ifndef __U_BOOT__
		} else {
			ch = fgetc(i->file);
		}

#endif
		debug_printf("b_getch: got a %d\n", ch);
	}
#ifndef __U_BOOT__
	if (ch == '\n') i->__promptme=1;
#endif
	return ch;
}

/* All the callers guarantee this routine will never be
 * used right after a newline, so prompting is not needed.
 */
static int file_peek(struct in_str *i)
{
#ifndef __U_BOOT__
	if (i->p && *i->p) {
#endif
		return *i->p;
#ifndef __U_BOOT__
	} else {
		i->peek_buf[0] = fgetc(i->file);
		i->peek_buf[1] = '\0';
		i->p = i->peek_buf;
		debug_printf("b_peek: got a %d\n", *i->p);
		return *i->p;
	}
#endif
}

#ifndef __U_BOOT__
static void setup_file_in_str(struct in_str *i, FILE *f)
#else
static void setup_file_in_str(struct in_str *i)
#endif
{
	i->peek = file_peek;
	i->get = file_get;
	i->__promptme=1;
	i->promptmode=1;
#ifndef __U_BOOT__
	i->file = f;
#endif
	i->p = NULL;
}

static void setup_string_in_str(struct in_str *i, const char *s)
{
	i->peek = static_peek;
	i->get = static_get;
	i->__promptme=1;
	i->promptmode=1;
	i->p = s;
}

#ifndef __U_BOOT__
static void mark_open(int fd)
{
	struct close_me *new = xmalloc(sizeof(struct close_me));
	new->fd = fd;
	new->next = close_me_head;
	close_me_head = new;
}

static void mark_closed(int fd)
{
	struct close_me *tmp;
	if (close_me_head == NULL || close_me_head->fd != fd)
		error_msg_and_die("corrupt close_me");
	tmp = close_me_head;
	close_me_head = close_me_head->next;
	free(tmp);
}

static void close_all(void)
{
	struct close_me *c;
	for (c=close_me_head; c; c=c->next) {
		close(c->fd);
	}
	close_me_head = NULL;
}

/* squirrel != NULL means we squirrel away copies of stdin, stdout,
 * and stderr if they are redirected. */
static int setup_redirects(struct child_prog *prog, int squirrel[])
{
	int openfd, mode;
	struct redir_struct *redir;

	for (redir=prog->redirects; redir; redir=redir->next) {
		if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
			/* something went wrong in the parse.  Pretend it didn't happen */
			continue;
		}
		if (redir->dup == -1) {
			mode=redir_table[redir->type].mode;
			openfd = open(redir->word.gl_pathv[0], mode, 0666);
			if (openfd < 0) {
			/* this could get lost if stderr has been redirected, but
			   bash and ash both lose it as well (though zsh doesn't!) */
				perror_msg("error opening %s", redir->word.gl_pathv[0]);
				return 1;
			}
		} else {
			openfd = redir->dup;
		}

		if (openfd != redir->fd) {
			if (squirrel && redir->fd < 3) {
				squirrel[redir->fd] = dup(redir->fd);
			}
			if (openfd == -3) {
				close(openfd);
			} else {
				dup2(openfd, redir->fd);
				if (redir->dup == -1)
					close (openfd);
			}
		}
	}
	return 0;
}

static void restore_redirects(int squirrel[])
{
	int i, fd;
	for (i=0; i<3; i++) {
		fd = squirrel[i];
		if (fd != -1) {
			/* No error checking.  I sure wouldn't know what
			 * to do with an error if I found one! */
			dup2(fd, i);
			close(fd);
		}
	}
}

/* never returns */
/* XXX no exit() here.  If you don't exec, use _exit instead.
 * The at_exit handlers apparently confuse the calling process,
 * in particular stdin handling.  Not sure why? */
static void pseudo_exec(struct child_prog *child)
{
	int i, rcode;
	char *p;
	struct built_in_command *x;
	if (child->argv) {
		for (i=0; is_assignment(child->argv[i]); i++) {
			debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
			p = insert_var_value(child->argv[i]);
			putenv(strdup(p));
			if (p != child->argv[i]) free(p);
		}
		child->argv+=i;  /* XXX this hack isn't so horrible, since we are about
					to exit, and therefore don't need to keep data
					structures consistent for free() use. */
		/* If a variable is assigned in a forest, and nobody listens,
		 * was it ever really set?
		 */
		if (child->argv[0] == NULL) {
			_exit(EXIT_SUCCESS);
		}

		/*
		 * Check if the command matches any of the builtins.
		 * Depending on context, this might be redundant.  But it's
		 * easier to waste a few CPU cycles than it is to figure out
		 * if this is one of those cases.
		 */
		for (x = bltins; x->cmd; x++) {
			if (strcmp(child->argv[0], x->cmd) == 0 ) {
				debug_printf("builtin exec %s\n", child->argv[0]);
				rcode = x->function(child);
				fflush(stdout);
				_exit(rcode);
			}
		}

		/* Check if the command matches any busybox internal commands
		 * ("applets") here.
		 * FIXME: This feature is not 100% safe, since
		 * BusyBox is not fully reentrant, so we have no guarantee the things
		 * from the .bss are still zeroed, or that things from .data are still
		 * at their defaults.  We could exec ourself from /proc/self/exe, but I
		 * really dislike relying on /proc for things.  We could exec ourself
		 * from global_argv[0], but if we are in a chroot, we may not be able
		 * to find ourself... */
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
		{
			int argc_l;
			char** argv_l=child->argv;
			char *name = child->argv[0];

#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
			/* Following discussions from November 2000 on the busybox mailing
			 * list, the default configuration, (without
			 * get_last_path_component()) lets the user force use of an
			 * external command by specifying the full (with slashes) filename.
			 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
			 * _aways_ override external commands, so if you want to run
			 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
			 * filesystem and is _not_ busybox.  Some systems may want this,
			 * most do not.  */
			name = get_last_path_component(name);
#endif
			/* Count argc for use in a second... */
			for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
			optind = 1;
			debug_printf("running applet %s\n", name);
			run_applet_by_name(name, argc_l, child->argv);
		}
#endif
		debug_printf("exec of %s\n",child->argv[0]);
		execvp(child->argv[0],child->argv);
		perror_msg("couldn't exec: %s",child->argv[0]);
		_exit(1);
	} else if (child->group) {
		debug_printf("runtime nesting to group\n");
		interactive=0;    /* crucial!!!! */
		rcode = run_list_real(child->group);
		/* OK to leak memory by not calling free_pipe_list,
		 * since this process is about to exit */
		_exit(rcode);
	} else {
		/* Can happen.  See what bash does with ">foo" by itself. */
		debug_printf("trying to pseudo_exec null command\n");
		_exit(EXIT_SUCCESS);
	}
}

static void insert_bg_job(struct pipe *pi)
{
	struct pipe *thejob;

	/* Linear search for the ID of the job to use */
	pi->jobid = 1;
	for (thejob = job_list; thejob; thejob = thejob->next)
		if (thejob->jobid >= pi->jobid)
			pi->jobid = thejob->jobid + 1;

	/* add thejob to the list of running jobs */
	if (!job_list) {
		thejob = job_list = xmalloc(sizeof(*thejob));
	} else {
		for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
		thejob->next = xmalloc(sizeof(*thejob));
		thejob = thejob->next;
	}

	/* physically copy the struct job */
	memcpy(thejob, pi, sizeof(struct pipe));
	thejob->next = NULL;
	thejob->running_progs = thejob->num_progs;
	thejob->stopped_progs = 0;
	thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */

	/*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
	{
		char *bar=thejob->text;
		char **foo=pi->progs[0].argv;
		while(foo && *foo) {
			bar += sprintf(bar, "%s ", *foo++);
		}
	}

	/* we don't wait for background thejobs to return -- append it
	   to the list of backgrounded thejobs and leave it alone */
	printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
	last_bg_pid = thejob->progs[0].pid;
	last_jobid = thejob->jobid;
}

/* remove a backgrounded job */
static void remove_bg_job(struct pipe *pi)
{
	struct pipe *prev_pipe;

	if (pi == job_list) {
		job_list = pi->next;
	} else {
		prev_pipe = job_list;
		while (prev_pipe->next != pi)
			prev_pipe = prev_pipe->next;
		prev_pipe->next = pi->next;
	}
	if (job_list)
		last_jobid = job_list->jobid;
	else
		last_jobid = 0;

	pi->stopped_progs = 0;
	free_pipe(pi, 0);
	free(pi);
}

/* Checks to see if any processes have exited -- if they
   have, figure out why and see if a job has completed */
static int checkjobs(struct pipe* fg_pipe)
{
	int attributes;
	int status;
	int prognum = 0;
	struct pipe *pi;
	pid_t childpid;

	attributes = WUNTRACED;
	if (fg_pipe==NULL) {
		attributes |= WNOHANG;
	}

	while ((childpid = waitpid(-1, &status, attributes)) > 0) {
		if (fg_pipe) {
			int i, rcode = 0;
			for (i=0; i < fg_pipe->num_progs; i++) {
				if (fg_pipe->progs[i].pid == childpid) {
					if (i==fg_pipe->num_progs-1)
						rcode=WEXITSTATUS(status);
					(fg_pipe->num_progs)--;
					return(rcode);
				}
			}
		}

		for (pi = job_list; pi; pi = pi->next) {
			prognum = 0;
			while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
				prognum++;
			}
			if (prognum < pi->num_progs)
				break;
		}

		if(pi==NULL) {
			debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
			continue;
		}

		if (WIFEXITED(status) || WIFSIGNALED(status)) {
			/* child exited */
			pi->running_progs--;
			pi->progs[prognum].pid = 0;

			if (!pi->running_progs) {
				printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
				remove_bg_job(pi);
			}
		} else {
			/* child stopped */
			pi->stopped_progs++;
			pi->progs[prognum].is_stopped = 1;

#if 0
			/* Printing this stuff is a pain, since it tends to
			 * overwrite the prompt an inconveinient moments.  So
			 * don't do that.  */
			if (pi->stopped_progs == pi->num_progs) {
				printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
			}
#endif
		}
	}

	if (childpid == -1 && errno != ECHILD)
		perror_msg("waitpid");

	/* move the shell to the foreground */
	/*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
	/*	perror_msg("tcsetpgrp-2"); */
	return -1;
}

/* Figure out our controlling tty, checking in order stderr,
 * stdin, and stdout.  If check_pgrp is set, also check that
 * we belong to the foreground process group associated with
 * that tty.  The value of shell_terminal is needed in order to call
 * tcsetpgrp(shell_terminal, ...); */
void controlling_tty(int check_pgrp)
{
	pid_t curpgrp;

	if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
			&& (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
			&& (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
		goto shell_terminal_error;

	if (check_pgrp && curpgrp != getpgid(0))
		goto shell_terminal_error;

	return;

shell_terminal_error:
		shell_terminal = -1;
		return;
}
#endif

/* run_pipe_real() starts all the jobs, but doesn't wait for anything
 * to finish.  See checkjobs().
 *
 * return code is normally -1, when the caller has to wait for children
 * to finish to determine the exit status of the pipe.  If the pipe
 * is a simple builtin command, however, the action is done by the
 * time run_pipe_real returns, and the exit code is provided as the
 * return value.
 *
 * The input of the pipe is always stdin, the output is always
 * stdout.  The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
 * because it tries to avoid running the command substitution in
 * subshell, when that is in fact necessary.  The subshell process
 * now has its stdout directed to the input of the appropriate pipe,
 * so this routine is noticeably simpler.
 */
static int run_pipe_real(struct pipe *pi)
{
	int i;
#ifndef __U_BOOT__
	int nextin, nextout;
	int pipefds[2];				/* pipefds[0] is for reading */
	struct child_prog *child;
	struct built_in_command *x;
	char *p;
# if __GNUC__
	/* Avoid longjmp clobbering */
	(void) &i;
	(void) &nextin;
	(void) &nextout;
	(void) &child;
# endif
#else
	int nextin;
	int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
	struct child_prog *child;
	cmd_tbl_t *cmdtp;
	char *p;
# if __GNUC__
	/* Avoid longjmp clobbering */
	(void) &i;
	(void) &nextin;
	(void) &child;
# endif
#endif	/* __U_BOOT__ */

	nextin = 0;
#ifndef __U_BOOT__
	pi->pgrp = -1;
#endif

	/* Check if this is a simple builtin (not part of a pipe).
	 * Builtins within pipes have to fork anyway, and are handled in
	 * pseudo_exec.  "echo foo | read bar" doesn't work on bash, either.
	 */
	if (pi->num_progs == 1) child = & (pi->progs[0]);
#ifndef __U_BOOT__
	if (pi->num_progs == 1 && child->group && child->subshell == 0) {
		int squirrel[] = {-1, -1, -1};
		int rcode;
		debug_printf("non-subshell grouping\n");
		setup_redirects(child, squirrel);
		/* XXX could we merge code with following builtin case,
		 * by creating a pseudo builtin that calls run_list_real? */
		rcode = run_list_real(child->group);
		restore_redirects(squirrel);
#else
		if (pi->num_progs == 1 && child->group) {
		int rcode;
		debug_printf("non-subshell grouping\n");
		rcode = run_list_real(child->group);
#endif
		return rcode;
	} else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
		for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
		if (i!=0 && child->argv[i]==NULL) {
			/* assignments, but no command: set the local environment */
			for (i=0; child->argv[i]!=NULL; i++) {

				/* Ok, this case is tricky.  We have to decide if this is a
				 * local variable, or an already exported variable.  If it is
				 * already exported, we have to export the new value.  If it is
				 * not exported, we need only set this as a local variable.
				 * This junk is all to decide whether or not to export this
				 * variable. */
				int export_me=0;
				char *name, *value;
				name = xstrdup(child->argv[i]);
				debug_printf("Local environment set: %s\n", name);
				value = strchr(name, '=');
				if (value)
					*value=0;
#ifndef __U_BOOT__
				if ( get_local_var(name)) {
					export_me=1;
				}
#endif
				free(name);
				p = insert_var_value(child->argv[i]);
				set_local_var(p, export_me);
				if (p != child->argv[i]) free(p);
			}
			return EXIT_SUCCESS;   /* don't worry about errors in set_local_var() yet */
		}
		for (i = 0; is_assignment(child->argv[i]); i++) {
			p = insert_var_value(child->argv[i]);
#ifndef __U_BOOT__
			putenv(strdup(p));
#else
			set_local_var(p, 0);
#endif
			if (p != child->argv[i]) {
				child->sp--;
				free(p);
			}
		}
		if (child->sp) {
			char * str = NULL;

			str = make_string((child->argv + i));
			parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
			free(str);
			return last_return_code;
		}
#ifndef __U_BOOT__
		for (x = bltins; x->cmd; x++) {
			if (strcmp(child->argv[i], x->cmd) == 0 ) {
				int squirrel[] = {-1, -1, -1};
				int rcode;
				if (x->function == builtin_exec && child->argv[i+1]==NULL) {
					debug_printf("magic exec\n");
					setup_redirects(child,NULL);
					return EXIT_SUCCESS;
				}
				debug_printf("builtin inline %s\n", child->argv[0]);
				/* XXX setup_redirects acts on file descriptors, not FILEs.
				 * This is perfect for work that comes after exec().
				 * Is it really safe for inline use?  Experimentally,
				 * things seem to work with glibc. */
				setup_redirects(child, squirrel);
#else
			/* check ";", because ,example , argv consist from
			 * "help;flinfo" must not execute
			 */
			if (strchr(child->argv[i], ';')) {
				printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
					child->argv[i]);
				return -1;
			}
			/* Look up command in command table */


			if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
				printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
				return -1;	/* give up after bad command */
			} else {
				int rcode;
#if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
	    extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);

				/* avoid "bootd" recursion */
				if (cmdtp->cmd == do_bootd) {
					if (flag & CMD_FLAG_BOOTD) {
						printf ("'bootd' recursion detected\n");
						return -1;
					}
				else
					flag |= CMD_FLAG_BOOTD;
				}
#endif	/* CFG_CMD_BOOTD */
				/* found - check max args */
				if ((child->argc - i) > cmdtp->maxargs) {
					printf ("Usage:\n%s\n", cmdtp->usage);
					return -1;
				}
#endif
				child->argv+=i;  /* XXX horrible hack */
#ifndef __U_BOOT__
				rcode = x->function(child);
#else
				/* OK - call function to do the command */

				rcode = (cmdtp->cmd)
(cmdtp, flag,child->argc-i,&child->argv[i]);
				if ( !cmdtp->repeatable )
					flag_repeat = 0;


#endif
				child->argv-=i;  /* XXX restore hack so free() can work right */
#ifndef __U_BOOT__

				restore_redirects(squirrel);
#endif

				return rcode;
			}
		}
#ifndef __U_BOOT__
	}

	for (i = 0; i < pi->num_progs; i++) {
		child = & (pi->progs[i]);

		/* pipes are inserted between pairs of commands */
		if ((i + 1) < pi->num_progs) {
			if (pipe(pipefds)<0) perror_msg_and_die("pipe");
			nextout = pipefds[1];
		} else {
			nextout=1;
			pipefds[0] = -1;
		}

		/* XXX test for failed fork()? */
		if (!(child->pid = fork())) {
			/* Set the handling for job control signals back to the default.  */
			signal(SIGINT, SIG_DFL);
			signal(SIGQUIT, SIG_DFL);
			signal(SIGTERM, SIG_DFL);
			signal(SIGTSTP, SIG_DFL);
			signal(SIGTTIN, SIG_DFL);
			signal(SIGTTOU, SIG_DFL);
			signal(SIGCHLD, SIG_DFL);

			close_all();

			if (nextin != 0) {
				dup2(nextin, 0);
				close(nextin);
			}
			if (nextout != 1) {
				dup2(nextout, 1);
				close(nextout);
			}
			if (pipefds[0]!=-1) {
				close(pipefds[0]);  /* opposite end of our output pipe */
			}

			/* Like bash, explicit redirects override pipes,
			 * and the pipe fd is available for dup'ing. */
			setup_redirects(child,NULL);

			if (interactive && pi->followup!=PIPE_BG) {
				/* If we (the child) win the race, put ourselves in the process
				 * group whose leader is the first process in this pipe. */
				if (pi->pgrp < 0) {
					pi->pgrp = getpid();
				}
				if (setpgid(0, pi->pgrp) == 0) {
					tcsetpgrp(2, pi->pgrp);
				}
			}

			pseudo_exec(child);
		}


		/* put our child in the process group whose leader is the
		   first process in this pipe */
		if (pi->pgrp < 0) {
			pi->pgrp = child->pid;
		}
		/* Don't check for errors.  The child may be dead already,
		 * in which case setpgid returns error code EACCES. */
		setpgid(child->pid, pi->pgrp);

		if (nextin != 0)
			close(nextin);
		if (nextout != 1)
			close(nextout);

		/* If there isn't another process, nextin is garbage
		   but it doesn't matter */
		nextin = pipefds[0];
	}
#endif
	return -1;
}

static int run_list_real(struct pipe *pi)
{
	char *save_name = NULL;
	char **list = NULL;
	char **save_list = NULL;
	struct pipe *rpipe;
	int flag_rep = 0;
#ifndef __U_BOOT__
	int save_num_progs;
#endif
	int rcode=0, flag_skip=1;
	int flag_restore = 0;
	int if_code=0, next_if_code=0;  /* need double-buffer to handle elif */
	reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
	/* check syntax for "for" */
	for (rpipe = pi; rpipe; rpipe = rpipe->next) {
		if ((rpipe->r_mode == RES_IN ||
		    rpipe->r_mode == RES_FOR) &&
		    (rpipe->next == NULL)) {
				syntax();
#ifdef __U_BOOT__
				flag_repeat = 0;
#endif
				return 1;
		}
		if ((rpipe->r_mode == RES_IN &&
			(rpipe->next->r_mode == RES_IN &&
			rpipe->next->progs->argv != NULL))||
			(rpipe->r_mode == RES_FOR &&
			rpipe->next->r_mode != RES_IN)) {
				syntax();
#ifdef __U_BOOT__
				flag_repeat = 0;
#endif
				return 1;
		}
	}
	for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
		if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
			pi->r_mode == RES_FOR) {
#ifdef __U_BOOT__
				/* check Ctrl-C */
				ctrlc();
				if ((had_ctrlc())) {
					return 1;
				}
#endif
				flag_restore = 0;
				if (!rpipe) {
					flag_rep = 0;
					rpipe = pi;
				}
		}
		rmode = pi->r_mode;
		debug_printf("rmode=%d  if_code=%d  next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode);
		if (rmode == skip_more_in_this_rmode && flag_skip) {
			if (pi->followup == PIPE_SEQ) flag_skip=0;
			continue;
		}
		flag_skip = 1;
		skip_more_in_this_rmode = RES_XXXX;
		if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
		if (rmode == RES_THEN &&  if_code) continue;
		if (rmode == RES_ELSE && !if_code) continue;
		if (rmode == RES_ELIF && !if_code) break;
		if (rmode == RES_FOR && pi->num_progs) {
			if (!list) {
				/* if no variable values after "in" we skip "for" */
				if (!pi->next->progs->argv) continue;
				/* create list of variable values */
				list = make_list_in(pi->next->progs->argv,
					pi->progs->argv[0]);
				save_list = list;
				save_name = pi->progs->argv[0];
				pi->progs->argv[0] = NULL;
				flag_rep = 1;
			}
			if (!(*list)) {
				free(pi->progs->argv[0]);
				free(save_list);
				list = NULL;
				flag_rep = 0;
				pi->progs->argv[0] = save_name;
#ifndef __U_BOOT__
				pi->progs->glob_result.gl_pathv[0] =
					pi->progs->argv[0];
#endif
				continue;
			} else {
				/* insert new value from list for variable */
				if (pi->progs->argv[0])
					free(pi->progs->argv[0]);
				pi->progs->argv[0] = *list++;
#ifndef __U_BOOT__
				pi->progs->glob_result.gl_pathv[0] =
					pi->progs->argv[0];
#endif
			}
		}
		if (rmode == RES_IN) continue;
		if (rmode == RES_DO) {
			if (!flag_rep) continue;
		}
		if ((rmode == RES_DONE)) {
			if (flag_rep) {
				flag_restore = 1;
			} else {
				rpipe = NULL;
			}
		}
		if (pi->num_progs == 0) continue;
#ifndef __U_BOOT__
		save_num_progs = pi->num_progs; /* save number of programs */
#endif
		rcode = run_pipe_real(pi);
		debug_printf("run_pipe_real returned %d\n",rcode);
#ifndef __U_BOOT__
		if (rcode!=-1) {
			/* We only ran a builtin: rcode was set by the return value
			 * of run_pipe_real(), and we don't need to wait for anything. */
		} else if (pi->followup==PIPE_BG) {
			/* XXX check bash's behavior with nontrivial pipes */
			/* XXX compute jobid */
			/* XXX what does bash do with attempts to background builtins? */
			insert_bg_job(pi);
			rcode = EXIT_SUCCESS;
		} else {
			if (interactive) {
				/* move the new process group into the foreground */
				if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
					perror_msg("tcsetpgrp-3");
				rcode = checkjobs(pi);
				/* move the shell to the foreground */
				if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
					perror_msg("tcsetpgrp-4");
			} else {
				rcode = checkjobs(pi);
			}
			debug_printf("checkjobs returned %d\n",rcode);
		}
		last_return_code=rcode;
#else
		last_return_code=(rcode == 0) ? 0 : 1;
#endif
#ifndef __U_BOOT__
		pi->num_progs = save_num_progs; /* restore number of programs */
#endif
		if ( rmode == RES_IF || rmode == RES_ELIF )
			next_if_code=rcode;  /* can be overwritten a number of times */
		if (rmode == RES_WHILE)
			flag_rep = !last_return_code;
		if (rmode == RES_UNTIL)
			flag_rep = last_return_code;
		if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
		     (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
			skip_more_in_this_rmode=rmode;
#ifndef __U_BOOT__
		checkjobs(NULL);
#endif
	}
	return rcode;
}

/* broken, of course, but OK for testing */
static char *indenter(int i)
{
	static char blanks[]="                                    ";
	return &blanks[sizeof(blanks)-i-1];
}

/* return code is the exit status of the pipe */
static int free_pipe(struct pipe *pi, int indent)
{
	char **p;
	struct child_prog *child;
#ifndef __U_BOOT__
	struct redir_struct *r, *rnext;
#endif
	int a, i, ret_code=0;
	char *ind = indenter(indent);

#ifndef __U_BOOT__
	if (pi->stopped_progs > 0)
		return ret_code;
	final_printf("%s run pipe: (pid %d)\n",ind,getpid());
#endif
	for (i=0; i<pi->num_progs; i++) {
		child = &pi->progs[i];
		final_printf("%s  command %d:\n",ind,i);
		if (child->argv) {
			for (a=0,p=child->argv; *p; a++,p++) {
				final_printf("%s   argv[%d] = %s\n",ind,a,*p);
			}
#ifndef __U_BOOT__
			globfree(&child->glob_result);
#else
			for (a = child->argc;a >= 0;a--) {
				free(child->argv[a]);
			}
					free(child->argv);
			child->argc = 0;
#endif
			child->argv=NULL;
		} else if (child->group) {
#ifndef __U_BOOT__
			final_printf("%s   begin group (subshell:%d)\n",ind, child->subshell);
#endif
			ret_code = free_pipe_list(child->group,indent+3);
			final_printf("%s   end group\n",ind);
		} else {
			final_printf("%s   (nil)\n",ind);
		}
#ifndef __U_BOOT__
		for (r=child->redirects; r; r=rnext) {
			final_printf("%s   redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
			if (r->dup == -1) {
				/* guard against the case >$FOO, where foo is unset or blank */
				if (r->word.gl_pathv) {
					final_printf(" %s\n", *r->word.gl_pathv);