554 lines
14 KiB
C
554 lines
14 KiB
C
/**
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* \addtogroup shell
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* @{
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*/
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/*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: shell.c,v 1.13 2009/03/02 20:44:15 adamdunkels Exp $
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*/
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/**
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* \file
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* The shell application
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki.h"
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#include "contiki-lib.h"
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#include "net/rime.h"
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#include "shell.h"
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#include <ctype.h>
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#include <string.h>
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#include <stdio.h>
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LIST(commands);
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int shell_event_input;
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static struct process *front_process;
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static unsigned long time_offset;
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PROCESS(shell_process, "Shell");
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PROCESS(shell_server_process, "Shell server");
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/*---------------------------------------------------------------------------*/
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PROCESS(help_command_process, "help");
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SHELL_COMMAND(help_command, "help", "help: shows this help",
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&help_command_process);
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SHELL_COMMAND(question_command, "?", "?: shows this help",
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&help_command_process);
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PROCESS(shell_killall_process, "killall");
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SHELL_COMMAND(killall_command, "killall", "killall: stop all running commands",
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&shell_killall_process);
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PROCESS(shell_kill_process, "kill");
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SHELL_COMMAND(kill_command, "kill", "kill <command>: stop a specific command",
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&shell_kill_process);
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PROCESS(shell_null_process, "null");
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SHELL_COMMAND(null_command,
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"null",
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"null: discard input",
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&shell_null_process);
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(shell_null_process, ev, data)
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{
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struct shell_input *input;
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PROCESS_BEGIN();
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while(1) {
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PROCESS_WAIT_EVENT_UNTIL(ev == shell_event_input);
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input = data;
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if(input->len1 + input->len2 == 0) {
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PROCESS_EXIT();
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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static void
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command_kill(struct shell_command *c)
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{
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if(c != NULL) {
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shell_output_str(&killall_command, "Stopping command ", c->command);
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process_exit(c->process);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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killall(void)
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{
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struct shell_command *c;
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for(c = list_head(commands);
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c != NULL;
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c = c->next) {
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if(c != &killall_command && process_is_running(c->process)) {
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command_kill(c);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(shell_killall_process, ev, data)
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{
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PROCESS_BEGIN();
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killall();
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(shell_kill_process, ev, data)
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{
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struct shell_command *c;
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char *name;
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PROCESS_BEGIN();
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name = data;
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if(name == NULL || strlen(name) == 0) {
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shell_output_str(&kill_command,
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"kill <command>: command name must be given", "");
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}
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for(c = list_head(commands);
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c != NULL;
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c = c->next) {
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if(strcmp(name, c->command) == 0 &&
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c != &kill_command &&
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process_is_running(c->process)) {
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command_kill(c);
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PROCESS_EXIT();
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}
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}
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shell_output_str(&kill_command, "Command not found: ", name);
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(help_command_process, ev, data)
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{
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struct shell_command *c;
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PROCESS_BEGIN();
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shell_output_str(&help_command, "Available commands:", "");
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for(c = list_head(commands);
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c != NULL;
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c = c->next) {
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shell_output_str(&help_command, c->description, "");
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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static void
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replace_braces(char *commandline)
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{
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char *ptr;
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int level = 0;
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for(ptr = commandline; *ptr != 0; ++ptr) {
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if(*ptr == '{') {
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if(level == 0) {
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*ptr = ' ';
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}
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++level;
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} else if(*ptr == '}') {
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--level;
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if(level == 0) {
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*ptr = ' ';
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}
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static char *
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find_pipe(char *commandline)
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{
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char *ptr;
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int level = 0;
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for(ptr = commandline; *ptr != 0; ++ptr) {
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if(*ptr == '{') {
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++level;
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} else if(*ptr == '}') {
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--level;
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} else if(*ptr == '|') {
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if(level == 0) {
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return ptr;
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}
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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static struct shell_command *
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start_command(char *commandline, struct shell_command *child)
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{
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char *next, *args;
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int command_len;
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struct shell_command *c;
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/* Shave off any leading spaces. */
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while(*commandline == ' ') {
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commandline++;
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}
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/* Find the next command in a pipeline and start it. */
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next = find_pipe(commandline);
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if(next != NULL) {
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*next = 0;
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child = start_command(next + 1, child);
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}
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/* Separate the command arguments, and remove braces. */
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replace_braces(commandline);
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args = strchr(commandline, ' ');
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if(args != NULL) {
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args++;
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}
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/* Shave off any trailing spaces. */
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command_len = (int)strlen(commandline);
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while(command_len > 0 && commandline[command_len - 1] == ' ') {
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commandline[command_len - 1] = 0;
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command_len--;
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}
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if(args == NULL) {
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command_len = (int)strlen(commandline);
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args = &commandline[command_len];
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} else {
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command_len = (int)(args - commandline - 1);
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}
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/* Go through list of commands to find a match for the first word in
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the command line. */
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for(c = list_head(commands);
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c != NULL &&
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!(strncmp(c->command, commandline, command_len) == 0 &&
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c->command[command_len] == 0);
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c = c->next);
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if(c == NULL) {
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shell_output_str(NULL, commandline, ": command not found (try 'help')");
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command_kill(child);
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c = NULL;
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} else if(process_is_running(c->process) || child == c) {
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shell_output_str(NULL, commandline, ": command already running");
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c->child = NULL;
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c = NULL;
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} else {
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c->child = child;
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/* printf("shell: start_command starting '%s'\n", c->process->name);*/
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/* Start a new process for the command. */
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process_start(c->process, args);
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}
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return c;
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}
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/*---------------------------------------------------------------------------*/
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int
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shell_start_command(char *commandline, int commandline_len,
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struct shell_command *child,
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struct process **started_process)
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{
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struct shell_command *c;
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int background = 0;
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if(commandline_len == 0) {
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if(started_process != NULL) {
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*started_process = NULL;
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}
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return SHELL_NOTHING;
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}
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if(commandline[commandline_len - 1] == '&') {
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commandline[commandline_len - 1] = 0;
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background = 1;
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commandline_len--;
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}
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c = start_command(commandline, child);
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/* Return a pointer to the started process, so that the caller can
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wait for the process to complete. */
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if(c != NULL && started_process != NULL) {
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*started_process = c->process;
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if(background) {
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return SHELL_BACKGROUND;
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} else {
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return SHELL_FOREGROUND;
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}
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}
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return SHELL_NOTHING;
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}
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/*---------------------------------------------------------------------------*/
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static void
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input_to_child_command(struct shell_command *c,
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char *data1, int len1,
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const char *data2, int len2)
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{
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struct shell_input input;
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if(process_is_running(c->process)) {
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input.data1 = data1;
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input.len1 = len1;
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input.data2 = data2;
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input.len2 = len2;
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process_post_synch(c->process, shell_event_input, &input);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_input(char *commandline, int commandline_len)
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{
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struct shell_input input;
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/* printf("shell_input front_process '%s'\n", front_process->name);*/
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if(commandline[0] == '~' &&
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commandline[1] == 'K') {
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/* process_start(&shell_killall_process, commandline);*/
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if(front_process != &shell_process) {
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process_exit(front_process);
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}
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} else {
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if(process_is_running(front_process)) {
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input.data1 = commandline;
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input.len1 = commandline_len;
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input.data2 = "";
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input.len2 = 0;
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process_post_synch(front_process, shell_event_input, &input);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_output_str(struct shell_command *c, char *text1, const char *text2)
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{
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if(c != NULL && c->child != NULL) {
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input_to_child_command(c->child, text1, (int)strlen(text1),
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text2, (int)strlen(text2));
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} else {
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shell_default_output(text1, (int)strlen(text1),
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text2, (int)strlen(text2));
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_output(struct shell_command *c,
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void *data1, int len1,
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const void *data2, int len2)
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{
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if(c != NULL && c->child != NULL) {
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input_to_child_command(c->child, data1, len1, data2, len2);
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} else {
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shell_default_output(data1, len1, data2, len2);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_unregister_command(struct shell_command *c)
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{
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list_remove(commands, c);
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_register_command(struct shell_command *c)
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{
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struct shell_command *i, *p;
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p = NULL;
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for(i = list_head(commands);
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i != NULL &&
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strcmp(i->command, c->command) < 0;
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i = i->next) {
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p = i;
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}
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if(p == NULL) {
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list_push(commands, c);
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} else if(i == NULL) {
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list_add(commands, c);
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} else {
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list_insert(commands, p, c);
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}
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(shell_process, ev, data)
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{
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static struct process *started_process;
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PROCESS_BEGIN();
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/* Let the system start up before showing the prompt. */
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PROCESS_PAUSE();
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while(1) {
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shell_prompt("Contiki> ");
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PROCESS_WAIT_EVENT_UNTIL(ev == shell_event_input);
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{
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struct shell_input *input = data;
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int ret;
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ret = shell_start_command(input->data1, input->len1, NULL,
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&started_process);
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if(started_process != NULL &&
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ret == SHELL_FOREGROUND &&
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process_is_running(started_process)) {
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front_process = started_process;
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PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_EXITED &&
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data == started_process);
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}
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front_process = &shell_process;
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(shell_server_process, ev, data)
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{
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struct process *p;
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struct shell_command *c;
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static struct etimer etimer;
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PROCESS_BEGIN();
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etimer_set(&etimer, CLOCK_SECOND * 10);
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while(1) {
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PROCESS_WAIT_EVENT();
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if(ev == PROCESS_EVENT_EXITED) {
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p = data;
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/* printf("process exited '%s' (front '%s')\n", p->name,
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front_process->name);*/
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for(c = list_head(commands);
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c != NULL && c->process != p;
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c = c->next);
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while(c != NULL) {
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if(c->child != NULL && c->child->process != NULL) {
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/* printf("Killing '%s'\n", c->process->name);*/
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input_to_child_command(c->child, "", 0, "", 0);
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/* process_exit(c->process);*/
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}
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c = c->child;
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}
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} else if(ev == PROCESS_EVENT_TIMER) {
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etimer_reset(&etimer);
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shell_set_time(shell_time());
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_init(void)
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{
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list_init(commands);
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shell_register_command(&help_command);
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shell_register_command(&question_command);
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shell_register_command(&killall_command);
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shell_register_command(&kill_command);
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shell_register_command(&null_command);
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shell_event_input = process_alloc_event();
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process_start(&shell_process, NULL);
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process_start(&shell_server_process, NULL);
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front_process = &shell_process;
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}
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/*---------------------------------------------------------------------------*/
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unsigned long
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shell_strtolong(const char *str, const char **retstr)
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{
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int i;
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unsigned long num = 0;
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const char *strptr = str;
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if(str == NULL) {
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return 0;
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}
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while(*strptr == ' ') {
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++strptr;
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}
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for(i = 0; i < 10 && isdigit(strptr[i]); ++i) {
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num = num * 10 + strptr[i] - '0';
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}
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if(retstr != NULL) {
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if(i == 0) {
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*retstr = str;
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} else {
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*retstr = strptr + i;
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}
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}
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return num;
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}
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/*---------------------------------------------------------------------------*/
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unsigned long
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shell_time(void)
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{
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return clock_seconds() + time_offset;
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_set_time(unsigned long seconds)
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{
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time_offset = seconds - clock_seconds();
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_start(void)
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{
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shell_output_str(NULL, "Contiki command shell", "");
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shell_output_str(NULL, "Type '?' and return for help", "");
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shell_prompt("Contiki> ");
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_quit(void)
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{
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killall();
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process_exit(&shell_process);
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process_exit(&shell_server_process);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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