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//
// job.h
//
// Shell jobs
//
// Copyright (C) 2011 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright 
//    notice, this list of conditions and the following disclaimer.  
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.  
// 3. Neither the name of the project nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
// SUCH DAMAGE.
// 

#ifndef JOB_H
#define JOB_H

#include "sh.h"

#define STD_HANDLES  3

#define J_VAR_SCOPE     0x0001
#define J_ARG_SCOPE     0x0002
#define J_DEFERRED_VARS 0x0004
#define J_LOOP          0x0008
#define J_BREAK         0x0010
#define J_CONTINUE      0x0020
#define J_FUNCTION      0x0040

//
// Arguments
//

struct arg {
  struct arg *next;
  char *value;
};

struct args {
  struct arg *first;
  struct arg *last;
  int num;
};

//
// Variables
//

struct var {
  struct var *next;
  int hash;
  char *name;
  char *value;
};

//
// Job
//

struct job {
  int flags;
  struct shell *shell;
  struct job *parent;
  struct var *vars;
  struct args args;
  int fd[STD_HANDLES];
  int exitcode;
  int handle;
  int pid;
  main_t main;
  struct job *next;
};

void init_shell(struct shell *shell, int argc, char *argv[], char *env[]);
void clear_shell(struct shell *shell);

struct job *create_job(struct job *parent, int flags);
void remove_job(struct job *job);
int execute_job(struct job *job);
void detach_job(struct job *job);
int wait_for_job(struct job *job);

void init_args(struct args *args);
void delete_args(struct args *args);
struct arg *add_arg(struct args *args, char *value);
char *get_command_line(struct args *args);

void set_var(struct job *job, char *name, char *value);
char *get_var(struct job *job, char *name);

struct job *get_arg_scope(struct job *job);
struct job *get_var_scope(struct job *job, int defer);

void set_fd(struct job *job, int h, int fd);
int get_fd(struct job *job, int h, int own);

#endif