/* jobs.h -- structures and stuff used by the jobs.c file. */

/* Copyright (C) 1993 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software; you can redistribute it and/or modify it under
   the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 2, or (at your option) any later
   version.

   Bash 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.

   You should have received a copy of the GNU General Public License along
   with Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

#if !defined (_JOBS_H_)
#  define _JOBS_H_

#include "quit.h"
#include "siglist.h"

#include "stdc.h"

/* Defines controlling the fashion in which jobs are listed. */
#define JLIST_STANDARD       0
#define JLIST_LONG	     1
#define JLIST_PID_ONLY	     2
#define JLIST_CHANGED_ONLY   3
#define JLIST_NONINTERACTIVE 4

/* If _POSIX_VERSION is not defined, we assume that <sys/wait.h> defines
   a `union wait' and various macros used to manipulate it.  Look in
   bashwait.h for the things we expect to find. */
#if defined (HAVE_SYS_WAIT_H)
#  include <sys/wait.h>
#else /* !HAVE_SYS_WAIT_H */
#  if !defined (_POSIX_VERSION)
#    include "bashwait.h"
#  endif
#endif  /* !HAVE_SYS_WAIT_H */

/* How to get the status of a job.  For Posix, this is just an
   int, but for other systems we have to crack the union wait. */
#if !defined (_POSIX_VERSION)
typedef union wait WAIT;
#  define WSTATUS(t)  (t.w_status)
#else /* _POSIX_VERSION */
typedef int WAIT;
#  define WSTATUS(t)  (t)
#endif /* _POSIX_VERSION */

/* Make sure that parameters to wait3 are defined. */
#if !defined (WNOHANG)
#  define WNOHANG 1
#  define WUNTRACED 2
#endif /* WNOHANG */

/* More Posix P1003.1 definitions.  In the POSIX versions, the parameter is
   passed as an `int', in the non-POSIX version, as `union wait'. */
#if defined (_POSIX_VERSION)

#  if !defined (WSTOPSIG)
#    define WSTOPSIG(s)       ((s) >> 8)
#  endif /* !WSTOPSIG */

#  if !defined (WTERMSIG)
#    define WTERMSIG(s)	      ((s) & 0177)
#  endif /* !WTERMSIG */

#  if !defined (WEXITSTATUS)
#    define WEXITSTATUS(s)    ((s) >> 8)
#  endif /* !WEXITSTATUS */

#  if !defined (WIFSTOPPED)
#    define WIFSTOPPED(s)     (((s) & 0177) == 0177)
#  endif /* !WIFSTOPPED */

#  if !defined (WIFEXITED)
#    define WIFEXITED(s)      (((s) & 0377) == 0)
#  endif /* !WIFEXITED */

#  if !defined (WIFSIGNALED)
#    define WIFSIGNALED(s)    (!WIFSTOPPED(s) && !WIFEXITED(s))
#  endif /* !WIFSIGNALED */

#  if !defined (WIFCORED)
#    define WIFCORED(s)       ((s) & 0200)
#  endif /* !WIFCORED */

#else /* !_POSIX_VERSION */

#  if !defined (WSTOPSIG)
#    define WSTOPSIG(s)	      ((s).w_stopsig)
#  endif /* !WSTOPSIG */

#  if !defined (WTERMSIG)
#    define WTERMSIG(s)	      ((s).w_termsig)
#  endif /* !WTERMSIG */

#  if !defined (WEXITSTATUS)
#    define WEXITSTATUS(s)    ((s).w_retcode)
#  endif /* !WEXITSTATUS */

#  if !defined (WIFCORED)
#    define WIFCORED(s)       ((s).w_coredump)
#  endif /* !WIFCORED */

#endif /* !_POSIX_VERSION */

/* I looked it up.  For pretty_print_job ().  The real answer is 24. */
#define LONGEST_SIGNAL_DESC 24

/* We keep an array of jobs.  Each entry in the array is a linked list
   of processes that are piped together.  The first process encountered is
   the group leader. */

/* Each child of the shell is remembered in a STRUCT PROCESS.  A chain of
   such structures is a pipeline.  The chain is circular. */
typedef struct process {
  struct process *next;	/* Next process in the pipeline.  A circular chain. */
  pid_t pid;		/* Process ID. */
  WAIT status;		/* The status of this command as returned by wait. */
  int running;		/* Non-zero if this process is running. */
  char *command;	/* The particular program that is running. */
} PROCESS;

/* A description of a pipeline's state. */
typedef enum { JRUNNING, JSTOPPED, JDEAD, JMIXED } JOB_STATE;
#define JOBSTATE(job) (jobs[(job)]->state)

#define STOPPED(j)	(jobs[(j)]->state == JSTOPPED)
#define RUNNING(j)	(jobs[(j)]->state == JRUNNING)
#define DEADJOB(j)	(jobs[(j)]->state == JDEAD)

/* Values for the FLAGS field in the JOB struct below. */
#define J_FOREGROUND 0x01 /* Non-zero if this is running in the foreground.  */
#define J_NOTIFIED   0x02 /* Non-zero if already notified about job state.   */
#define J_JOBCONTROL 0x04 /* Non-zero if this job started under job control. */
#define J_NOHUP      0x08 /* Don't send SIGHUP to job if shell gets SIGHUP. */

#define IS_FOREGROUND(j)	((jobs[j]->flags & J_FOREGROUND) != 0)
#define IS_NOTIFIED(j)		((jobs[j]->flags & J_NOTIFIED) != 0)
#define IS_JOBCONTROL(j)	((jobs[j]->flags & J_JOBCONTROL) != 0)

typedef struct job {
  char *wd;	   /* The working directory at time of invocation. */
  PROCESS *pipe;   /* The pipeline of processes that make up this job. */
  pid_t pgrp;	   /* The process ID of the process group (necessary). */
  JOB_STATE state; /* The state that this job is in. */
  int flags;	   /* Flags word: J_NOTIFIED, J_FOREGROUND, or J_JOBCONTROL. */
#if defined (JOB_CONTROL)
  COMMAND *deferred;	/* Commands that will execute when this job is done. */
  VFunction *j_cleanup; /* Cleanup function to call when job marked JDEAD */
  PTR_T cleanarg;	/* Argument passed to (*j_cleanup)() */
#endif /* JOB_CONTROL */
} JOB;

#define NO_JOB  -1	/* An impossible job array index. */
#define DUP_JOB -2	/* A possible return value for get_job_spec (). */

/* A value which cannot be a process ID. */
#define NO_PID (pid_t)-1

/* System calls. */
#if !defined (HAVE_UNISTD_H)
extern pid_t fork (), getpid (), getpgrp ();
#endif /* !HAVE_UNISTD_H */

/* Stuff from the jobs.c file. */
extern pid_t  original_pgrp, shell_pgrp, pipeline_pgrp;
extern pid_t last_made_pid, last_asynchronous_pid;
extern int current_job, previous_job;
extern int asynchronous_notification;
extern JOB **jobs;
extern int job_slots;

extern void making_children __P((void));
extern void stop_making_children __P((void));
extern void cleanup_the_pipeline __P((void));
extern void save_pipeline __P((int));
extern void restore_pipeline __P((int));
extern void start_pipeline __P((void));
extern int stop_pipeline __P((int, COMMAND *));
extern void delete_job __P((int));
extern void nohup_job __P((int));

extern void terminate_current_pipeline __P((void));
extern void terminate_stopped_jobs __P((void));
extern void hangup_all_jobs __P((void));
extern void kill_current_pipeline __P((void));

#if defined (__STDC__) && defined (pid_t)
extern void describe_pid __P((int));
#else
extern void describe_pid __P((pid_t));
#endif

extern void list_one_job __P((JOB *, int, int, int));
extern void list_all_jobs __P((int));
extern void list_stopped_jobs __P((int));
extern void list_running_jobs __P((int));

extern pid_t make_child __P((char *, int));
extern int get_tty_state __P((void));
extern int set_tty_state __P((void));

extern int wait_for_single_pid __P((pid_t));
extern void wait_for_background_pids __P((void));
extern int wait_for __P((pid_t));
extern int wait_for_job __P((int));

extern void notify_and_cleanup __P((void));
extern void reap_dead_jobs __P((void));
extern int start_job __P((int, int));
extern int kill_pid __P((pid_t, int, int));
extern int initialize_jobs __P((void));
extern void initialize_job_signals __P((void));
extern int give_terminal_to __P((pid_t));

extern void set_sigwinch_handler __P((void));
extern void unset_sigwinch_handler __P((void));

extern void unfreeze_jobs_list __P((void));
extern int set_job_control __P((int));
extern void without_job_control __P((void));
extern void end_job_control __P((void));
extern void restart_job_control __P((void));
extern void set_sigchld_handler __P((void));
extern void ignore_tty_job_signals __P((void));
extern void default_tty_job_signals __P((void));

#if defined (JOB_CONTROL)
extern int job_control;
#endif

#endif /* _JOBS_H_ */