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/* 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
#if defined (HAVE_WAIT_H)
# include <sys/wait.h>
#else /* !HAVE_WAIT_H */
# include "bash_endian.h"
# if !defined (_POSIX_VERSION)
# if defined (LITTLE_ENDIAN)
union wait
{
int w_status; /* used in syscall */
/* Terminated process status. */
struct
{
unsigned short
w_Termsig : 7, /* termination signal */
w_Coredump : 1, /* core dump indicator */
w_Retcode : 8, /* exit code if w_termsig==0 */
w_Fill1 : 16; /* high 16 bits unused */
} w_T;
/* Stopped process status. Returned
only for traced children unless requested
with the WUNTRACED option bit. */
struct
{
unsigned short
w_Stopval : 8, /* == W_STOPPED if stopped */
w_Stopsig : 8, /* actually zero on XENIX */
w_Fill2 : 16; /* high 16 bits unused */
} w_S;
};
# else /* !LITTLE_ENDIAN */
/* This is for big-endian machines like the IBM RT, HP 9000, or Sun-3 */
union wait
{
int w_status; /* used in syscall */
/* Terminated process status. */
struct
{
unsigned short w_Fill1 : 16; /* high 16 bits unused */
unsigned w_Retcode : 8; /* exit code if w_termsig==0 */
unsigned w_Coredump : 1; /* core dump indicator */
unsigned w_Termsig : 7; /* termination signal */
} w_T;
/* Stopped process status. Returned
only for traced children unless requested
with the WUNTRACED option bit. */
struct
{
unsigned short w_Fill2 : 16; /* high 16 bits unused */
unsigned w_Stopsig : 8; /* signal that stopped us */
unsigned w_Stopval : 8; /* == W_STOPPED if stopped */
} w_S;
};
# endif /* !LITTLE_ENDIAN */
# define w_termsig w_T.w_Termsig
# define w_coredump w_T.w_Coredump
# define w_retcode w_T.w_Retcode
# define w_stopval w_S.w_Stopval
# define w_stopsig w_S.w_Stopsig
/* Note that sys/wait.h defines these for Posix systems. */
# define WSTOPPED 0177
# define WIFSTOPPED(x) (((x) . w_stopval) == WSTOPPED)
# define WIFEXITED(x) ((! (WIFSTOPPED (x))) && (((x) . w_termsig) == 0))
# define WIFSIGNALED(x) ((! (WIFSTOPPED (x))) && (((x) . w_termsig) != 0))
# endif /* !_POSIX_VERSION */
#endif /* !HAVE_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)
# define pid_t int
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)
/* 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. */
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. */
#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
#if !defined (_POSIX_VERSION) && !defined (sigmask)
# define sigmask(x) (1 << ((x)-1))
#endif /* !POSIX && !sigmask */
#if !defined (SIGABRT)
# define SIGABRT SIGIOT
#endif /* !SIGABRT */
#if !defined (SIGCHLD)
# define SIGCHLD SIGCLD
#endif /* !SIGCHLD */
#if !defined (_POSIX_VERSION)
# if !defined (SIG_BLOCK)
# define SIG_BLOCK 2
# define SIG_SETMASK 3
# endif /* SIG_BLOCK */
/* Type of a signal set. */
# define sigset_t int
/* Make sure there is nothing inside the signal set. */
# define sigemptyset(set) (*(set) = 0)
/* Initialize the signal set to hold all signals. */
# define sigfillset(set) (*set) = sigmask (NSIG) - 1
/* Add SIG to the contents of SET. */
# define sigaddset(set, sig) *(set) |= sigmask (sig)
/* Delete SIG from signal set SET. */
# define sigdelset(set, sig) *(set) &= ~sigmask (sig)
/* Is SIG a member of the signal set SET? */
# define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)
/* Suspend the process until the reception of one of the signals
not present in SET. */
# define sigsuspend(set) sigpause (*(set))
#endif /* !_POSIX_VERSION */
/* These definitions are used both in POSIX and non-POSIX implementations. */
#define BLOCK_SIGNAL(sig, nvar, ovar) \
sigemptyset (&nvar); \
sigaddset (&nvar, sig); \
sigemptyset (&ovar); \
sigprocmask (SIG_BLOCK, &nvar, &ovar)
#if defined (_POSIX_VERSION)
# define BLOCK_CHILD(nvar, ovar) \
BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
# define UNBLOCK_CHILD(ovar) \
sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
#else /* !_POSIX_VERSION */
# define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
# define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
#endif /* !_POSIX_VERSION */
/* System calls. */
#if !defined (SunOS5) && !defined (USGr4_2) && !defined (__BSD_4_4__)
extern pid_t fork (), getpid (), getpgrp ();
#endif /* !SunOS5 && !USGr4_2 && !__BSD_4_4__ */
/* 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 start_pipeline __P((void));
extern int stop_pipeline __P((int, COMMAND *));
extern void delete_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 int list_one_job __P((JOB *, int, int, int));
extern void list_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 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));
#if defined (JOB_CONTROL)
extern int job_control;
#endif
#endif /* __JOBS_H__ */
|
