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Night Owl Shareware (NOPV7)(Night Owl Publisher Inc.)(1992).bin
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038a
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bash1_12.arj
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BASH1-12.TAR
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bash-1.12
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jobs.h
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C/C++ Source or Header
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1991-07-13
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7KB
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238 lines
/* jobs.h -- structures and stuff used by the jobs.c file. */
#include "quit.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
/* Cadmus machines are brain-dead from the moment of fission, like all
bacteria. */
#if defined (cadmus) || defined (BrainDeath)
# undef HAVE_WAIT_H
#endif /* BrainDeath */
/* HP/UX 6.x sys/wait.h is a complete loss when it comes to the WIF macros.
Pretend we don't have a wait.h. */
#if defined (hpux) && !defined (_POSIX_VERSION)
#undef HAVE_WAIT_H
#endif
#if defined (HAVE_WAIT_H)
#include <sys/wait.h>
#else
#include "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 /* if !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 */
#if !defined (_POSIX_VERSION)
#define pid_t int
typedef union wait WAIT;
#else
typedef int WAIT;
#endif /* _POSIX_VERSION */
/* 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 WSTATUS(t) (t)
#else
#define WSTATUS(t) (t.w_status)
#endif
/* 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 these definitions, `s' is a
`union wait' (the 1003.1 spec says they are `int'). */
#if !defined (WSTOPSIG)
#define WSTOPSIG(s) ((s).w_stopsig)
#define WTERMSIG(s) ((s).w_termsig)
#define WEXITSTATUS(s) ((s).w_retcode)
#endif /* WSTOPSIG */
#if !defined (WIFCORED)
#if !defined (_POSIX_VERSION)
#define WIFCORED(s) ((s).w_coredump)
#else
#define WIFCORED(s) ((s) & 0200)
#endif /* _POSIX_VERSION */
#endif /* WIFCORED */
/* 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)
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). */
int foreground; /* Non-zero if this is running in the foreground. */
int notified; /* Non-zero if already notified about job state. */
JOB_STATE state; /* The state that this job is in. */
int job_control; /* Non-zero if this job started under job control. */
#ifdef JOB_CONTROL
COMMAND *deferred; /* Commands that will execute when this job is done. */
#endif
} 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 */
#ifndef SIGABRT
#define SIGABRT SIGIOT
#endif
#ifndef SIGCHLD
#define SIGCHLD SIGCLD
#endif
#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)
/* Add SIG to the contents of SET. */
#define sigaddset(set, sig) *(set) |= sigmask (sig)
/* Suspend the process until the reception of one of the signals
not present in SET. */
#define sigsuspend(set) sigpause (*(set))
/* END of POSIX 1003.1 definitions. */
#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. */
extern pid_t fork (), getpid (), getpgrp ();
/* Stuff from the jobs.c file. */
extern pid_t original_pgrp, shell_pgrp, pipeline_pgrp;
extern pid_t last_made_pid, last_asynchronous_pid, make_child ();
extern int current_job, previous_job;
extern int asynchronous_notification;
extern JOB **jobs;
extern int job_slots;