129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
/* jobs.h -- structures and stuff used by the jobs.c file. */
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#include "quit.h"
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#if !defined (NO_WAIT_H)
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#include <sys/wait.h>
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#else
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#ifdef LITTLE_ENDIAN
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union wait
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{
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int w_status; /* used in syscall */
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/* Terminated process status. */
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struct
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{
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unsigned short
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w_Termsig : 7, /* termination signal */
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w_Coredump : 1, /* core dump indicator */
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w_Retcode : 8, /* exit code if w_termsig==0 */
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w_Fill1 : 16; /* high 16 bits unused */
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} w_T;
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/* Stopped process status. Returned
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only for traced children unless requested
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with the WUNTRACED option bit. */
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struct
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{
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unsigned short
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w_Stopval : 8, /* == W_STOPPED if stopped */
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w_Stopsig : 8, /* actually zero on XENIX */
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w_Fill2 : 16; /* high 16 bits unused */
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} w_S;
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};
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#else /* if !LITTLE_ENDIAN */
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/* For big-endian machines. */
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union wait
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{
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int w_status; /* used in syscall */
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/* Terminated process status. */
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struct
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{
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unsigned short w_Fill1 : 16; /* high 16 bits unused */
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unsigned w_Retcode : 8; /* exit code if w_termsig==0 */
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unsigned w_Coredump : 1; /* core dump indicator */
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unsigned w_Termsig : 7; /* termination signal */
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} w_T;
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/* Stopped process status. Returned
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only for traced children unless requested
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with the WUNTRACED option bit. */
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struct
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{
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unsigned short w_Fill2 : 16; /* high 16 bits unused */
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unsigned w_Stopsig : 8; /* signal that stopped us */
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unsigned w_Stopval : 8; /* == W_STOPPED if stopped */
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} w_S;
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};
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#endif /* LITTLE_ENDIAN */
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#define w_termsig w_T.w_Termsig
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#define w_coredump w_T.w_Coredump
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#define w_retcode w_T.w_Retcode
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#define w_stopval w_S.w_Stopval
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#define w_stopsig w_S.w_Stopsig
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#define WSTOPPED 0177
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#define WIFSTOPPED(x) (((x) . w_stopval) == WSTOPPED)
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#define WIFEXITED(x) ((! (WIFSTOPPED (x))) && (((x) . w_termsig) == 0))
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#define WIFSIGNALED(x) ((! (WIFSTOPPED (x))) && (((x) . w_termsig) != 0))
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#endif /* NO_WAIT_H */
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/* Make sure that parameters to wait3 are defined. */
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#ifndef WNOHANG
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#define WNOHANG 1
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#define WUNTRACED 2
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#endif
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/* I looked it up. For pretty_print_job (). The real answer is 24. */
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#define LONGEST_SIGNAL_DESC 20
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/* We keep an array of jobs. Each entry in the array is a linked list
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of processes that are piped together. The first process encountered is
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the group leader. */
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/* Each child of the shell is remembered in a STRUCT PROCESS. A chain of
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such structures is a pipeline. The chain is circular. */
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typedef struct process {
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struct process *next; /* Next process in the pipeline. A circular chain. */
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int pid; /* Process ID. */
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union wait status; /* The status of this command as returned by wait. */
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int running; /* Non-zero if this process is running. */
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char *command; /* The particular program that is running. */
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} PROCESS;
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/* A description of a pipeline's state. */
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typedef enum { JRUNNING, JSTOPPED, JDEAD, JMIXED } JOB_STATE;
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#define JOBSTATE(job) (jobs[(job)]->state)
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typedef struct job {
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char *wd; /* The working directory at time of invocation. */
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PROCESS *pipe; /* The pipeline of processes that make up this job. */
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int pgrp; /* The process ID of the process group (necessary). */
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int foreground; /* Non-zero if this is running in the foreground. */
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int notified; /* Non-zero if already notified about job state. */
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JOB_STATE state; /* The state that this job is in. */
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int job_control; /* Non-zero if this job started under job control. */
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#ifdef JOB_CONTROL
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COMMAND *deferred; /* Commands that will execute when this job is done. */
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#endif
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} JOB;
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#define NO_JOB -1 /* An impossible job array index. */
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#define DUP_JOB -2 /* A possible return value for get_job_spec (). */
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/* Stuff from the jobs.c file. */
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extern int last_made_pid;
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extern int current_job, previous_job;
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extern int asynchronous_notification;
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extern JOB **jobs;
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extern int job_slots;
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