usr/src/bin/sh/jobs.h

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)jobs.h      5.3 (Berkeley) %G%
 */

/* Mode argument to forkshell.  Don't change FORK_FG or FORK_BG. */
#define FORK_FG 0
#define FORK_BG 1
#define FORK_NOJOB 2


/*
 * A job structure contains information about a job.  A job is either a
 * single process or a set of processes contained in a pipeline.  In the
 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
 * array of pids.
 */

struct procstat {
        short pid;              /* process id */
        short status;           /* status flags (defined above) */
        char *cmd;              /* text of command being run */
};


/* states */
#define JOBSTOPPED 1            /* all procs are stopped */
#define JOBDONE 2               /* all procs are completed */


struct job {
        struct procstat ps0;    /* status of process */
        struct procstat *ps;    /* status or processes when more than one */
        short nprocs;           /* number of processes */
        short pgrp;             /* process group of this job */
        char state;             /* true if job is finished */
        char used;              /* true if this entry is in used */
        char changed;           /* true if status has changed */
#if JOBS
        char jobctl;            /* job running under job control */
#endif
};

extern short backgndpid;        /* pid of last background process */
extern int job_warning;         /* user was warned about stopped jobs */


#ifdef __STDC__
void setjobctl(int);
void showjobs(int);
struct job *makejob(union node *, int);
int forkshell(struct job *, union node *, int);
int waitforjob(struct job *);
char *commandtext(union node *);
#else
void setjobctl();
void showjobs();
struct job *makejob();
int forkshell();
int waitforjob();
char *commandtext();
#endif

#if ! JOBS
#define setjobctl(on)   /* do nothing */
#endif