jobs.h revision 1557 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)jobs.h	8.1 (Berkeley) 5/31/93
37 */
38
39/* Mode argument to forkshell.  Don't change FORK_FG or FORK_BG. */
40#define FORK_FG 0
41#define FORK_BG 1
42#define FORK_NOJOB 2
43
44
45/*
46 * A job structure contains information about a job.  A job is either a
47 * single process or a set of processes contained in a pipeline.  In the
48 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
49 * array of pids.
50 */
51
52struct procstat {
53	short pid;		/* process id */
54	short status;		/* status flags (defined above) */
55	char *cmd;		/* text of command being run */
56};
57
58
59/* states */
60#define JOBSTOPPED 1		/* all procs are stopped */
61#define JOBDONE 2		/* all procs are completed */
62
63
64struct job {
65	struct procstat ps0;	/* status of process */
66	struct procstat *ps;	/* status or processes when more than one */
67	short nprocs;		/* number of processes */
68	short pgrp;		/* process group of this job */
69	char state;		/* true if job is finished */
70	char used;		/* true if this entry is in used */
71	char changed;		/* true if status has changed */
72#if JOBS
73	char jobctl;		/* job running under job control */
74#endif
75};
76
77extern short backgndpid;	/* pid of last background process */
78extern int job_warning;		/* user was warned about stopped jobs */
79
80
81#ifdef __STDC__
82void setjobctl(int);
83void showjobs(int);
84struct job *makejob(union node *, int);
85int forkshell(struct job *, union node *, int);
86int waitforjob(struct job *);
87char *commandtext(union node *);
88#else
89void setjobctl();
90void showjobs();
91struct job *makejob();
92int forkshell();
93int waitforjob();
94char *commandtext();
95#endif
96
97#if ! JOBS
98#define setjobctl(on)	/* do nothing */
99#endif
100