1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)jobs.h 5.1 (Berkeley) 03/07/91 11 */ 12 13 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ 14 #define FORK_FG 0 15 #define FORK_BG 1 16 #define FORK_NOJOB 2 17 18 19 /* 20 * A job structure contains information about a job. A job is either a 21 * single process or a set of processes contained in a pipeline. In the 22 * latter case, pidlist will be non-NULL, and will point to a -1 terminated 23 * array of pids. 24 */ 25 26 struct procstat { 27 short pid; /* process id */ 28 short status; /* status flags (defined above) */ 29 char *cmd; /* text of command being run */ 30 }; 31 32 33 /* states */ 34 #define JOBSTOPPED 1 /* all procs are stopped */ 35 #define JOBDONE 2 /* all procs are completed */ 36 37 38 struct job { 39 struct procstat ps0; /* status of process */ 40 struct procstat *ps; /* status or processes when more than one */ 41 short nprocs; /* number of processes */ 42 short pgrp; /* process group of this job */ 43 char state; /* true if job is finished */ 44 char used; /* true if this entry is in used */ 45 char changed; /* true if status has changed */ 46 #if JOBS 47 char jobctl; /* job running under job control */ 48 #endif 49 }; 50 51 extern short backgndpid; /* pid of last background process */ 52 53 54 #ifdef __STDC__ 55 void setjobctl(int); 56 void showjobs(int); 57 struct job *makejob(union node *, int); 58 int forkshell(struct job *, union node *, int); 59 int waitforjob(struct job *); 60 #else 61 void setjobctl(); 62 void showjobs(); 63 struct job *makejob(); 64 int forkshell(); 65 int waitforjob(); 66 #endif 67 68 #if ! JOBS 69 #define setjobctl(on) /* do nothing */ 70 #endif 71