bin/sh/jobs.c

78 static struct job *jobtab;	/* array of jobs */
81 MKINIT struct job *bgjob = NULL; /* last background process */
83 static struct job *jobmru;	/* most recently used job list */
92 static void restartjob(struct job *);
94 static void freejob(struct job *);
95 static struct job *getjob(char *);
96 static pid_t dowait(int, struct job *);
102 static void setcurjob(struct job *);
103 static void deljob(struct job *);
104 static struct job *getcurjob(struct job *);
106 static void printjobcmd(struct job *);
107 static void showjob(struct job *, int);
111  * Turn job control on and off.
155 out:				out2fmt_flush("sh: can't access tty; job control turned off\n");
169 	} else { /* turning job control off */
187 	struct job *jp;
193 		error("job not created under job control");
210 	struct job *jp;
215 			error("job not created under job control");
228 restartjob(struct job *jp)
287 printjobcmd(struct job *jp)
301 showjob(struct job *jp, int mode)
306 	struct job *j;
398  * If the shell is interrupted in the process of creating a job, the
399  * result may be a job structure containing zero processes.  Such structures
407 	struct job *jp;
434  * Mark a job structure as unused.
438 freejob(struct job *jp)
464 	struct job *job;
466 	struct job *jp;
470 		job = getjob(*argptr);
472 		job = NULL;
482 		if (job != NULL) {
483 			if (job->state) {
484 				status = job->ps[job->nprocs - 1].status;
493 				if (! iflag || ! job->changed)
494 					freejob(job);
496 					job->remembered = 0;
497 					if (job == bgjob)
523 	} while (dowait(1, (struct job *)NULL) != -1);
534 	struct job *jp;
548  * Convert a job name to a job structure.
551 static struct job *
555 	struct job *found, *jp;
562 			error("No current job");
565 		error("No current job");
581 				error("No previous job");
617 	error("No such job: %s", name);
626 	struct job *jp;
633  * Return a new job structure,
636 struct job *
640 	struct job *jp;
703 setcurjob(struct job *cj)
705 	struct job *jp, *prev;
723 deljob(struct job *j)
725 	struct job *jp, *prev;
739  * Return the most recently used job that isn't `nj', and preferably one
742 static struct job *
743 getcurjob(struct job *nj)
745 	struct job *jp;
751 	/* Otherwise the most recently used job that isn't `nj' */
762  * Fork of a subshell.  If we are doing job control, give the subshell its
763  * own process group.  Jp is a job structure that the job is to be added to.
769  *		     process group even if job control is on.
771  * When job control is turned off, background processes have their standard
777 forkshell(struct job *jp, union node *n, int mode)
795 		struct job *p;
808 		jobctl = 0;		/* do job control only in root shell */
890 vforkexecshell(struct job *jp, char **argv, char **envp, const char *path, int idx, int pip[2])
939  * Wait for job to finish.
941  * Under job control we have the problem that while a child process is
944  * active user may be hard to kill.  With job control turned off, an
958 waitforjob(struct job *jp, int *origstatus)
1014 dowait(int block, struct job *job)
1019 	struct job *jp;
1020 	struct job *thisjob;
1034 	if (pid == -1 && errno == ECHILD && job != NULL)
1035 		job->state = JOBDONE;
1069 					if (jp != job) {
1085 	else if ((!rootshell || !iflag || thisjob == job) &&
1105 		TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job));
1114  * Do a wait system call.  If job control is compiled in, we accept
1141 	struct job *jp;