1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
#pragma once
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include "global.h"
#define MAXJOBS 16 /* max jobs at any point in time */
#define MAXJID 1<<16 /* max job ID */
namespace ov4
{
extern struct job_t _jobs[];
extern int nextjid;
/*
* Jobs states: FG (foreground), BG (background), ST (stopped)
* Job state transitions and enabling actions:
* FG -> ST : ctrl-z
* ST -> FG : fg command
* ST -> BG : bg command
* BG -> FG : fg command
* At most 1 job can be in the FG state.
*/
enum job_status
{
UNDEF,
FG,
BG,
ST
};
struct job_t { /* The job struct */
pid_t pid; /* job PID */
int jid; /* job ID [1, 2, ...] */
int state; /* UNDEF, BG, FG, or ST */
char cmdline[MAXLINE]; /* command line */
};
void clearjob(struct job_t *job = _jobs);
void initjobs(struct job_t *job = _jobs);
int maxjid(struct job_t *job = _jobs);
int addjob(pid_t pid, int state, const char *cmdline, struct job_t *job = _jobs);
int deletejob(pid_t pid, struct job_t *job = _jobs);
pid_t fgpid(struct job_t *job = _jobs);
struct job_t *getjobpid(pid_t pid, struct job_t *job = _jobs);
struct job_t *getjobjid(int jid, struct job_t *job = _jobs);
int pid2jid(pid_t pid, struct job_t *job = _jobs);
void listjobs(struct job_t *job = _jobs);
bool job_suspend(pid_t pid, struct job_t *job = _jobs);
}
|
