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comparison src/sysproc.c @ 0:83c23a36980d

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author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Fri, 26 May 2017 23:11:05 +0900
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-1:000000000000 0:83c23a36980d
1 #include "types.h"
2 #include "arm.h"
3 #include "defs.h"
4 #include "param.h"
5 #include "memlayout.h"
6 #include "mmu.h"
7 #include "proc.h"
8
9 int sys_fork(void)
10 {
11 return fork();
12 }
13
14 int sys_exit(void)
15 {
16 exit();
17 return 0; // not reached
18 }
19
20 int sys_wait(void)
21 {
22 return wait();
23 }
24
25 int sys_kill(void)
26 {
27 int pid;
28
29 if(argint(0, &pid) < 0) {
30 return -1;
31 }
32
33 return kill(pid);
34 }
35
36 int sys_getpid(void)
37 {
38 return proc->pid;
39 }
40
41 int sys_sbrk(void)
42 {
43 int addr;
44 int n;
45
46 if(argint(0, &n) < 0) {
47 return -1;
48 }
49
50 addr = proc->sz;
51
52 if(growproc(n) < 0) {
53 return -1;
54 }
55
56 return addr;
57 }
58
59 int sys_sleep(void)
60 {
61 int n;
62 uint ticks0;
63
64 if(argint(0, &n) < 0) {
65 return -1;
66 }
67
68 acquire(&tickslock);
69
70 ticks0 = ticks;
71
72 while(ticks - ticks0 < n){
73 if(proc->killed){
74 release(&tickslock);
75 return -1;
76 }
77
78 sleep(&ticks, &tickslock);
79 }
80
81 release(&tickslock);
82 return 0;
83 }
84
85 // return how many clock tick interrupts have occurred
86 // since start.
87 int sys_uptime(void)
88 {
89 uint xticks;
90
91 acquire(&tickslock);
92 xticks = ticks;
93 release(&tickslock);
94
95 return xticks;
96 }