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