xv6-kernel-threads/sysproc.c at master · kanhaiya38/xv6-kernel-threads · GitHub

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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
#include "types.h"
#include "x86.h"
#include "defs.h"
#include "date.h"
#include "param.h"
#include "memlayout.h"
#include "mmu.h"
#include "spinlock.h"
#include "proc.h"

int
sys_fork(void)
{
  return fork();
}

int sys_clone(void)
{
  void (*fn)(void*, void*);
  void *arg1, *arg2, *stack;
  int flags;

  if (argptr(0, (char **)&fn, 0) < 0)
    return -1;
  if (argptr(1, (char **)&arg1, 0) < 0)
    return -1;
  if (argptr(2, (char **)&arg2, 0) < 0)
    return -1;
  if (argint(3, (int *)&stack) < 0)
    return -1;
  if (argint(4, &flags) < 0)
    return -1;

  return clone(fn, arg1, arg2, stack, flags);
}

int
sys_exit(void)
{
  exit();
  return 0;  // not reached
}

int
sys_wait(void)
{
  return wait();
}

int
sys_join(void)
{
  int tid;
  if(argint(0, &tid) < 0)
    return -1;

  return join(tid);
}

int
sys_kill(void)
{
  int pid;

  if(argint(0, &pid) < 0)
    return -1;
  return kill(pid);
}

int
sys_tkill(void)
{
  int pid;

  if(argint(0, &pid) < 0)
    return -1;
  return tkill(pid);
}

int
sys_getpid(void)
{
  return myproc()->tgid;
}

int
sys_gettid(void)
{
  cprintf("inside gettid tid is %d\n", myproc()->pid);
  return myproc()->pid;
}

int
sys_sbrk(void)
{
  int addr;
  int n;

  if(argint(0, &n) < 0)
    return -1;
  addr = myproc()->sz;
  if(growproc(n) < 0)
    return -1;
  return addr;
}

int
sys_sleep(void)
{
  int n;
  uint ticks0;

  if(argint(0, &n) < 0)
    return -1;
  acquire(&tickslock);
  ticks0 = ticks;
  while(ticks - ticks0 < n){
    if(myproc()->killed){
      release(&tickslock);
      return -1;
    }
    sleep(&ticks, &tickslock);
  }
  release(&tickslock);
  return 0;
}

// return how many clock tick interrupts have occurred
// since start.
int
sys_uptime(void)
{
  uint xticks;

  acquire(&tickslock);
  xticks = ticks;
  release(&tickslock);
  return xticks;
}