sysproc.c

#include "types.h"
#include "x86.h"
#include "defs.h"
#include "date.h"
#include "param.h"
#include "memlayout.h"
#include "mmu.h"
#include "proc.h"

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

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

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

int
sys_kill(void)
{
  int pid;

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

int
sys_getpid(void)
{
  return proc->pid;
}

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

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

extern int sched_trace_enabled;
int sys_enable_sched_trace(void)
{
  if (argint(0, &sched_trace_enabled) < 0)
  {
    cprintf("enable_sched_trace() failed!\n");
  }

  return 0;
}
int sys_shutdown(void)
{
  /* Either of the following will work. Does not harm to put them together. */
  outw(0xB004, 0x0|0x2000); // working for old qemu
  outw(0x604, 0x0|0x2000); // working for newer qemu

  return 0;
}

int sys_setpriority(void){
int priority;
int pid;
	if(argint(0, &pid)<0){
		return 1;
	}
	if(argint(1, &priority)<0){
		return 1;
	}
	//cprintf("priority : %d\n",priority);
	
return setpriority(pid,priority);
}

int sys_setrunningticks(void){
  int RUNNING_THRESHOLD;
	if(argint(0, &RUNNING_THRESHOLD)<0){
		return 1;
	}
  
	//cprintf("RUNNING_THRESHOLD : %d\n",RUNNING_THRESHOLD);
	return setrunningticks(RUNNING_THRESHOLD);
}

int sys_setwaitingticks(void){

  int WAITING_THRESHOLD;
	if(argint(0, &WAITING_THRESHOLD)<0){
		return 1;
	}
  
	//cprintf("WAITING_THRESHOLD : %d\n",WAITING_THRESHOLD);
	return setwaitingticks(WAITING_THRESHOLD);
}