CS471/571 - Operating Systems

Displaying ./code/xv6-public/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 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 || myproc()->sigpending){
      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;
}

int
sys_getrtc(void)
{
  struct rtcdate *t;

  if(argptr(0, (char **)&t, sizeof(struct rtcdate)) < 0)
    return -1;

  cmostime(t);
  return 0;
}

int
sys_setpgid(void)
{
  int pgid;
  if (argint(0, &pgid) < 0) return -1;
  if (pgid < 0) return -1;
  myproc()->pgid = pgid;
  return 0;
}

extern int cpgrp;

int
sys_tcsetpgrp(void)
{
  int cp;
  if (argint(0, &cp) < 0) return -1;
  if (cp < 0) return -1;
  cpgrp = cp;
  return 0;
}

int
sys_setpriority(void)
{
  int pid, priority;

  if (argint(0, &pid) < 0) return -1;
  if (argint(1, &priority) < 0) return -1;
  if (priority < -10 || priority > 10) return -1;
  return setpriority(pid, priority);
}