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;
}
int
sys_signal(void){
  int signum;
  sighandler_t handler;
  if(argint(0, &signum) < 0)
    return -1;
  if(argint(1, (int*)&handler) < 0)
    return -1;
  return (int)(signal(signum,(sighandler_t)handler));
}

int
sys_sigsend(void)
{
  int pid,signum;
  if ((argint(0, &pid) < 0) || (argint(1, &signum) < 0))
    return -1;
  return sigsend(pid,signum);
}

int
sys_sigreturn(void){
  return sigreturn();
}

int
sys_alarm(void){
  int al;
    if (argint(0, &al) < 0)
    return -1;
return alarm(al);
}