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sysproc.c
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sysproc.c
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#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;
}
// Halt (shutdown) the system by sending a special
// signal to QEMU.
// Based on: http://pdos.csail.mit.edu/6.828/2012/homework/xv6-syscall.html
// and: https://github.com/t3rm1n4l/pintos/blob/master/devices/shutdown.c
int
sys_halt(void)
{
char *p = "Shutdown";
for( ; *p; p++)
outw(0xB004, 0x2000);
return 0;
}