xv6-cs450/sysproc.c
2009-05-31 00:38:51 +00:00

75 lines
841 B
C

#include "types.h"
#include "x86.h"
#include "defs.h"
#include "param.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 cp->pid;
}
int
sys_sbrk(void)
{
int addr;
int n;
if(argint(0, &n) < 0)
return -1;
addr = cp->sz;
if(growproc(n) < 0)
return -1;
return addr;
}
int
sys_sleep(void)
{
int n, ticks0;
if(argint(0, &n) < 0)
return -1;
acquire(&tickslock);
ticks0 = ticks;
while(ticks - ticks0 < n){
if(cp->killed){
release(&tickslock);
return -1;
}
sleep(&ticks, &tickslock);
}
release(&tickslock);
return 0;
}