xv6-cs450/sysproc.c

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#include "types.h"
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#include "x86.h"
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#include "defs.h"
#include "param.h"
#include "memlayout.h"
#include "mmu.h"
#include "proc.h"
int
sys_fork(void)
{
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return fork();
}
int
sys_exit(void)
{
exit();
return 0; // not reached
}
int
sys_wait(void)
{
return wait();
}
int
sys_kill(void)
{
int pid;
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if(argint(0, &pid) < 0)
return -1;
return kill(pid);
}
int
sys_getpid(void)
{
return proc->pid;
}
int
sys_sbrk(void)
{
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int addr;
int n;
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if(argint(0, &n) < 0)
return -1;
addr = proc->sz;
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if(growproc(n) < 0)
return -1;
return addr;
}
int
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sys_sleep(void)
{
int n;
uint ticks0;
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if(argint(0, &n) < 0)
return -1;
acquire(&tickslock);
ticks0 = ticks;
while(ticks - ticks0 < n){
if(proc->killed){
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release(&tickslock);
return -1;
}
sleep(&ticks, &tickslock);
}
release(&tickslock);
return 0;
}
// return how many clock tick interrupts have occurred
// since boot.
int
sys_uptime(void)
{
uint xticks;
acquire(&tickslock);
xticks = ticks;
release(&tickslock);
return xticks;
}