105 lines
1.2 KiB
C
105 lines
1.2 KiB
C
#include "types.h"
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#include "riscv.h"
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#include "defs.h"
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#include "param.h"
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#include "memlayout.h"
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#include "spinlock.h"
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#include "proc.h"
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u64
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sys_exit(void)
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{
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int n;
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argint(0, &n);
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exit(n);
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return 0; // not reached
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}
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u64
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sys_getpid(void)
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{
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return myproc()->pid;
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}
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u64
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sys_fork(void)
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{
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return fork();
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}
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u64
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sys_wait(void)
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{
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u64 p;
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argaddr(0, &p);
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return wait(p);
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}
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u64
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sys_sbrk(void)
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{
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u64 addr;
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int n;
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argint(0, &n);
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addr = myproc()->sz;
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if(growproc(n) < 0)
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return -1;
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return addr;
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}
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u64
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sys_sleep(void)
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{
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int n;
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u32 ticks0;
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argint(0, &n);
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acquire(&tickslock);
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ticks0 = ticks;
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while(ticks - ticks0 < n) {
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if(killed(myproc())) {
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release(&tickslock);
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return -1;
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}
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sleep(&ticks, &tickslock);
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}
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release(&tickslock);
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return 0;
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}
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u64
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sys_kill(void)
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{
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int pid;
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argint(0, &pid);
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return kill(pid);
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}
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// return how many clock tick interrupts have occurred
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// since start.
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u64
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sys_uptime(void)
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{
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u32 xticks;
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acquire(&tickslock);
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xticks = ticks;
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release(&tickslock);
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return xticks;
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}
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u64
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sys_trace(void)
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{
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/* TODO: Implement sys_trace */
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return 0;
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}
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void
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sys_halt(void)
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{
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(*(volatile u32 *)QEMU_POWER) = 0x5555;
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panic("sys_poweroff");
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}
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