72 lines
1.0 KiB
C
72 lines
1.0 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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uint64 sys_exit(void) {
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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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uint64 sys_getpid(void) { return myproc()->pid; }
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uint64 sys_fork(void) { return fork(); }
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uint64 sys_wait(void) {
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uint64 p;
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argaddr(0, &p);
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return wait(p);
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}
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uint64 sys_sbrk(void) {
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uint64 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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uint64 sys_sleep(void) {
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int n;
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uint 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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uint64 sys_kill(void) {
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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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uint64 sys_uptime(void) {
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uint 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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