80 lines
1.2 KiB
C
80 lines
1.2 KiB
C
#include "types.h"
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#include "x86.h"
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#include "defs.h"
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#include "date.h"
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#include "param.h"
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#include "memlayout.h"
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#include "mmu.h"
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#include "proc.h"
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int sys_fork(void) {
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return fork();
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}
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int sys_exit(void) {
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exit();
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return 0; // not reached
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}
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int sys_wait(void) {
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return wait();
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}
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int sys_kill(void) {
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int pid;
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if (argint(0, &pid) < 0) {
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return -1;
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}
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return kill(pid);
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}
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int sys_getpid(void) {
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return myproc()->pid;
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}
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int sys_sbrk(void) {
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int addr;
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int n;
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if (argint(0, &n) < 0) {
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return -1;
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}
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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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}
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return addr;
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}
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int sys_sleep(void) {
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int n;
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uint ticks0;
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if (argint(0, &n) < 0) {
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return -1;
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}
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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 (myproc()->killed) {
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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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// return how many clock tick interrupts have occurred
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// since start.
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int 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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