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my solution to lab5

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winPond
2019-07-11 19:40:12 +08:00
parent 1f043fb694
commit f78713349c
364 changed files with 8775 additions and 3249 deletions
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7
lab/lib/fork.c
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@@ -74,8 +74,11 @@ duppage(envid_t envid, unsigned pn)
// 用户空间的地址较低
uint32_t va = pn * PGSIZE;
if ( (uvpt[pn] & PTE_W) || (uvpt[pn] & PTE_COW)) {
if (uvpt[pn] & PTE_SHARE) {
if((ret = sys_page_map(thisenv->env_id, (void *) va, envid, (void * )va, uvpt[pn] & PTE_SYSCALL)) <0 )
return ret;
}
else if ( (uvpt[pn] & PTE_W) || (uvpt[pn] & PTE_COW)) {
// 子进程标记
if ((ret = sys_page_map(thisenv->env_id, (void *) va, envid, (void *) va, PTE_P|PTE_U|PTE_COW)) < 0)