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/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "nacl_io/mount_node.h"
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <string>
#include "nacl_io/kernel_wrap_real.h"
#include "nacl_io/mount.h"
#include "nacl_io/osmman.h"
#include "utils/auto_lock.h"
static const int USR_ID = 1001;
static const int GRP_ID = 1002;
MountNode::MountNode(Mount* mount)
: mount_(mount) {
memset(&stat_, 0, sizeof(stat_));
stat_.st_gid = GRP_ID;
stat_.st_uid = USR_ID;
// Mount should normally never be NULL, but may be null in tests.
if (mount_)
mount_->OnNodeCreated(this);
}
MountNode::~MountNode() {
}
bool MountNode::Init(int perm) {
stat_.st_mode |= perm;
return true;
}
void MountNode::Destroy() {
if (mount_) {
mount_->OnNodeDestroyed(this);
}
}
int MountNode::FSync() {
return 0;
}
int MountNode::GetDents(size_t offs, struct dirent* pdir, size_t count) {
errno = ENOTDIR;
return -1;
}
int MountNode::GetStat(struct stat* pstat) {
AutoLock lock(&lock_);
memcpy(pstat, &stat_, sizeof(stat_));
return 0;
}
int MountNode::Ioctl(int request, char* arg) {
errno = EINVAL;
return -1;
}
int MountNode::Read(size_t offs, void* buf, size_t count) {
errno = EINVAL;
return -1;
}
int MountNode::Truncate(size_t size) {
errno = EINVAL;
return -1;
}
int MountNode::Write(size_t offs, const void* buf, size_t count) {
errno = EINVAL;
return -1;
}
void* MountNode::MMap(void* addr, size_t length, int prot, int flags,
size_t offset) {
// Never allow mmap'ing PROT_EXEC. The passthrough node supports this, but we
// don't. Fortunately, glibc will fallback if this fails, so dlopen will
// continue to work.
if (prot & PROT_EXEC) {
errno = EPERM;
return MAP_FAILED;
}
// This default mmap support is just enough to make dlopen work.
// This implementation just reads from the mount into the mmap'd memory area.
void* new_addr = addr;
int err = _real_mmap(&new_addr, length, prot | PROT_WRITE, flags |
MAP_ANONYMOUS, -1, 0);
if (new_addr == MAP_FAILED) {
_real_munmap(new_addr, length);
errno = err;
return MAP_FAILED;
}
ssize_t cnt = Read(offset, new_addr, length);
if (cnt == -1) {
_real_munmap(new_addr, length);
errno = ENOSYS;
return MAP_FAILED;
}
return new_addr;
}
int MountNode::Munmap(void* addr, size_t length) {
return _real_munmap(addr, length);
}
int MountNode::GetLinks() {
return stat_.st_nlink;
}
int MountNode::GetMode() {
return stat_.st_mode & ~S_IFMT;
}
size_t MountNode::GetSize() {
return stat_.st_size;
}
int MountNode::GetType() {
return stat_.st_mode & S_IFMT;
}
bool MountNode::IsaDir() {
return (stat_.st_mode & S_IFDIR) != 0;
}
bool MountNode::IsaFile() {
return (stat_.st_mode & S_IFREG) != 0;
}
bool MountNode::IsaTTY() {
return (stat_.st_mode & S_IFCHR) != 0;
}
int MountNode:: AddChild(const std::string& name, MountNode* node) {
errno = ENOTDIR;
return -1;
}
int MountNode::RemoveChild(const std::string& name) {
errno = ENOTDIR;
return -1;
}
MountNode* MountNode::FindChild(const std::string& name) {
errno = ENOTDIR;
return NULL;
}
int MountNode::ChildCount() {
errno = ENOTDIR;
return -1;
}
void MountNode::Link() {
Acquire();
stat_.st_nlink++;
}
void MountNode::Unlink() {
stat_.st_nlink--;
Release();
}
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