1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "nacl_io/kernel_handle.h"
10 #include "nacl_io/filesystem.h"
11 #include "nacl_io/node.h"
12 #include "nacl_io/osunistd.h"
13 #include "nacl_io/socket/socket_node.h"
15 #include "sdk_util/auto_lock.h"
19 // It is only legal to construct a handle while the kernel lock is held.
20 KernelHandle::KernelHandle() : filesystem_(NULL), node_(NULL) {
23 KernelHandle::KernelHandle(const ScopedFilesystem& fs, const ScopedNode& node)
24 : filesystem_(fs), node_(node) {
27 KernelHandle::~KernelHandle() {
28 // Force release order for cases where filesystem_ is not ref'd by mounting.
30 filesystem_.reset(NULL);
33 // Returns the SocketNode* if this node is a socket.
34 SocketNode* KernelHandle::socket_node() {
35 if (node_.get() && node_->IsaSock())
36 return reinterpret_cast<SocketNode*>(node_.get());
40 Error KernelHandle::Init(int open_flags) {
41 handle_attr_.flags = open_flags;
43 if (!node_->CanOpen(open_flags)) {
47 if (open_flags & O_APPEND) {
48 Error error = node_->GetSize(&handle_attr_.offs);
56 Error KernelHandle::Seek(off_t offset, int whence, off_t* out_offset) {
57 // By default, don't move the offset.
62 AUTO_LOCK(handle_lock_);
63 Error error = node_->GetSize(&node_size);
72 base = handle_attr_.offs;
81 if (base + offset < 0)
84 off_t new_offset = base + offset;
86 // Seeking past the end of the file will zero out the space between the old
87 // end and the new end.
88 if (new_offset > node_size) {
89 error = node_->FTruncate(new_offset);
94 *out_offset = handle_attr_.offs = new_offset;
98 Error KernelHandle::Read(void* buf, size_t nbytes, int* cnt) {
99 AUTO_LOCK(handle_lock_);
100 if (OpenMode() == O_WRONLY)
102 Error error = node_->Read(handle_attr_, buf, nbytes, cnt);
104 handle_attr_.offs += *cnt;
108 Error KernelHandle::Write(const void* buf, size_t nbytes, int* cnt) {
109 AUTO_LOCK(handle_lock_);
110 if (OpenMode() == O_RDONLY)
112 Error error = node_->Write(handle_attr_, buf, nbytes, cnt);
114 handle_attr_.offs += *cnt;
118 Error KernelHandle::GetDents(struct dirent* pdir, size_t nbytes, int* cnt) {
119 AUTO_LOCK(handle_lock_);
120 Error error = node_->GetDents(handle_attr_.offs, pdir, nbytes, cnt);
122 handle_attr_.offs += *cnt;
126 Error KernelHandle::Fcntl(int request, int* result, ...) {
128 va_start(ap, result);
129 Error rtn = VFcntl(request, result, ap);
134 Error KernelHandle::VFcntl(int request, int* result, va_list args) {
137 *result = handle_attr_.flags;
141 AUTO_LOCK(handle_lock_);
142 int flags = va_arg(args, int);
143 if (!(flags & O_APPEND) && (handle_attr_.flags & O_APPEND)) {
144 // Attempt to clear O_APPEND.
147 // Only certain flags are mutable
148 const int mutable_flags = O_ASYNC | O_NONBLOCK;
149 flags &= mutable_flags;
150 handle_attr_.flags &= ~mutable_flags;
151 handle_attr_.flags |= flags;
158 Error KernelHandle::Accept(PP_Resource* new_sock,
159 struct sockaddr* addr,
161 SocketNode* sock = socket_node();
165 AUTO_LOCK(handle_lock_);
166 return sock->Accept(handle_attr_, new_sock, addr, len);
169 Error KernelHandle::Connect(const struct sockaddr* addr, socklen_t len) {
170 SocketNode* sock = socket_node();
174 AUTO_LOCK(handle_lock_);
175 return sock->Connect(handle_attr_, addr, len);
178 Error KernelHandle::Recv(void* buf, size_t len, int flags, int* out_len) {
179 SocketNode* sock = socket_node();
182 if (OpenMode() == O_WRONLY)
185 AUTO_LOCK(handle_lock_);
186 return sock->Recv(handle_attr_, buf, len, flags, out_len);
189 Error KernelHandle::RecvFrom(void* buf,
192 struct sockaddr* src_addr,
195 SocketNode* sock = socket_node();
198 if (OpenMode() == O_WRONLY)
201 AUTO_LOCK(handle_lock_);
202 return sock->RecvFrom(handle_attr_, buf, len, flags, src_addr, addrlen,
206 Error KernelHandle::Send(const void* buf, size_t len, int flags, int* out_len) {
207 SocketNode* sock = socket_node();
210 if (OpenMode() == O_RDONLY)
213 AUTO_LOCK(handle_lock_);
214 return sock->Send(handle_attr_, buf, len, flags, out_len);
217 Error KernelHandle::SendTo(const void* buf,
220 const struct sockaddr* dest_addr,
223 SocketNode* sock = socket_node();
226 if (OpenMode() == O_RDONLY)
229 AUTO_LOCK(handle_lock_);
230 return sock->SendTo(handle_attr_, buf, len, flags, dest_addr, addrlen,
234 } // namespace nacl_io