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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Contains helper routines dealing with syncronous access to a non-blocking
* sokets.
*/
#include "qemu-common.h"
#include "errno.h"
#include "iolooper.h"
#include "sockets.h"
#include "android/utils/debug.h"
#include "android/sync-utils.h"
#include "android/utils/system.h"
#define D(...) do { if (VERBOSE_CHECK(init)) dprint(__VA_ARGS__); } while (0)
struct SyncSocket {
// Helper for performing synchronous I/O on the socket.
IoLooper* iolooper;
/* Opened socket handle. */
int fd;
};
SyncSocket*
syncsocket_init(int fd)
{
SyncSocket* sync_socket;
ANEW0(sync_socket);
socket_set_nonblock(fd);
sync_socket->iolooper = iolooper_new();
sync_socket->fd = fd;
return sync_socket;
}
SyncSocket*
syncsocket_connect(int fd, SockAddress* sockaddr, int timeout)
{
IoLooper* looper;
int connect_status;
SyncSocket* sync_socket = NULL;
socket_set_nonblock(fd);
for(;;) {
connect_status = socket_connect(fd, sockaddr);
if (connect_status >= 0) {
// Connected. Create IoLooper for the helper.
looper = iolooper_new();
break;
}
if (errno == EINPROGRESS || errno == EAGAIN || errno == EWOULDBLOCK) {
// Connection is in progress. Wait till it's finished.
looper = iolooper_new();
iolooper_add_write(looper, fd);
connect_status = iolooper_wait(looper, timeout);
if (connect_status > 0) {
iolooper_del_write(looper, fd);
break;
} else {
iolooper_free(looper);
return NULL;
}
} else if (errno != EINTR) {
return NULL;
}
}
// We're now connected. Lets initialize SyncSocket instance
// for this connection.
sync_socket = malloc(sizeof(SyncSocket));
if (sync_socket == NULL) {
derror("PANIC: not enough memory\n");
exit(1);
}
sync_socket->iolooper = looper;
sync_socket->fd = fd;
return sync_socket;
}
void
syncsocket_close(SyncSocket* ssocket)
{
if (ssocket != NULL && ssocket->fd >= 0) {
if (ssocket->iolooper != NULL) {
iolooper_reset(ssocket->iolooper);
}
socket_close(ssocket->fd);
ssocket->fd = -1;
}
}
void
syncsocket_free(SyncSocket* ssocket)
{
if (ssocket != NULL) {
if (ssocket->iolooper != NULL) {
iolooper_free(ssocket->iolooper);
}
free(ssocket);
}
}
int
syncsocket_start_read(SyncSocket* ssocket)
{
if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) {
errno = EINVAL;
return -1;
}
iolooper_add_read(ssocket->iolooper, ssocket->fd);
return 0;
}
int
syncsocket_stop_read(SyncSocket* ssocket)
{
if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) {
errno = EINVAL;
return -1;
}
iolooper_del_read(ssocket->iolooper, ssocket->fd);
return 0;
}
int
syncsocket_start_write(SyncSocket* ssocket)
{
if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) {
errno = EINVAL;
return -1;
}
iolooper_add_write(ssocket->iolooper, ssocket->fd);
return 0;
}
int
syncsocket_stop_write(SyncSocket* ssocket)
{
if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) {
errno = EINVAL;
return -1;
}
iolooper_del_write(ssocket->iolooper, ssocket->fd);
return 0;
}
ssize_t
syncsocket_read_absolute(SyncSocket* ssocket,
void* buf,
size_t size,
int64_t deadline)
{
int ret;
if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) {
errno = EINVAL;
return -1;
}
ret = iolooper_wait_absolute(ssocket->iolooper, deadline);
if (ret > 0) {
if (!iolooper_is_read(ssocket->iolooper, ssocket->fd)) {
D("%s: Internal error, iolooper_is_read() not set!", __FUNCTION__);
return -1;
}
do {
ret = socket_recv(ssocket->fd, buf, size);
} while( ret < 0 && errno == EINTR);
} else if (ret == 0) {
// Timed out
errno = ETIMEDOUT;
ret = -1;
}
return ret;
}
ssize_t
syncsocket_read(SyncSocket* ssocket, void* buf, size_t size, int timeout)
{
return syncsocket_read_absolute(ssocket, buf, size, iolooper_now() + timeout);
}
ssize_t
syncsocket_write_absolute(SyncSocket* ssocket,
const void* buf,
size_t size,
int64_t deadline)
{
int ret;
size_t written = 0;
if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) {
errno = EINVAL;
return -1;
}
do {
ret = iolooper_wait_absolute(ssocket->iolooper, deadline);
if (ret < 0) {
return ret;
} else if (ret == 0) {
// Timeout.
errno = ETIMEDOUT;
return -1;
}
if (!iolooper_is_write(ssocket->iolooper, ssocket->fd)) {
D("%s: Internal error, iolooper_is_write() not set!", __FUNCTION__);
return -1;
}
do {
ret = socket_send(ssocket->fd, (const char*)buf + written, size - written);
} while( ret < 0 && errno == EINTR);
if (ret > 0) {
written += ret;
} else if (ret < 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
return -1;
}
} else {
// Disconnected.
errno = ECONNRESET;
return -1;
}
} while (written < size);
return (int)written;
}
ssize_t
syncsocket_write(SyncSocket* ssocket, const void* buf, size_t size, int timeout)
{
return syncsocket_write_absolute(ssocket, buf, size, iolooper_now() + timeout);
}
ssize_t
syncsocket_read_line_absolute(SyncSocket* ssocket,
char* buffer,
size_t size,
int64_t deadline)
{
size_t read_chars = 0;
while (read_chars < size) {
char ch;
int ret = syncsocket_read_absolute(ssocket, &ch, 1, deadline);
if (ret <= 0) {
return ret;
}
buffer[read_chars++] = ch;
if (ch == '\n') {
return read_chars;
}
}
/* Not enough room in the input buffer!*/
errno = ENOMEM;
return -1;
}
ssize_t
syncsocket_read_line(SyncSocket* ssocket, char* buffer, size_t size, int timeout)
{
return syncsocket_read_line_absolute(ssocket, buffer, size,
iolooper_now() + timeout);
}
int
syncsocket_get_socket(SyncSocket* ssocket)
{
return (ssocket != NULL) ? ssocket->fd : -1;
}