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hardware_samsung/ril/libsecril-client-sap/secril-client-sap.cpp

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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.
*/
#define LOG_TAG "SapClient"
#include <binder/Parcel.h>
#include <telephony/ril.h>
#include <cutils/record_stream.h>
#include <unistd.h>
#include <errno.h>
#include <cutils/sockets.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <string.h>
#include <fcntl.h>
#include <utils/Log.h>
#include <pthread.h>
#include "secril-client-sap.h"
#include <hardware_legacy/power.h> // For wakelock
#define RIL_CLIENT_WAKE_LOCK "client-sap-interface"
namespace android {
//---------------------------------------------------------------------------
// Defines
//---------------------------------------------------------------------------
#define DBG 0
#define MULTI_CLIENT_SOCKET_NAME "Multiclient"
#define MAX_COMMAND_BYTES (8 * 1024)
#define REQ_POOL_SIZE 32
#define TOKEN_POOL_SIZE 32
// Constants for response types
#define RESPONSE_SOLICITED 0
#define RESPONSE_UNSOLICITED 1
#define max(a, b) ((a) > (b) ? (a) : (b))
#define REQ_OEM_HOOK_RAW RIL_REQUEST_OEM_HOOK_RAW
//---------------------------------------------------------------------------
// Type definitions
//---------------------------------------------------------------------------
typedef struct _ReqHistory {
int token; // token used for request
uint32_t id; // request ID
} ReqHistory;
typedef struct _ReqRespHandler {
uint32_t id; // request ID
RilOnComplete handler; // handler function
} ReqRespHandler;
typedef struct _UnsolHandler {
uint32_t id; // unsolicited response ID
RilOnUnsolicited handler; // handler function
} UnsolHandler;
typedef struct _RilClientPrv {
HRilClient parent;
uint8_t b_connect; // connected to server?
int sock; // socket
int pipefd[2];
fd_set sock_rfds; // for read with select()
RecordStream *p_rs;
uint32_t token_pool; // each bit in token_pool used for token.
// so, pool size is 32.
pthread_t tid_reader; // socket reader thread id
ReqHistory history[TOKEN_POOL_SIZE]; // request history
ReqRespHandler req_handlers[REQ_POOL_SIZE]; // request response handler list
UnsolHandler unsol_handlers[REQ_POOL_SIZE]; // unsolicited response handler list
RilOnError err_cb; // error callback
void *err_cb_data; // error callback data
uint8_t b_del_handler;
} RilClientPrv;
//---------------------------------------------------------------------------
// Local static function prototypes
//---------------------------------------------------------------------------
static void * RxReaderFunc(void *param);
static int processRxBuffer(RilClientPrv *prv, void *buffer, size_t buflen);
static uint32_t AllocateToken(uint32_t *token_pool);
static void FreeToken(uint32_t *token_pool, uint32_t token);
static uint8_t IsValidToken(uint32_t *token_pool, uint32_t token);
static int blockingWrite(int fd, const void *buffer, size_t len);
static int RecordReqHistory(RilClientPrv *prv, int token, uint32_t id);
static void ClearReqHistory(RilClientPrv *prv, int token);
static RilOnComplete FindReqHandler(RilClientPrv *prv, int token, uint32_t *id);
static RilOnUnsolicited FindUnsolHandler(RilClientPrv *prv, uint32_t id);
static int SendOemRequestHookRaw(HRilClient client, int req_id, char *data, size_t len);
/**
* @fn int RegisterUnsolicitedHandler(HRilClient client, uint32_t id, RilOnUnsolicited handler)
*
* @params client: Client handle.
* id: Unsolicited response ID to which handler is registered.
* handler: Unsolicited handler. NULL for deregistration.
*
* @return 0 on success or error code.
*/
extern "C"
int RegisterUnsolicitedHandler(HRilClient client, uint32_t id, RilOnUnsolicited handler) {
RilClientPrv *client_prv;
int match_slot = -1;
int first_empty_slot = -1;
int i;
if (client == NULL || client->prv == NULL)
return RIL_CLIENT_ERR_INVAL;
client_prv = (RilClientPrv *)(client->prv);
for (i = 0; i < REQ_POOL_SIZE; i++) {
// Check if there is matched handler.
if (id == client_prv->unsol_handlers[i].id) {
match_slot = i;
}
// Find first empty handler slot.
if (first_empty_slot == -1 && client_prv->unsol_handlers[i].id == 0) {
first_empty_slot = i;
}
}
if (handler == NULL) { // Unregister.
if (match_slot >= 0) {
memset(&(client_prv->unsol_handlers[match_slot]), 0, sizeof(UnsolHandler));
return RIL_CLIENT_ERR_SUCCESS;
}
else {
return RIL_CLIENT_ERR_SUCCESS;
}
}
else {// Register.
if (match_slot >= 0) {
client_prv->unsol_handlers[match_slot].handler = handler; // Just update.
}
else if (first_empty_slot >= 0) {
client_prv->unsol_handlers[first_empty_slot].id = id;
client_prv->unsol_handlers[first_empty_slot].handler = handler;
}
else {
return RIL_CLIENT_ERR_RESOURCE;
}
}
return RIL_CLIENT_ERR_SUCCESS;
}
/**
* @fn int RegisterRequestCompleteHandler(HRilClient client, uint32_t id, RilOnComplete handler)
*
* @params client: Client handle.
* id: Request ID to which handler is registered.
* handler: Request complete handler. NULL for deregistration.
*
* @return 0 on success or error code.
*/
extern "C"
int RegisterRequestCompleteHandler(HRilClient client, uint32_t id, RilOnComplete handler) {
RilClientPrv *client_prv;
int match_slot = -1;
int first_empty_slot = -1;
int i;
if (client == NULL || client->prv == NULL)
return RIL_CLIENT_ERR_INVAL;
client_prv = (RilClientPrv *)(client->prv);
for (i = 0; i < REQ_POOL_SIZE; i++) {
// Check if there is matched handler.
if (id == client_prv->req_handlers[i].id) {
match_slot = i;
}
// Find first empty handler slot.
if (first_empty_slot == -1 && client_prv->req_handlers[i].id == 0) {
first_empty_slot = i;
}
}
if (handler == NULL) { // Unregister.
if (match_slot >= 0) {
memset(&(client_prv->req_handlers[match_slot]), 0, sizeof(ReqRespHandler));
return RIL_CLIENT_ERR_SUCCESS;
}
else {
return RIL_CLIENT_ERR_SUCCESS;
}
}
else { // Register.
if (match_slot >= 0) {
client_prv->req_handlers[match_slot].handler = handler; // Just update.
}
else if (first_empty_slot >= 0) {
client_prv->req_handlers[first_empty_slot].id = id;
client_prv->req_handlers[first_empty_slot].handler = handler;
}
else {
return RIL_CLIENT_ERR_RESOURCE;
}
}
return RIL_CLIENT_ERR_SUCCESS;
}
/**
* @fn int RegisterErrorCallback(HRilClient client, RilOnError cb, void *data)
*
* @params client: Client handle.
* cb: Error callback. NULL for unregistration.
* data: Callback data.
*
* @return 0 for success or error code.
*/
extern "C"
int RegisterErrorCallback(HRilClient client, RilOnError cb, void *data) {
RilClientPrv *client_prv;
if (client == NULL || client->prv == NULL)
return RIL_CLIENT_ERR_INVAL;
client_prv = (RilClientPrv *)(client->prv);
client_prv->err_cb = cb;
client_prv->err_cb_data = data;
return RIL_CLIENT_ERR_SUCCESS;
}
/**
* @fn HRilClient OpenClient_RILD(void)
*
* @params None.
*
* @return Client handle, NULL on error.
*/
extern "C"
HRilClient OpenClient_RILD(void) {
HRilClient client = (HRilClient)malloc(sizeof(struct RilClient));
if (client == NULL)
return NULL;
client->prv = (RilClientPrv *)malloc(sizeof(RilClientPrv));
if (client->prv == NULL) {
free(client);
return NULL;
}
memset(client->prv, 0, sizeof(RilClientPrv));
((RilClientPrv *)(client->prv))->parent = client;
((RilClientPrv *)(client->prv))->sock = -1;
return client;
}
/**
* @fn int Connect_RILD(void)
*
* @params client: Client handle.
*
* @return 0, or error code.
*/
extern "C"
int Connect_RILD(HRilClient client) {
RilClientPrv *client_prv;
if (client == NULL || client->prv == NULL) {
ALOGE("%s: Invalid client %p", __FUNCTION__, client);
return RIL_CLIENT_ERR_INVAL;
}
client_prv = (RilClientPrv *)(client->prv);
// Open client socket and connect to server.
client_prv->sock = socket_local_client(MULTI_CLIENT_SOCKET_NAME, ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM );
if (client_prv->sock < 0) {
ALOGE("%s: Connecting failed. %s(%d)", __FUNCTION__, strerror(errno), errno);
return RIL_CLIENT_ERR_CONNECT;
}
client_prv->b_connect = 1;
if (fcntl(client_prv->sock, F_SETFL, O_NONBLOCK) < 0) {
close(client_prv->sock);
return RIL_CLIENT_ERR_IO;
}
client_prv->p_rs = record_stream_new(client_prv->sock, MAX_COMMAND_BYTES);
if (pipe(client_prv->pipefd) < 0) {
close(client_prv->sock);
ALOGE("%s: Creating command pipe failed. %s(%d)", __FUNCTION__, strerror(errno), errno);
return RIL_CLIENT_ERR_IO;
}
if (fcntl(client_prv->pipefd[0], F_SETFL, O_NONBLOCK) < 0) {
close(client_prv->sock);
close(client_prv->pipefd[0]);
close(client_prv->pipefd[1]);
return RIL_CLIENT_ERR_IO;
}
// Start socket read thread.
if (pthread_create(&(client_prv->tid_reader), NULL, RxReaderFunc, (void *)client_prv) != 0) {
close(client_prv->sock);
close(client_prv->pipefd[0]);
close(client_prv->pipefd[1]);
memset(client_prv, 0, sizeof(RilClientPrv));
client_prv->sock = -1;
ALOGE("%s: Can't create Reader thread. %s(%d)", __FUNCTION__, strerror(errno), errno);
return RIL_CLIENT_ERR_CONNECT;
}
return RIL_CLIENT_ERR_SUCCESS;
}
/**
* @fn int Disconnect_RILD(HRilClient client)
*
* @params client: Client handle.
*
* @return 0 on success, or error code.
*/
extern "C"
int Disconnect_RILD(HRilClient client) {
RilClientPrv *client_prv;
int ret = 0;
if (client == NULL || client->prv == NULL) {
ALOGE("%s: invalid client %p", __FUNCTION__, client);
return RIL_CLIENT_ERR_INVAL;
}
client_prv = (RilClientPrv *)(client->prv);
if (client_prv->sock == -1)
return RIL_CLIENT_ERR_SUCCESS;
ALOGD("[*] %s(): sock=%d\n", __FUNCTION__, client_prv->sock);
if (client_prv->sock > 0) {
do {
ret = write(client_prv->pipefd[1], "close", strlen("close"));
} while (ret < 0 && errno == EINTR);
}
client_prv->b_connect = 0;
pthread_join(client_prv->tid_reader, NULL);
return RIL_CLIENT_ERR_SUCCESS;
}
/**
* @fn int CloseClient_RILD(HRilClient client)
*
* @params client: Client handle.
*
* @return 0 on success, or error code.
*/
extern "C"
int CloseClient_RILD(HRilClient client) {
if (client == NULL || client->prv == NULL) {
ALOGE("%s: invalid client %p", __FUNCTION__, client);
return RIL_CLIENT_ERR_INVAL;
}
Disconnect_RILD(client);
free(client->prv);
free(client);
return RIL_CLIENT_ERR_SUCCESS;
}
/**
* @fn int InvokeOemRequestHookRaw(HRilClient client, char *data, size_t len)
*
* @params client: Client handle.
* data: Request data.
* len: Request data length.
*
* @return 0 for success or error code. On receiving RIL_CLIENT_ERR_AGAIN,
* caller should retry.
*/
extern "C"
int InvokeOemRequestHookRaw(HRilClient client, char *data, size_t len) {
RilClientPrv *client_prv;
if (client == NULL || client->prv == NULL) {
ALOGE("%s: Invalid client %p", __FUNCTION__, client);
return RIL_CLIENT_ERR_INVAL;
}
client_prv = (RilClientPrv *)(client->prv);
if (client_prv->sock < 0 ) {
ALOGE("%s: Not connected.", __FUNCTION__);
return RIL_CLIENT_ERR_CONNECT;
}
return SendOemRequestHookRaw(client, REQ_OEM_HOOK_RAW, data, len);
}
static int SendOemRequestHookRaw(HRilClient client, int req_id, char *data, size_t len) {
int token = 0;
int ret = 0;
uint32_t header = 0;
android::Parcel p;
RilClientPrv *client_prv;
int maxfd = -1;
client_prv = (RilClientPrv *)(client->prv);
// Allocate a token.
token = AllocateToken(&(client_prv->token_pool));
if (token == 0) {
ALOGE("%s: No token.", __FUNCTION__);
return RIL_CLIENT_ERR_AGAIN;
}
// Record token for the request sent.
if (RecordReqHistory(client_prv, token, req_id) != RIL_CLIENT_ERR_SUCCESS) {
goto error;
}
// Make OEM request data.
p.writeInt32(RIL_REQUEST_OEM_HOOK_RAW);
p.writeInt32(token);
p.writeInt32(len);
p.write((void *)data, len);
// DO TX: header(size).
header = htonl(p.dataSize());
if (DBG) ALOGD("%s(): token = %d\n", __FUNCTION__, token);
ret = blockingWrite(client_prv->sock, (void *)&header, sizeof(header));
if (ret < 0) {
ALOGE("%s: send request header failed. (%d)", __FUNCTION__, ret);
goto error;
}
// Do TX: response data.
ret = blockingWrite(client_prv->sock, p.data(), p.dataSize());
if (ret < 0) {
ALOGE("%s: send request data failed. (%d)", __FUNCTION__, ret);
goto error;
}
return RIL_CLIENT_ERR_SUCCESS;
error:
FreeToken(&(client_prv->token_pool), token);
ClearReqHistory(client_prv, token);
return RIL_CLIENT_ERR_UNKNOWN;
}
static void * RxReaderFunc(void *param) {
RilClientPrv *client_prv = (RilClientPrv *)param;
int maxfd = 0;
int token = 0;
void *p_record = NULL;
size_t recordlen = 0;
int ret = 0;
int n;
if (client_prv == NULL)
return NULL;
maxfd = max(client_prv->sock, client_prv->pipefd[0]) + 1;
ALOGD("[*] %s() b_connect=%d, maxfd=%d\n", __FUNCTION__, client_prv->b_connect, maxfd);
while (client_prv->b_connect) {
FD_ZERO(&(client_prv->sock_rfds));
FD_SET(client_prv->sock, &(client_prv->sock_rfds));
FD_SET(client_prv->pipefd[0], &(client_prv->sock_rfds));
if (DBG) ALOGD("[*] %s() b_connect=%d\n", __FUNCTION__, client_prv->b_connect);
if (select(maxfd, &(client_prv->sock_rfds), NULL, NULL, NULL) > 0) {
if (FD_ISSET(client_prv->sock, &(client_prv->sock_rfds))) {
// Read incoming data
for (;;) {
// loop until EAGAIN/EINTR, end of stream, or other error
ret = record_stream_get_next(client_prv->p_rs, &p_record, &recordlen);
if (ret == 0 && p_record == NULL) { // end-of-stream
break;
}
else if (ret < 0) {
break;
}
else if (ret == 0) { // && p_record != NULL
n = processRxBuffer(client_prv, p_record, recordlen);
if (n != RIL_CLIENT_ERR_SUCCESS) {
ALOGE("%s: processRXBuffer returns %d", __FUNCTION__, n);
}
}
else {
ALOGD("[*] %s()\n", __FUNCTION__);
}
}
if (ret == 0 || !(errno == EAGAIN || errno == EINTR)) {
// fatal error or end-of-stream
if (client_prv->sock > 0) {
close(client_prv->sock);
client_prv->sock = -1;
client_prv->b_connect = 0;
}
if (client_prv->p_rs)
record_stream_free(client_prv->p_rs);
// EOS
if (client_prv->err_cb) {
client_prv->err_cb(client_prv->err_cb_data, RIL_CLIENT_ERR_CONNECT);
return NULL;
}
break;
}
}
if (FD_ISSET(client_prv->pipefd[0], &(client_prv->sock_rfds))) {
char end_cmd[10];
if (DBG) ALOGD("%s(): close\n", __FUNCTION__);
if (read(client_prv->pipefd[0], end_cmd, sizeof(end_cmd)) > 0) {
close(client_prv->sock);
close(client_prv->pipefd[0]);
close(client_prv->pipefd[1]);
client_prv->sock = -1;
client_prv->b_connect = 0;
}
}
}
}
return NULL;
}
static int processUnsolicited(RilClientPrv *prv, Parcel &p) {
int32_t resp_id, len;
status_t status;
const void *data = NULL;
RilOnUnsolicited unsol_func = NULL;
status = p.readInt32(&resp_id);
if (status != NO_ERROR) {
ALOGE("%s: read resp_id failed.", __FUNCTION__);
return RIL_CLIENT_ERR_IO;
}
status = p.readInt32(&len);
if (status != NO_ERROR) {
//LOGE("%s: read length failed. assume zero length.", __FUNCTION__);
len = 0;
}
ALOGD("%s(): resp_id (%d), len(%d)\n", __FUNCTION__, resp_id, len);
if (len)
data = p.readInplace(len);
// Find unsolicited response handler.
unsol_func = FindUnsolHandler(prv, (uint32_t)resp_id);
if (unsol_func) {
unsol_func(prv->parent, data, len);
}
return RIL_CLIENT_ERR_SUCCESS;
}
static int processSolicited(RilClientPrv *prv, Parcel &p) {
int32_t token, err, len;
status_t status;
const void *data = NULL;
RilOnComplete req_func = NULL;
int ret = RIL_CLIENT_ERR_SUCCESS;
uint32_t req_id = 0;
if (DBG) ALOGD("%s()", __FUNCTION__);
status = p.readInt32(&token);
if (status != NO_ERROR) {
ALOGE("%s: Read token fail. Status %d\n", __FUNCTION__, status);
return RIL_CLIENT_ERR_IO;
}
if (IsValidToken(&(prv->token_pool), token) == 0) {
ALOGE("%s: Invalid Token", __FUNCTION__);
return RIL_CLIENT_ERR_INVAL; // Invalid token.
}
status = p.readInt32(&err);
if (status != NO_ERROR) {
ALOGE("%s: Read err fail. Status %d\n", __FUNCTION__, status);
ret = RIL_CLIENT_ERR_IO;
goto error;
}
// Don't go further for error response.
if (err != RIL_CLIENT_ERR_SUCCESS) {
ALOGE("%s: Error %d\n", __FUNCTION__, err);
if (prv->err_cb)
prv->err_cb(prv->err_cb_data, err);
ret = RIL_CLIENT_ERR_SUCCESS;
goto error;
}
status = p.readInt32(&len);
if (status != NO_ERROR) {
/* no length field */
len = 0;
}
if (len)
data = p.readInplace(len);
// Find request handler for the token.
// First, FindReqHandler() searches request history with the token
// and finds out a request ID. Then, it search request handler table
// with the request ID.
req_func = FindReqHandler(prv, token, &req_id);
if (req_func)
{
if (DBG) ALOGD("[*] Call handler");
req_func(prv->parent, data, len);
if(prv->b_del_handler) {
prv->b_del_handler = 0;
RegisterRequestCompleteHandler(prv->parent, req_id, NULL);
}
} else {
if (DBG) ALOGD("%s: No handler for token %d\n", __FUNCTION__, token);
}
error:
FreeToken(&(prv->token_pool), token);
ClearReqHistory(prv, token);
return ret;
}
static int processRxBuffer(RilClientPrv *prv, void *buffer, size_t buflen) {
Parcel p;
int32_t response_type;
status_t status;
int ret = RIL_CLIENT_ERR_SUCCESS;
acquire_wake_lock(PARTIAL_WAKE_LOCK, RIL_CLIENT_WAKE_LOCK);
p.setData((uint8_t *)buffer, buflen);
status = p.readInt32(&response_type);
if (DBG) ALOGD("%s: status %d response_type %d", __FUNCTION__, status, response_type);
if (status != NO_ERROR) {
ret = RIL_CLIENT_ERR_IO;
goto EXIT;
}
// FOr unsolicited response.
if (response_type == RESPONSE_UNSOLICITED) {
ret = processUnsolicited(prv, p);
}
// For solicited response.
else if (response_type == RESPONSE_SOLICITED) {
ret = processSolicited(prv, p);
if (ret != RIL_CLIENT_ERR_SUCCESS && prv->err_cb) {
prv->err_cb(prv->err_cb_data, ret);
}
}
else {
ret = RIL_CLIENT_ERR_INVAL;
}
EXIT:
release_wake_lock(RIL_CLIENT_WAKE_LOCK);
return ret;
}
static uint32_t AllocateToken(uint32_t *token_pool) {
int i;
// Token pool is full.
if (*token_pool == 0xFFFFFFFF)
return 0;
for (i = 0; i < 32; i++) {
uint32_t new_token = 0x00000001 << i;
if ((*token_pool & new_token) == 0) {
*token_pool |= new_token;
return new_token;
}
}
return 0;
}
static void FreeToken(uint32_t *token_pool, uint32_t token) {
*token_pool &= ~token;
}
static uint8_t IsValidToken(uint32_t *token_pool, uint32_t token) {
if (token == 0)
return 0;
if ((*token_pool & token) == token)
return 1;
else
return 0;
}
static int RecordReqHistory(RilClientPrv *prv, int token, uint32_t id) {
int i = 0;
if (DBG) ALOGD("[*] %s(): token(%d), ID(%d)\n", __FUNCTION__, token, id);
for (i = 0; i < TOKEN_POOL_SIZE; i++) {
if (prv->history[i].token == 0) {
prv->history[i].token = token;
prv->history[i].id = id;
if (DBG) ALOGD("[*] %s(): token(%d), ID(%d)\n", __FUNCTION__, token, id);
return RIL_CLIENT_ERR_SUCCESS;
}
}
ALOGE("%s: No free record for token %d", __FUNCTION__, token);
return RIL_CLIENT_ERR_RESOURCE;
}
static void ClearReqHistory(RilClientPrv *prv, int token) {
int i = 0;
if (DBG) ALOGD("[*] %s(): token(%d)\n", __FUNCTION__, token);
for (i = 0; i < TOKEN_POOL_SIZE; i++) {
if (prv->history[i].token == token) {
memset(&(prv->history[i]), 0, sizeof(ReqHistory));
break;
}
}
}
static RilOnUnsolicited FindUnsolHandler(RilClientPrv *prv, uint32_t id) {
int i;
// Search unsolicited handler table.
for (i = 0; i < REQ_POOL_SIZE; i++) {
if (prv->unsol_handlers[i].id == id)
return prv->unsol_handlers[i].handler;
}
return (RilOnUnsolicited)NULL;
}
static RilOnComplete FindReqHandler(RilClientPrv *prv, int token, uint32_t *id) {
int i = 0;
int j = 0;
if (DBG) ALOGD("[*] %s(): token(%d)\n", __FUNCTION__, token);
// Search request history.
for (i = 0; i < TOKEN_POOL_SIZE; i++) {
ALOGD("[*] %s(): history_token(%d)\n", __FUNCTION__, prv->history[i].token);
if (prv->history[i].token == token) {
// Search request handler with request ID found.
for (j = 0; j < REQ_POOL_SIZE; j++) {
ALOGD("[*] %s(): token(%d), req_id(%d), history_id(%d)\n", __FUNCTION__, token, prv->history[i].id, prv->history[i].id);
if (prv->req_handlers[j].id == prv->history[i].id) {
*id = prv->req_handlers[j].id;
return prv->req_handlers[j].handler;
}
}
}
}
return NULL;
}
static int blockingWrite(int fd, const void *buffer, size_t len) {
size_t writeOffset = 0;
const uint8_t *toWrite;
ssize_t written = 0;
if (buffer == NULL)
return -1;
toWrite = (const uint8_t *)buffer;
while (writeOffset < len) {
do
{
written = write(fd, toWrite + writeOffset, len - writeOffset);
} while (written < 0 && errno == EINTR);
if (written >= 0) {
writeOffset += written;
}
else {
ALOGE ("RIL Response: unexpected error on write errno:%d", errno);
close(fd);
return -1;
}
}
return 0;
}
} // namespace android
// end of file