/******************************************************************************
NAME
vc_gencmd_until
SYNOPSIS
int vc_gencmd_until(const char *cmd, const char *error_string, int timeout);
FUNCTION
Sends the command repeatedly, until one of the following situations occurs:
The specified response string is found within the gencmd response.
The specified error string is found within the gencmd response.
The timeout is reached.
The timeout is a rough value, do not use it for precise timing.
RETURNS
0 if the requested response was detected.
1 if the error string is detected or the timeout is reached.
******************************************************************************/
int vc_gencmd_until( char *cmd,
const char *property,
char *value,
const char *error_string,
int timeout) {
char response[128];
int length;
char *ret_value;
int ret = 1;
use_gencmd_service();
for (;timeout > 0; timeout -= 10) {
vc_gencmd(response, (int)sizeof(response), cmd);
if (strstr(response,error_string)) {
ret = 1;
break;
}
else if (vc_gencmd_string_property(response, property, &ret_value, &length) &&
strncmp(value,ret_value,(size_t)length)==0) {
ret = 0;
break;
}
vcos_sleep(10);
}
release_gencmd_service();
return ret;
}
void vc_gencmd_stop () {
// Assume a "power down" gencmd has been sent and the lock is held. There will
// be no response so this should be called instead.
int32_t success,i;
if (!gencmd_client.initialised)
return;
if(lock_obtain() == 0)
{
use_gencmd_service();
for(i = 0; i< (int32_t)gencmd_client.num_connections; i++) {
success = vchi_service_close( gencmd_client.open_handle[i]);
assert(success == 0);
}
gencmd_client.initialised = 0;
lock_release();
vcos_mutex_delete(&gencmd_client.lock);
vcos_event_delete(&gencmd_client.message_available_event);
}
}
/******************************************************************************
NAME
vc_gencmd_send
SYNOPSIS
int vc_gencmd_send( const char *format, ... )
FUNCTION
Send a string to general command service.
RETURNS
int
******************************************************************************/
int vc_gencmd_send_list ( const char *format, va_list a )
{
int success = -1;
// Obtain the lock and keep it so no one else can butt in while we await the response.
if(lock_obtain() == 0)
{
int length = vsnprintf( gencmd_client.command_buffer, GENCMD_MAX_LENGTH, format, a );
if (length >= 0 && length < GENCMD_MAX_LENGTH)
{
int i;
use_gencmd_service();
for( i=0; i<gencmd_client.num_connections; i++ ) {
success = vchi_msg_queue( gencmd_client.open_handle[i],
gencmd_client.command_buffer,
length+1,
VCHI_FLAGS_BLOCK_UNTIL_QUEUED, NULL );
if(success == 0)
{ // only want to send on one connection, so break on success
break;
}
}
release_gencmd_service();
}
lock_release();
}
return success;
}
/******************************************************************************
NAME
vc_gencmd_read_response
SYNOPSIS
int vc_gencmd_read_response
FUNCTION
Block until something comes back
RETURNS
Error code from dequeue message
******************************************************************************/
int vc_gencmd_read_response (char *response, int maxlen) {
int i = 0;
int success = -1;
int ret_code = 0;
int32_t sem_ok = 0;
if(lock_obtain() == 0)
{
//Note this will ALWAYS reset response buffer and overwrite any partially read responses
use_gencmd_service();
do {
//TODO : we need to deal with messages coming through on more than one connections properly
//At the moment it will always try to read the first connection if there is something there
for(i = 0; i < gencmd_client.num_connections; i++) {
//Check if there is something in the queue, if so return immediately
//otherwise wait for the event and read again
success = (int) vchi_msg_dequeue( gencmd_client.open_handle[i], gencmd_client.response_buffer,
sizeof(gencmd_client.response_buffer), &gencmd_client.response_length, VCHI_FLAGS_NONE);
if(success == 0) {
#ifdef __NetBSD__
uint32_t v;
#endif
#ifdef __NetBSD__
memcpy(&v, gencmd_client.response_buffer, sizeof(v));
ret_code = VC_VTOH32(v);
#else
ret_code = VC_VTOH32( *(int *)gencmd_client.response_buffer );
#endif
break;
} else {
gencmd_client.response_length = 0;
}
}
} while(!gencmd_client.response_length && vcos_event_wait(&gencmd_client.message_available_event) == VCOS_SUCCESS);
if(gencmd_client.response_length && sem_ok == 0) {
gencmd_client.response_length -= sizeof(int); //first word is error code
memcpy(response, gencmd_client.response_buffer+sizeof(int), (size_t) vcos_min((int)gencmd_client.response_length, (int)maxlen));
}
release_gencmd_service();
lock_release();
}
// If we read anything, return the VideoCore code. Error codes < 0 mean we failed to
// read anything...
//How do we let the caller know the response code of gencmd?
//return ret_code;
return success;
}
/******************************************************************************
NAME
vc_gencmd
SYNOPSIS
int vc_gencmd(char *response, int maxlen, const char *format, ...)
FUNCTION
Send a gencmd and receive the response as per vc_gencmd read_response.
RETURNS
int
******************************************************************************/
int vc_gencmd(char *response, int maxlen, const char *format, ...) {
va_list args;
int ret = -1;
use_gencmd_service();
va_start(args, format);
ret = vc_gencmd_send_list(format, args);
va_end (args);
if (ret >= 0) {
ret = vc_gencmd_read_response(response, maxlen);
}
release_gencmd_service();
return ret;
}