stdioGET_ERRNO()
ff_stdio.h
static portINLINE int stdioGET_ERRNO( void );
File related functions in the standard C library often return 0 for pass,
and -1 for fail. If -1 is returned then the reason for the failure is
stored in a variable called errno, which must be inspected separately.
FreeRTOS-Plus-FAT's standard stdio style interface maintains an errno variable
for each RTOS task. static portINLINE() returns the errno value for the calling
task.
Notes:
- The file system's C library style API uses the same errno values
as used by the stanard C library. These
are documented on a separate page.
- The file system's native API
has a more sophisticated error code system, and
returns error codes directly from its API functions.
Example usage:
void vAFunction( FF_FILE *pxFile, long lOffset, int iWhence )
{
int iReturned;
iReturned = ff_fseek( pxFile, lOffset, iWhence );
if( iReturned == 0 )
{
}
else
{
iReturned = stdioGET_ERRNO();
if( iReturned == pdFREERTOS_ERRNO_ESPIPE )
{
}
else if( iReturned == pdFREERTOS_ERRNO_EINVAL )
{
}
}
}
Example use of the stdioGET_ERRNO() API function
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