Storage_OpenMutableFile Function
Header: #include <applibs/storage.h>
Retrieves a file descriptor to the mutable storage file for the application. If the application doesn't already have a mutable storage file, this function creates a file and then returns the file descriptor.
A mutable storage file stores and persists data over a device reboot or system update.
int Storage_OpenMutableFile(void);
Errors
Returns -1 if an error is encountered and sets errno to the error value.
EACCES: The application does not have the required application manifest capability (MutableStorage).
EIO: An error occurred while trying to create the file.
Any other errno may also be specified; such errors aren't deterministic and the same behavior might not be retained through system updates.
Return value
Returns a file descriptor to the mutable storage file; or -1 for failure, in which case errno is set to the error.
Application manifest requirements
The application manifest must include the MutableStorage capability.