Map a shared memory region into the Audio HW DLL's address space
#include <audio_driver.h> void *ado_shm_mmap( off64_t phys_addr, size_t size, char *name );
The ado_shm_mmap() function maps a shared memory region into the Audio HW DLL's address space. This function is for cards where the DMA buffer is in onboard memory; it mmaps the card memory and makes the region shared without allocating it.
The ado_shm_alloc() function allocates a shared memory region; you use it mostly for the DMA buffer so that it can be shared.
A pointer to the shared memory region, or NULL if an error occurred (errno is set).
QNX Neutrino
Safety: | |
---|---|
Interrupt handler | No |
Signal handler | No |
Thread | No |
ado_shm_alloc(), ado_shm_free()