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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 );
- phys_addr
- The physical address of the region.
- size
- The size of the region.
- name
- The name of the region.
The storage requirements for name are defined as
QNX_SHM_NAME_LEN.
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()
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