Sep 8, 2025 · RETURN VALUES Upon successful completion, mmap returns a pointer to the mapped region. Otherwise, a value of MAP_FAILED is returned and errno is set to indicate the error. The …

DESCRIPTION The mmap function causes the pages starting at addr and continuing for at most len bytes to be mapped from the object described by fd, starting at byte offset offset. If len is not a …

Sep 8, 2025 · bus_dmamem_mmap (). Returns -1 to indicate failure. Otherwise, returns an opaque value to be interpreted by the device pager. bus_dmatag_subregion (tag, min_addr, max_addr, …

The set of system calls avail- able for devices is chosen from open (2), close (2), read (2), write (2), ioctl (2), select (2), and mmap (2). Not all drivers implement all system calls, for example, calling mmap …

Sep 8, 2025 · convenient virtual address using the mmap(2) system call. After all shared objects have been successfully loaded, ld.elf_so proceeds to resolve external references from both the main …

Sep 8, 2025 · Provides support for user mmap(2) 'ing of DMA-safe memory. AUTOCONFIGURATION The ISA bus is an indirect-connection bus. During autoconfiguration each driver is required to probe …

Sep 8, 2025 · The mmap'ped buffer appears as a block of memory of size buffersize (as available via AUDIO_GETINFO or AUDIO_GETBUFINFO). The audio driver will continuously move data from this …