18c2ecf20Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 28c2ecf20Sopenharmony_ci.. c:namespace:: DTV.dmx 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci.. _dmx-munmap: 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci************ 78c2ecf20Sopenharmony_ciDVB munmap() 88c2ecf20Sopenharmony_ci************ 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciName 118c2ecf20Sopenharmony_ci==== 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_cidmx-munmap - Unmap device memory 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci.. warning:: This API is still experimental. 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ciSynopsis 188c2ecf20Sopenharmony_ci======== 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ci.. code-block:: c 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ci #include <unistd.h> 238c2ecf20Sopenharmony_ci #include <sys/mman.h> 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ci.. c:function:: int munmap( void *start, size_t length ) 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ciArguments 288c2ecf20Sopenharmony_ci========= 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci``start`` 318c2ecf20Sopenharmony_ci Address of the mapped buffer as returned by the 328c2ecf20Sopenharmony_ci :c:func:`mmap()` function. 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ci``length`` 358c2ecf20Sopenharmony_ci Length of the mapped buffer. This must be the same value as given to 368c2ecf20Sopenharmony_ci :c:func:`mmap()`. 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ciDescription 398c2ecf20Sopenharmony_ci=========== 408c2ecf20Sopenharmony_ci 418c2ecf20Sopenharmony_ciUnmaps a previously with the :c:func:`mmap()` function mapped 428c2ecf20Sopenharmony_cibuffer and frees it, if possible. 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ciReturn Value 458c2ecf20Sopenharmony_ci============ 468c2ecf20Sopenharmony_ci 478c2ecf20Sopenharmony_ciOn success :c:func:`munmap()` returns 0, on failure -1 and the 488c2ecf20Sopenharmony_ci``errno`` variable is set appropriately: 498c2ecf20Sopenharmony_ci 508c2ecf20Sopenharmony_ciEINVAL 518c2ecf20Sopenharmony_ci The ``start`` or ``length`` is incorrect, or no buffers have been 528c2ecf20Sopenharmony_ci mapped yet. 53