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Previously mmap with MAP_FIXED would fail with EINVAL on an attempt to map an address range contained in the chunk of an existing mapping. With this commit, mmap will succeed, provided the mappings are anonymous, the MAP_SHARED/MAP_PRIVATE flags agree, and MAP_NORESERVE is not set for either mapping. Addresses: https://cygwin.com/pipermail/cygwin/2024-December/256901.html Signed-off-by: Ken Brown <kbrown@cornell.edu>
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin