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a=e1sVV491RgrpLwSTMOnk8w==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=hqxEFHVobavvttKUrIwA:9 cc=ntf awl=host:13604 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzI5MDEwNyBTYWx0ZWRfX4oKPpUxt4Miz GOVUiwMsJvOnrIQl354qEtphXC8PpT0ViWpyi8tTa+sXYJMulQZkOEVp6zFKsSgdo2BQhsD0E2a GbVRspcIUSpY6eiqNI544/rmonxM/iJhgOhZnWRPrA5pEuHskyFDG8ecvqfw89hRZEEV6fs56TF 5ESX56G3vBVgXFYpXidNzuJFrhLeFANPfRIV1BmLBwkvzk8xD33CCZAmZxzYLZ2QDObLZr6Lmvx ScT08q41N8WSIz57t4zxf3mP8fGm/Ngb5rsEravtr3wqoMsp0ehd8thEih/00VJjHLWXz/vG6pF AqSuUjjlEKfM/B9deftyG9ggjyxlAlgXkRgzuYHHvh26RoxB1yn2t2BYZgcBH/HRNViAuLoJBFs Vb0hGsaSIdFoyohtkZ+0GiG3WbKIdiZAFOMubhPLEsjwTKc4y/d3BrpIUkI3hcu4GITpcgBj Content-Type: text/plain; charset="utf-8" There is pre-existing logic that appears to be undocumented for an mremap() shrink operation, where it turns out that the usual 'input range must span a single mapping' requirement no longer applies. In fact, it turns out that the input range specified by [old_address, old_size) may span any number of mappings, as long old_address resides at or within a mapping and [old_address, new_size) spans only a single mapping. Explicitly document this. Signed-off-by: Lorenzo Stoakes --- man/man2/mremap.2 | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/man/man2/mremap.2 b/man/man2/mremap.2 index 6ba51310c..bbd807f1b 100644 --- a/man/man2/mremap.2 +++ b/man/man2/mremap.2 @@ -48,8 +48,24 @@ The .B MREMAP_DONTUNMAP flag may be specified. .P -If the operation is not -simply moving mappings, +Equally, if the operation performs a shrink, +that is if +.I old_size +is greater than +.IR new_size , +then +.I old_size +may also span multiple mappings +which do not have to be +adjacent to one another. +However in this case, +.I new_size +must span only a single mapping. +.P +If the operation is neither a +.B MREMAP_FIXED +move +nor a shrink, then .I old_size must span only a single mapping. --=20 2.50.1