Lennart Poettering
f75cb0a04b
This new wrapper for munmap() asserts on a bunch of unexpected conditions: 1. if we try to unmap a valid pointer with a zero size 2. if we try to unmap a valid pointer with a size of SIZE_MAX (this is supposed to catch PAGE_SIZE() overflows, which is often used in combination) 3. munmap() failing It also turns invocations with a NULL or MAP_FAILED pointer into NOPs. That's useful to simplify error clean-up paths in case mmap() failed. Finaly it returns a NULL pointer to the input type, so that we can write: p = mummap_safe(p, sz); to invalidate both memory and the pointer p in one go.
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