[Rpm-maint] [rpm-software-management/rpm] Add macro to force fsync() on close() (#187)

[Jeff Johnson]

Hmmm ... glibc  (which uses mmap(2) for stdio if requested) would benefit from being able to mark the stdio buffer-in-use with *_DONTNEED using madvise/posix_fadvise.

At a minimum, cvtfmode() in rpmio/rpmio.c would need to be extended to pass the glibc-peculier 'm' flag through to fopen(3) .... ah "info libc" indicates mmap(2) is permitted only for input files, never mind.

(aside)
Note that rpmio/rpmio.c cvtfmode() likely should be modified to pass all the glibc-peculier flags through to fopen(3): 'c', 'e', 'm', 'x' (see "info libc" and search for "open"). todo++ @rpm5.org

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