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The vmon->buf[_bis] buffers are nice to shrink to absurdly small
sizes for testing changes, but we can't do that when they're reused
for path construction.
Just use local on-stack buffers for constructing paths, and now things
continue to function just slower with vmon->buf[8].
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This trivial change eliminates the final EOF realization read() syscall on
every /proc file consumed for every process on every sample, which adds up.
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Bring libvmon code inline with the direction vwm has headed in terms
of coding style. Entirely mechanical changes with one exception
replacing a free()/=NULL idiom with try_free().
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We need to eventually plumb an vwm_overlays_t reference back to sample_cb,
for now we'll just obviate the need for the vwm_ptr global by plumbing the
vwm_t through.
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readdir_r() has been deprecated in glibc
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The samplers may set these, but we need to clear them on every vmon_sample().
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Trying this out now that there's a pile of files... sigh.
Note this spuriously duplicates list.h @ src/libvmon/list.h, the old Makefile
shared list.h between vwm and libvmon, but I'm letting them have their own
instances with autotools. Libvmon was always an independent project I just
pulled in for vwm's use, and will likely continue to be developed independent
of vwm with occasional syncs.
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Long overdue house cleaning.
The addition of compositing/monitoring overlays in vwm3 pushed vwm well past
what is a reasonable size for a simple thousand line file. This is a first
step towards restoring sanity in the code, but no behavioral differences are
intended, this is mostly just shuffling around and organizing code.
I expect some performance regressions initially, follow-on commits will make
more improvements to that end as the dust settles.
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