[Tile-serving] [openstreetmap/mod_tile] cope with recv returning fewer bytes than expected (PR #347)

[Frederik Ramm]

When the `poll` system call signals readability on a socket, there is no guarantee that more than one byte is actually readable. In 99.9% of cases you will be able whatever the OS's internal buffer size is - something like 4k - and this will be more than enough for a mod_tile message. But you cannot rely on that. Assuming that `recv` will always return at least `sizeof (struct protocol_v2)` and throwing an error otherwise is bad design.

This pull request makes mod_tile concatenate the results of several `recv` calls until the desired number of bytes has been read.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/347

-- Commit Summary --

  * cope with recv returning fewer bytes than expected

-- File Changes --

    M src/mod_tile.c (55)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/347.patch
https://github.com/openstreetmap/mod_tile/pull/347.diff

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