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c-ares version 1.21.0
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This is a bugfix and cleanup release with some significant internal changes.
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Changes:
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o Provide better man page cross-links. [1]
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o Introduce ares_status_t as an enum rather than using #define list and
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integer data type for internal functions. [2]
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o Introduce ares_bool_t datatype rather than using an integer with 0/1 so
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it is clear based on the function prototype what it returns. [5]
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o Increase compiler warning levels by default. [6]
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o Use size_t and other more proper datatypes internally (rather than int). [7]
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o Many developers have used different code styles over the years, standardize
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on one and use clang-format to enforce the style. [8]
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o CMake can now control symbol visibility [9]
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o Replace multiple DNS hand-made parsers with new memory-safe DNS message
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parser. [10]
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Bug Fixes:
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o Tools: STAYOPEN flag could make tools not terminate. [3]
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o Socket callbacks were passed SOCK_STREAM instead of SOCK_DGRAM on udp. [4]
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Thanks go to these friendly people for their efforts and contributions:
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Brad House (@bradh352)
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Daniel Stenberg (@bagder)
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Gregor Jasny (@gjasny)
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(3 contributors)
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References to bug reports and discussions on issues:
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[1] = https://github.com/c-ares/c-ares/pull/565
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[2] = https://github.com/c-ares/c-ares/pull/567
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[3] = https://github.com/c-ares/c-ares/pull/569
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[4] = https://github.com/c-ares/c-ares/commit/a070d78
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[5] = https://github.com/c-ares/c-ares/pull/570
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[6] = https://github.com/c-ares/c-ares/pull/568
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[7] = https://github.com/c-ares/c-ares/pull/573
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[8] = https://github.com/c-ares/c-ares/pull/579
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[9] = https://github.com/c-ares/c-ares/pull/574
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[10] = https://github.com/c-ares/c-ares/pull/581
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