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these functions are horribly underspecified, inconsistent between
historical systems, and should never have been included. however, the
signatures we have match the glibc ones, and the glibc behavior is to
treat NxDomain and NODATA results as a success condition, not an
ENOENT error.
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this case statement was accidently left behind when this function
was refactored in commit e8f39ca4898237cf71657500f0b11534c47a0521.
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mistakenly ordering strings before addresses in the result buffer
broke the alignment that the preceding code had set up.
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according to the documentation in the man pages, the GNU extension
functions gethostbyaddr_r, gethostbyname_r and gethostbyname2_r are
guaranteed to set the result pointer to NULL in case of error or no
result.
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these changes reduce the size of the function somewhat and remove many
of its dependencies, including free. in principle it should now be
async-signal-safe, but this has not been verified in detail.
minor changes to error handling are also made.
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they're supposed to return an error code rather than using errno.
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