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Re: cygwin 1.3.17-1 gethostbyname() leak

On Wed, Dec 11, 2002 at 06:12:21AM +1100, Noel Gordon wrote:

> If it is true that cygwin uses gethostbyname() from wsock32.dll, and
> returns the wsock32.dll hostent* result to the application, then it
> is perhaps unwise to free() it. Following your tip, we find from ...

In cygwin takes the result from the MS GetHostByName and copies
it to its own calloc'ed structure.
Not sure why, given that the MS function already returns a pointer to
a per thread structure, as indicated below.

> name_2.asp
>   Remarks
>   The gethostbyname function returns a pointer to a hostent structure - a
>   structure allocated by Windows Sockets. The hostent structure contains
>   the results of a successful search for the host specified in the name
>   parameter [of gethostbyname()].
>   The application must never attempt to modify this structure or to free
>   any of its components. Furthermore, only one copy of this structure is
>   allocated per thread, so the application should copy any information it
>   needs before issuing any other Windows Sockets function calls.

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