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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 net.cc 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.
Pierre
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/winsock/gethostby
> 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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