gethostbyname_r

gethostbyname_r

[Jason Pyeron]

I am tring to port an application, but I cant seem to find the glibc2 
gethostbyname_r function.

Does anyone know?

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Re: gethostbyname_r

[Corinna Vinschen]

On Oct 11 10:15, Jason Pyeron wrote:
> 
> I am tring to port an application, but I cant seem to find the glibc2 
> gethostbyname_r function.
> 
> Does anyone know?

It doesn't exist on Cygwin.


Corinna

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Re: gethostbyname_r

[Jason Pyeron]

On Tue, 11 Oct 2005, Corinna Vinschen wrote:

> On Oct 11 10:15, Jason Pyeron wrote:
>>
>> I am tring to port an application, but I cant seem to find the glibc2
>> gethostbyname_r function.
>
> It doesn't exist on Cygwin.
>

so is this the only way to go? has any one verified the code?

http://www.cygwin.com/ml/cygwin/2004-04/msg00532.html

how come it never made it in?

http://www.cygwin.com/ml/cygwin/2004-04/msg00540.html

or since it is just calling the windows api, can I

#define gethostbyname_r gethostbyname

-jason

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Re: gethostbyname_r

[Brian Ford]

On Tue, 11 Oct 2005, Jason Pyeron wrote:
> On Tue, 11 Oct 2005, Corinna Vinschen wrote:
> > On Oct 11 10:15, Jason Pyeron wrote:
> >> I am tring to port an application, but I cant seem to find the glibc2
> >> gethostbyname_r function.
> >
> > It doesn't exist on Cygwin.
>
> so is this the only way to go? has any one verified the code?
>
> http://www.cygwin.com/ml/cygwin/2004-04/msg00532.html
>
> how come it never made it in?
>
> http://www.cygwin.com/ml/cygwin/2004-04/msg00540.html
>
> or since it is just calling the windows api, can I
>
> #define gethostbyname_r gethostbyname

There is almost no need for gethostbyname_r on Cygwin since its sole
purpose is to create a thread safe interface.  In most all cases, Cygwin's
gethostbyname is thread safe.

http://www.cygwin.com/ml/cygwin/2004-05/msg00202.html

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Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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Re: gethostbyname_r

[Richard Campbell]

Brian Ford wrote:
> 
> There is almost no need for gethostbyname_r on Cygwin since its sole
> purpose is to create a thread safe interface.  In most all cases, Cygwin's
> gethostbyname is thread safe.
 >
 > http://www.cygwin.com/ml/cygwin/2004-05/msg00202.html

1) Resolving a numeric host is more common than whatever (all - "most 
all") is, IMO.
2) The difference between most all and all is usually horrible to track 
down.

-Richard Campbell.

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Re: gethostbyname_r

[Corinna Vinschen]

On Oct 11 12:10, Richard Campbell wrote:
> Brian Ford wrote:
> >
> >There is almost no need for gethostbyname_r on Cygwin since its sole
> >purpose is to create a thread safe interface.  In most all cases, Cygwin's
> >gethostbyname is thread safe.
> >
> > http://www.cygwin.com/ml/cygwin/2004-05/msg00202.html
> 
> 1) Resolving a numeric host is more common than whatever (all - "most 
> all") is, IMO.
> 2) The difference between most all and all is usually horrible to track 
> down.

gethostbyname_r is a non-standard interface anyway.  It only exists in
glibc.  The portable way to do this is to create a wrapper function in
the application which handles access from multiple threads.


Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
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Re: gethostbyname_r

[Christopher Faylor]

On Tue, Oct 11, 2005 at 12:10:57PM -0400, Richard Campbell wrote:
>Brian Ford wrote:
>>There is almost no need for gethostbyname_r on Cygwin since its sole
>>purpose is to create a thread safe interface.  In most all cases, Cygwin's
>>gethostbyname is thread safe.
>>
>> http://www.cygwin.com/ml/cygwin/2004-05/msg00202.html
>
>1) Resolving a numeric host is more common than whatever (all - "most 
>all") is, IMO.
>2) The difference between most all and all is usually horrible to track 
>down.

AFAIK, cygwin's gethostbyname is thread safe in all cases.

cgf

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Re: gethostbyname_r

[Richard Campbell]

Christopher Faylor wrote:
> 
> AFAIK, cygwin's gethostbyname is thread safe in all cases.

Since I was referencing you for the proposition that it was not thread 
safe in the case of resolving a numeric IP, 
(http://www.cygwin.com/ml/cygwin/2004-05/msg00182.html ) I'll certainly 
defer to you.

-Richard Campbell.


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Re: gethostbyname_r

[Christopher Faylor]

On Tue, Oct 11, 2005 at 01:35:44PM -0400, Richard Campbell wrote:
>Christopher Faylor wrote:
>>AFAIK, cygwin's gethostbyname is thread safe in all cases.
>
>Since I was referencing you for the proposition that it was not thread
>safe in the case of resolving a numeric IP,
>(http://www.cygwin.com/ml/cygwin/2004-05/msg00182.html ) I'll certainly
>defer to you.

The thread-safeness problem was fixed in February of this year.

cgf

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Re: gethostbyname_r

[Gerrit P. Haase]

Christopher Faylor wrote:
> On Tue, Oct 11, 2005 at 12:10:57PM -0400, Richard Campbell wrote:
> 
>>Brian Ford wrote:
>>
>>>There is almost no need for gethostbyname_r on Cygwin since its sole
>>>purpose is to create a thread safe interface.  In most all cases, Cygwin's
>>>gethostbyname is thread safe.
>>>
>>>http://www.cygwin.com/ml/cygwin/2004-05/msg00202.html
>>
>>1) Resolving a numeric host is more common than whatever (all - "most 
>>all") is, IMO.
>>2) The difference between most all and all is usually horrible to track 
>>down.
> 
> 
> AFAIK, cygwin's gethostbyname is thread safe in all cases.

So it would be possible to add an alias gethostbyname_r == gethostbyname
to the list of exported functions?


Gerrit
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Re: gethostbyname_r

[Christopher Faylor]

On Tue, Oct 11, 2005 at 10:54:32PM +0200, Gerrit P. Haase wrote:
>Christopher Faylor wrote:
>>On Tue, Oct 11, 2005 at 12:10:57PM -0400, Richard Campbell wrote:
>>
>>>Brian Ford wrote:
>>>
>>>>There is almost no need for gethostbyname_r on Cygwin since its sole
>>>>purpose is to create a thread safe interface.  In most all cases, 
>>>>Cygwin's
>>>>gethostbyname is thread safe.
>>>>
>>>>http://www.cygwin.com/ml/cygwin/2004-05/msg00202.html
>>>
>>>1) Resolving a numeric host is more common than whatever (all - "most 
>>>all") is, IMO.
>>>2) The difference between most all and all is usually horrible to track 
>>>down.
>>
>>AFAIK, cygwin's gethostbyname is thread safe in all cases.
>
>So it would be possible to add an alias gethostbyname_r == gethostbyname
>to the list of exported functions?

Take a look at the man page for gethostbyname and gethostbyname_r.

cgf

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