Hi.
I'm writing local message queue library which uses the unix domain
socket(PF_LOCAL, SOCK_DGRAM).
By experimental, on my gentoo linux system (kernel 2.6.15, glibc
2.3.5),
the maximum size of a unix-domain datagram packet is 65536(0x10000)
bytes.
Is there a named macro for this size?
If not, does it fixed value across most systems?
Or, Is there an easy way to determine the maximum size on run-time?
Thanks for advance.
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 cinsky (25)
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3/20/2006 10:44:57 PM |
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<cinsky@gmail.com> wrote in message
news:1142894697.784818.141710@u72g2000cwu.googlegroups.com...
> Hi.
>
> I'm writing local message queue library which uses the unix domain
> socket(PF_LOCAL, SOCK_DGRAM).
>
> By experimental, on my gentoo linux system (kernel 2.6.15, glibc
> 2.3.5),
> the maximum size of a unix-domain datagram packet is 65536(0x10000)
> bytes.
>
> Is there a named macro for this size?
No that I know of.
> If not, does it fixed value across most systems?
It is fixed.
> Or, Is there an easy way to determine the maximum size on run-time?
>
> Thanks for advance.
It is 65,536, it will always be 65,536. That is the maximum datagram
size that the UDP protocol can support.
DS
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 David
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3/21/2006 6:17:12 AM
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On 2006-03-21, David Schwartz <davids@webmaster.com> wrote:
>
> <cinsky@gmail.com> wrote in message
> news:1142894697.784818.141710@u72g2000cwu.googlegroups.com...
>> Hi.
>>
>> I'm writing local message queue library which uses the unix domain
>> socket(PF_LOCAL, SOCK_DGRAM).
>>
>> By experimental, on my gentoo linux system (kernel 2.6.15, glibc
>> 2.3.5),
>> the maximum size of a unix-domain datagram packet is 65536(0x10000)
>> bytes.
>>
>> Is there a named macro for this size?
>
> No that I know of.
>
>> If not, does it fixed value across most systems?
>
> It is fixed.
>
>> Or, Is there an easy way to determine the maximum size on run-time?
>>
>> Thanks for advance.
>
> It is 65,536, it will always be 65,536. That is the maximum datagram
> size that the UDP protocol can support.
UDP is the protocol used for INET datagrams, i didn't think it applied
necessarily to LOCAL ones
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Jordan
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3/21/2006 6:24:18 AM
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On 20 Mar 2006 14:44:57 -0800, cinsky@gmail.com wrote:
>Hi.
>
>I'm writing local message queue library which uses the unix domain
>socket(PF_LOCAL, SOCK_DGRAM).
>
>By experimental, on my gentoo linux system (kernel 2.6.15, glibc
>2.3.5),
>the maximum size of a unix-domain datagram packet is 65536(0x10000)
>bytes.
>
>Is there a named macro for this size?
>If not, does it fixed value across most systems?
No, and there is quite some variation in this value across systems.
>Or, Is there an easy way to determine the maximum size on run-time?
For Linux, have a look at the descriptions of SO_SNDBUF and SO_RCVBUF
in the socket(7) manual page. These values affect the maximum Unix
domain datagram size.
Cheers,
Michael
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Michael
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3/21/2006 7:09:01 PM
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Sorry, somehow I thought this was UDP. You are right.
DS
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davids
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3/22/2006 1:56:58 AM
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Sorry, somehow I thought this was UDP. You are right.
DS
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davids
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3/22/2006 1:57:02 AM
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