netdev - Re: write() udp socket

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 25 Jul 2011 10:38:12 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Huajun Li <huajun.li.lee@...il.com>
CC:	ZHOU Xiaobo <xb.zhou@...com>, netdev <netdev@...r.kernel.org>
Subject: Re: write() udp socket

On 07/24/2011 01:33 AM, Huajun Li wrote:
> 2011/7/23 ZHOU Xiaobo<xb.zhou@...com>:
>> question No1:
>> When I call
>> ssize_t write(int fd, const void *buf, size_t count);
>>
>>
>> on a nonblocking UDP socket, is the return value  always equal to 'count'?
>>
>>
>
> I don't think so.  The function may be interrupt by signal or return
> due to other reason, so the return value only represents the size it
> writes successfully to the fd.

I believe it should either appaear to succeed or fail.  write() best not 
be sending partial UDP datagrams.  That would be "bad."
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html