netdev - Re: write() udp socket

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Message-ID: <CA+v9cxZAF27mXc6aCEPyOdqbeLved3_xibvDS4TQugHR=7owPg@mail.gmail.com>
Date:	Sun, 24 Jul 2011 16:33:10 +0800
From:	Huajun Li <huajun.li.lee@...il.com>
To:	ZHOU Xiaobo <xb.zhou@...com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: write() udp socket

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.

> question No2:
> Can I write() a UDP socket in multiple threads without locking?
>

In my opinion, you could. However, the receiver may not get what you expected.
>
> thanks
>
>
> ------------------
> Sincerely yours
>                         ZHOU Xiaobo
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