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From: Jose Antonio Santos Cadenas <santoscadenas@gmail.com>
Date: Fri, 8 Apr 2011 09:04:37 +0200
Message-ID: <BANLkTim72aKHWTvQOjfbFwyxP1j4v2MFWg@mail.gmail.com>
Subject: Re: HDP, can't read data from fd which Acquire from HealthChannel
To: Yi Hui Fan <yihuifan@cn.ibm.com>
Cc: linux-bluetooth@vger.kernel.org
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Hi,

2011/4/8 Yi Hui Fan <yihuifan@cn.ibm.com>:
> Dears
>
> I'd like to build a demo for HDP sink. I try to use the DBUS API provided
> by Bluez. But there is a problem with unix fd to receive data.
>
> I can get fd by calling HealthChannel.Acquire method. ?following is the
> code I write to read data according the sock I got.
>
> ? ? ? ?fd_set rfds;
> ? ? ? ?struct timeval tv;
> ? ? ? ?int rv;
> ? ? ? ?char buff[1024];
>
> ? ? ? ?FD_ZERO(&rfds);
> ? ? ? ?FD_SET(sock, &rfds);
> ? ? ? ?tv.tv_sec = 10;
> ? ? ? ?tv.tv_usec = 500;
>
> ? ? ? ?rv = select(sock+1, &rfds, NULL, NULL, &tv);
>
> ? ? ? ?rv = recv(sock, buff, 1024, 0);
>
> rv is always return 0 when I call select method. I can't get anything.
>
> Any problem with these codes?

It seems that you don't have a valid file descriptor. How are you
getting the file descriptor? Are you using Dbus 1.4?


>
> Thanks &
> Best regards,

Regards

Jose.

>
> Yihui,Fan