Отв.: Отв.: Отв.: r+b filemode

[Oleg Moroz]

________________________________
От: Chris Johns <chrisj at rtems.org>
Кому: Oleg Moroz <oleg_moroz at yahoo.com>
Копия: "rtems-users at rtems.org" <rtems-users at rtems.org>
Отправлено: суббота, 28 май 2011 3:23
Тема: Re: Отв.: Отв.: r+b filemode

Returning us to the list.

On 27/05/11 7:33 PM, Oleg Moroz wrote:
> i'm using rfs.

Thanks.

Which version of RTEMS are you using ?

Chris

> ------------------------------------------------------------------------
> *От:* Chris Johns <chrisj at rtems.org>
> *Кому:* Oleg Moroz <oleg_moroz at yahoo.com>
> *Копия:* Joel Sherrill <joel.sherrill at oarcorp.com>;
> "rtems-users at rtems.org" <rtems-users at rtems.org>
> *Отправлено:* пятница, 27 май 2011 11:38
> *Тема:* Re: Отв.: r+b filemode
>
> On 27/05/11 3:00 PM, Oleg Moroz wrote:
>  >
>  >
>  > ------------------------------------------------------------------------
>  > *От:* Joel Sherrill <joel.sherrill at oarcorp.com
> <mailto:joel.sherrill at oarcorp.com>>
>  > *Кому:* Oleg Moroz <oleg_moroz at yahoo.com
> <mailto:oleg_moroz at yahoo.com>>; "rtems-users at rtems.org
> <mailto:rtems-users at rtems.org>"
>  > <rtems-users at rtems.org <mailto:rtems-users at rtems.org>>
>  > *Отправлено:* четверг, 26 май 2011 21:57
>  > *Тема:* Re: r+b filemode
>  >
>  > Which filesystem?
>  >
>  > Do you have a complete small test case?
>  >
>  > Someone else will likely have other ideas. I am on travel and just
>  > wanted to ask the obviuous questions.
>  >
>  > --joel
>  >
>  > Oleg Moroz <oleg_moroz at yahoo.com <mailto:oleg_moroz at yahoo.com>
> <mailto:oleg_moroz at yahoo.com <mailto:oleg_moroz at yahoo.com>>> wrote:
>  >
>  > >Hello everyone, i have a trouble with opening file. i have opened the
>  > file with "wb" mode. Write to it 512 bytes. close it. after this open it
>  > with "r+b" mode. then trying:
>  > >
>  > >///
>  > >fseek(file,0,SEEK_END);
>  > >int i = ftell(file);
>  > >///
>  > >
>  > >
>  > >
>  > >after this i=0
>  > >
>  > >but when i'm opening file with "rb" mode - i=512. how i can use "r+b"
>  > mode?
>  >
>  > int create_ring_buffer_file(char *filename)
>  > {
>  > FILE* outfile=fopen(filename,"wb");
>  >
>  > if (outfile==NULL) return -1;
>  >
>  > char *block=(char *)malloc(512);
>  > memset(block,0,512);
>  >
>  > fwrite(block,512,1,outfile);
>  > free(block);
>  > fclose(outfile);
>  > outfile=fopen(filename,"r+b");
>  > fseek(outfile,0,2);
>  > int i = ftell(outfile); //i=0
>  > fclose(outfile);
>  >
>  > outfile=fopen(filename,"rb");
>  > fseek(outfile,0,2);
>  > int i = ftell(outfile); //i=512
>  > fclose(outfile);
>  > return 0;
>  > }
>  >
>
> Which file system are you using ?
>
> Chris
>
>
i'm using RTEMS 4.10
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