Hi Sascha,
On Thu, Feb 14, 2013 at 10:13:05PM +0100, Sascha Hauer wrote:
> On Thu, Feb 14, 2013 at 02:08:29PM +0100, Alexander Aring wrote:
> > Add pread and pwrite functions.
> >
> > These functions setting file pointer to a given
> > offset with lseek and call read or write afterwards.
> >
> > Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
> > ---
> > fs/fs.c | 28 ++++++++++++++++++++++++++++
> > include/fs.h | 2 ++
> > 2 files changed, 30 insertions(+)
> >
> > diff --git a/fs/fs.c b/fs/fs.c
> > index 48d1c89..fea7e02 100644
> > --- a/fs/fs.c
> > +++ b/fs/fs.c
> > @@ -785,6 +785,20 @@ ssize_t read(int fd, void *buf, size_t count)
> > }
> > EXPORT_SYMBOL(read);
> >
> > +ssize_t pread(int fd, void *buf, size_t count, loff_t offset)
> > +{
> > + int ret;
> > +
> > + ret = lseek(fd, offset, SEEK_SET);
> > + if (ret < 0)
> > + goto out;
> > +
> > + ret = read(fd, buf, count);
> > +out:
> > + return ret;
> > +}
>
> The man page says that the file offset is not modified by pread/pwrite.
> If we add a standard function with a standard prototype I think it
> should have the same behaviour.
> Maybe this can be implemented similar to the current read() function
> is implemented. read() could then call pread() internally and advances
> the file offset afterwards.
Ok I will change this. Thanks.
Regards
Alex
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