fopen() accept binary modes "rb", "wb", ...
Does open() have similar thing?

For instance, http://www.scit.wlv.ac.uk/cgi-bin/mansec?2+open doesn't contai
n "binary".

--
Alex Vinokur
mailto:alexvn@connect.to
http://mathforum.org/library/view/10978.html

[ Post a follow-up to this message ]

On Tue, 20 Apr 2004 10:46:06 +0300,
Alex Vinokur <alexvn@big.foot.com> wrote:


> fopen() accept binary modes "rb", "wb", ...
> Does open() have similar thing?
>
> For instance, http://www.scit.wlv.ac.uk/cgi-bin/mansec?2+open doesn't cont
ain "binary".
>


Old C compilers for MSDOS used to support a O_BINARY flag for the open() cal
l.


Villy

[ Post a follow-up to this message ]

Alex Vinokur wrote:
> fopen() accept binary modes "rb", "wb", ...
> Does open() have similar thing?

The "b" support is for strict compliance to ISO C.  On UNIX it has *no
effect*.  Your fopen man page should make those points. If such a mode
existed for open() it also would have no effect.

-- ced

>
> For instance, http://www.scit.wlv.ac.uk/cgi-bin/mansec?2+open doesn't cont
ain "binary".
>
> --
>    Alex Vinokur
>      mailto:alexvn@connect.to
>      http://mathforum.org/library/view/10978.html
>
>
>


--
Chuck Dillon
Senior Software Engineer
NimbleGen Systems Inc.

[ Post a follow-up to this message ]

"Chuck Dillon" <cdillon@nimblegen.com> wrote in message news:c6389q$2q4$1@grandcanyon.binc.n
et...
> Alex Vinokur wrote: 
>
> The "b" support is for strict compliance to ISO C.  On UNIX it has *no
> effect*.  Your fopen man page should make those points.

I have tested than on Cygwin (Cygwin is a Linux-like environment for Windows
).
Fo Cygwin a binary mode essentially improves performance.

http://article.gmane.org/gmane.comp...+.perfometer/45 (Raw run log)
http://article.gmane.org/gmane.comp...+.perfometer/44 (Source)

I don't know if it is truth for "pure" UNIX (not on Windows).

[snip]

--
Alex Vinokur
mailto:alexvn@connect.to
http://mathforum.org/library/view/10978.html

[ Post a follow-up to this message ]

On Tue, 20 Apr 2004 16:44:50 +0300,
Alex Vinokur <alexvn@big.foot.com> wrote:


>
> I have tested than on Cygwin (Cygwin is a Linux-like environment for Windo
ws).
> Fo Cygwin a binary mode essentially improves performance.
>

That is expected considering that when reading a text file every occurence
of CRLF pairs must be replaced by a single \n character before representing
the data to the user program.

>
> I don't know if it is truth for "pure" UNIX (not on Windows).
>

In pure unix there is no difference between binary and text file and
therefore no proformance difference either.



Villy

[ Post a follow-up to this message ]

On Tue, 20 Apr 2004 16:44:50 +0300, Alex Vinokur wrote:

>
> "Chuck Dillon" <cdillon@nimblegen.com> wrote in message news:c6389q$2q4$1@
grandcanyon.binc.net... 
>
> I have tested than on Cygwin (Cygwin is a Linux-like environment for Windo
ws).
> Fo Cygwin a binary mode essentially improves performance.
>
> http://article.gmane.org/gmane.comp...+.perfometer/45 (Raw run log)
> http://article.gmane.org/gmane.comp...+.perfometer/44 (Source)
>
> I don't know if it is truth for "pure" UNIX (not on Windows).
>
> [snip]
>
> --
>    Alex Vinokur
>      mailto:alexvn@connect.to
>      http://mathforum.org/library/view/10978.html

Be careful, because in cygwin, you can mount paths in a binary mode or a
text mode. Then when you open files, you can use binary or text. It can
all be rather confusing.

--Mac

[ Post a follow-up to this message ]