how to use the open() call

[pal]

Hi,

How to use the open() ( mean syntax ) to open a file and to append the
data every time at the end of the file.
My Problem is,

I created a file and written some data into it, and second time i
opened the file with the open() like
fd = open ("\dir\file.dat",O_WRONLY,0); and written some data into
this file.

But always I am not able to append the data to the file.instead it is
overwriting the file.
Is there any way to solve this problem .
Thanks.

[Martin Ambuhl]

pal wrote:

Hi,

How to use the open() ( mean syntax ) to open a file and to append the
data every time at the end of the file.

Unfortunately, open() is not a standard C call, and its meaning, syntax,
and attendant issues are determined by the implementation that you are
using. It is likely that that is a Unix-like one, in which case a Unix
(or Posix or Linux) newsgroup is the right one. The usual Posix/Unix
open() yields an int called a file-descriptor, which is not the way
streams are referenced in the standard C library. There the similar
call is fopen() which yields pointer-to-FILE. If you have trouble using
the standard C functions, this is the place. If your problem is with an
implementation-specific function like open(), this is not the place for it.

[viza]

On Tue, 19 Aug 2008 03:16:20 -0700, pal wrote:

How to use the open() ( mean syntax ) to open a file and to append the
data every time at the end of the file.

RTFM: man 2 open

Look for the bit about O_APPEND.

[vippstar]

On Aug 19, 3:01 pm, viza <[e-mail]>
wrote:

On Tue, 19 Aug 2008 03:16:20 -0700, pal wrote:

How to use the open() ( mean syntax ) to open a file and to append the
data every time at the end of the file.

RTFM: man 2 open

Look for the bit about O_APPEND.

Off-topic in comp.lang.c
It would be more appropriate in comp.unix.programmer where the POSIX
standard is topical.

[viza]

On Tue, 19 Aug 2008 16:54:06 -0700, vippstar wrote:

On Aug 19, 3:01 pm, viza wrote:

>On Tue, 19 Aug 2008 03:16:20 -0700, pal wrote:

>>How to use the open() ( mean syntax ) to open a file and to append

>Look for the bit about O_APPEND.

Off-topic in comp.lang.c

http://biblecc.com/luke/6-9.htm

[Richard Heathfield]

viza said:

On Tue, 19 Aug 2008 16:54:06 -0700, vippstar wrote:

>On Aug 19, 3:01 pm, viza wrote:

>>On Tue, 19 Aug 2008 03:16:20 -0700, pal wrote:

>>>How to use the open() ( mean syntax ) to open a file and to append

>>Look for the bit about O_APPEND.

>Off-topic in comp.lang.c

http://biblecc.com/luke/6-9.htm

Not really applicable - vippstar gave an appropriate redirection with the
intent of getting *better* help for the OP.

If someone asks for a newspaper in the butcher's shop, the shopkeeper who
reaches under the counter and pulls out a grease-spotted newspaper dating
back two weeks and with the Sudoku already half-filled in is not
performing as great a service as the shopkeeper who redirects the enquirer
next door to the newsagent.

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[Chad]

On Aug 20, 7:35*am, Richard Heathfield <[e-mail]:

viza said:

On Tue, 19 Aug 2008 16:54:06 -0700, vippstar wrote:

On Aug 19, 3:01 pm, viza wrote:
On Tue, 19 Aug 2008 03:16:20 -0700, pal wrote:

>>How to use the open() ( mean syntax ) to open a file and to append

>Look for the bit about O_APPEND.

Off-topic in comp.lang.c

http://biblecc.com/luke/6-9.htm

Not really applicable - vippstar gave an appropriate redirection with the
intent of getting *better* help for the OP.

If someone asks for a newspaper in the butcher's shop, the shopkeeper who
reaches under the counter and pulls out a grease-spotted newspaper dating
back two weeks and with the Sudoku already half-filled in is not
performing as great a service as the shopkeeper who redirects the enquirer
next door to the newsagent.

<OT>
Geeze, a while back I made a similar comment to another person.
Shortly after that, I got all these snide responses.
</OT>

[Richard Heathfield]

Chad said:

On Aug 20, 7:35 am, Richard Heathfield <[e-mail]:

<snip>

>vippstar gave an appropriate redirection with
the intent of getting *better* help for the OP.

If someone asks for a newspaper in the butcher's shop, the shopkeeper
who reaches under the counter and pulls out a grease-spotted newspaper
dating back two weeks and with the Sudoku already half-filled in is not
performing as great a service as the shopkeeper who redirects the
enquirer next door to the newsagent.

<OT>
Geeze, a while back I made a similar comment to another person.
Shortly after that, I got all these snide responses.
</OT>

Fear not. I'm sure some snide responses are winging their way to me even as
I write this.

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999