Outputting text to a file

[Robert]

Hi,

I'm creating simple logging function in my server application but i've come
to a little problem. I use fopen and fprintf to open and print to that file
and after the application quits fclose ofcourse but the data get's only
written when i use fclose, i need something so it gets written to the file
directly because otherwise the logging won't have much effect because i want
to run the program for long times. Is there any function to flush the buffer
to the file?

Thanks in Advance,

Robert Mens

[Joona I Palaste]

Robert <R.****@hetnet.nl> scribbled the following:

Hi, I'm creating simple logging function in my server application but i've come
to a little problem. I use fopen and fprintf to open and print to that file
and after the application quits fclose ofcourse but the data get's only
written when i use fclose, i need something so it gets written to the file
directly because otherwise the logging won't have much effect because i want
to run the program for long times. Is there any function to flush the buffer
to the file?

Try fflush().

--
/-- Joona Palaste (pa*****@cc.helsinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"Bad things only happen to scoundrels."
- Moominmamma

[Joona I Palaste]

Robert <R.****@hetnet.nl> scribbled the following:

Hi, I'm creating simple logging function in my server application but i've come
to a little problem. I use fopen and fprintf to open and print to that file
and after the application quits fclose ofcourse but the data get's only
written when i use fclose, i need something so it gets written to the file
directly because otherwise the logging won't have much effect because i want
to run the program for long times. Is there any function to flush the buffer
to the file?

Try fflush().

--
/-- Joona Palaste (pa*****@cc.helsinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"Bad things only happen to scoundrels."
- Moominmamma

[Martin Ambuhl]

Robert wrote:

Hi,

I'm creating simple logging function in my server application but i've come
to a little problem. I use fopen and fprintf to open and print to that file
and after the application quits fclose ofcourse but the data get's only
written when i use fclose, i need something so it gets written to the file
directly because otherwise the logging won't have much effect because i want
to run the program for long times. Is there any function to flush the buffer
to the file?

Surprisingly, it's called fflush().

[Martin Ambuhl]

Robert wrote:

Hi,

I'm creating simple logging function in my server application but i've come
to a little problem. I use fopen and fprintf to open and print to that file
and after the application quits fclose ofcourse but the data get's only
written when i use fclose, i need something so it gets written to the file
directly because otherwise the logging won't have much effect because i want
to run the program for long times. Is there any function to flush the buffer
to the file?

Surprisingly, it's called fflush().

[Dan Pop]

In <c5**********@oravannahka.helsinki.fi> Joona I Palaste <pa*****@cc.helsinki.fi> writes:

Robert <R.****@hetnet.nl> scribbled the following:

Hi,

I'm creating simple logging function in my server application but i've come
to a little problem. I use fopen and fprintf to open and print to that file
and after the application quits fclose ofcourse but the data get's only
written when i use fclose, i need something so it gets written to the file
directly because otherwise the logging won't have much effect because i want
to run the program for long times. Is there any function to flush the buffer
to the file?

Try fflush().

If it doesn't have the desired effect (the output is still buffered by
the OS, even if it left your program), close the file after logging each
item and reopen it in append mode before logging a new item. With some
network file systems this may be your only chance of forcing the output to
its final destination (short of using non-standard library calls).

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de

[Dan Pop]

In <c5**********@oravannahka.helsinki.fi> Joona I Palaste <pa*****@cc.helsinki.fi> writes:

Robert <R.****@hetnet.nl> scribbled the following:

Hi,

I'm creating simple logging function in my server application but i've come
to a little problem. I use fopen and fprintf to open and print to that file
and after the application quits fclose ofcourse but the data get's only
written when i use fclose, i need something so it gets written to the file
directly because otherwise the logging won't have much effect because i want
to run the program for long times. Is there any function to flush the buffer
to the file?

Try fflush().

If it doesn't have the desired effect (the output is still buffered by
the OS, even if it left your program), close the file after logging each
item and reopen it in append mode before logging a new item. With some
network file systems this may be your only chance of forcing the output to
its final destination (short of using non-standard library calls).

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de