get stdout/stderr while running a program

get stdout/stderr while running a program

[Nagash]

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Hello ,

  i've got a small problem with c-programs writing on
  stdout/stderr. i cannot see the output while running the
  program over the emacs shell access.
  after exiting the program the buffer gets filled.
  a simultaneous output mode would be nice for debug...

  thanks for your help!

-- 
Best regards,
 Oliver


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RE: get stdout/stderr while running a program

[Victor Kirk]

>  i've got a small problem with c-programs writing on
>  stdout/stderr. i cannot see the output while running the
>  program over the emacs shell access.
>  after exiting the program the buffer gets filled.
>  a simultaneous output mode would be nice for debug...

Does your program flush the output?  What happens if you run
it from a shell outside of emacs?

Vic
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Re[2]: get stdout/stderr while running a program

[Nagash]

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Hello Victor,

Friday, November 29, 2002, 10:54:02 AM, you wrote:

>>  i've got a small problem with c-programs writing on
>>  stdout/stderr. i cannot see the output while running the
>>  program over the emacs shell access.
>>  after exiting the program the buffer gets filled.
>>  a simultaneous output mode would be nice for debug...

> Does your program flush the output?
yes, but only after exiting the program.

>   What happens if you run
>   it from a shell outside of emacs?
all output is immediately visible.

a little example:
/* c-code */
printf("my output");
/* "my output" now visible in the shell */

/* ... other lines of nice code */

exit(0);
/* "my output" now visible in my emacs buffer */


its a little bit exhausting to switch always between a shell
and emacs. it interrupts my working flow.


thanks for your help!

-- 
Best regards,
 Oliver                            mailto:nagash2270@yahoo.de


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Re: get stdout/stderr while running a program

[Andrew Markebo]

Hello!

Which platforms, compilers and distribution of emacs are you running
on?

        /Andy

|   i've got a small problem with c-programs writing on
|   stdout/stderr. i cannot see the output while running the
|   program over the emacs shell access.
|   after exiting the program the buffer gets filled.
|   a simultaneous output mode would be nice for debug...

-- 
 The eye of the beholder rests on the beauty!

Re: get stdout/stderr while running a program

[kgold]

emacs uses a pipe to route stdout to the buffer.  The C default for
pipes is fully buffered.  So you don't see the output until exit or
the buffer is full.

Put this into your C program main():

    setvbuf(stdout,0,_IONBF,0);

I'm not sure about stderr, since I thought it was unbuffered by
default..

Nagash <nagash2270@yahoo.de> writes:
> 
>   i've got a small problem with c-programs writing on
>   stdout/stderr. i cannot see the output while running the
>   program over the emacs shell access.
>   after exiting the program the buffer gets filled.
>   a simultaneous output mode would be nice for debug...

-- 
Ken Goldman   kgold@watson.ibm.com   914-784-7646