Re: redirect stdout and stderr to different file under sandboxing in linux

[Bhuvan Gupta <bhuvangu@xxxxxxxxx>]

Bob,

With full respect...can you please go through my previous mail in this thread...info given by you is not relevant here

On Saturday, May 23, 2015, Bob Gustafson <bobgus@xxxxxxx> wrote:

For compiling and testing, I usually do:

./a.out 2>&1 | tee tofile.txt

The 2>&1 takes the stderr and pushes it out along with the stdout.

The 'tee' provides a way to see the output on the screen as well as store it to disk (tofile.txt)

Have fun

Bob G

On 05/23/2015 06:19 AM, Bhuvan Gupta wrote:

MORE INFO

content of Test.cpp

#include<stdio>

 int main(void) {

  fprintf(stderr,"error/n");

  return 0;

 }

compile it and now

./a.out 

print error to console

./a.out 2> err

print to err file

sandbox ./a.out 2>err

nothing gets printed on console or in err file.

Is sandbox is eating it up ?

Thanks

Bhuvan

On Sat, May 23, 2015 at 4:02 PM, Bhuvan Gupta <bhuvangu@xxxxxxxxx> wrote:

EXTRA INFO:

even if i run 

sandbox ./a.out

Even then it doesnt print floating point error on console

On Sat, May 23, 2015 at 3:40 PM, Bhuvan Gupta <bhuvangu@xxxxxxxxx> wrote:

Hello All,

I have an Test.cpp which is run under sandbox(RHEL7):

Test.cpp content:

#include<stdio>

 int main(void) {

  int a = 1/0;

  return 0;

 }

compile it using gcc(4.8) Test.cpp which produces the a.out

Now running a.out prints floating pointing exception on console

Now i thought that if i redirect stderr to a file, i expect the error to be printed in file.

But that is not the case it still continue to print in console.

Googling reveal that under such exception the program is terminated immediately and if you capture the stderr of bash then it should redirect.

So i run

su -c ./a.out 2>err 

Bingo error get printed in err file.

Now the MAIN GAME STARTS

i want to run it under sandbox 

so i run:

su -c 'sandbox ./a.out 1>out 2>err'

But there is nothing printed in err file or in console.

How to capture stdout and stderr under such situation ?

Thanks

Bhuvan

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