02-10-2007
stdout redirected?
Hi all,
I have a c++ program which is running fine but has some printfs which its spews on to the screen, which I need for debugging.
But, I execute this program through a java, i.e I run a java program which actually launches my c++ executable and when it does this, I see none of my printfs doing their job(or r they?).
Is the stdout being redirected by someone(cause the c++, program is quite old, and has been edited by people earlier to me). what shouls I be looking for in the program to see for redirections. Cause when I searched for stdout to see, if any over riding has been done, couuld not find any.
Is it that, when this c++ program is run under the scope of some other program the stdout points nowhere and all the print messages are obliterated?
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LEARN ABOUT HPUX
annotate-output
ANNOTATE-OUTPUT(1) General Commands Manual ANNOTATE-OUTPUT(1)
NAME
annotate-output - annotate program output with time and stream
SYNOPSIS
annotate-output [options] program [args ...]
DESCRIPTION
annotate-output will execute the specified program, while prepending every line with the current time and O for stdout and E for stderr.
OPTIONS
+FORMAT
Controls the timestamp format, as per date(1). Defaults to "%H:%M:%S".
-h, --help
Display a help message and exit successfully.
EXAMPLE
$ annotate-output make
21:41:21 I: Started make
21:41:21 O: gcc -Wall program.c
21:43:18 E: program.c: Couldn't compile, and took me ages to find out
21:43:19 E: collect2: ld returned 1 exit status
21:43:19 E: make: *** [all] Error 1
21:43:19 I: Finished with exitcode 2
BUGS
Since stdout and stderr are processed in parallel, it can happen that some lines received on stdout will show up before later-printed
stderr lines (and vice-versa).
This is unfortunately very hard to fix with the current annotation strategy. A fix would involve switching to PTRACE'ing the process.
Giving nice a (much) higher priority over the executed program could however cause this behaviour to show up less frequently.
The program does not work as well when the output is not linewise. In particular, when an interactive program asks for input, the question
might not be shown until after you have answered it. This will give the impression that the annotated program has hung, while it has not.
SEE ALSO
date(1)
SUPPORT
This program is community-supported (meaning: you'll need to fix it yourself). Patches are however appreciated, as is any feedback (posi-
tive or negative).
AUTHOR
annotate-output was written by Jeroen van Wolffelaar <jeroen@wolffelaar.nl> This manpage comes under the same copyright as annotate-output
itself, read /usr/bin/annotate-output (or wherever you install it) for the details.
DEBIAN
Debian Utilities ANNOTATE-OUTPUT(1)