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Full Discussion: stderr in background process
Top Forums Programming stderr in background process Post 84034 by matrixmadhan on Wednesday 21st of September 2005 09:47:40 AM
Old 09-21-2005
stderr in background process
Herez the question,

In a process which writes into file FILE1 with descriptor
fHandler1 and it is run as a background process
where would statements be directed
when stderr descriptor is used.

fprintf(stderr,"some message\n");

assume that session from which it is run is terminated and later the above statement is executed.

Are there any chances for output given to stderr descriptor to be redirected
to the fHandler1...

because in one of our process, i could specifically see redirections are in a perplexed manner

fHandler1=fopen("ping.con","a");
fprintf(fHandler,"first segment\n);
fprintf(stderr,"errored value\n");

i am surprised to see the output errored value in the file ping.con

please let me know if i had to provide any more information.
 

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LEARN ABOUT MOJAVE

fddist

fddist(1m)							   USER COMMANDS							fddist(1m)

NAME

       fddist - file descriptor usage distributions. Uses DTrace.

SYNOPSIS

       fddist [-r|-w]

DESCRIPTION

       This  prints  distributions for read and write events by file descriptor, by process. This can be used to determine which file descriptor a
       process is doing the most I/O with.

       Since this uses DTrace, only users with root privileges can run this command.

OPTIONS

       -r     reads only

       -w     writes only

EXAMPLES

       Sample both read and write activity,
	      # fddist

       Sample reads only,
	      # fddist -r

FIELDS

       EXEC   process name

       PID    process ID

       value  file descriptor

       count  number of events

BASED ON

       /usr/demo/dtrace/lquantize.d

DOCUMENTATION

       DTrace Guide "Aggregations" chapter (docs.sun.com)

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       fddist will sample until Ctrl-C is hit.

SEE ALSO

       dtrace(1M)

version 0.70							   Jun 08, 2005 							fddist(1m)
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