07-02-2007
afaik, you cannot do that. Once the process starts with all the file descriptors in place, unix will not allow you to do this. You can setup some sort of mechanism where on receiving a signal, your process also writes whatever it is writing to stdout to another file.
But it will be a lot of work, so it just might make more sense to redirect stdout to a file and keep truncating it every so often (you could have a cronjob) till you need to see what the process is doing. When you do, stop truncating the file and whatever you need to check is just waiting in that file.
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pause(2) System Calls Manual pause(2)
NAME
pause - suspend process until signal
SYNOPSIS
DESCRIPTION
suspends the calling process until it receives a signal. The signal must be one that is not currently set to be ignored or blocked
(masked) by the calling process.
If the signal causes termination of the calling process, does not return.
If the signal is by the calling process and control is returned from the signal-catching function (see signal(5)), the calling process
resumes execution from the point of suspension; with a return value of -1 from and set to
APPLICATION USAGE
Threads Considerations
Signal dispositions (such as catch/default/ignore) are shared by all threads in the process and blocked signal masks are maintained by each
thread. Therefore, the signals being waited for should not be ignored by the process or blocked by the calling thread.
will suspend only the calling thread until it receives a signal.
If other threads in the process do not block the signal, the signal may be delivered to another thread in the process and the thread in may
continue waiting. For this reason, the use of is recommended instead of for multi-threaded applications.
For more information regarding signals and threads, refer to signal(5).
SEE ALSO
alarm(2), kill(2), sigwait(2), wait(2), signal(5).
STANDARDS CONFORMANCE
pause(2)