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There is a way to get the output of a running process. But it should be considered a hack:
Let's say the PID of the process is 22499:
Let's say the PID of the process is 22499:
~$ touch log
~$ gdb -p 22499
(gdb) p close(1) # This closes the stdout of the running process
(gdb) p open("/home/.../log", 1) # This will open the log-file with O_WRITE
(gdb) c