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NOTE:
• You can redirect your program input and output using shell redirection with the
run command. For example,
run > outfile
starts your program, diverting its output to the file 'outfile'.
• An explicit redirection in run overrides the tty command's effect on the
input/output device, but not its effect on the controlling terminal.
• When you use the tty command or redirect input in the run command, only the
input for your program is affected. The input for GDB still comes from your terminal.
4.7 Debugging a Running Process
You can use GDB to debug a running process by specifying the process ID. Following
commands are used to debug a running process:
attach process-id
This command attaches to a running process―one that was
started outside GDB. (info files shows your active
targets.) The command takes as argument a process ID. The
usual way to find out the process-id of a Unix process is
with the ps utility, or with the 'jobs -l' shell command.
attach does not repeat if you press RET a second time
after executing the command.
44 Running Programs Under GDB