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Your
program's input and output
By default, the program
you run under GDB does input and output to the same terminal that GDB uses.
GDB switches the terminal to its own terminal modes to interact with you,
but it records the terminal modes your program was using and switches back
to them when you continue running your program.
info terminal
Displays information recorded
by GDB about the terminal modes your program is using.
You can redirect your program’s
input and/or output using shell redirection with the run
command. For example, run
> outfile
starts your program, diverting its output to the file, outfile.
Another way to specify where your program should do input and output is
with the tty
command. This command accepts a file name as argument, and causes this
file to be the default for future run
commands.
It also resets the controlling
terminal for the child process, for future run
commands. For example, tty
/dev/ttyb
directs that processes started with subsequent run commands default to
do input and output on the terminal ‘/dev/ttyb’
and have that as their controlling terminal.
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.
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