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Your program's input and output
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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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