I've got a program using a third-party library that is printing
output to either stderr or stdout. When I set breakpoints on
printf, fprintf, fwrite gdb never stops. Is there a way to break on
any output to stdout/stderr no matter what function is called? Is
there a low level primitive all output functions call?
They all go through write() -- 'man 2 write' for details. But that
gets used for all writes, so it'll trap for all writes to disk, etc.
You might want to set a conditional breakpoint on write with the
first argument equal to 1 or 2 (stdout or stderr).
Hope this helps,
Eric
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