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Re: setting breakpoint for all writes to stderr

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Re: setting breakpoint for all writes to stderr

Subject: Re: setting breakpoint for all writes to stderr
From: Eric Albert <email@hidden>
Date: Wed, 5 Apr 2006 13:06:55 -0700

On Apr 5, 2006, at 12:57 PM, Mark Lilback wrote:

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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  >setting breakpoint for all writes to stderr (From: Mark Lilback <email@hidden>)




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