Here is a highly instructive article on the innards of strace, a Linux utility for tracing system calls in a process and its children. The sample code turns on ptrace for the child before starting the child, so I am a little curious about how it works when I attach it to a process that is always running.
At a previous job, I saw crashes in vfork() when using strace on make. I'm told that it should work, so I have to assume that it was caused by yet more memory bugs in the poorly written code at that company. Now I wish I'd saved the crashing example so that I could dive into it further.
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