ptrace in unix tracing non-child processes

[Brent Callaghan]

SunOs ptrace() has this facility.  You can give it a pid with
the PTRACE_ATTACH request and attach to another process.  The other
process must be one of "yours" i.e. same uid/gid.  The process gets
a SIGSTOP.  A PTRACE_DETACH is used to send the traced process on
it's way when you've lost interest.

This facility is used by dbx.  You can give it a pid in place of
a core file name e.g. "dbx fnurg 1022".


Made in New Zealand -->  Brent Callaghan  @ Sun Microsystems
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