On Wed, 27 Mar 2002 19:20:19 -0500, you wrote: >On Wed, Mar 27, 2002@02:20:35PM -0600, Polley Christopher W wrote: >>Are there more complete instructions to strace besides --help, the Cygwin >>user guide, or winsup/utils/utils.sgml (all essentially the same thing)? > >If we had better documentation why would it be hidden? I didn't think it was "hidden", I only humbly thought there might be a more detailed document that the more clueful users on this list had awareness of. I'm sorry if I've offended you by my query. > >The best documentation is the source code. In this case, the use of >strace -p would require that you do your debugging from an account which >had the ability to access the executing pid. If you are running inetd >from a privileged account and stracing from a user account that won't >work for hopefully obvious reasons. Well, inetd is running from the system account (18). The user account I was using to run strace has local (machine) administrator privileges (i.e. is in the machine's "Administrators" group.) Is this sufficiently privileged?
Is the silent failure (immediate exit from strace) I observed a result of this lack of privilege? Could I instead put telnet stream tcp nowait root /usr/bin/strace strace -o /strace_telnetd.log all /usr/bin/in.telnetd in inetd.conf? Or will this cause problems? > >Also, due to limitations in the Windows API, there is no way to strace a >forked process via strace -p. strace -p uses the DebugActiveProcess >function and there is no way to tell the process being debugged that you >need to follow CreateProcess calls. I'm interpreting your statement to mean that the -p and -f options of strace are incompatible. I see now from reviewing the code how this is so. I am confused by the lack of "couldn't attach to pid %d<%d> for debugging" that I would expect if DebugActiveProcess were to fail due to lack of permission, and the lack of "Attached to pid %d (windows pid %u)\n" that I would expect if it were to succeed (in the first 5 cases of my previous email) and the lack of strace output from inetd handling a telnet request (in the last case) (granted, it wouldn't output anything from any of inetd's children). I guess I'll need to attach gdb to strace attaching to a pid... Thanks, Chris -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
