On 2019-06-15 12:27, Till Riedel wrote: > I have been using a very handy sudo hack, that broke lately (I think) when > updating cygwin: https://github.com/imachug/win-sudo > The trick is to spawn an elevated process using powershell and hook up the > calling file descripters. I now get "write error: Bad file descriptor" > To reproduce call: > powershell.exe Start-Process bash \"-c\",\"\'echo \>\>/proc/$$/fd/1 hello > world\;sleep 10\'\" > IMHO this used to work in former versions (print out hello world on the > calling > shell). Strangely > bash -c "echo >/proc/$$/fd/1 hello world" > works. So my initial guess is that is has to do with the decoupling of Cygwin > PIDs from Windows PIDs, but there were also changes in the proc file system... > Thanks a lot in advance for any help/thoughts!
Given: $ bash -c 'ls -dglo /dev/std* /proc/self /proc/$$ /proc/self/fd/[012]' lrwxrwxrwx 1 15 May 14 2013 /dev/stderr -> /proc/self/fd/2 lrwxrwxrwx 1 15 May 14 2013 /dev/stdin -> /proc/self/fd/0 lrwxrwxrwx 1 15 May 14 2013 /dev/stdout -> /proc/self/fd/1 dr-xr-xr-x 3 0 Jun 16 01:37 /proc/23846 lrwxrwxrwx 1 0 Jun 16 01:37 /proc/self -> 23846 lrwxrwxrwx 1 0 Jun 16 01:37 /proc/self/fd/0 -> /dev/pty0 lrwxrwxrwx 1 0 Jun 16 01:37 /proc/self/fd/1 -> /dev/pty0 lrwxrwxrwx 1 0 Jun 16 01:37 /proc/self/fd/2 -> /dev/pty0 the following seems to work as expected: $ powershell Start-Process bash \"-c\",\"\'echo \>\>/dev/stdout hello world\;sleep 10\'\" -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
