Andrey Repin sent the following at Saturday, May 05, 2012 7:31 AM > On 5/4/2012 3:43 PM, Petrisor Eddy-Marian-B36037 wrote: >> I am using at work cygwin on various machines (XP and Windows 7) and made >> several scripts that use gnu utilities from cygwin. One of those is a script >> that starts in paralel instances of cmd various parts of a build system >> through a sh script that invokes 'cmd /C start ...' > >Why? Aren't your default ComSpec isn't CMD already? >> to start those parts of the build system in a non-blocking fashion. > >If it's (b?a|tc)?sh script - use backgrounding (The &) If it's a CMD >script - use backgrounding (START "" /B "command" args) Problem solved. >> Recently, on one of the machines which had its cygwin installation upgraded, >> I have observed that the cmd instances do not start in a non-blocking >> fashion anymore, but instead wait for the process to finish. > >> To be more precise, following the following steps should lead to two >> interactive windows, one with the sh prompt and one with the cmd prompt, >> both waiting for user input: >> 1 - start a cygwin (or sh) command window >> 2 - type "cmd /C start cmd" > >> Expected result: >> Two interactive and usable windows, one with the sh prompt, one with the cmd >> prompt, both waiting for user input. > >For new interactive windows from withing Cygwin shell - use run program. >And again, backgrounding, if necessary. >> Actual result: >> Two windows, one with sh and one with cmd, Cygwin/sh window blocked and >>waiting for the cmd window to finish.
Question #1: Why not use cygstart? The only reason I ever use cmd /c start is to use the /wait option of start, which is exactly not what you want. (Indeed, I wouldn't mind it if a --wait option was added to cygstart. Hint. Hint.) Question #1.1: Are you using the /wait option of cmd /c start? Question #2: Is there a reason that cygstart wasn't suggested earlier? (That's not intended as a criticism. I just want to know why in case there was one.) Thanks, - Barry Disclaimer: Statements made herein are not made on behalf of NIAID. -- 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
