RE: Cannot get ^Z to suspend a program
Job control and signals for Cygwin processes are areas pretty internal to Cygwin. they are also pretty complex. IMO, it's hard to talk much about adding some feature to them without the context of what's already there. If you can put your suggestions in that context, I expect you'll get better feedback. Even if that's not the case, you'll be in a better position to evaluate your own ideas given the current architecture. Just my $.02. Larry Original Message: - From: linda w \(cyg\) [EMAIL PROTECTED] Date: Tue, 11 Feb 2003 21:18:05 -0800 To: [EMAIL PROTECTED] Subject: RE: Cannot get ^Z to suspend a program Sure, but those programs hook the key(s) in a global fashion, not just from individual programs. So, Cygwin could hook the Ctrl+Z key, but what would it do then, how would it know which process to suspend? I'm not sure that cygwin could 'suspend' a non-cygwin process even if it wanted to. --- started playing around with this...I note: cygjob kill -STOP %1 #works as expected but winprog kill -STOP %1 #laughs at my puny attempts to stop it So cygjobs seem to be suspendable but winjobs are already not playing fair! now I try this: while :; do sleep 3; echo 1;done # control-z ignored Also, though, I note that if I type while the program is running, say ls, then press control-c, ls still executes! Under lnx, I see the 'ls' characters echoed as soon as I type them -- it appears readline is running in foreground even though I have a job (the while loop) running in foreground as well. It's like even when a foreground job is running, there is a 2nd, system level process that also runs and processes key presses (allowing processing control-u and control-r, among other, readline functions). It _seems_ like to get similar functionality on cygwin, one might have to have the same -- perhaps a unix-like fork/exec/wait would translate, internally, to a windows fork/exec/select, where select waits for keyboard input or the child process to end. Then the win-parent process -- still in control, could process line editing and user-job control key presses -- since we know that, at least, cygwin programs are well behaved in regards to respecting a kill -STOP, the win-parent keyboard monitor thread could use the same means to STOP a child. As for job control of winjobs? Guess that'd be another whole pain in the butt. Though maybe if the running user has 'debug' privs, they could attach the process and suspend it that way? (Dunno) If their could be some way of suspending winjobs, though, then the above 'keyboard thread' method could be used to implement job control. Wha'd'ya think? -linda -- 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/ mail2web - Check your email from the web at http://mail2web.com/ . -- 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/
RE: Cannot get ^Z to suspend a program
Job control and signals for Cygwin processes are areas pretty internal to Cygwin. they are also pretty complex. IMO, it's hard to talk much about adding some feature to them without the context of what's already there. If you can put your suggestions in that context, I expect you'll get better feedback. Even if that's not the case, you'll be in a better position to evaluate your own ideas given the current architecture. --- I'm familiar with that logic, however, in a 'design' phase, it's sometimes useful to forget about what is and only look at the end result of what is wanted. If one limits one's thinking based on the current design, one might never come up with ideas that would be precluded by the current design. It's more of a wish list exercise than a request to actually go fix something so that if someone was working on those areas or did in the not too distant future, they could, perhaps, be mindful of what might be, desirable, behavior. It's like that saying about when your are up to your neck in alligators, its difficult to remember that your original objective was to drain the swamp. :-) -l -- 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/
RE: Cannot get ^Z to suspend a program
Sure, but those programs hook the key(s) in a global fashion, not just from individual programs. So, Cygwin could hook the Ctrl+Z key, but what would it do then, how would it know which process to suspend? I'm not sure that cygwin could 'suspend' a non-cygwin process even if it wanted to. --- started playing around with this...I note: cygjob kill -STOP %1 #works as expected but winprog kill -STOP %1 #laughs at my puny attempts to stop it So cygjobs seem to be suspendable but winjobs are already not playing fair! now I try this: while :; do sleep 3; echo 1;done # control-z ignored Also, though, I note that if I type while the program is running, say ls, then press control-c, ls still executes! Under lnx, I see the 'ls' characters echoed as soon as I type them -- it appears readline is running in foreground even though I have a job (the while loop) running in foreground as well. It's like even when a foreground job is running, there is a 2nd, system level process that also runs and processes key presses (allowing processing control-u and control-r, among other, readline functions). It _seems_ like to get similar functionality on cygwin, one might have to have the same -- perhaps a unix-like fork/exec/wait would translate, internally, to a windows fork/exec/select, where select waits for keyboard input or the child process to end. Then the win-parent process -- still in control, could process line editing and user-job control key presses -- since we know that, at least, cygwin programs are well behaved in regards to respecting a kill -STOP, the win-parent keyboard monitor thread could use the same means to STOP a child. As for job control of winjobs? Guess that'd be another whole pain in the butt. Though maybe if the running user has 'debug' privs, they could attach the process and suspend it that way? (Dunno) If their could be some way of suspending winjobs, though, then the above 'keyboard thread' method could be used to implement job control. Wha'd'ya think? -linda -- 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/
Re: Cannot get ^Z to suspend a program
On Mon, Feb 10, 2003 at 10:26:36AM -0800, Samir Gupta wrote: I am using cygwin under windows xp pro and under windows 2000 pro, and cannot get the ^Z to suspend a program that I have opened. note that I normally use tcsh, but I also experience the same problem using bash... Can't duplicate it here. If I set CYGWIN=tty prior to starting bash and then type: c:\bash bash$ sleep 20 bash$ CTRL-Z it suspends the sleep. cgf -- 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/
Re: Cannot get ^Z to suspend a program
thanks for the reply: I was trying to use CTRL-Z after opening up a windows program (such as emacs -- the windows version or excel) Suspend will work if I perform it on the sleep command. 1 sleep 20 Suspended 2 Why won't it suspend If I type the following: 1 emacs [1] 1668 2 emacs The first command opens up my emacs (for windows) program and runs it in the background (so I can still use the prompt). So, I assume if this capability is there, then it should also be able to put it in the background after I have already opened it. However, when I type the second command, I can't use CTRL-Z to put it in the background. Do you know why this is? Can't duplicate it here. If I set CYGWIN=tty prior to starting bash and then type: c:\bash bash$ sleep 20 bash$ CTRL-Z it suspends the sleep. cgf -- 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/
Re: Cannot get ^Z to suspend a program
Samir Gupta wrote: thanks for the reply: I was trying to use CTRL-Z after opening up a windows program (such as emacs -- the windows version or excel) Cygwin cannot control how windows programs handle CTRL+Z. -- 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/
RE: Cannot get ^Z to suspend a program
Perhaps silly question, but, why not? Cygwin cannot control how windows programs handle CTRL+Z. I have programs that seem to intercept keyboard keys for use as hotkeys. Couldn't cygwin do something similar? curious... -linda -- 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/
Re: Cannot get ^Z to suspend a program
linda w (cyg) wrote: Perhaps silly question, but, why not? Cygwin cannot control how windows programs handle CTRL+Z. I have programs that seem to intercept keyboard keys for use as hotkeys. Couldn't cygwin do something similar? curious... -linda Sure, but those programs hook the key(s) in a global fashion, not just from individual programs. So, Cygwin could hook the Ctrl+Z key, but what would it do then, how would it know which process to suspend? I'm not sure that cygwin could 'suspend' a non-cygwin process even if it wanted to. -- 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/
RE: Cannot get ^Z to suspend a program
As I understand it, 'cygwin' does not kill the program, the program kills itself on Ctrl+C. PS: please do not respond to me personally. -Original Message- From: Samir Gupta [mailto:[EMAIL PROTECTED]] Sent: Monday, February 10, 2003 8:39 PM To: Rolf Campbell Subject: RE: Cannot get ^Z to suspend a program But why can Cygwin kill the program when you type CTRL+C? -Original Message- From: Rolf Campbell [mailto:[EMAIL PROTECTED]] Sent: Monday, February 10, 2003 5:13 PM To: [EMAIL PROTECTED] Subject: Re: Cannot get ^Z to suspend a program Samir Gupta wrote: thanks for the reply: I was trying to use CTRL-Z after opening up a windows program (such as emacs -- the windows version or excel) Cygwin cannot control how windows programs handle CTRL+Z. -- 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/ -- 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/
