Incase you recieve a signal while you are sleeping on a semaphore in the kernel mode, the process would be woken up. Now its upto you to handle. Either you can continue sleeping and wait for the I/O to complete or you break and comes out of it. Based on your implementation you would know the reason for breaking out of the semaphore, i.e if the purpose of your wait is over or if you have recieved a signal or so on. Now you can perform the respective cleanup and return the control back to the User Process. Thanks, Sumit ----- Original Message ----- From: J <jeebu19@yahoo.com> Date: Friday, March 1, 2002 4:46 pm Subject: Re: Blocking I/O and rmmod > On Thu, Feb 28, 2002 at 01:57:49PM -0600, David Stroupe wrote: > > The biggest concern that I have is that the user app crashes and > can not > > send/do anything. My driver is still hanging out trying to > service the > > blocked request. Under those circumstances I have two concerns. > What > > Your driver wait will be interrupted with signal SIGSEGV ( or > SIGBUS (?) ) > ,provided you are in interruptible wait. You clean up here and when > return user mode, application can crash. > > Regards, > Sourav > > _________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com address at http://mail.yahoo.com > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > IRC Channel: irc.openprojects.net / #kernelnewbies > Web Page: http://www.kernelnewbies.org/ > >
begin:vcard n:Agarwal;Sumit fn:Sumit Agarwal tel;cell:+919845205210 tel;fax:+91-80-5732696 tel;home:+919845205210 tel;work:+91-805732296 / 93 extn. 5243 url:www.wipro.com org:Wipro Technologies;SIDC, Embedded and Internet Division adr:;;Wipro Technologies, Chamundi Complex, No.26, Hosur Main Road, Bommanahalli;Bangalore;Karnataka;560068;INDIA version:2.1 email;internet:sumit.agarwal@wipro.com title:Senior Software Engineer end:vcard
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