On Tue, Dec 25, 2001 at 12:15:12PM +0530, Chirag Kantharia wrote: > Is there any way to access the serial port from within kernel code? I > came across this code, while googling, which is supposedly dangerous. > > > struct file *filp; > > mm_segment_t old_fs; > > filp = filp_open(name,flags,mode); > > old_fs= getfs(); > > set_fs(KERNEL_DS); > > filp->f_op->read(filp,buffer,count,&filp->f_pos); > > (from: http://mail.nl.linux.org/kernelnewbies/2001-02/msg00068.html) > > Morever, I don't have a filesystem in the kernel, and so I guess, this > won't work. Is there any other way? Sure, do it in userland. Opening and using a serial port smells like policy, and policy should always be done in userland. Erik -- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/ -- 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/
