Either the driver isn't loaded, the actual device (if any) does not exist, the device node was created with the wrong major/minor or wrong block/char type, or there is a bug in the driver. If this is a driver you wrote, I would suspect it may not have gotten properly registered when it was loaded. On Tuesday 10 February 2004 10:18, vishwas manral wrote: > Hi Jim, > > The errno value is 19, ENODEV. > > Thanks, > Vishwas > > -----Original Message----- > From: kernelnewbies-bounce@nl.linux.org > [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of Jim Bauer > Sent: Tuesday, February 10, 2004 8:30 PM > To: kernelnewbies@nl.linux.org > Subject: Re: Problem with open > > > Just to clarify things. Are you saying *errno* is 1 or just that the > return value from your open() is -1? It is errno's value that is > needed before anyone here can answer your question. > > > > --------- Original Message --------- > > DATE: Tue, 10 Feb 2004 18:47:30 > From: "Amit Limaye" <amit.limaye@patni.com> > To: <vishwas.manral@lycos.com> > > Cc: > >Vishwas maybe you already know this > >the return values of open do not give the actual error caused in the > > system the return value is just an indication that an error has > > occured on the system > >what does the errno value say ? > > > >-SIGTERM > >amit > > > >----- Original Message ----- > > From: "vishwas manral" <vishwas.manral@lycos.com> > > >To: <kernelnewbies@nl.linux.org> > >Sent: Tuesday, February 10, 2004 5:29 PM > >Subject: Re: Problem with open > > > >> Amit, > >> > >> I get the error -1 as I said, which maps to > >> #define EPERM 1 /* Operation not permitted */ > >> in error.h if I understand things correctly? > >> > >> Thanks, > >> Vishwas > >> > >> -----Original Message----- > >> From: kernelnewbies-bounce@nl.linux.org > >> [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of Amit Limaye > >> Sent: Tuesday, February 10, 2004 5:13 PM > >> To: vishwas.manral@lycos.com; kernelnewbies@nl.linux.org > >> Subject: Re: Problem with open > >> > >> > >> what error do u get value of errno > >> > >> -SIGTERM > >> amit > >> > >> ---------------------------------------------- > >> Hi folks, > >> > >> I am unable to open the device file and any help here would be > >> great. > >> > >> 1. I insert the module using insmod get the dynamic Major number > >> seeing > > > >/proc/devices. > > > >> 2. Using the major number I add the device special file using > >> mknod. > > > >mknod- m /dev/devName c 254 0. > > > >> 3. I now do an open on the device in the user space. I am unable > >> to open > > > >the file it returns -1. I tried to do open with O_RDONLY yet I get > > the same error. > > > >> Please let me know what I am doing wrong(link would be great too). > >> I > > > >checked the archives but found nothing useful. > > > >> Thanks, > >> Vishwas > >> > >> > >> -- > >> > >> --------- Original Message --------- > >> > >> DATE: Mon, 9 Feb 2004 02:36:58 > >> From: prasanna wakhare <prasannawakhare@yahoo.com> > >> To: vishwas.manral@lycos.com > >> Cc: kernelnewbies@nl.linux.org > >> > >> >hi, > >> >u confirm yrself what's this error > >> >by giving errno to strerror > >> >might be coz > >> >the file is not in existance,but u have succesfull > >> >make the mknod, > >> >if u r giving major number statically, > >> >then rather try to allot it dynamically > >> >check /proc/devices file > >> >lsmod , > >> >and rather some dependancy problem is still there > >> >then u include "sysdep.h" file of rubini > >> >which is nearly have resolved all symbols from 2.2 > >> >kernels, > >> >i given u all possibilities which i could think. > >> > > >> >--- vishwas manral <vishwas.manral@lycos.com> wrote: > >> >> Hi Prasanna, > >> >> > >> >> Going ahead from the previous after creating a > >> >> device file using mknod, if I try to do an open from > >> >> user space I get the fd as -1. > >> >> > >> >> Do let me know what you think I have done wrong? > >> >> > >> >> Thanks, > >> >> Vishwas > >> > >> ____________________________________________________________ > >> Find what you are looking for with the Lycos Yellow Pages > > > >http://r.lycos.com/r/yp_emailfooter/http://yellowpages.lycos.com/def > >ault.asp ?SRC=lycos10 > > > >> -- > >> Kernelnewbies: Help each other learn about the Linux kernel. > >> Archive: http://mail.nl.linux.org/kernelnewbies/ > >> FAQ: http://kernelnewbies.org/faq/ > > ____________________________________________________________ > Find what you are looking for with the Lycos Yellow Pages > http://r.lycos.com/r/yp_emailfooter/http://yellowpages.lycos.com/defa >ult.asp?SRC=lycos10 -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
