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/default.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/default.asp?SRC=lycos10 -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
