HI Robert, On Mon, Jun 29, 2009 at 12:56 AM, Robert P. J. Day<rpjday@xxxxxxxxxxxxxx> wrote: > > poking around with the details of what happens when you try to load > a module that returns a negative error value, and it's not obvious how > (or if) you can examine the actual error code back in user space. > > for example, in my module init() routine, if i realize an error has > occurred, i can return the appropriate error code, such as, say, > > return -EIO; > > if that's the error that occurs, then what i get back in user space > when i try to insmod is: > > # insmod hi.ko > insmod: error inserting 'hi.ko': -1 Input/output error > # > > now, that's moderately useful since insmod at least tells me it's an > "Input/output error" to match the error code. but i don't see a way > to examine the actual numeric code, if that's what i wanted. > > if i check the shell return code variable $?, no matter what error > is returned from the module init() routine, $? will always contain 1. > i don't see an easy way to, from user space, get the actual number, > although i'm sure the argument is that that value is more meant for > kernel space and you shouldn't be asking for it back in user space > anyway. > I think your assumption holds true here. > thoughts? > > rday > -- > > ======================================================================== > Robert P. J. Day Waterloo, Ontario, CANADA > > Linux Consulting, Training and Annoying Kernel Pedantry. > > Web page: http://crashcourse.ca > Linked In: http://www.linkedin.com/in/rpjday > Twitter: http://twitter.com/rpjday > ======================================================================== > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Regards, Sandeep. “To learn is to change. Education is a process that changes the learner.” -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
