Messages in this thread | | | Date | Tue, 17 Oct 2006 15:17:16 +0500 | From | "Irfan Habib" <> | Subject | Re: getting a return from a system call |
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and what about long? I tried return type long, it also always returned 0, instead of the custom one I was returning
On 10/17/06, Jay Vaughan <jv@access-music.de> wrote: > > You can't use floats in kernel system calls .. > > j. > > At 14:45 +0500 17/10/06, Irfan Habib wrote: > >Hi, > > > >I'm trying to build a system call which returns a float, and is defined as : > >asmlinkage float sys_ph_pinfo(int pid, int mode) > > > >but in a user level program every time, I evaluate it, I always get > >a return 0! > >How do I capture the return of a system call? > > > >Also is it possible that a system call return a structure or array? > >Will that be available in user space? My hunch is that this is not > >possible, as kernel memory space is disjoint form the user memory > >space, but just for information. > > > >Regards, > >Irfan > >- > >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > >the body of a message to majordomo@vger.kernel.org > >More majordomo info at http://vger.kernel.org/majordomo-info.html > >Please read the FAQ at http://www.tux.org/lkml/ > > > -- > > ; > > Jay Vaughan > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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