Messages in this thread | | | Date | Fri, 08 Oct 2004 17:18:40 +0200 | From | Brice Goglin <> | Subject | Re: how do you call userspace syscalls (e.g. sys_rename) from inside kernel |
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> call sys_rename, sys_pread, sys_create, sys_mknod, sys_rmdir > etc. - everything that does file access.
If you ever actually call sys_this or sys_that ... from the kernel, you'll have to do something like this to avoid copy_from/to_user to fail because the target buffer is not in kernel space:
mm_segment_t old_fs; old_fs = get_fs(); set_fs(KERNEL_DS); <do you stuff here> set_fs(old_fs);
Just look for set_fs in the kernel source to find examples. -- Brice Goglin ================================================ Ph.D Student Laboratoire de l'Informatique et du Parallélisme CNRS-ENS Lyon-INRIA-UCB Lyon France - 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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