Messages in this thread | | | Date | Fri, 12 Jan 2007 23:31:29 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: How can I create or read/write a file in linux device driver? |
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On Jan 12 2007 09:27, linux-os (Dick Johnson) wrote: > >First, since file-operations require process context, and the kernel >is not a process, you need to create a kernel thread to handle your file >I/O.
Not always. If you do file I/O as part of a device driver, you are fine. quad_dsp is such an example, where writing to /dev/Qdsp_* will trigger writes to /dev/dsp and /dev/adsp.
>Once you set up this "internal environment," you use the appropriate >kernel function(s) such as sys_open()
What against filp_open? That avoids the unnecessary getname() stuff in most syscalls.
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