Messages in this thread | | | From | Vinesh Christopher <> | Subject | How to use sendfile with a char device driver's file descriptor | Date | Mon, 30 Jun 2003 16:07:07 -0400 |
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I have a device driver which has to sent a data through network. Currently the driver's buffer is mmaped to the user mode program which uses the standard socket sent() call.
To improve the performance and reduce CPU overhead, I tried using sendfile() Call. But it failed with EINVAL.
Browsing thru the mm/filemap.c, I found the driver has to provide a readpage functions in address_space_operations. So I added it.
Now the sendfile() does not fail, but it returns with 0 bytes sent. Also my function readpage is never called.
How can I use sendfile() with my driver? Is there any documentation available on how to add address_space_operations to a driver, so that sendfile can be used.
Any help will be appreciated
Samvinesh Christopher. - 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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