In the file_operations struct, it is a pointer to another function that your module/code should implement. The file_operations struct, like many others in the kernel, contains a generic set of functions that the kernel expect your code will implement.

In the proc fs for example, mounts_poll (http://lxr.linux.no/linux+v2.6.38.8/fs/proc/base.c#L639) is an implementation of the poll function that is later associated with the pointer of the file_operations structure at http://lxr.linux.no/linux+v2.6.38.8/fs/proc/base.c#L661

Take a look at the LDD (http://lwn.net/Kernel/LDD3/) to learn how a driver implementation should use these kind of functions to understand it better.

--
Henrique Rodrigues

http://www.dcc.ufmg.br/~hsr

On Fri, Jan 11, 2013 at 12:14 AM, horseriver <horserivers@gmail.com> wrote:

hi:

for a socket file point , what will this function do ?

file->f_op->poll(); ///poll is declared in the file-operations struct .

but I do not find this function's definition .

Is there some advice?

thanks!

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