Linux2.6 initialization of structures in kernel (reprint)

Transferred from: http://hnniyan123.blog.chinaunix.net/uid-29917301-id-4989879.html

In the Linux2.6 version of the kernel, we can often see the definition and initialization of the following struct body. This is rarely seen in the previous C language book. The following structure comes from a part of the Linux kernel. In this struct we can see that there are normal integer variables and pointers to functions.

struct net_proto_family {    int        family;     int        (*create) (structstruct socket *sock,                 intint  kern);     struct Module    *owner;};

In the kernel, the following methods can be used for initialization.

Static Const struct net_proto_family netlink_family_ops = {    = Pf_netlink,    = netlink_create ,    . Owner    = this_module,/    **/};

Here is a small program that uses the structure above, and there is another application in the structure:

#include <stdio.h>#definePF_ID 10enum{ID1=Ten, ID2, ID3,};Char*message ="message";intCreateintFdChar*name) {    if(FD = =Ten) {printf ("I am Create fd =%d,name =%s\n", Fd,name); }    return 1;}intOutput (intFdChar*name) {printf ("I am Output fd =%d,name =%s\n", Fd,name); return 1;}intOutput_2 (intFdChar*name) {printf ("I am output_2 fd =%d,name =%s\n", Fd,name);}structtest_1{int(*output) (intFdChar*name);};structtest{intID; Charname[ -]; int(*print) (intFdChar*name);};Static structTest des ={. ID=pf_id,. Name="Frank",. Print=Create,};structTest_1 table[] ={[ID1]= {. Output =output}, [ID2]= {. Output =output_2},};intMain () {printf ("des. pf_id=%d\n", des.id); printf ("des.message=%s\n", Des.name);    Des.print (Pf_id,message); Table[id2].output (pf_id,"Table ID2"); Table[id1].output (pf_id,"Table ID1");}

Here is an article that analyzes the data structure of the Linux kernel in more detail.
Http://blog.csdn.net/mociml/archive/2009/08/13/4443280.aspx

Linux2.6 initialization of structures in kernel (reprint)