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The overall structure of the hash list in kernel is shown as blow. Kernel provides some interface to build a whole hash list quickly and they are more useful. Some figures are illustrated to desrcbie how to use these function calls for the hash list.          first->pprev = &n->next;     h->first = n; Otherwise , there are  more than one nodes  at least in the list.     n->pprev = next->pprev;     n->next = next;     if(next->next)         next->next->pprev  = &next->next; It is easy to understand to expand it shown as the following. Here is an example to show  where this callback function can be used. It is useful to find out which library are loaded when running the program. From above result, it will find the file ld.so.conf to know where the standard library is located. In this case, the library I only use is glibc. So it is a simple code. But it is handy tool if your program is very complex and you want to This will define both `.text0' and `.text1' to start at address 0x1000. `.text0' will be loaded at address 0x4000, and `.text1' will be loaded immediately after `.text0'. The following symbols will be C code to copy overlay .text1 into the overlay area might look like the following. above example could have been written identically as follows. From gnu gcc docu*ent: The weak attribute causes the declaration to be emitted as a weak symbol rather than a global. This is primarily useful in defining library functions which can be overridden in user code, though it can #gcc -shared -o libweak.so weakfunc.c #gcc  -o weakfunc{,.c} -lweak -L. From above, it is very clear that the weak function of the library is replaced. However, this function is presented as  global attribute. 最近研究了Andriod，整理了一些專有名詞如 IPL (InitialProgramLoader): Initialize the hardware setting, such as memory, cpu clock , flash, about the development board. It is similar with the bootloader in the embedded system, like u-boot.