Re: Reg:flow of system call in linux

[Alan Cox]

> Can someone tell me about the flow of system call for eg. from open
> wrapper routine to sys_open() function or atleast please suggest me a
> book/website
> where I can get this info.

Userspace open() calls into glibc code
glibc does architecture dependant magic to make a syscall
The kernel syscall code does architecture dependant magic 
The kernel calls sys_open

In the x86 case the magic is basically

Load arguments into the right registers
int 0x80

then the kernel code in arch/i386/kernel/entry.S