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[altq 562] Re: qop_add_filter() in qop.c
Hao Zhang wrote:
> Where can I find the defination of ioctl in user space code?
It's a bit tricky to understand how system calls are translated within
libc. If you take a closer look at lib/libc/sys/Makefile.inc, you
- machine-independent syscall entries are defined in sys/sys/syscall.mk
- syscall numbers are defined in sys/sys/syscall.h
- each entry is translated to a trap instruction in assembler
by SYSCALL(x) macro in lib/libc/i386/SYS.h
But 99.9% of UNIX programmers don't need to know these details.
All you need to know is that the userland code and the kernel code are