来源:http://blog.csdn.net/p_panyuch/article/details/5648007
SYSCALL_DEFINE3 在何处定义?
#define SYSCALL_DEFINE3(name, ...)
SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
#define SYSCALL_DEFINEx(x, sname, ...) /
__SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
#define __SYSCALL_DEFINEx(x, name, ...) /
asmlinkage long sys##name(__SC_DECL##x(__VA_ARGS__))
include/linux/syscalls.h, line 228
#define __SYSCALL_DEFINEx(x, name, ...) /
asmlinkage long sys##name(__SC_DECL##x(__VA_ARGS__))
#define __SC_DECL3(t3, a3, ...) t3 a3, __SC_DECL2 (__VA_ARGS__)
所以对函数定义 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 就等于
SYSCALL_DEFINEx(3, _##socket, __VA_ARGS__)
= asmlinkage long sys_socket(__SC_DECL3(__VA_ARGS__))
= asmlinkage long sys_socket(int family, __SC_DECL2(__VA_ARGS__))
最终得到
asmlinkage long sys_socket(int family, int type, int protocol)
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