Linux内核编程

Question

我要赶管道（）系统调用，所以我改变了pipe.c源代码

static pipe_hook_t pipe_hook; 
pipe_hook_t set_pipe_hook(pipe_hook_t hook) 
{ 
    pipe_hook_t old_hook = pipe_hook; 
    pipe_hook = hook; 
    printk(KERN_INFO, "pipe hook: %p", hook); 
    return old_hook; 
} 

EXPORT_SYMBOL_GPL(set_pipe_hook); 

然后我试图定义文件syscalls.h pipe_hook_t（包含在pipe.c ）

typedef void (*pipe_hook_t)(int *filedes); 
pipe_hook_t set_pipe_hook(pipe_hook_t hook); 

，我有错误：

fs/pipe.c:1130: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘pipe_hook’ 
fs/pipe.c:1131: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘set_pipe_hook’ 
fs/pipe.c:1138: error: ‘set_pipe_hook’ undeclared here (not in a function) 
fs/pipe.c:1138: warning: type defaults to ‘int’ in declaration of ‘set_pipe_hook’ 
fs/pipe.c: In function ‘sys_pipe2’: 
fs/pipe.c:1153: error: ‘pipe_hook’ undeclared (first use in this function) 
fs/pipe.c:1153: error: (Each undeclared identifier is reported only once 
fs/pipe.c:1153: error: for each function it appears in.) 
fs/pipe.c:1154: error: implicit declaration of function ‘pipe_hook’ 

我一直在努力，也创造我自己的.h文件并定义pipe_hook_t但呃ror是一样的

Answer 1

问题已解决。我只是混淆了头文件所在的目录。