Linux内核编程

Question

我想捕获pipe() syscall，所以我在pipe.c中更改了源代码

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，我尝试在syscalls.h文件(包含在pipe.c中)中定义pipe_hook_t。

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

我犯了一个错误：

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’

我尝试创建自己的.h文件并在其中定义pipe_hook_t，但错误是相同的

Answer 1

问题已经解决了。我只是混淆了头文件所在的目录。