linux创建一个proc代码示例

一个可以运行的 linux下创建proc的代码示例

最近搞了一个proc来测试kernel的一个函数，记下来，省去以后再摸索。

#include <linux/types.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>

/* TEST */
static int api_test_read_proc ( struct seq_file* seq, void* v )
{
    printk("\nthis is api read proc.\n");
    return 0;
}

static ssize_t api_test_write_proc ( struct file* file, const char* buffer,
    size_t count, loff_t* off)
{
    unsigned char tmpBuf[16] = {0};
    char *token, *cp = tmpBuf;
    int len = (count > 15) ? 15 : count;
    int32 number1, number2;
    
    if (buffer && !copy_from_user(tmpBuf, buffer, len))
    {
        token = strsep(&cp, " \n");
        number1 = simple_strtoul(token, NULL, 16);
        token = strsep(&cp, " \n");
        number2 = simple_strtoul(token, NULL, 16);
       
        return count;
    }
    return -EFAULT;
}

static int api_test_open_proc ( struct inode* inode, struct file* file )
{
    return single_open(file, api_test_read_proc, NULL);
}

struct file_operations api_test_fop = {
    .open  = api_test_open_proc,
    .write = api_test_write_proc,
    .read = seq_read,
    .llseek = seq_lseek,
    .release = single_release,
};

static void api_test_proc_init (void)
{
    struct proc_dir_entry* dir = NULL;
    struct proc_dir_entry* api_test = NULL;

    dir = proc_mkdir("proc_dir_name", NULL);

    api_test = proc_create("proc_name", 0, dir, &api_test_fop);
    if(!api_test)
    {
        printk (KERN_EMERG "api_test, create proc failed!");
    }
}

static int __init api_test_module_init(void)
{
   api_test_proc_init();
   return 0;
}

static void __exit api_test_module_exit(void)
{
}

module_init(api_test_module_init);
module_exit(api_test_module_exit);