如何解决如何根据用户请求删除 proc 条目？
通常 proc 条目在具有 __exit 属性的函数内部删除。如何根据用户要求删除它？
我已经厌倦了在写回调中调用 remove_proc_entry，但是内核在那里崩溃了。
我不能只删除模块，因为它一次管理多个 proc 条目。我只想删除我要为其“删除”的那个。
static int my_write(struct file *file,const char __user *userbuff,size_t len,loff_t *ppos)
{
struct seq_file *seqf = file->private_data;
struct *my_data = seqf->private;
char *buff;
int retval;
retval = -EINVAL;
if (!userbuff || len > PAGE_SIZE)
return -EINVAL;
buff = kzalloc((len + 1),GFP_KERNEL);
if (!buff)
return -ENOMEM;
if (copy_from_user(buff,userbuff,len))
goto out;
buff[len] = '\0';
if (!strncmp("delete",buff,6)) {
/* Cannot use remove_proc_entry inside that write callback. */
retval = 0;
}
if (!retval)
retval = len;
else
printk("Usage: echo delete > /proc/my_proc to delete that entry.\n");
return retval;
}
static const struct file_operations my_proc_fops = {
.open = my_proc_open,.read = seq_read,.write = my_write,.llseek = seq_lseek,.release = single_release,};
解决方法
谢谢！我是通过 schedule_work 完成的。
struct my_data {
/* data */
struct work_struct remove_proc_work;
};
static void remove_proc_work_handler(struct work_struct *work)
{
struct my_data *data;
data = container_of(work,struct my_data,remove_proc_work);
/* call remove_proc_entry */
}
static void init_data(struct my_data *data)
{
/* init data */
INIT_WORK(&data->remove_proc_work,remove_proc_work_handler);
}
static int my_write(struct file *file,const char __user *userbuff,size_t len,loff_t *ppos)
{
struct seq_file *seqf = file->private_data;
struct *my_data = seqf->private;
char *buff;
int retval;
retval = -EINVAL;
if (!userbuff || len > PAGE_SIZE)
return -EINVAL;
buff = kzalloc((len + 1),GFP_KERNEL);
if (!buff)
return -ENOMEM;
if (copy_from_user(buff,userbuff,len))
goto out;
buff[len] = '\0';
if (!strncmp("delete",buff,6)) {
/* Cannot use remove_proc_entry inside that write callback. */
schedule_work(&data->remove_proc_work);
retval = 0;
}
if (!retval)
retval = len;
else
printk("Usage: echo delete > /proc/my_proc to delete that entry.\n");
return retval;
}
static const struct file_operations my_proc_fops = {
.open = my_proc_open,.read = seq_read,.write = my_write,.llseek = seq_lseek,.release = single_release,};
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。
