52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
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/*
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procfs1.c
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/proc_fs.h>
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#include <linux/uaccess.h>
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#define procfs_name "helloworld"
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struct proc_dir_entry *Our_Proc_File;
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ssize_t procfile_read(struct file *filePointer,char *buffer,
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size_t buffer_length, loff_t * offset)
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{
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int ret=0;
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if(strlen(buffer) ==0) {
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pr_info("procfile read %s\n",filePointer->f_path.dentry->d_name.name);
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ret=copy_to_user(buffer,"HelloWorld!\n",sizeof("HelloWorld!\n"));
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ret=sizeof("HelloWorld!\n");
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}
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return ret;
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}
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static const struct proc_ops proc_file_fops = {
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.proc_read = procfile_read,
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};
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int init_module()
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{
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Our_Proc_File = proc_create(procfs_name,0644,NULL,&proc_file_fops);
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if(NULL==Our_Proc_File) {
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proc_remove(Our_Proc_File);
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pr_alert("Error:Could not initialize /proc/%s\n",procfs_name);
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return -ENOMEM;
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}
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pr_info("/proc/%s created\n", procfs_name);
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return 0;
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}
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void cleanup_module()
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{
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proc_remove(Our_Proc_File);
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pr_info("/proc/%s removed\n", procfs_name);
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}
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MODULE_LICENSE("GPL");
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