1 #include <linux/fs.h> 2 #include <linux/init.h> 3 #include <linux/proc_fs.h> 4 #include <linux/seq_file.h> 5 6 static int cmdline_proc_show(struct seq_file *m, void *v) 7 { 8 seq_printf(m, "%s\n", saved_command_line); 9 return 0; 10 } 11 12 static int cmdline_proc_open(struct inode *inode, struct file *file) 13 { 14 return single_open(file, cmdline_proc_show, NULL); 15 } 16 17 static const struct file_operations cmdline_proc_fops = { 18 .open = cmdline_proc_open, 19 .read = seq_read, 20 .llseek = seq_lseek, 21 .release = single_release, 22 }; 23 24 static int __init proc_cmdline_init(void) 25 { 26 proc_create("cmdline", 0, NULL, &cmdline_proc_fops); 27 return 0; 28 } 29 fs_initcall(proc_cmdline_init); 30