1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/fs.h> 3 #include <linux/init.h> 4 #include <linux/proc_fs.h> 5 #include <linux/seq_file.h> 6 7 static int cmdline_proc_show(struct seq_file *m, void *v) 8 { 9 seq_printf(m, "%s\n", saved_command_line); 10 return 0; 11 } 12 13 static int cmdline_proc_open(struct inode *inode, struct file *file) 14 { 15 return single_open(file, cmdline_proc_show, NULL); 16 } 17 18 static const struct file_operations cmdline_proc_fops = { 19 .open = cmdline_proc_open, 20 .read = seq_read, 21 .llseek = seq_lseek, 22 .release = single_release, 23 }; 24 25 static int __init proc_cmdline_init(void) 26 { 27 proc_create("cmdline", 0, NULL, &cmdline_proc_fops); 28 return 0; 29 } 30 fs_initcall(proc_cmdline_init); 31