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_puts(m, saved_command_line); 10 seq_putc(m, '\n'); 11 return 0; 12 } 13 14 static int cmdline_proc_open(struct inode *inode, struct file *file) 15 { 16 return single_open(file, cmdline_proc_show, NULL); 17 } 18 19 static const struct file_operations cmdline_proc_fops = { 20 .open = cmdline_proc_open, 21 .read = seq_read, 22 .llseek = seq_lseek, 23 .release = single_release, 24 }; 25 26 static int __init proc_cmdline_init(void) 27 { 28 proc_create("cmdline", 0, NULL, &cmdline_proc_fops); 29 return 0; 30 } 31 fs_initcall(proc_cmdline_init); 32