original development tree for Linux kernel GTP module; now long in mainline.
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#include <linux/fs.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
static int cmdline_proc_show(struct seq_file *m, void *v)
seq_printf(m, "%s\n", saved_command_line);
return 0;
static int cmdline_proc_open(struct inode *inode, struct file *file)
return single_open(file, cmdline_proc_show, NULL);
static const struct file_operations cmdline_proc_fops = {
.open = cmdline_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
static int __init proc_cmdline_init(void)
proc_create("cmdline", 0, NULL, &cmdline_proc_fops);
return 0;