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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465// SPDX-License-Identifier: GPL-2.0#include <linux/fs.h>#include <linux/init.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/blkdev.h>#include "internal.h"
static int devinfo_show(struct seq_file *f, void *v){ int i = *(loff_t *) v;
if (i < CHRDEV_MAJOR_MAX) { if (i == 0) seq_puts(f, "Character devices:\n"); chrdev_show(f, i); }#ifdef CONFIG_BLOCK else { i -= CHRDEV_MAJOR_MAX; if (i == 0) seq_puts(f, "\nBlock devices:\n"); blkdev_show(f, i); }#endif return 0;}
static void *devinfo_start(struct seq_file *f, loff_t *pos){ if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) return pos; return NULL;}
static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos){ (*pos)++; if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) return NULL; return pos;}
static void devinfo_stop(struct seq_file *f, void *v){ /* Nothing to do */}
static const struct seq_operations devinfo_ops = { .start = devinfo_start, .next = devinfo_next, .stop = devinfo_stop, .show = devinfo_show};
static int __init proc_devices_init(void){ struct proc_dir_entry *pde;
pde = proc_create_seq("devices", 0, NULL, &devinfo_ops); pde_make_permanent(pde); return 0;}fs_initcall(proc_devices_init);