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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364// SPDX-License-Identifier: GPL-2.0/* * linux/fs/proc/kmsg.c * * Copyright (C) 1992 by Linus Torvalds * */
#include <linux/types.h>#include <linux/errno.h>#include <linux/time.h>#include <linux/kernel.h>#include <linux/poll.h>#include <linux/proc_fs.h>#include <linux/fs.h>#include <linux/syslog.h>
#include <asm/io.h>
static int kmsg_open(struct inode * inode, struct file * file){ return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_PROC);}
static int kmsg_release(struct inode * inode, struct file * file){ (void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_PROC); return 0;}
static ssize_t kmsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ if ((file->f_flags & O_NONBLOCK) && !do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC)) return -EAGAIN; return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_PROC);}
static __poll_t kmsg_poll(struct file *file, poll_table *wait){ poll_wait(file, &log_wait, wait); if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC)) return EPOLLIN | EPOLLRDNORM; return 0;}
static const struct proc_ops kmsg_proc_ops = { .proc_flags = PROC_ENTRY_PERMANENT, .proc_read = kmsg_read, .proc_poll = kmsg_poll, .proc_open = kmsg_open, .proc_release = kmsg_release, .proc_lseek = generic_file_llseek,};
static int __init proc_kmsg_init(void){ proc_create("kmsg", S_IRUSR, NULL, &kmsg_proc_ops); return 0;}fs_initcall(proc_kmsg_init);