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Linux/fs/proc/kmsg.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/fs/proc/kmsg.c
  4  *
  5  *  Copyright (C) 1992  by Linus Torvalds
  6  *
  7  */
  8 
  9 #include <linux/types.h>
 10 #include <linux/errno.h>
 11 #include <linux/time.h>
 12 #include <linux/kernel.h>
 13 #include <linux/poll.h>
 14 #include <linux/proc_fs.h>
 15 #include <linux/fs.h>
 16 #include <linux/syslog.h>
 17 
 18 #include <linux/uaccess.h>
 19 #include <asm/io.h>
 20 
 21 extern wait_queue_head_t log_wait;
 22 
 23 static int kmsg_open(struct inode * inode, struct file * file)
 24 {
 25         return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_PROC);
 26 }
 27 
 28 static int kmsg_release(struct inode * inode, struct file * file)
 29 {
 30         (void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_PROC);
 31         return 0;
 32 }
 33 
 34 static ssize_t kmsg_read(struct file *file, char __user *buf,
 35                          size_t count, loff_t *ppos)
 36 {
 37         if ((file->f_flags & O_NONBLOCK) &&
 38             !do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
 39                 return -EAGAIN;
 40         return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_PROC);
 41 }
 42 
 43 static __poll_t kmsg_poll(struct file *file, poll_table *wait)
 44 {
 45         poll_wait(file, &log_wait, wait);
 46         if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
 47                 return EPOLLIN | EPOLLRDNORM;
 48         return 0;
 49 }
 50 
 51 
 52 static const struct file_operations proc_kmsg_operations = {
 53         .read           = kmsg_read,
 54         .poll           = kmsg_poll,
 55         .open           = kmsg_open,
 56         .release        = kmsg_release,
 57         .llseek         = generic_file_llseek,
 58 };
 59 
 60 static int __init proc_kmsg_init(void)
 61 {
 62         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 63         return 0;
 64 }
 65 fs_initcall(proc_kmsg_init);
 66 

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