mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 05:33:09 +00:00
b520410654
-----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEESH4wyp42V4tXvYsjUqAMR0iAlPIFAmM8O6QACgkQUqAMR0iA lPKY2g/+M+7MZKgEGq4Nr6wLlrZ58ndp3tLEUqj5XTPdnjyCtThIgUZtKpAN8jUH tv38SmKdJ/mjVjGC83Akt+xzk+x7kBOom4+EKNTjF3gj1va7REtRQ0gjAEzSATyJ +zxWnREx7Hpy8v56R+WOFD9i6dWnQMjqPcCDstiru25pqx/WZQhyAUHVqoLXa3Cp IOhgCcSEQuWbENhwYIh1LEVqAsIagssShHMLgrAX9evZqrbSmX0yrj/o26h2ePbg rX2UJ9QXkhZEMLcH5RU8KlJdv6oMnap/Ec3DaoTrR3tOPlGTcyRrKu4LuXZlLYxK Gnrx/DbkALUksPsL4R7InEpjRmAmIX/yzF/TaY4B4Ih0g3qfdnVIQ8E6rTOd++g5 HFwfkd3KTG4ydjh3z5fqiP0py3fcuUvo5arYIgnKyy0rtER7NpI5qSzrXs47ZAXn G35L+PZiwYRZYofvUU1LGNKIhwYloL6Dxs+ztkT8kAj9B00CLduSuwHOtboG+Ga3 C9MwmbZNzAMza7f5WRrxP1h/VeJgnb6SYIoNDILYhGEISR+ndXM8/plG94pflQog +oXNNppgpHALZUQWXGeRooyC3CFqzDr/OuUrGzqE+jBtjq+HSYUV1VqNfYqcy96l QEotzXen8SXba6go+4Kt5RvPeiosPJY2zRMpShVDKCa6P4YiVQo= =xERg -----END PGP SIGNATURE----- Merge tag 'printk-for-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux Pull printk updates from Petr Mladek: - Initialize pointer hashing using the system workqueue. It avoids taking locks in printk()/vsprintf() code path - Misc code clean up * tag 'printk-for-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: printk: Mark __printk percpu data ready __ro_after_init printk: Remove bogus comment vs. boot consoles printk: Remove write only variable nr_ext_console_drivers printk: Declare log_wait properly printk: Make pr_flush() static lib/vsprintf: Initialize vsprintf's pointer hash once the random core is ready. lib/vsprintf: Remove static_branch_likely() from __ptr_to_hashval(). lib/vnsprintf: add const modifier for param 'bitmap'
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
// 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);
|