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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a9a08845e9
This is the mindless scripted replacement of kernel use of POLL*
variables as described by Al, done by this script:
for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
done
with de-mangling cleanups yet to come.
NOTE! On almost all architectures, the EPOLL* constants have the same
values as the POLL* constants do. But they keyword here is "almost".
For various bad reasons they aren't the same, and epoll() doesn't
actually work quite correctly in some cases due to this on Sparc et al.
The next patch from Al will sort out the final differences, and we
should be all done.
Scripted-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/proc/kmsg.c
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*
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* Copyright (C) 1992 by Linus Torvalds
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*
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/poll.h>
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#include <linux/proc_fs.h>
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#include <linux/fs.h>
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#include <linux/syslog.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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extern wait_queue_head_t log_wait;
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static int kmsg_open(struct inode * inode, struct file * file)
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{
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return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_PROC);
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}
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static int kmsg_release(struct inode * inode, struct file * file)
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{
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(void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_PROC);
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return 0;
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}
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static ssize_t kmsg_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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if ((file->f_flags & O_NONBLOCK) &&
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!do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
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return -EAGAIN;
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return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_PROC);
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}
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static __poll_t kmsg_poll(struct file *file, poll_table *wait)
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{
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poll_wait(file, &log_wait, wait);
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if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
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return EPOLLIN | EPOLLRDNORM;
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return 0;
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}
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static const struct file_operations proc_kmsg_operations = {
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.read = kmsg_read,
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.poll = kmsg_poll,
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.open = kmsg_open,
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.release = kmsg_release,
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.llseek = generic_file_llseek,
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};
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static int __init proc_kmsg_init(void)
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{
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proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
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return 0;
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}
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fs_initcall(proc_kmsg_init);
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