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https://github.com/torvalds/linux
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abaf3787ac
PROC_FS is a bool, so this code is either present or absent. It will never be modular, so using module_init as an alias for __initcall is rather misleading. Fix this up now, so that we can relocate module_init from init.h into module.h in the future. If we don't do this, we'd have to add module.h to obviously non-modular code, and that would be ugly at best. Note that direct use of __initcall is discouraged, vs. one of the priority categorized subgroups. As __initcall gets mapped onto device_initcall, our use of fs_initcall (which makes sense for fs code) will thus change these registrations from level 6-device to level 5-fs (i.e. slightly earlier). However no observable impact of that small difference has been observed during testing, or is expected. Also note that this change uncovers a missing semicolon bug in the registration of vmcore_init as an initcall. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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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 <asm/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 unsigned int 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 POLLIN | POLLRDNORM;
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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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