Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / proc / kmsg.c

diff --git a/kernel/fs/proc/kmsg.c b/kernel/fs/proc/kmsg.c
new file mode 100644 (file)
index 0000000..05f8dcd
--- /dev/null
+++ b/kernel/fs/proc/kmsg.c
@@ -0,0 +1,64 @@
+/*
+ *  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/uaccess.h>
+#include <asm/io.h>
+
+extern wait_queue_head_t log_wait;
+
+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 unsigned int 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 POLLIN | POLLRDNORM;
+       return 0;
+}
+
+
+static const struct file_operations proc_kmsg_operations = {
+       .read           = kmsg_read,
+       .poll           = kmsg_poll,
+       .open           = kmsg_open,
+       .release        = kmsg_release,
+       .llseek         = generic_file_llseek,
+};
+
+static int __init proc_kmsg_init(void)
+{
+       proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
+       return 0;
+}
+fs_initcall(proc_kmsg_init);