Andrew Lunn | 5beef3c | 2009-11-09 21:20:10 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: |
| 3 | * |
| 4 | * Marek Lindner, Simon Wunderlich |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of version 2 of the GNU General Public |
| 8 | * License as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 18 | * 02110-1301, USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include "main.h" |
| 23 | #include "log.h" |
| 24 | |
| 25 | #define LOG_BUF_MASK (log_buf_len-1) |
| 26 | #define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK]) |
| 27 | |
| 28 | static char log_buf[LOG_BUF_LEN]; |
| 29 | static int log_buf_len = LOG_BUF_LEN; |
| 30 | static unsigned long log_start; |
| 31 | static unsigned long log_end; |
| 32 | uint8_t log_level; |
| 33 | |
| 34 | static DEFINE_SPINLOCK(logbuf_lock); |
| 35 | |
| 36 | const struct file_operations proc_log_operations = { |
| 37 | .open = log_open, |
| 38 | .release = log_release, |
| 39 | .read = log_read, |
| 40 | .write = log_write, |
| 41 | .poll = log_poll, |
| 42 | }; |
| 43 | |
| 44 | static DECLARE_WAIT_QUEUE_HEAD(log_wait); |
| 45 | |
| 46 | static void emit_log_char(char c) |
| 47 | { |
| 48 | LOG_BUF(log_end) = c; |
| 49 | log_end++; |
| 50 | |
| 51 | if (log_end - log_start > log_buf_len) |
| 52 | log_start = log_end - log_buf_len; |
| 53 | } |
| 54 | |
| 55 | static int fdebug_log(char *fmt, ...) |
| 56 | { |
| 57 | int printed_len; |
| 58 | char *p; |
| 59 | va_list args; |
| 60 | static char debug_log_buf[256]; |
| 61 | unsigned long flags; |
| 62 | |
| 63 | spin_lock_irqsave(&logbuf_lock, flags); |
| 64 | va_start(args, fmt); |
| 65 | printed_len = vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, |
| 66 | args); |
| 67 | va_end(args); |
| 68 | |
| 69 | for (p = debug_log_buf; *p != 0; p++) |
| 70 | emit_log_char(*p); |
| 71 | |
| 72 | spin_unlock_irqrestore(&logbuf_lock, flags); |
| 73 | |
| 74 | wake_up(&log_wait); |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | int debug_log(int type, char *fmt, ...) |
| 80 | { |
| 81 | va_list args; |
| 82 | int retval = 0; |
| 83 | char tmp_log_buf[256]; |
| 84 | |
| 85 | /* only critical information get into the official kernel log */ |
| 86 | if (type == LOG_TYPE_CRIT) { |
| 87 | va_start(args, fmt); |
| 88 | vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args); |
| 89 | printk(KERN_ERR "batman-adv: %s", tmp_log_buf); |
| 90 | va_end(args); |
| 91 | } |
| 92 | |
| 93 | if ((type == LOG_TYPE_CRIT) || (log_level & type)) { |
| 94 | va_start(args, fmt); |
| 95 | vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args); |
| 96 | fdebug_log("[%10u] %s", (jiffies / HZ), tmp_log_buf); |
| 97 | va_end(args); |
| 98 | } |
| 99 | |
| 100 | return retval; |
| 101 | } |
| 102 | |
| 103 | int log_open(struct inode *inode, struct file *file) |
| 104 | { |
| 105 | inc_module_count(); |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | int log_release(struct inode *inode, struct file *file) |
| 110 | { |
| 111 | dec_module_count(); |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | ssize_t log_read(struct file *file, char __user *buf, size_t count, |
| 116 | loff_t *ppos) |
| 117 | { |
| 118 | int error, i = 0; |
| 119 | char c; |
| 120 | unsigned long flags; |
| 121 | |
| 122 | if ((file->f_flags & O_NONBLOCK) && !(log_end - log_start)) |
| 123 | return -EAGAIN; |
| 124 | |
| 125 | if ((!buf) || (count < 0)) |
| 126 | return -EINVAL; |
| 127 | |
| 128 | if (count == 0) |
| 129 | return 0; |
| 130 | |
| 131 | if (!access_ok(VERIFY_WRITE, buf, count)) |
| 132 | return -EFAULT; |
| 133 | |
| 134 | error = wait_event_interruptible(log_wait, (log_start - log_end)); |
| 135 | |
| 136 | if (error) |
| 137 | return error; |
| 138 | |
| 139 | spin_lock_irqsave(&logbuf_lock, flags); |
| 140 | |
| 141 | while ((!error) && (log_start != log_end) && (i < count)) { |
| 142 | c = LOG_BUF(log_start); |
| 143 | |
| 144 | log_start++; |
| 145 | |
| 146 | spin_unlock_irqrestore(&logbuf_lock, flags); |
| 147 | |
| 148 | error = __put_user(c, buf); |
| 149 | |
| 150 | spin_lock_irqsave(&logbuf_lock, flags); |
| 151 | |
| 152 | buf++; |
| 153 | i++; |
| 154 | |
| 155 | } |
| 156 | |
| 157 | spin_unlock_irqrestore(&logbuf_lock, flags); |
| 158 | |
| 159 | if (!error) |
| 160 | return i; |
| 161 | |
| 162 | return error; |
| 163 | } |
| 164 | |
| 165 | ssize_t log_write(struct file *file, const char __user *buf, size_t count, |
| 166 | loff_t *ppos) |
| 167 | { |
| 168 | return count; |
| 169 | } |
| 170 | |
| 171 | unsigned int log_poll(struct file *file, poll_table *wait) |
| 172 | { |
| 173 | poll_wait(file, &log_wait, wait); |
| 174 | |
| 175 | if (log_end - log_start) |
| 176 | return POLLIN | POLLRDNORM; |
| 177 | |
| 178 | return 0; |
| 179 | } |