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TOMOYO Linux Cross Reference
Linux/fs/proc/consoles.c

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  1 /*
  2  * Copyright (c) 2010 Werner Fink, Jiri Slaby
  3  *
  4  * Licensed under GPLv2
  5  */
  6 
  7 #include <linux/console.h>
  8 #include <linux/kernel.h>
  9 #include <linux/proc_fs.h>
 10 #include <linux/seq_file.h>
 11 #include <linux/tty_driver.h>
 12 
 13 /*
 14  * This is handler for /proc/consoles
 15  */
 16 static int show_console_dev(struct seq_file *m, void *v)
 17 {
 18         static const struct {
 19                 short flag;
 20                 char name;
 21         } con_flags[] = {
 22                 { CON_ENABLED,          'E' },
 23                 { CON_CONSDEV,          'C' },
 24                 { CON_BOOT,             'B' },
 25                 { CON_PRINTBUFFER,      'p' },
 26                 { CON_BRL,              'b' },
 27                 { CON_ANYTIME,          'a' },
 28         };
 29         char flags[ARRAY_SIZE(con_flags) + 1];
 30         struct console *con = v;
 31         unsigned int a;
 32         int len;
 33         dev_t dev = 0;
 34 
 35         if (con->device) {
 36                 const struct tty_driver *driver;
 37                 int index;
 38                 driver = con->device(con, &index);
 39                 if (driver) {
 40                         dev = MKDEV(driver->major, driver->minor_start);
 41                         dev += index;
 42                 }
 43         }
 44 
 45         for (a = 0; a < ARRAY_SIZE(con_flags); a++)
 46                 flags[a] = (con->flags & con_flags[a].flag) ?
 47                         con_flags[a].name : ' ';
 48         flags[a] = 0;
 49 
 50         seq_printf(m, "%s%d%n", con->name, con->index, &len);
 51         len = 21 - len;
 52         if (len < 1)
 53                 len = 1;
 54         seq_printf(m, "%*c%c%c%c (%s)", len, ' ', con->read ? 'R' : '-',
 55                         con->write ? 'W' : '-', con->unblank ? 'U' : '-',
 56                         flags);
 57         if (dev)
 58                 seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
 59 
 60         seq_printf(m, "\n");
 61 
 62         return 0;
 63 }
 64 
 65 static void *c_start(struct seq_file *m, loff_t *pos)
 66 {
 67         struct console *con;
 68         loff_t off = 0;
 69 
 70         console_lock();
 71         for_each_console(con)
 72                 if (off++ == *pos)
 73                         break;
 74 
 75         return con;
 76 }
 77 
 78 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 79 {
 80         struct console *con = v;
 81         ++*pos;
 82         return con->next;
 83 }
 84 
 85 static void c_stop(struct seq_file *m, void *v)
 86 {
 87         console_unlock();
 88 }
 89 
 90 static const struct seq_operations consoles_op = {
 91         .start  = c_start,
 92         .next   = c_next,
 93         .stop   = c_stop,
 94         .show   = show_console_dev
 95 };
 96 
 97 static int consoles_open(struct inode *inode, struct file *file)
 98 {
 99         return seq_open(file, &consoles_op);
100 }
101 
102 static const struct file_operations proc_consoles_operations = {
103         .open           = consoles_open,
104         .read           = seq_read,
105         .llseek         = seq_lseek,
106         .release        = seq_release,
107 };
108 
109 static int __init proc_consoles_init(void)
110 {
111         proc_create("consoles", 0, NULL, &proc_consoles_operations);
112         return 0;
113 }
114 module_init(proc_consoles_init);
115 

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