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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         dev_t dev = 0;
 33 
 34         if (con->device) {
 35                 const struct tty_driver *driver;
 36                 int index;
 37                 driver = con->device(con, &index);
 38                 if (driver) {
 39                         dev = MKDEV(driver->major, driver->minor_start);
 40                         dev += index;
 41                 }
 42         }
 43 
 44         for (a = 0; a < ARRAY_SIZE(con_flags); a++)
 45                 flags[a] = (con->flags & con_flags[a].flag) ?
 46                         con_flags[a].name : ' ';
 47         flags[a] = 0;
 48 
 49         seq_setwidth(m, 21 - 1);
 50         seq_printf(m, "%s%d", con->name, con->index);
 51         seq_pad(m, ' ');
 52         seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-',
 53                         con->write ? 'W' : '-', con->unblank ? 'U' : '-',
 54                         flags);
 55         if (dev)
 56                 seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
 57 
 58         seq_printf(m, "\n");
 59 
 60         return 0;
 61 }
 62 
 63 static void *c_start(struct seq_file *m, loff_t *pos)
 64 {
 65         struct console *con;
 66         loff_t off = 0;
 67 
 68         console_lock();
 69         for_each_console(con)
 70                 if (off++ == *pos)
 71                         break;
 72 
 73         return con;
 74 }
 75 
 76 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 77 {
 78         struct console *con = v;
 79         ++*pos;
 80         return con->next;
 81 }
 82 
 83 static void c_stop(struct seq_file *m, void *v)
 84 {
 85         console_unlock();
 86 }
 87 
 88 static const struct seq_operations consoles_op = {
 89         .start  = c_start,
 90         .next   = c_next,
 91         .stop   = c_stop,
 92         .show   = show_console_dev
 93 };
 94 
 95 static int consoles_open(struct inode *inode, struct file *file)
 96 {
 97         return seq_open(file, &consoles_op);
 98 }
 99 
100 static const struct file_operations proc_consoles_operations = {
101         .open           = consoles_open,
102         .read           = seq_read,
103         .llseek         = seq_lseek,
104         .release        = seq_release,
105 };
106 
107 static int __init proc_consoles_init(void)
108 {
109         proc_create("consoles", 0, NULL, &proc_consoles_operations);
110         return 0;
111 }
112 fs_initcall(proc_consoles_init);
113 

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