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authorDr. Werner Fink <werner@suse.de>2010-09-22 06:45:40 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 13:20:05 -0400
commitf4a3e0bceb57466c31757f25e4e0ed108d1299ec (patch)
treec08eda0100e97ebd1fe4ab90b5d8eb142e505673 /Documentation/filesystems
parenta9e2e06015201c32c43d3615c9bf5e0d4efb4302 (diff)
tty: Add a new file /proc/tty/consoles
Add a new file /proc/tty/consoles to be able to determine the registered system console lines. If the reading process holds /dev/console open at the regular standard input stream the active device will be marked by an asterisk. Show possible operations and also decode the used flags of the listed console lines. Signed-off-by: Werner Fink <werner@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/proc.txt32
1 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index a6aca8740883..98223a676940 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -1075,6 +1075,7 @@ Table 1-11: Files in /proc/tty
1075 drivers list of drivers and their usage 1075 drivers list of drivers and their usage
1076 ldiscs registered line disciplines 1076 ldiscs registered line disciplines
1077 driver/serial usage statistic and status of single tty lines 1077 driver/serial usage statistic and status of single tty lines
1078 consoles registered system console lines
1078.............................................................................. 1079..............................................................................
1079 1080
1080To see which tty's are currently in use, you can simply look into the file 1081To see which tty's are currently in use, you can simply look into the file
@@ -1093,6 +1094,37 @@ To see which tty's are currently in use, you can simply look into the file
1093 /dev/tty /dev/tty 5 0 system:/dev/tty 1094 /dev/tty /dev/tty 5 0 system:/dev/tty
1094 unknown /dev/tty 4 1-63 console 1095 unknown /dev/tty 4 1-63 console
1095 1096
1097To see which character device lines are currently used for the system console
1098/dev/console, you may simply look into the file /proc/tty/consoles:
1099
1100 > cat /proc/tty/consoles
1101 tty0 -WU (ECp) 4:7
1102 ttyS0 -W- (Ep) 4:64
1103
1104The columns are:
1105
1106 device name of the device
1107 operations R = can do read operations
1108 W = can do write operations
1109 U = can do unblank
1110 flags E = it is enabled
1111 C = it is prefered console
1112 B = it is primary boot console
1113 p = it is used for printk buffer
1114 b = it is not a TTY but a Braille device
1115 a = it is safe to use when cpu is offline
1116 * = it is standard input of the reading process
1117 major:minor major and minor number of the device separated by a colon
1118
1119If the reading process holds /dev/console open at the regular standard input
1120stream the active device will be marked by an asterisk:
1121
1122 > cat /proc/tty/consoles < /dev/console
1123 tty0 -WU (ECp*) 4:7
1124 ttyS0 -W- (Ep) 4:64
1125 > tty
1126 /dev/pts/3
1127
1096 1128
10971.8 Miscellaneous kernel statistics in /proc/stat 11291.8 Miscellaneous kernel statistics in /proc/stat
1098------------------------------------------------- 1130-------------------------------------------------