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    Annotation of /trunk/busybox/mdev.rc

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    Revision 1723 - (hide annotations) (download)
    Mon Apr 2 13:07:13 2012 UTC (12 years, 1 month ago) by niro
    File size: 2894 byte(s) 
    -do not mount /dev if already mounted, and fixed mount options (mount as dev and use 10MB)
    1 niro 1113 #!/bin/sh
    2     # $Header: /root/magellan-cvs/src/busybox/mdev.rc,v 1.1 2010-08-22 16:43:06 niro Exp $
    3    
    4     seed_dev()
    5     {
    6     # seed /dev with some things that we know we need
    7     rc_print " Seeding /dev with needed nodes ..."
    8     (
    9     [ ! -c /dev/console ] && mknod /dev/console c 5 1
    10     [ ! -c /dev/tty1 ] && mknod /dev/tty1 c 4 1
    11     [ ! -c /dev/null ] && mknod /dev/null c 1 3
    12    
    13     # create kmsg too, so udev can add its start-message to dmesg
    14     [ -c /dev/kmsg ] || mknod -m 660 /dev/kmsg c 1 11
    15    
    16     # copy over any persistant things
    17     if [[ -d /lib/udev/devices ]]
    18     then
    19     cp -RPp /lib/udev/devices/* /dev 2>/dev/null
    20     fi
    21    
    22     # not provided by sysfs but needed
    23     ln -snf /proc/self/fd /dev/fd
    24     ln -snf fd/0 /dev/stdin
    25     ln -snf fd/1 /dev/stdout
    26     ln -snf fd/2 /dev/stderr
    27     [[ -e /proc/kcore ]] && ln -snf /proc/kcore /dev/core
    28    
    29     # create problematic directories
    30     mkdir -p /dev/pts /dev/shm
    31     )
    32     evaluate_retval
    33     }
    34    
    35 niro 1235 # This works for 2.6.15 kernels or greater
    36     trigger_uevents()
    37     {
    38     local list=""
    39     local i
    40     local first
    41     local last
    42     local default
    43    
    44     # if you want real coldplug (with all modules being loaded for all
    45     # devices in the system), uncomment out the next line.
    46 niro 1236 list="${lis}t $(echo /sys/bus/*/devices/*/uevent)"
    47 niro 1235 list="${list} $(echo /sys/class/*/*/uevent)"
    48     list="${list} $(echo /sys/block/*/uevent /sys/block/*/*/uevent)"
    49     for i in ${list}
    50     do
    51     case "${i}" in
    52     */device/uevent)
    53     # skip followed device symlinks
    54     continue
    55     ;;
    56     */class/mem/*|*/class/tty/*)
    57     first="${first} ${i}"
    58     ;;
    59     */block/md*)
    60     last="${last} ${i}"
    61     ;;
    62     */*)
    63     default="${default} ${i}"
    64     ;;
    65     esac
    66     done
    67    
    68     # trigger the sorted events
    69     for i in ${first} ${default} ${last}
    70     do
    71     echo "add" > "${i}"
    72     done
    73     }
    74    
    75 niro 1113 # main functions
    76     start_devicemanager()
    77     {
    78     # create a ramdisk for populating mdev
    79 niro 1723 if [[ -z $(grep '[[:space:]]/dev[[:space:]]' /proc/mounts | cut -d ' ' -f2) ]]
    80     then
    81     rc_print "Mounting mdev at /dev ..."
    82     # many video drivers needed exec access
    83     fstype=ramfs
    84     # tmpfs was suggested by Greg Kroah-Hartman
    85     kernel_supports_fs tmpfs && fstype=tmpfs
    86     # mount devtmpfs if supported
    87     kernel_supports_fs devtmpfs && fstype=devtmpfs
    88     mount -n -t ${fstype} dev /dev -o exec,nosuid,mode=0755,size=10M
    89     evaluate_retval
    90     fi
    91 niro 1113
    92 niro 1722 # other needed device nodes with mdev
    93 niro 1113 seed_dev
    94    
    95     if [ -e /proc/sys/kernel/hotplug ]
    96     then
    97     rc_print " Using mdev for hotplug events ..."
    98     echo "/sbin/mdev" > /proc/sys/kernel/hotplug
    99     evaluate_retval
    100     else
    101     rc_print ${COLYELLOW}" Kernel was not compiled with hotplug support !"
    102     print_status failure
    103     fi
    104    
    105     # load unix domain sockets if built as module
    106     if [ -e /proc/modules ]
    107     then
    108     modprobe -q unix 2>/dev/null
    109     fi
    110    
    111 niro 1235 rc_print " Populating /dev with existing devices through uevents ..."
    112     trigger_uevents
    113    
    114 niro 1113 rc_print " Starting mdev ..."
    115     /sbin/mdev -s
    116     evaluate_retval
    117    
    118     # same thing as /dev/.devfsd
    119     touch /dev/.mdev
    120     }
    121    
    122     stop_devicemanager()
    123     {
    124     return 0
    125     }