实验测试结果

[Tekkaman2440@SBC2440V4]#cd /lib/modules/
[Tekkaman2440@SBC2440V4]#insmod pipe.ko
[Tekkaman2440@SBC2440V4]#cat /proc/devices
Character devices:
  1 mem
  2 pty
  3 ttyp
  4 /dev/vc/0
  4 tty
  4 ttyS
  5 /dev/tty
  5 /dev/console
  5 /dev/ptmx
  7 vcs
 10 misc
 13 input
 14 sound
 81 video4linux
 89 i2c
 90 mtd
116 alsa
128 ptm
136 pts
180 usb
189 usb_device
204 s3c2410_serial
252 pipe
253 usb_endpoint
254 rtc

Block devices:
  1 ramdisk
256 rfd
  7 loop
 31 mtdblock
 93 nftl
 96 inftl
179 mmc
[Tekkaman2440@SBC2440V4]#cd /dev/
[Tekkaman2440@SBC2440V4]#
[Tekkaman2440@SBC2440V4]#cd /tmp/
[Tekkaman2440@SBC2440V4]#./pipe_test &
[Tekkaman2440@SBC2440V4]#open scullpipe0 !
open scullpipe1 !
 SCULL_P_IOCTSIZE : scull_p_buffer0=21 !
 SCULL_P_IOCTSIZE : scull_p_buffer1=21 !
close pipetest0 !
close pipetest1 !
reopen scullpipe0 !
reopen scullpipe1 !

[Tekkaman2440@SBC2440V4]#echo 12345678901234567890 > /dev/scullpipe0
[Tekkaman2440@SBC2440V4]#read from pipetest0 code=20
[0]=1 [1]=2 [2]=3 [3]=4 [4]=5
[5]=6 [6]=7 [7]=8 [8]=9 [9]=0
[10]=1 [11]=2 [12]=3 [13]=4 [14]=5
[15]=6 [16]=7 [17]=8 [18]=9 [19]=0
read from pipetest0 code=1
[0]=
 [1]=2 [2]=3 [3]=4 [4]=5
[5]=6 [6]=7 [7]=8 [8]=9 [9]=0
[10]=1 [11]=2 [12]=3 [13]=4 [14]=5
[15]=6 [16]=7 [17]=8 [18]=9 [19]=0

[Tekkaman2440@SBC2440V4]#echo 12345678901234 > /dev/scullpipe1
[Tekkaman2440@SBC2440V4]#read from pipetest1 code=15
[0]=1 [1]=2 [2]=3 [3]=4 [4]=5
[5]=6 [6]=7 [7]=8 [8]=9 [9]=0
[10]=1 [11]=2 [12]=3 [13]=4 [14]=
[15]=6 [16]=7 [17]=8 [18]=9 [19]=0

[Tekkaman2440@SBC2440V4]#ps
  PID Uid VSZ Stat Command
    1 root 1744 S init
    2 root SW< [kthreadd]
    3 root SWN [ksoftirqd/0]
    4 root SW< [watchdog/0]
    5 root SW< [events/0]
    6 root SW< [khelper]
   59 root SW< [kblockd/0]
   60 root SW< [ksuspend_usbd]
   63 root SW< [khubd]
   65 root SW< [kseriod]
   77 root SW [pdflush]
   78 root SW [pdflush]
   79 root SW< [kswapd0]
   80 root SW< [aio/0]
  707 root SW< [mtdblockd]
  708 root SW< [nftld]
  709 root SW< [inftld]
  710 root SW< [rfdd]
  742 root SW< [kpsmoused]
  751 root SW< [kmmcd]
  769 root SW< [rpciod/0]
  778 root 1752 S -sh
  779 root 1744 S init
  781 root 1744 S init
  783 root 1744 S init
  785 root 1744 S init
  796 root 1344 S ./pipe_test
  797 root 1744 R ps
[Tekkaman2440@SBC2440V4]#./asynctest &
[Tekkaman2440@SBC2440V4]#echo 12345678901234 > /dev/scullpipe0
[Tekkaman2440@SBC2440V4]#12345678901234
close pipetest0 !
exit !

[2] + Done ./asynctest
[Tekkaman2440@SBC2440V4]#cat /proc/scullpipe
Default buffersize is 21

Device 0: c3e18494
   Queues: c04f1c34 c04f1c34
   Buffer: c3dc6c08 to c3dc6c1d (21 bytes)
   rp c3dc6c17 wp c3dc6c17
   readers 1 writers 0

Device 1: c3e18528
   Queues: c04f1c6c c04f1c6c
   Buffer: c3dc6b38 to c3dc6b4d (21 bytes)
   rp c3dc6b47 wp c3dc6b47
   readers 1 writers 0

Device 2: c3e185bc
   Queues: c3e185bc c3e185bc
   Buffer: 00000000 to 00000000 (0 bytes)
   rp 00000000 wp 00000000
   readers 0 writers 0

Device 3: c3e18650
   Queues: c3e18650 c3e18650
   Buffer: 00000000 to 00000000 (0 bytes)
   rp 00000000 wp 00000000
   readers 0 writers 0