Changes between Version 6 and Version 7 of jazz/jfbterm

Timestamp:

Feb 2, 2009, 2:13:09 AM (17 years ago)

Author:

jazz

Comment:

--

jazz/jfbterm

@@ -445 +445 @@
 
  * [wiki:jazz/09-02-01 09-02-01@GMT+8 原紀錄 BUGFIX: jfbterm (5)]
+{{{
+#!C
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <linux/fb.h>       // include frame buffer header files
+#include <sys/ioctl.h>
+
+int main(void)
+{
+  int fbfd = 0 ;            // frame buffer file description
+
+  /* Get device independent unchangeable information about a frame buffer
+   * device and a specific video mode by FBIOGET_FSCREENINFO ioctl. */
+  struct  fb_fix_screeninfo finfo;
+
+  fbfd = open( "/dev/fb0" , O_RDWR );
+  if ( !fbfd )
+  {
+    printf( "Error: cannot open framebuffer device.\n" );
+    exit(1);
+  }
+  printf("The framebuffer device was opened successfully.\n");
+
+  /* Get fixed screen information */
+  if ( ioctl ( fbfd ,  FBIOGET_FSCREENINFO , &finfo )  )
+  {
+    printf("Error reading fixed screen information.\n");
+    exit(2);
+  } else {
+    printf("Succesfully Read the Fixed Screen Information\n");
+  }
+
+  printf("fb_fix_screeninfo.smem_len = %d\n", finfo.smem_len);
+  printf("fb_fix_screeninfo.mmio_len = %d\n", finfo.mmio_len);
+}
+}}}
+
+ * 在 Ubuntu Intrepid 上執行結果
+{{{
+root@intrepid:~# uname -a
+Linux intrepid 2.6.27-7-server #1 SMP Tue Nov 4 20:16:57 UTC 2008 x86_64 GNU/Linux
+root@intrepid:~# ./fbinfo
+The framebuffer device was opened successfully.
+Succesfully Read the Fixed Screen Information
+fb_fix_screeninfo.smem_len = 16777216
+fb_fix_screeninfo.mmio_len = 0
+}}}
+ * 以下是在 Debian Sarge 上執行結果，值得一提的是 jfbterm 在 2.6.8 核心上可以正常執行。(不過還有字型問題需要調整)
+{{{
+root@wsu-admin:~# uname -a
+Linux wsu-admin 2.6.8-2-386 #1 Tue Aug 16 12:46:35 UTC 2005 i686 GNU/Linux
+root@wsu-admin:~# ./fbinfo
+The framebuffer device was opened successfully.
+Succesfully Read the Fixed Screen Information
+fb_fix_screeninfo.smem_len = 65536
+fb_fix_screeninfo.mmio_len = 0
+}}}
+{{{
+root@wsu-admin:~# jfbterm
+jfbterm - Kanji on framebuffer console Version 0.4.7
+       Copyright (C) 2003 Fumitoshi UKAI
+        Copyright (C) 1999-2000 Noritoshi Masuichi
+This program is based on KON2
+        Copyright (C) 1992-1996 Takashi MANABE
+
+(**) : Configuration file `/etc/jfbterm.conf'
+.... 略 ....
+exec : /bin/bash ioctl FBIOGET_CON2FBMAP: Invalid argument
+color 0 : 0, 0
+color 1 : 2a, 2a
+color 2 : 2a, 2a
+color 3 : 2a, 2a
+color 4 : 2a, 2a
+color 5 : 2a, 2a
+color 6 : 2a, 2a
+color 7 : 2a, 2a
+color 8 : 15, 15
+color 9 : 3f, 3f
+color 10 : 3f, 3f
+color 11 : 3f, 3f
+color 12 : 3f, 3f
+color 13 : 3f, 3f
+color 14 : 3f, 3f
+color 15 : 3f, 3f
+}}}
+ * 以下是在 Debian Etch 上執行結果，有趣的是 jfbterm 0.4.7-7 在 2.6.18-4 上執行，縱使有 cannot mmap(mmio) : Invalid argument 的錯誤訊息，但仍舊可以正常進入 jfbterm 的環境。
+{{{
+root@etch:~# uname -a
+Linux etch 2.6.18-4-686 #1 SMP Wed May 9 23:03:12 UTC 2007 i686 GNU/Linux
+root@etch:~# ./fbinfo
+The framebuffer device was opened successfully.
+Succesfully Read the Fixed Screen Information
+fb_fix_screeninfo.smem_len = 1920000
+fb_fix_screeninfo.mmio_len = 0
+}}}
+{{{
+root@etch:~# jfbterm
+jfbterm - Kanji on framebuffer console Version 0.4.7
+       Copyright (C) 2003 Fumitoshi UKAI
+        Copyright (C) 1999-2000 Noritoshi Masuichi
+This program is based on KON2
+        Copyright (C) 1992-1996 Takashi MANABE
+
+(**) : Configuration file `/etc/jfbterm.conf'
+... 略 ...
+exec : /bin/bash color 0 : 0, 0
+color 1 : 15, 15
+color 2 : 540, 540
+color 3 : 555, 555
+color 4 : a800, a800
+color 5 : a815, a815
+color 6 : ad40, ad40
+color 7 : ad55, ad55
+color 8 : 52aa, 52aa
+color 9 : 52bf, 52bf
+color 10 : 57ea, 57ea
+color 11 : 57ff, 57ff
+color 12 : faaa, faaa
+color 13 : fabf, fabf
+color 14 : ffea, ffea
+color 15 : ffff, ffff
+cannot mmap(mmio) : Invalid argument
+}}}
+ * 為了測試 jfbterm 的中文相容性，我們寫了一隻簡單的 script
+{{{
+#!sh
+#!/bin/bash
+echo " TEST 中文測試 "
+echo "Press Any Key to continue!"
+read
+}}}
+ * 在 Ubutnu intriped 的 tty1 上執行 jfbterm -f /etc/jfbterm.conf -e /root/test.sh 可以正常看到" TEST 中文測試 "字樣，但卻無法正常跳出，因此我們再來 DEBUG 一下。
+{{{
+file jfbterm
+set args -f /etc/jfbterm.conf -e /root/test.sh
+show args
+break fbcommon.c:500
+break fbcommon.c:557
+break fbcommon.c:566
+break term.c:103
+break term.c:284
+r
+c
+c
+c
+bt
+c
+bt
+p utp->ut_time
+p utp->ut_tv
+}}}
+{{{
+Breakpoint 4, tterm_final (p=0x6147c0) at term.c:103
+(gdb) bt
+#0  tterm_final (p=0x6147c0) at term.c:103
+#1  0x0000000000408adf in sigchld (sig=<value optimized out>) at term.c:82
+#2  <signal handler called>
+#3  0x00007f5dfc00f433 in select () from /lib/libc.so.6
+#4  0x0000000000408873 in tterm_start (p=0x6147c0, tn=<value optimized out>, en=<value optimized out>) at term.c:192
+#5  0x0000000000402cf2 in main (argc=<value optimized out>, argv=0x7fff049477f8) at main.c:438
+(gdb) c
+Continuing.
+
+Breakpoint 5, tterm_reset_utmp (p=<value optimized out>) at term.c:284
+(gdb) bt
+#0  tterm_reset_utmp (p=<value optimized out>) at term.c:284
+#1  0x0000000000408a50 in tterm_final (p=0xe) at term.c:103
+#2  0x0000000000408adf in sigchld (sig=<value optimized out>) at term.c:82
+#3  <signal handler called>
+#4  0x00007fa268131433 in select () from /lib/libc.so.6
+#5  0x0000000000408873 in tterm_start (p=0x6147c0, tn=<value optimized out>, en=<value optimized out>) at term.c:192
+#6  0x0000000000402cf2 in main (argc=<value optimized out>, argv=0x7fff70a69328) at main.c:438
+(gdb) p utp->ut_time
+There is no member named ut_time.
+}}}
+ * [註] utp->ut_time = utp->ut_tv.tv_sec
+{{{
+#!C
+
+< /usr/include/bits/utmp.h >
+
+ 59 /* The structure describing an entry in the user accounting database.  */
+ 60 struct utmp
+ 61 {
+ 62   short int ut_type;            /* Type of login.  */
+ 63   pid_t ut_pid;                 /* Process ID of login process.  */
+ 64   char ut_line[UT_LINESIZE];    /* Devicename.  */
+ 65   char ut_id[4];                /* Inittab ID.  */
+ 66   char ut_user[UT_NAMESIZE];    /* Username.  */
+ 67   char ut_host[UT_HOSTSIZE];    /* Hostname for remote login.  */
+ 68   struct exit_status ut_exit;   /* Exit status of a process marked
+ 69                                    as DEAD_PROCESS.  */
+ 70 /* The ut_session and ut_tv fields must be the same size when compiled
+ 71    32- and 64-bit.  This allows data files and shared memory to be
+ 72    shared between 32- and 64-bit applications.  */
+ 73 #if __WORDSIZE == 64 && defined __WORDSIZE_COMPAT32
+ 74   int32_t ut_session;           /* Session ID, used for windowing.  */
+ 75   struct
+ 76   {
+ 77     int32_t tv_sec;             /* Seconds.  */
+ 78     int32_t tv_usec;            /* Microseconds.  */
+ 79   } ut_tv;                      /* Time entry was made.  */
+ 80 #else
+ 81   long int ut_session;          /* Session ID, used for windowing.  */
+ 82   struct timeval ut_tv;         /* Time entry was made.  */
+ 83 #endif
+ 84
+ 85   int32_t ut_addr_v6[4];        /* Internet address of remote host.  */
+ 86   char __unused[20];            /* Reserved for future use.  */
+ 87 };
+
+ 94 # define ut_time        ut_tv.tv_sec
+}}}
+ * GDB 線上除錯練習
+{{{
+[tty1]
+
+root@etch:~# apt-get build-dep jfbterm
+root@etch:~# apt-get source jfbterm
+root@etch:~# apt-get install jfbterm
+root@etch:~# cd jfbterm-0.4.7
+root@etch:~/jfbterm-0.4.7# ./configure --enable-debug
+root@etch:~/jfbterm-0.4.7# make
+root@etch:~/jfbterm-0.4.7# ./jfbterm -f /etc/jfbterm.conf -e /root/test.sh
+
+[tty2]
+
+root@etch:~# gdb /root/jfbterm-0.4.7/jfbterm `pidof jfbterm`
+GNU gdb 6.4.90-debian
+Copyright (C) 2006 Free Software Foundation, Inc.
+GDB is free software, covered by the GNU General Public License, and you are
+welcome to change it and/or distribute copies of it under certain conditions.
+Type "show copying" to see the conditions.
+There is absolutely no warranty for GDB.  Type "show warranty" for details.
+This GDB was configured as "i486-linux-gnu"...Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
+
+Attaching to program: /root/jfbterm-0.4.7/jfbterm, process 7480
+Reading symbols from /lib/tls/i686/cmov/libutil.so.1...done.
+Loaded symbols for /lib/tls/i686/cmov/libutil.so.1
+Reading symbols from /lib/tls/i686/cmov/libm.so.6...done.
+Loaded symbols for /lib/tls/i686/cmov/libm.so.6
+Reading symbols from /lib/tls/i686/cmov/libc.so.6...done.
+Loaded symbols for /lib/tls/i686/cmov/libc.so.6
+Reading symbols from /lib/ld-linux.so.2...done.
+Loaded symbols for /lib/ld-linux.so.2
+Reading symbols from /lib/tls/i686/cmov/libnss_compat.so.2...done.
+Loaded symbols for /lib/tls/i686/cmov/libnss_compat.so.2
+Reading symbols from /lib/tls/i686/cmov/libnsl.so.1...done.
+Loaded symbols for /lib/tls/i686/cmov/libnsl.so.1
+Reading symbols from /lib/tls/i686/cmov/libnss_nis.so.2...done.
+Loaded symbols for /lib/tls/i686/cmov/libnss_nis.so.2
+Reading symbols from /lib/tls/i686/cmov/libnss_files.so.2...done.
+Loaded symbols for /lib/tls/i686/cmov/libnss_files.so.2
+Failed to read a valid object file image from memory.
+0xb7fea410 in ?? ()
+(gdb) break term.c:284
+Breakpoint 1 at 0x804f552: file term.c, line 284.
+(gdb) c
+Continuing.
+
+Breakpoint 1, tterm_final (p=0x8058be0) at term.c:284
+284             time(&(utp->ut_time));
+(gdb) c
+Continuing.
+
+Breakpoint 1, tterm_final (p=0x8058be0) at term.c:284
+284             time(&(utp->ut_time));
+(gdb) c
+Continuing.
+
+Program exited normally.
+}}}
+ * GDB 遠端除錯練習
+{{{
+[tty1]
+gdbserver 127.0.0.1:1234 /root/jfbterm-0.4.7/jfbterm
+[pts1]
+(gdb) target remote 127.0.0.1:1234
+}}}
+ * 在 DEBUG 的時候偶爾會看到 <value optimized out>，但是該怎麼去掉呢??
+   * [參考] http://www.cs.utk.edu/~vose/c-stuff/onlinedocs/gdb_7.html
+{{{
+The values of arguments that were not saved in their stack frames are shown as `<value optimized out>'.
+
+If you need to display the values of such optimized-out arguments, either deduce that from other variables whose values depend on the one you are interested in, or recompile without optimizations.
+}}}
+   * [作法] 在 configure 的時候加上 CFLAGS
+     * 註: 因為如果有設定 CFLAGS 的話，在 configure 裡是會直接採用我們提供的 CFLAGS。因此縱使加上 --enable-debug 也沒有用，configure 不會幫你加 -g 進去。
+{{{
+root@intrepid:~/jfbterm-0.4.7-dev# CFLAGS="-g -O0" ./configure
+}}}
+ * 繼續追為何結束時會收到 SIGSEGV 的主因
+{{{
+< 直接在 tty1 或在 screen 中執行 >
+root@intrepid:~/jfbterm-0.4.7-dev# ./jfbterm -f /etc/jfbterm.conf -e /root/test.sh
+}}}
+{{{
+root@intrepid:~/jfbterm-0.4.7-dev# gdb ./jfbterm `pidof jfbterm`
+break term.c:103
+break term.c:284
+c
+#### 直接在 tty1 不透過 screen 執行 的結果 #####
+Breakpoint 1, tterm_final (p=0x617a00) at term.c:103
+103             tterm_reset_utmp(p);
+(gdb) s
+tterm_reset_utmp (p=0x617a00) at term.c:271
+271     {
+(gdb) s
+275             tn = rindex(p->name, '/') + 4;
+(gdb) p p->name
+$1 = "/dev/pts/0", '\0' <repeats 53 times>
+#### 直接在 tty1 有透過 screen 執行 的結果 #####
+
+Breakpoint 1, tterm_final (p=0x617a00) at term.c:103
+103             tterm_reset_utmp(p);
+(gdb) s
+tterm_reset_utmp (p=0x617a00) at term.c:271
+271     {
+(gdb) s
+275             tn = rindex(p->name, '/') + 4;
+(gdb) p p->name
+$1 = "/dev/pts/1", '\0' <repeats 53 times>
+}}}
+ * manpage of getutid(3)
+{{{
+SYNOPSIS
+
+       struct utmp *getutid(struct utmp *ut);
+
+DESCRIPTION
+
+       getutid() searches forward from the current file position in  the  utmp
+       file  based  upon  ut.   If  ut->ut_type  is one of RUN_LVL, BOOT_TIME,
+       NEW_TIME, or OLD_TIME,  getutid()  will  find  the  first  entry  whose
+       ut_type  field matches ut->ut_type.  If ut->ut_type is one of INIT_PRO-
+       CESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS, getutid() will find
+       the first entry whose ut_id field matches ut->ut_id.
+
+RETURN VALUE
+       getutent(), getutid(), getutline() and pututline() return a pointer  to
+       a  struct  utmp  on  success, and NULL on failure.  This struct utmp is
+       allocated in static storage,  and  may  be  overwritten  by  subsequent
+       calls.
+
+FILES
+       /var/run/utmp  database of currently logged-in users
+       /var/log/wtmp  database of past user logins
+
+NOTES
+   Glibc Notes
+       The above functions are not thread-safe.  Glibc adds reentrant versions
+
+       #define _GNU_SOURCE    /* or _SVID_SOURCE or _BSD_SOURCE */
+       #include <utmp.h>
+
+       int getutent_r(struct utmp *ubuf, struct utmp **ubufp);
+
+       int getutid_r(struct utmp *ut,
+                     struct utmp *ubuf, struct utmp **ubufp);
+
+       int getutline_r(struct utmp *ut,
+                       struct utmp *ubuf, struct utmp **ubufp);
+
+       These  functions  are  GNU  extensions, analogs of the functions of the
+       same name without the _r suffix.  The ubuf parameter gives these  func-
+       tions  a  place to store their result.  On success they return 0, and a
+       pointer to the result is written in *ubufp.  On error  these  functions
+       return -1.
+
+}}}
+{{{
+root@intrepid:~# w
+ 02:01:29 up 5 min,  5 users,  load average: 0.75, 0.91, 0.41
+USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
+root@intrepid:~# w
+ 02:02:14 up 6 min,  5 users,  load average: 0.35, 0.78, 0.39
+USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
+root     pts/0    :tty1:S.0        01:58    1:46m  0.24s  0.21s ./jfbterm -f /etc/jfbterm.conf -e /root/test.sh ### screen 0
+root     pts/1    :tty1:S.1        01:58    3:55m  0.01s  0.01s /bin/bash                                       ### screen 1
+root     pts/3    172.21.253.1     01:59    1:19m  0.12s  0.10s gdb ./jfbterm 3833                              ### from ssh for gdb
+root     pts/2    -                01:59    1:46m  0.00s  0.21s ./jfbterm -f /etc/jfbterm.conf -e /root/test.sh ### fb created by jfbterm
+root     pts/4    172.21.253.1     02:01    0.00s  0.02s  0.00s w                                               ### from ssh for this command `w'
+}}}