至尊逍遥权掌天下顶点:总结段错误

来源：百度文库编辑：九乡新闻网时间：2024/04/29 13:33:11

falcon@falcon:~/temp$ gcc -g -o segerr segerr.c –加-g选项查看调试信息
falcon@falcon:~/temp$ gdb ./segerr
GNU gdb 6.4-debian
Copyright 2005 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″.
(gdb) l –用l(list)显示我们的源代码
显示代码打印
01 #include 02 03 int 04 main() 05 { 06 int i = 0; 07 08 scanf (”%d”, i); /* should have used &i */ 09 printf (”%d\n”, i); 10 return 0;

(gdb) b 8 –用b(break)设置断点
Breakpoint 1 at 0×80483b7: file segerr.c, line 8.
(gdb) p i –用p(print)打印变量i的值[看到没，这里i的值是0哦]
$1 = 0
(gdb) r –用r(run)运行，直到断点处
Starting program: /home/falcon/temp/segerr
Breakpoint 1, main () at segerr.c:8
8 scanf (”%d”, i); /* should have used &i */ –[试图往地址0处写进一个值]
(gdb) n –用n(next)执行下一步
10
Program received signal SIGSEGV, Segmentation fault.
0xb7e9a1ca in _IO_vfscanf () from /lib/tls/i686/cmov/libc.so.6
(gdb) c –在上面我们接收到了SIGSEGV,然后用c(continue)继续执行
Continuing.
Program terminated with signal SIGSEGV, Segmentation 文章出处：飞诺网(www.firnow.com):http://dev.firnow.com/course/6_system/linux/Linuxjs/200875/130421.html

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