$ gcc -g -o segerr segerr.c        --加-g选项查看调试信息 $ gdb ./segerr (gdb) l                    --用l(list)显示我们的源代码 1       ＃i nclude 2 3       int 4       main() 5       { 6               int i = 0; 7 8               scanf ("%d", i);  9               printf ("%d\n", i); 10              return 0; (gdb) b 8                --用b(break)设置断点 Breakpoint 1 at 0x80483b7: 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);  --[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 fault. The program no longer exists. (gdb) quit        --退出gdb