使用外部程序發送輸入到GDB scanf

如何使用外部程序觸發scanf時向GDB發送輸入？使用外部程序發送輸入到GDB scanf

C文件：

#include<stdio.h> 

void main() 
{ 
    int x; 
    int y; 
    printf("input x: "); 
    scanf("%d",&x); 
    printf("input y: "); 
    scanf("%d",&y); 

}

Java的外部程序：

public class Debugger extends Thread{ 

     public void run(){ 
     Process p = null; 
     try { 
     p = Runtime.getRuntime().exec("gdb a.out --interpreter=console"); 
     new Thread(new SyncPipe(p.getErrorStream(), System.err)).start(); 
     new Thread(new SyncPipe(p.getInputStream(), System.out)).start(); 
     PrintWriter stdin = new PrintWriter(p.getOutputStream()); 

     stdin.flush(); 
     stdin.println("break main"); 
     stdin.flush(); 
     stdin.println("run"); 
     stdin.flush(); 
     stdin.println("s"); 
     stdin.flush(); 
     stdin.println("45"); 
     stdin.flush(); 

     // stdin.close(); 


     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     } 
    } 

class SyncPipe implements Runnable 
{ 

    public SyncPipe(InputStream istrm, OutputStream ostrm) { 
     istrm_ = istrm; 
     ostrm_ = ostrm; 

    } 

    public void run() { 

     try 
     { 
      int length; 
      byte[] buffer = new byte[1024]; 

      for (length = 0; (length = istrm_.read(buffer)) != -1;){ 

       ostrm_.write(buffer, 0, length); 
      } 

     } 
     catch (Exception e) 
     { 
      e.printStackTrace(); 
     } 


    } 


    private final OutputStream ostrm_; 
    private final InputStream istrm_; 
}

GDB從外部程序輸出：

GNU gdb (Ubuntu/Linaro 7.3-0ubuntu2) 7.3-2011.08 
Copyright (C) 2011 Free Software Foundation, Inc. 
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> 
This is free software: you are free to change and redistribute it. 
There is NO WARRANTY, to the extent permitted by law. Type "show copying" 
and "show warranty" for details. 
This GDB was configured as "i686-linux-gnu". 
For bug reporting instructions, please see: 
<http://bugs.launchpad.net/gdb-linaro/>... 
Reading symbols from /home/charmae/workspace/AVT/a.out...done. 
(gdb) Breakpoint 1 at 0x804843d: file file4.c, line 7. 
(gdb) Starting program: /home/charmae/workspace/AVT/a.out 

Breakpoint 1, main() at file4.c:7 
7  printf("input of x: "); 
(gdb) 8  scanf("%d",&x); 
(gdb) Undefined command: "45". Try "help". 
(gdb)

來源

2011-11-29 Chinwei

你可以在shell重定向輸入就像

(gdb) run < input.txt

或者，您可以在另一個終端上運行的程序，並通過PID連接到它：

gdb --pid $(pgrep myprogram.name)

最後，您可以用直接調用dup2/dup3類似黑客做（但我不認爲你需要做的的是，它不會是用戶友好的）

來源

2011-11-29 08:20:23 sehe

喲，你可以更多地討論如何使用此方法： GDB --pid $（p纖ep myprogram.name）也使用文件描述符的重複？ –

我怎麼可能使用dup2/dup3？ –

在dup2上看到[這裏]（http://stackoverflow.com/a/249932/85371）的一般想法;在'gdb --pid'參見[here]（http://linux.die.net/man/1/gdb） – sehe

使用外部程序發送輸入到GDB scanf

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