Question

我只是想开始学习C http://fromlearncodethehardway.com。但是，在尝试编写其中一个示例时，我遇到了分段错误。 Here's我的源代码链接。我尝试使用valgrind进一步帮助调试，但我似乎无法弄清楚问题。这是来自valgrind的堆栈跟踪。

   ~/Chardway$ valgrind ./ex17 db.dat g
   ==4423== Memcheck, a memory error detector                                                                                 == 4423== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
 ==4423== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for copyright info
 ==4423== Command: ./ex17 db.dat g
 ==4423== 
 ==4423== Invalid read of size 1
 ==4423==    at 0x4EA4F1D: _IO_file_fopen@@GLIBC_2.2.5 (fileops.c:271)
 ==4423==    by 0x4E99DB5: __fopen_internal (iofopen.c:93)
 ==4423==    by 0x400A76: Database_open (ex17.c:65)
 ==4423==    by 0x400F7C: main (ex17.c:151)
 ==4423==  Address 0x722b is not stack'd, malloc'd or (recently) free'd
 ==4423== 
 ==4423== 
 ==4423== Process terminating with default action of signal 11 (SIGSEGV)
 ==4423==  Access not within mapped region at address 0x722B
 ==4423==    at 0x4EA4F1D: _IO_file_fopen@@GLIBC_2.2.5 (fileops.c:271)
 ==4423==    by 0x4E99DB5: __fopen_internal (iofopen.c:93)
 ==4423==    by 0x400A76: Database_open (ex17.c:65)
  ==4423==    by 0x400F7C: main (ex17.c:151)
.....

  ==4423== For counts of detected and suppressed errors, rerun with: -v
  ==4423== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 4 from 4)
 Segmentation fault

任何有关调试的帮助都会很棒。谢谢！

Answer 1

在您的代码中，您有fopen次来电fopen(filename,'w');＆amp; fopen(filename,'r+');。那些应该是fopen(filename,"w");＆amp; fopen(filename,"r+");。 fopen的第二个参数应为const char *
希望这有帮助！

Answer 2

顺便说一下，我认为你的意思是http://c.learncodethehardway.org/ 您提供的地址无法解决。

分段故障打开文件

2 个答案: