"realloc()"を使用するとValgrindが "無効な空きまたは削除"を生成するのはなぜですか?
valgrind --tool=memcheck --leak-check=yes --show-reachable=yes a.out
に従い、valgrindのによって生成されたエラー情報が
==6402== Memcheck, a memory error detector.
==6402== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.
==6402== Using LibVEX rev 1575, a library for dynamic binary translation.
==6402== Copyright (C) 2004-2005, and GNU GPL'd, by OpenWorks LLP.
==6402== Using valgrind-3.1.1, a dynamic binary instrumentation framework.
==6402== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al.
==6402== For more details, rerun with: -v
==6402==
dinesh
vignesh
==6402== Invalid free()/delete/delete[]
==6402== at 0x4905E12: realloc (vg_replace_malloc.c:306)
==6402== by 0x400539: main (in /user/gur29597/mysourcecode/VMake/a.out)
==6402== Address 0x7FF000830 is on thread 1's stack
vishwa
==6402==
==6402== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 4 from 1)
==6402== malloc/free: in use at exit: 0 bytes in 0 blocks.
==6402== malloc/free: 1 allocs, 1 frees, 3 bytes allocated.
==6402== For counts of detected errors, rerun with: -v
==6402== All heap blocks were freed -- no leaks are possible.
次のように私のコードは、
#include<stdio.h>
int main()
{
char *name[2];
name[0]="dinesh";
name[1]="vignesh";
printf("%s\n%s\n",name[0],name[1]);
realloc(name,3);
name[2]="vishwa";
printf("%s\n",name[2]);
return 0;
}
以下の正解に加えて、 'realloc()'にサイズをバイト単位で渡すように注意する必要があります。 'name 'が' malloc() 'で割り当てられたブロックを正しく指していても、' realloc(name、3); 'はあなたが望むことをしません。 –