首先,我知道similar已提出问题。但是,我想问一个关于真正原始 C 数据类型的更一般的简单问题。所以就是这样。
In main.c
我调用一个函数来填充这些字符串:
int
main (int argc, char *argv[]){
char *host = NULL ;
char *database ;
char *collection_name;
char *filename = "";
char *fields = NULL;
char *query = NULL;
...
get_options(argc, argv, &host, &database, &collection_name, &filename,
&fields, &query, &aggregation);
Inside get_options
:
if (*filename == NULL ) {
*filename = (char*)realloc(*filename, strlen(*collection_name)*sizeof(char)+4);
strcpy(*filename, *collection_name);
strcat(*filename, ".tde"); # line 69
}
我的程序运行良好,但是 Valgrind 告诉我我做错了:
==8608== Memcheck, a memory error detector
==8608== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==8608== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==8608== Command: ./coll2tde -h localhost -d test -c test
==8608==
==8608== Invalid write of size 1
==8608== at 0x403BE2: get_options (coll2tde.c:69)
==8608== by 0x402213: main (coll2tde.c:92)
==8608== Address 0xa2edd18 is 0 bytes after a block of size 8 alloc'd
==8608== at 0x4C28BED: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==8608== by 0x4C28D6F: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==8608== by 0x403BBC: get_options (coll2tde.c:67)
==8608== by 0x402213: main (coll2tde.c:92)
你能解释一下这个错误吗Address 0xa2edd18 is 0 bytes after a block of size 8 alloc'd
?
我该如何解决这个问题?