为什么valgrind说fclose()
来电时我的内存泄漏?
#include <stdio.h>
class Stream
{
public:
Stream();
~Stream();
private:
char* pszOutput;
size_t size;
FILE* file;
};
Stream::Stream()
{
file = open_memstream(&pszOutput, &size);
}
Stream::~Stream()
{
fclose(file);
}
int main()
{
Stream s;
return 0;
}
Valgrind报告:
==52387== 1 bytes in 1 blocks are definitely lost in loss record 1 of 1
==52387== at 0x4C28CCE: realloc (vg_replace_malloc.c:632)
==52387== by 0x5639CA3: _IO_mem_finish (memstream.c:132)
==52387== by 0x5635956: fclose@@GLIBC_2.2.5 (iofclose.c:66)
初始化pszOutput
或size
是否重要?或者我可能需要添加别的东西?
答案 0 :(得分:3)
来自:http://linux.die.net/man/3/open_memstream
open_memstream()函数打开一个用于写入缓冲区的流。缓冲区是动态分配的(与malloc(3)一样),并根据需要自动增长。关闭流后,调用者应释放(3)此缓冲区。
因此,根据这一点,您需要在文件描述符关闭后 free(pszOutput)。