Exception during opening file

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C

Dear all,

What does the function (_mlock) do? I don't call the function manually. I found that many functions (new, _mbschr,_mbscmp,etc) will use it. I don't know why my program gives the error (runn time error).

I'm going to create an FTP where a client will open a file and read a date and send data toward to the server. The server opens a file and writes that data to the file but when the server goes to open the file it will get a run time error.

void reciveMsg(unsigned int av_sock);
void reciveFile(unsigned int av_sock);
void reciveMsg(unsigned int av_sock)
{
	int lv_ret;
	char			*lp_buff		= NULL;
		
	while(1)
	{
		lp_buff = (char *)malloc(sizeof(513));
		memset(lp_buff,0,512);
		lv_ret = recv(av_sock,lp_buff,512,0);
		printf("\n%s",lp_buff);
		delete(lp_buff);
		if(lv_ret == -1)
		{
			closesocket(av_sock);
			FD_CLR(av_sock, &master);
			printf("\nSocket closed");
			return;
		}
	}
}
void reciveFile(unsigned int av_sock)
{
	FILE		*fp		= NULL;
	int		lv_ret;
	char		*lp_buff	= NULL;
	char		lv_bufer[512]	= {""}; "//added for color correction
	int		lv_handle	= -1;
	
	
	lv_handle = _open("D:\\xyz\\test.txt", _O_RDWR);
	
	 if(lv_handle == -1)
	 {
		printf("\nError In Opening File");
		return;
	 }
	while(1)
	{
		lp_buff = (char *)malloc(sizeof(1025));
		memset(lp_buff,0,1024);
		lv_ret = recv(av_sock,lp_buff,1024,0);
		lv_ret = _write(lv_handle,lp_buff,sizeof(lp_buff));
		if(lv_ret != sizeof(lp_buff))
		{
			printf("\nTotal Bytes Write [%ld] ",lv_ret);
			return;
		}
		printf("\nWriting In File Please Wait");
	}
	_close(lv_handle); 

}

[Added a double-quote to color-correct the code]