使用READN后出现的错误

用了ReadN函数后，先是出现
2010-06-19 22:05:47 [ThreadID:2105]->TSocket::ReadN [248] : 2:无此文件或目录
2010-06-19 22:07:47 [ThreadID:2108]->TSocket::ReadN [248] : 2:无此文件或目录
2010-06-19 22:12:48 [ThreadID:2111]->TSocket::ReadN [249] : 2:无此文件或目录
2010-06-19 22:14:48 [ThreadID:2114]->TSocket::ReadN [249] : 2:无此文件或目录
2010-06-19 22:23:48 [ThreadID:2117]->TSocket::ReadN [250] : 2:无此文件或目录
2010-06-19 22:25:48 [ThreadID:2120]->TSocket::ReadN [250] : 2:无此文件或目录
2010-06-19 22:32:48 [ThreadID:2123]->TSocket::ReadN [251] : 2:无此文件或目录
2010-06-19 22:34:48 [ThreadID:2126]->TSocket::ReadN [251] : 2:无此文件或目录
2010-06-19 22:40:48 [ThreadID:2129]->TSocket::ReadN [252] : 2:无此文件或目录
2010-06-19 22:48:48 [ThreadID:2133]->TSocket::ReadN [253] : 5:I/O错误
2010-06-19 22:50:48 [ThreadID:2136]->TSocket::ReadN [253] : 5:I/O错误
2010-06-19 22:55:48 [ThreadID:2139]->TSocket::ReadN [253] : 5:I/O错误
2010-06-19 22:57:48 [ThreadID:2142]->TSocket::ReadN [253] : 5:I/O错误
出现无此文件或目录，后又出现I/O错误，最后导致进程吊死，这是怎么原因啊？
int TSocket::ReadN(int iSockFD, char* sMsgBuf, int iToRead)
{
        int  nleft;
        int  nread;
        char *ptr;
       
        ptr = sMsgBuf;
        nleft = iToRead;
        while (nleft > 0)
        {
                if ( (nread = read(iSockFD, ptr, nleft)) < 0)
                {
                        if (errno == EINTR || errno==EAGAIN)
                        {
                                nread = 0;      // and call read() again
                        }
                        else
                        {
                                return (-1);
                        }
                }
                else if (nread == 0)
                {
                        log.write((char *)"ERROR", LOG_DEV|TRIVAL|LOG_TIME_TID, "TSocket::ReadN [%d] : %d:%s\n",
                                                                iSockFD, errno, strerror(errno));
                        break;             // EOF
                }
       
                nleft -= nread;
                ptr += nread;
        }

        return (iToRead - nleft);        //return >= 0
}

RETURN VALUE
       On  success,  the  number of bytes read is returned (zero indicates end of file), and the file
       position is advanced by this number.  It is not an error if this number is  smaller  than  the
       number of bytes requested; this may happen for example because fewer bytes are actually avail-
       able right now (maybe because we were close to end-of-file, or because we are reading  from  a
       pipe,  or  from  a  terminal), or because read() was interrupted by a signal.  On error, -1 is
       returned, and errno is set appropriately. In this case it is left unspecified whether the file
       position (if any) changes.

莫非这个不是错误吗？

返回值为0表示你已经读到文件末尾了，读完了，不是错误，返回-1是错误。。。

那不是错误，怎么进程就会吊死啊
跑到后面线程有些日志是需要记录的，但是到后面却不记录了，突然就迸出一个线程ID出来。