在源码中tcp_write函数的注释：
/** * Write data for sending (but does not send it immediately). * * It waits in the expectation of more data being sent soon (as * it can send them more efficiently by combining them together). * To prompt the system to send data now, call tcp_output() after * calling tcp_write(). * * @param pcb Protocol control block for the TCP connection to enqueue data for. * @param arg Pointer to the data to be enqueued for sending. * @param len Data length in bytes * @param apiflags combination of following flags : * - TCP_WRITE_FLAG_COPY (0x01) data will be copied into memory belonging to the stack * - TCP_WRITE_FLAG_MORE (0x02) for TCP connection, PSH flag will be set on last segment sent, * @return ERR_OK if enqueued, another err_t on error */ err_t tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t apiflags) { struct pbuf *concat_p = NULL; struct tcp_seg *last_unsent = NULL, *seg = NULL, *prev_seg = NULL, *queue = NULL; u16_t pos = 0; /* position in 'arg' data */
在注释中
tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t apiflags)
最后一个参数
* - TCP_WRITE_FLAG_COPY (0x01) data will be copied into memory belonging to the stack
* - TCP_WRITE_FLAG_MORE (0x02) for TCP connection, PSH flag will be set on last segment sent,
想请问，当apiflags分别为0x00,0x01,0x02 时有什么不同，分别适用于哪种情况？？？
