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[lwip-devel] [bug #59632] Calling tcp_write() without TCP_WRITE_FLAG_COP
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From: |
Oleg Kobrin |
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Subject: |
[lwip-devel] [bug #59632] Calling tcp_write() without TCP_WRITE_FLAG_COPY does in fact copy data |
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Date: |
Tue, 8 Dec 2020 05:15:37 -0500 (EST) |
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User-agent: |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36 |
Follow-up Comment #3, bug #59632 (project lwip):
In my case: I checked again, writing a packet of 12 bytes without
TCP_WRITE_FLAG_COPY set decreases pcb->snd_buf by 12.
Another try:
calling err_t Err = tcp_write(Connects[Sock].pcb, Data, Len, 0);
Len = 2404, pcb->snd_buf = 23722.
After call:
pcb->snd_buf = 21318.
23722 - 21318 = 2404.
Looks like this is due to TCP_OVERSIZE is defined default to TCP_MSS.
Data is copied to oversize buf.
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