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man send.
RETURN VALUE
On success, these calls return the number of characters sent. On error, -1 is
returned, and errno is set appropriately.
成功代表内容被成功地传输到网络了,不代表到达远方目的地。
还有看以下如此多的错误返回,也可以知道send绝对不是将内容放到本地buffer就返回(只要buffer有空间就成功返回)那样简单。
ERRORS
These are some standard errors generated by the socket layer. Additional errors
may be generated and returned from the underlying protocol modules; see their
respective manual pages.
EACCES (For Unix domain sockets, which are identified by pathname) Write permisâ |
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