问题描述
限时送ChatGPT账号..正如标题所说,在面向连接的套接字上一次写入的字节数是否有限制?
As the title says, is there a limit to the number of bytes that can be written at once on a connection-oriented socket?
如果我想发送一个缓冲区,例如 1024 字节,我可以使用一个
If I want to send a buffer of, for example, 1024 bytes, can I use a
write(tcp_socket, buffer, 1024);
或者我应该使用多个 write()
调用,每个调用的字节数较少?
or should I use multiple write()
calls with a lower amount of bytes for each one?
推荐答案
write()
不保证所有字节都会被写入,所以多次调用 write()
是必要的.来自 man write:
write()
does not guarantee that all bytes will be written so multiple calls to write()
are required. From man write:
写入的字节数可能小于 count,例如,如果底层物理介质空间不足,或者遇到 RLIMIT_FSIZE 资源限制(请参阅 setrlimit(2)),或者在写入少于 count 个字节后调用被信号处理程序中断.(另见管道(7).)
The number of bytes written may be less than count if, for example, there is insufficient space on the underlying physical medium, or the RLIMIT_FSIZE resource limit is encountered (see setrlimit(2)), or the call was interrupted by a signal handler after having written less than count bytes. (See also pipe(7).)
write()
返回写入的字节数,因此必须维护写入的字节总数,并将其用作 buffer
的索引并计算要写入的剩余字节:
write()
returns the number of bytes written so a running total of the bytes written must be maintained and used as an index into buffer
and to calculate the number of remaining bytes to be written:
ssize_t total_bytes_written = 0;
while (total_bytes_written != 1024)
{
assert(total_bytes_written < 1024);
ssize_t bytes_written = write(tcp_socket,
&buffer[total_bytes_written],
1024 - total_bytes_written);
if (bytes_written == -1)
{
/* Report failure and exit. */
break;
}
total_bytes_written += bytes_written;
}
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