可能没有足够的磁盘空间来完成该文件的写操作，或者由于没有足够的内存可用，分配缓冲区可能失败。
There might not be enough disk space to complete the file write operation, or allocating the buffer could fail if not enough memory is available.
该函数将错误代码和一个预分配的缓冲区作为参数。
It takes the error code and a pre-allocated buffer as its parameters.
操作系统会为网络资源分配各种缓冲区。
Your operating system allocates various buffers for network resources.
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