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原帖由 langue 于 2007-3-3 00:53 发表于 3楼
sendfile() 如何？还有 sendfile64()，好用不？
>>
>>
>>应该可以使用，但是就怕不方便进行编码转换，例如asicc-->binary
>>我记得linux上常见的ftp程序是使用read、send类似的函数进行数据
>>发送，为的是方便进行编码转化
>>
>>
int
sendfile(int fd, int s, off_t offset, size_t nbytes,
struct sf_hdtr *hdtr, off_t *sbytes, int flags);
DESCRIPTION
Sendfile() sends a regular file specified by descriptor fd out a stream
socket specified by descriptor s.
The offset argument specifies where to begin in the file. The nbytes
argument specifies how many bytes of the file should be sent, with 0 hav-
ing the special meaning of send until the end of file has been reached.
An optional header and/or trailer can be sent before and after the file
data by specifying a pointer to a struct sf_hdtr, which has the following
structure:
struct sf_hdtr {
struct iovec *headers; /* pointer to header iovecs */
int hdr_cnt; /* number of header iovecs */
struct iovec *trailers; /* pointer to trailer iovecs */
int trl_cnt; /* number of trailer iovecs */
};
The headers and trailers pointers, if non-NULL, point to arrays of struct
iovec structures. See the writev() system call for information on the
iovec structure. The number of iovecs in these arrays is specified by
hdr_cnt and trl_cnt.
If non-NULL, the system will write the total number of bytes sent on the
socket to the variable pointed to by sbytes.
The flags argument is currently undefined and should be specified as 0.
When using a socket marked for non-blocking I/O, sendfile() may send
fewer bytes than requested. In this case, the number of bytes success-
fully written is returned in *sbytes (if specified), and the error EAGAIN
is returned. |
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发表于 2007-03-02 16:48
发表于 2007-03-03 00:53
