lib/sendfile.c

ソースコードを見る。

関数
ssize_t	sys_sendfile (int tofd, int fromfd, const DATA_BLOB *header, SMB_OFF_T offset, size_t count)
int32	sendfile (int out_fd, int in_fd, int32 *offset, uint32 count)

---

関数

ssize_t sys_sendfile	(	int	tofd,
		int	fromfd,
		const DATA_BLOB *	header,
		SMB_OFF_T	offset,
		size_t	count
	)

sendfile.c の 37 行で定義されています。

参照先 data_blob_::data・errno・data_blob_::length・sendfile()・sys_send()・total.

参照元 vfswrap_sendfile().

{
        size_t total=0;
        ssize_t ret;
        size_t hdr_len = 0;

        /*
         * Send the header first.
         * Use MSG_MORE to cork the TCP output until sendfile is called.
         */

        if (header) {
                hdr_len = header->length;
                while (total < hdr_len) {
                        ret = sys_send(tofd, header->data + total,hdr_len - total, MSG_MORE);
                        if (ret == -1)
                                return -1;
                        total += ret;
                }
        }

        total = count;
        while (total) {
                ssize_t nwritten;
                do {
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_SENDFILE64)
                        nwritten = sendfile64(tofd, fromfd, &offset, total);
#else
                        nwritten = sendfile(tofd, fromfd, &offset, total);
#endif
                } while (nwritten == -1 && errno == EINTR);
                if (nwritten == -1) {
                        if (errno == ENOSYS) {
                                /* Ok - we're in a world of pain here. We just sent
                                 * the header, but the sendfile failed. We have to
                                 * emulate the sendfile at an upper layer before we
                                 * disable it's use. So we do something really ugly.
                                 * We set the errno to a strange value so we can detect
                                 * this at the upper level and take care of it without
                                 * layer violation. JRA.
                                 */
                                errno = EINTR; /* Normally we can never return this. */
                        }
                        return -1;
                }
                if (nwritten == 0)
                        return -1; /* I think we're at EOF here... */
                total -= nwritten;
        }
        return count + hdr_len;
}

int32 sendfile	(	int	out_fd,
		int	in_fd,
		int32 *	offset,
		uint32	count
	)

参照元 sys_sendfile().

---