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ssize_t sendfile(int out_fd, int in_fd, off_t *offset, size_t count);
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sys_sendfile
=> Èë¿Ú
do_sendfile
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generic_splice_sendpage
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struct socket *sock;
int flags;
sock = file->private_data;
flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
if (more)
   
flags |= MSG_MORE;
return sock->ops->sendpage(sock, page, offset, size, flags);
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