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About splice systemcall problem

while i was using splice system call for copy one file to another,
I got the error is given below:

splice() (from) failed: Invalid argument

In file:
int relay_fd,log_fd;
int pipe_fd[2];
int retval;
After open the files,

retval = splice(relay_fd, NULL, pipe_fd[1], NULL, 128, SPLICE_F_MOVE);

If you have any idea, please help me.

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