Invalid argument in sendfile() with two regular files
- by Daniel Hershcovich
I'm trying to test the sendfile() system call under Linux 2.6.32 to zero-copy data between two regular files.
As far as I understand, it should work: ever since 2.6.22, sendfile() has been implemented using splice(), and both the input file and the output file can be either regular files or sockets.
The following is the content of sendfile_test.c:
#include <sys/sendfile.h>
#include <fcntl.h>
#include <stdio.h>
int main(int argc, char **argv) {
int result;
int in_file;
int out_file;
in_file = open(argv[1], O_RDONLY);
out_file = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644);
result = sendfile(out_file, in_file, NULL, 1);
if (result == -1)
perror("sendfile");
close(in_file);
close(out_file);
return 0;
}
And when I'm running the following commands:
$ gcc sendfile_test.c
$ ./a.out infile
The output is
sendfile: Bad file descriptor
Which means that the system call resulted in errno = -EINVAL, I think.
What am I doing wrong?
