asmlinkage long sys_splice(int fd_in, loff_t __user *off_in,
int fd_out, loff_t __user *off_out,
size_t len, unsigned int flags)
{
long error;
struct file *in, *out;
int fput_in, fput_out;
if (unlikely(!len))
return 0;
error = -EBADF;
in = fget_light(fd_in, &fput_in);
if (in) {
if (in->f_mode & FMODE_READ) {
out = fget_light(fd_out, &fput_out);
if (out) {
if (out->f_mode & FMODE_WRITE)
error = do_splice(in, off_in,
out, off_out,
len, flags);
fput_light(out, fput_out);
}
}
fput_light(in, fput_in);
}
return error;
}
int main(int argc, char *argv[])
{
int fd, index;
if (argc < 2)
return usage(argv[0]);
if (check_input_pipe())
return usage(argv[0]);
index = parse_options(argc, argv);
if (index == -1 || index + 1 > argc)
return usage(argv[0]);
fd = open(argv[index], O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd < 0)
return error("open output");
do {
int tee_len = stee(STDIN_FILENO, STDOUT_FILENO, INT_MAX, 0);
if (tee_len < 0) {
if (errno == EAGAIN) {
usleep(1000);
continue;
}
return error("tee");
} else if (!tee_len)
break;
/*
* Send output to file, also consumes input pipe.
*/
if (do_splice(STDIN_FILENO, fd, tee_len, "splice-file"))
break;
} while (1);
return 0;
}
