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The C and C++ Include Header Files

/usr/include/linux/iio/buffer.h


$ cat -n /usr/include/linux/iio/buffer.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/* industrial I/O buffer definitions needed both in and out of kernel
     3	 */
     4	
     5	#ifndef _IIO_BUFFER_H_
     6	#define _IIO_BUFFER_H_
     7	
     8	#define IIO_BUFFER_GET_FD_IOCTL			_IOWR('i', 0x91, int)
     9	
    10	#endif /* _IIO_BUFFER_H_ */