/usr/include/lirc/irpipe.h is in liblirc-dev 0.10.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | /** Unique ioctl commands supported by irpipe. */
#define LIRC_SET_FEATURES _IOW('i', 0x00000040, __u32)
#define LIRC_SET_LENGTH _IOW('i', 0x00000041, __u32)
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