This file is indexed.

/usr/include/proc/wchan.h is in libprocps-dev 2:3.3.12-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#ifndef PROCPS_PROC_WCHAN_H
#define PROCPS_PROC_WCHAN_H

#include "procps.h"

EXTERN_C_BEGIN

extern const char * lookup_wchan (int pid);

EXTERN_C_END

#endif