/usr/include/proc/wchan.h is in libprocps-dev 2:3.3.12-3+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #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
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