/usr/include/proc/wchan.h is in libproc-dev 1:3.2.8-11ubuntu6.
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 13 14 15 16 | #ifndef PROCPS_PROC_WCHAN_H
#define PROCPS_PROC_WCHAN_H
#include "procps.h"
EXTERN_C_BEGIN
typedef void (*message_fn)(const char *restrict, ...) __attribute__((format(printf,1,2)));
extern const char * lookup_wchan(unsigned KLONG address, unsigned pid);
extern int open_psdb(const char *restrict override);
extern int open_psdb_message(const char *restrict override, message_fn message);
EXTERN_C_END
#endif
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