This file is indexed.

/usr/include/proc/pwcache.h is in libprocps4-dev 2:3.3.10-4ubuntu2.

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_PWCACHE_H
#define PROCPS_PROC_PWCACHE_H

#include <sys/types.h>
#include "procps.h"

EXTERN_C_BEGIN

// used in pwcache and in readproc to set size of username or groupname
#define P_G_SZ 33

extern char *user_from_uid(uid_t uid);
extern char *group_from_gid(gid_t gid);

EXTERN_C_END

#endif