/usr/include/proc/pwcache.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 17 | #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 20
extern char *user_from_uid(uid_t uid);
extern char *group_from_gid(gid_t gid);
EXTERN_C_END
#endif
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