glibc/include/pwd.h

#ifndef _PWD_H
#include <pwd/pwd.h>

/* Now define the internal interfaces.  */
extern int __getpwent_r (struct passwd *__resultbuf, char *__buffer,
			 size_t __buflen, struct passwd **__result);
extern int __getpwuid_r (__uid_t __uid, struct passwd *__resultbuf,
			 char *__buffer, size_t __buflen,
			 struct passwd **__result);
extern int __getpwnam_r (__const char *__name, struct passwd *__resultbuf,
			 char *__buffer, size_t __buflen,
			 struct passwd **__result);
extern int __fgetpwent_r (FILE * __stream, struct passwd *__resultbuf,
			  char *__buffer, size_t __buflen,
			  struct passwd **__result);
#endif