glibc/grp/grp.h

/* Copyright (C) 1991, 1992, 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/*
 *	POSIX Standard: 9.2.1 Group Database Access	<grp.h>
 */

#ifndef	_GRP_H

#define	_GRP_H	1
#include <features.h>

__BEGIN_DECLS

#include <gnu/types.h>


/* The group structure.	 */
struct group
  {
    char *gr_name;		/* Group name.	*/
    char *gr_passwd;		/* Password.	*/
    __gid_t gr_gid;		/* Group ID.	*/
    char **gr_mem;		/* Member list.	*/
  };


#if defined(__USE_SVID) || defined(__USE_GNU)
#define	__need_FILE
#include <stdio.h>
#endif

#ifdef	__USE_GNU
/* Return a new stream open on the group file.  */
extern FILE *__grpopen __P ((void));

/* Read a group entry from STREAM, filling in G.
   Return the `struct group' of G if successful, NULL on failure.  */
extern struct group *__grpread __P ((FILE * __stream, __ptr_t __g));

/* Return a chunk of memory containing pre-initialized data for __grpread.  */
extern __ptr_t __grpalloc __P ((void));

/* Scan the group file, filling in G, until SELECTOR returns nonzero for an
   entry.  Return the `struct group' of G if successful, NULL on failure.  */
extern struct group *__grpscan __P ((__ptr_t *__p,
				     int (*__selector) (struct group *)));
#endif


#if defined(__USE_SVID) || defined(__USE_MISC) || defined (__USE_BSD)
/* Rewind the group-file stream.  */
extern void setgrent __P ((void));

/* Close the group-file stream.  */
extern void endgrent __P ((void));

/* Read an entry from the group-file stream, opening it if necessary.  */
extern struct group *getgrent __P ((void));
#endif

#ifdef	__USE_SVID
/* Read a group entry from STREAM.  */
extern struct group *fgetgrent __P ((FILE * __stream));
#endif

/* Search for an entry with a matching group ID.  */
extern struct group *getgrgid __P ((__gid_t __gid));

/* Search for an entry with a matching group name.  */
extern struct group *getgrnam __P ((__const char *__name));

#ifdef	__USE_REENTRANT
/* Reasonable value for the buffer sized used in the reentrant
   functions below.  But better use `sysconf'.  */
#define	NSS_BUFLEN_GROUP	1024

/* Reentrant versions of some of the functions above.

   PLEASE NOTE: these functions are not yet standardized.  The interface
   may change in later versions of this library.  */

#if defined(__USE_SVID) || defined(__USE_MISC) || defined (__USE_BSD)
extern struct group *getgrent_r __P ((struct group *__resultbuf,
				      char *buffer, int __buflen));
#endif

/* Search for an entry with a matching group ID.  */
extern struct group *getgrgid_r __P ((__gid_t __gid,
				      struct group *__resultbuf,
				      char *buffer, int __buflen));

/* Search for an entry with a matching group name.  */
extern struct group *getgrnam_r __P ((__const char *__name,
				      struct group *__resultbuf,
				      char *buffer, int __buflen));

#ifdef	__USE_SVID
/* Read a group entry from STREAM.  */
extern struct group *__fgetgrent_r __P ((FILE * __stream,
					 struct group *__resultbuf,
					 char *buffer, int __buflen));
extern struct group *fgetgrent_r __P ((FILE * __stream,
				       struct group *__resultbuf,
				       char *buffer, int __buflen));
#endif

#endif	/* reentrant */


#ifdef	__USE_BSD

#define	__need_size_t
#include <stddef.h>

/* Set the group set for the current user to GROUPS (N of them).  */
extern int setgroups __P ((size_t __n, __const __gid_t * groups));

/* Initialize the group set for the current user
   by reading the group database and using all groups
   of which USER is a member.  Also include GROUP.  */
extern int initgroups __P ((__const char *user, __gid_t group));

#endif /* Use BSD.  */

__END_DECLS

#endif /* grp.h  */