/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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/*

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

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*/

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#ifndef _GRP_H

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#define _GRP_H 1

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#include <features.h>

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__BEGIN_DECLS

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#include <bits/types.h>

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#define __need_size_t

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#include <stddef.h>

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/* For the Single Unix specification we must define this type here. */

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#if (defined __USE_XOPEN || defined __USE_XOPEN2K) && !defined __gid_t_defined

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typedef __gid_t gid_t;

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# define __gid_t_defined

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#endif

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/* The group structure. */

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struct group

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{

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char *gr_name; /* Group name. */

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char *gr_passwd; /* Password. */

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__gid_t gr_gid; /* Group ID. */

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char **gr_mem; /* Member list. */

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};

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#ifdef __USE_MISC

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# include <bits/types/FILE.h>

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#endif

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#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED

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/* Rewind the group-file stream.

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This function is a possible cancellation point and therefore not

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marked with __THROW. */

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extern void setgrent (void);

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/* Close the group-file stream.

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This function is a possible cancellation point and therefore not

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marked with __THROW. */

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extern void endgrent (void);

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/* Read an entry from the group-file stream, opening it if necessary.

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This function is a possible cancellation point and therefore not

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marked with __THROW. */

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extern struct group *getgrent (void);

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#endif

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#ifdef __USE_MISC

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/* Read a group entry from STREAM.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern struct group *fgetgrent (FILE *__stream);

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#endif

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#ifdef __USE_GNU

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/* Write the given entry onto the given stream.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern int putgrent (const struct group *__restrict __p,

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FILE *__restrict __f);

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#endif

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/* Search for an entry with a matching group ID.

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This function is a possible cancellation point and therefore not

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marked with __THROW. */

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extern struct group *getgrgid (__gid_t __gid);

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/* Search for an entry with a matching group name.

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This function is a possible cancellation point and therefore not

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marked with __THROW. */

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extern struct group *getgrnam (const char *__name);

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#ifdef __USE_POSIX

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# ifdef __USE_MISC

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/* Reasonable value for the buffer sized used in the reentrant

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functions below. But better use `sysconf'. */

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# define NSS_BUFLEN_GROUP 1024

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# endif

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/* Reentrant versions of some of the functions above.

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PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.

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The interface may change in later versions of this library. But

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the interface is designed following the principals used for the

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other reentrant functions so the chances are good this is what the

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POSIX people would choose.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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# ifdef __USE_GNU

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extern int getgrent_r (struct group *__restrict __resultbuf,

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char *__restrict __buffer, size_t __buflen,

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struct group **__restrict __result);

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# endif

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/* Search for an entry with a matching group ID.

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This function is a possible cancellation point and therefore not

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marked with __THROW. */

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extern int getgrgid_r (__gid_t __gid, struct group *__restrict __resultbuf,

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char *__restrict __buffer, size_t __buflen,

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struct group **__restrict __result);

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/* Search for an entry with a matching group name.

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This function is a possible cancellation point and therefore not

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marked with __THROW. */

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extern int getgrnam_r (const char *__restrict __name,

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struct group *__restrict __resultbuf,

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char *__restrict __buffer, size_t __buflen,

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struct group **__restrict __result);

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# ifdef __USE_MISC

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/* Read a group entry from STREAM. This function is not standardized

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an probably never will.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern int fgetgrent_r (FILE *__restrict __stream,

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struct group *__restrict __resultbuf,

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char *__restrict __buffer, size_t __buflen,

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struct group **__restrict __result);

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# endif

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#endif /* POSIX or reentrant */

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#ifdef __USE_MISC

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# define __need_size_t

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# include <stddef.h>

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/* Set the group set for the current user to GROUPS (N of them). */

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extern int setgroups (size_t __n, const __gid_t *__groups) __THROW;

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/* Store at most *NGROUPS members of the group set for USER into

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*GROUPS. Also include GROUP. The actual number of groups found is

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returned in *NGROUPS. Return -1 if the if *NGROUPS is too small.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern int getgrouplist (const char *__user, __gid_t __group,

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__gid_t *__groups, int *__ngroups);

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/* Initialize the group set for the current user

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by reading the group database and using all groups

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of which USER is a member. Also include GROUP.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern int initgroups (const char *__user, __gid_t __group);

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#endif /* Use misc. */

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__END_DECLS

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#endif /* grp.h */

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