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208 lines
6.7 KiB
C
208 lines
6.7 KiB
C
/* Copyright (C) 1991-2025 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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<https://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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__attr_access ((__write_only__, 2, 3));
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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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__attr_access ((__write_only__, 3, 4));
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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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__attr_access ((__write_only__, 3, 4));
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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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__attr_access ((__write_only__, 3, 4));
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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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