--- /dev/null
+/* Copyright (C) 1991-2018 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/*
+ * POSIX Standard: 9.2.1 Group Database Access <grp.h>
+ */
+
+#ifndef _GRP_H
+#define _GRP_H 1
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+#include <bits/types.h>
+
+#define __need_size_t
+#include <stddef.h>
+
+
+/* For the Single Unix specification we must define this type here. */
+#if (defined __USE_XOPEN || defined __USE_XOPEN2K) && !defined __gid_t_defined
+typedef __gid_t gid_t;
+# define __gid_t_defined
+#endif
+
+/* 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. */
+ };
+
+
+#ifdef __USE_MISC
+# include <bits/types/FILE.h>
+#endif
+
+
+#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
+/* Rewind the group-file stream.
+
+ This function is a possible cancellation point and therefore not
+ marked with __THROW. */
+extern void setgrent (void);
+
+/* Close the group-file stream.
+
+ This function is a possible cancellation point and therefore not
+ marked with __THROW. */
+extern void endgrent (void);
+
+/* Read an entry from the group-file stream, opening it if necessary.
+
+ This function is a possible cancellation point and therefore not
+ marked with __THROW. */
+extern struct group *getgrent (void);
+#endif
+
+#ifdef __USE_MISC
+/* Read a group entry from STREAM.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern struct group *fgetgrent (FILE *__stream);
+#endif
+
+#ifdef __USE_GNU
+/* Write the given entry onto the given stream.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern int putgrent (const struct group *__restrict __p,
+ FILE *__restrict __f);
+#endif
+
+/* Search for an entry with a matching group ID.
+
+ This function is a possible cancellation point and therefore not
+ marked with __THROW. */
+extern struct group *getgrgid (__gid_t __gid);
+
+/* Search for an entry with a matching group name.
+
+ This function is a possible cancellation point and therefore not
+ marked with __THROW. */
+extern struct group *getgrnam (const char *__name);
+
+#ifdef __USE_POSIX
+
+# ifdef __USE_MISC
+/* Reasonable value for the buffer sized used in the reentrant
+ functions below. But better use `sysconf'. */
+# define NSS_BUFLEN_GROUP 1024
+# endif
+
+/* Reentrant versions of some of the functions above.
+
+ PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
+ The interface may change in later versions of this library. But
+ the interface is designed following the principals used for the
+ other reentrant functions so the chances are good this is what the
+ POSIX people would choose.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+
+# ifdef __USE_GNU
+extern int getgrent_r (struct group *__restrict __resultbuf,
+ char *__restrict __buffer, size_t __buflen,
+ struct group **__restrict __result);
+# endif
+
+/* Search for an entry with a matching group ID.
+
+ This function is a possible cancellation point and therefore not
+ marked with __THROW. */
+extern int getgrgid_r (__gid_t __gid, struct group *__restrict __resultbuf,
+ char *__restrict __buffer, size_t __buflen,
+ struct group **__restrict __result);
+
+/* Search for an entry with a matching group name.
+
+ This function is a possible cancellation point and therefore not
+ marked with __THROW. */
+extern int getgrnam_r (const char *__restrict __name,
+ struct group *__restrict __resultbuf,
+ char *__restrict __buffer, size_t __buflen,
+ struct group **__restrict __result);
+
+# ifdef __USE_MISC
+/* Read a group entry from STREAM. This function is not standardized
+ an probably never will.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern int fgetgrent_r (FILE *__restrict __stream,
+ struct group *__restrict __resultbuf,
+ char *__restrict __buffer, size_t __buflen,
+ struct group **__restrict __result);
+# endif
+
+#endif /* POSIX or reentrant */
+
+
+#ifdef __USE_MISC
+
+# define __need_size_t
+# include <stddef.h>
+
+/* Set the group set for the current user to GROUPS (N of them). */
+extern int setgroups (size_t __n, const __gid_t *__groups) __THROW;
+
+/* Store at most *NGROUPS members of the group set for USER into
+ *GROUPS. Also include GROUP. The actual number of groups found is
+ returned in *NGROUPS. Return -1 if the if *NGROUPS is too small.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern int getgrouplist (const char *__user, __gid_t __group,
+ __gid_t *__groups, int *__ngroups);
+
+/* 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.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern int initgroups (const char *__user, __gid_t __group);
+
+#endif /* Use misc. */
+
+__END_DECLS
+
+#endif /* grp.h */
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