1 /* Copyright (C) 1991, 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
20 * POSIX Standard: 9.2.1 Group Database Access <grp.h>
30 #include <gnu/types.h>
39 /* The group structure. */
42 char *gr_name
; /* Group name. */
43 char *gr_passwd
; /* Password. */
44 __gid_t gr_gid
; /* Group ID. */
45 char **gr_mem
; /* Member list. */
49 #if defined(__USE_SVID) || defined(__USE_GNU)
55 /* Return a new stream open on the group file. */
56 extern FILE *__grpopen
__P ((void));
58 /* Read a group entry from STREAM, filling in G.
59 Return the `struct group' of G if successful, NULL on failure. */
60 extern struct group
*__grpread
__P ((FILE *__stream
, __ptr_t __g
));
62 /* Return a chunk of memory containing pre-initialized data for __grpread. */
63 extern __ptr_t __grpalloc
__P ((void));
65 /* Scan the group file, filling in G, until SELECTOR returns nonzero for an
66 entry. Return the `struct group' of G if successful, NULL on failure. */
67 extern struct group
*__grpscan
__P ((__ptr_t
*__p
,
68 int (*__selector
) (struct group
*)));
72 #if defined(__USE_SVID) || defined (__USE_BSD) || defined(__USE_XOPEN_EXTENDED)
73 /* Rewind the group-file stream. */
74 extern void setgrent
__P ((void));
76 /* Close the group-file stream. */
77 extern void endgrent
__P ((void));
79 /* Read an entry from the group-file stream, opening it if necessary. */
80 extern struct group
*getgrent
__P ((void));
84 /* Read a group entry from STREAM. */
85 extern struct group
*fgetgrent
__P ((FILE *__stream
));
88 /* Search for an entry with a matching group ID. */
89 extern struct group
*getgrgid
__P ((__gid_t __gid
));
91 /* Search for an entry with a matching group name. */
92 extern struct group
*getgrnam
__P ((__const
char *__name
));
94 #if defined __USE_POSIX || defined __USE_REENTRENT
95 /* Reasonable value for the buffer sized used in the reentrant
96 functions below. But better use `sysconf'. */
97 #define NSS_BUFLEN_GROUP 1024
99 /* Reentrant versions of some of the functions above.
101 PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
102 The interface may change in later versions of this library. But
103 the interface is designed following the principals used for the
104 other reentrant functions so the chances are good this is what the
105 POSIX people would choose. */
107 #if defined(__USE_SVID) || defined (__USE_BSD) || defined(__USE_XOPEN_EXTENDED)
108 extern int __getgrent_r
__P ((struct group
*__resultbuf
, char *buffer
,
109 size_t __buflen
, struct group
**__result
));
110 extern int getgrent_r
__P ((struct group
*__resultbuf
, char *buffer
,
111 size_t __buflen
, struct group
**__result
));
114 /* Search for an entry with a matching group ID. */
115 extern int getgrgid_r
__P ((__gid_t __gid
, struct group
*__resultbuf
,
116 char *buffer
, size_t __buflen
,
117 struct group
**__result
));
119 /* Search for an entry with a matching group name. */
120 extern int getgrnam_r
__P ((__const
char *__name
, struct group
*__resultbuf
,
121 char *buffer
, size_t __buflen
,
122 struct group
**__result
));
125 /* Read a group entry from STREAM. This function is not standardized
126 an probably never will. */
127 extern int __fgetgrent_r
__P ((FILE * __stream
, struct group
*__resultbuf
,
128 char *buffer
, size_t __buflen
,
129 struct group
**__result
));
130 extern int fgetgrent_r
__P ((FILE * __stream
, struct group
*__resultbuf
,
131 char *buffer
, size_t __buflen
,
132 struct group
**__result
));
135 #endif /* POSIX or reentrant */
140 #define __need_size_t
143 /* Set the group set for the current user to GROUPS (N of them). */
144 extern int setgroups
__P ((size_t __n
, __const __gid_t
*__groups
));
146 /* Initialize the group set for the current user
147 by reading the group database and using all groups
148 of which USER is a member. Also include GROUP. */
149 extern int initgroups
__P ((__const
char *__user
, __gid_t __group
));
151 #endif /* Use BSD. */