1 /* Copyright (C) 1991, 1992, 1995, 1996 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 #ifdef __USE_REENTRANT
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));
112 /* Search for an entry with a matching group ID. */
113 extern int getgrgid_r __P ((__gid_t __gid, struct group *__resultbuf,
114 char *buffer, size_t __buflen,
115 struct group **__result));
117 /* Search for an entry with a matching group name. */
118 extern int getgrnam_r __P ((__const char *__name, struct group *__resultbuf,
119 char *buffer, size_t __buflen,
120 struct group **__result));
123 /* Read a group entry from STREAM. This function is not standardized
124 an probably never will. */
125 extern int __fgetgrent_r __P ((FILE * __stream, struct group *__resultbuf,
126 char *buffer, size_t __buflen,
127 struct group **__result));
128 extern int fgetgrent_r __P ((FILE * __stream, struct group *__resultbuf,
129 char *buffer, size_t __buflen,
130 struct group **__result));
133 #endif /* reentrant */
138 #define __need_size_t
141 /* Set the group set for the current user to GROUPS (N of them). */
142 extern int setgroups __P ((size_t __n, __const __gid_t *__groups));
144 /* Initialize the group set for the current user
145 by reading the group database and using all groups
146 of which USER is a member. Also include GROUP. */
147 extern int initgroups __P ((__const char *__user, __gid_t __group));
149 #endif /* Use BSD. */