1/* Copyright (C) 1991,1992,1995-2001,2003,2004 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 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 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19/* 20 * POSIX Standard: 9.2.1 Group Database Access <grp.h> 21 */ 22 23#ifndef _GRP_H 24#define _GRP_H 1 25 26#include <features.h> 27 28__BEGIN_DECLS 29 30#include <bits/types.h> 31 32#define __need_size_t 33#include <stddef.h> 34 35 36/* For the Single Unix specification we must define this type here. */ 37#if (defined __USE_XOPEN || defined __USE_XOPEN2K) && !defined __gid_t_defined 38typedef __gid_t gid_t; 39# define __gid_t_defined 40#endif 41 42/* The group structure. */ 43struct group 44 { 45 char *gr_name; /* Group name. */ 46 char *gr_passwd; /* Password. */ 47 __gid_t gr_gid; /* Group ID. */ 48 char **gr_mem; /* Member list. */ 49 }; 50 51 52#if defined __USE_SVID || defined __USE_GNU 53# define __need_FILE 54# include <stdio.h> 55#endif 56 57 58#if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED 59/* Rewind the group-file stream. 60 61 This function is a possible cancellation point and therefore not 62 marked with __THROW. */ 63extern void setgrent (void); 64 65/* Close the group-file stream. 66 67 This function is a possible cancellation point and therefore not 68 marked with __THROW. */ 69extern void endgrent (void); 70 71/* Read an entry from the group-file stream, opening it if necessary. 72 73 This function is a possible cancellation point and therefore not 74 marked with __THROW. */ 75extern struct group *getgrent (void); 76#endif 77 78#ifdef __USE_SVID 79/* Read a group entry from STREAM. 80 81 This function is not part of POSIX and therefore no official 82 cancellation point. But due to similarity with an POSIX interface 83 or due to the implementation it is a cancellation point and 84 therefore not marked with __THROW. */ 85extern struct group *fgetgrent (FILE *__stream); 86#endif 87 88#ifdef __USE_GNU 89/* Write the given entry onto the given stream. 90 91 This function is not part of POSIX and therefore no official 92 cancellation point. But due to similarity with an POSIX interface 93 or due to the implementation it is a cancellation point and 94 therefore not marked with __THROW. */ 95extern int putgrent (__const struct group *__restrict __p, 96 FILE *__restrict __f); 97#endif 98 99/* Search for an entry with a matching group ID. 100 101 This function is a possible cancellation point and therefore not 102 marked with __THROW. */ 103extern struct group *getgrgid (__gid_t __gid); 104 105/* Search for an entry with a matching group name. 106 107 This function is a possible cancellation point and therefore not 108 marked with __THROW. */ 109extern struct group *getgrnam (__const char *__name); 110 111#if defined __USE_POSIX || defined __USE_MISC 112 113# ifdef __USE_MISC 114/* Reasonable value for the buffer sized used in the reentrant 115 functions below. But better use `sysconf'. */ 116# define NSS_BUFLEN_GROUP 1024 117# endif 118 119/* Reentrant versions of some of the functions above. 120 121 PLEASE NOTE: the `getgrent_r' function is not (yet) standardized. 122 The interface may change in later versions of this library. But 123 the interface is designed following the principals used for the 124 other reentrant functions so the chances are good this is what the 125 POSIX people would choose. 126 127 This function is not part of POSIX and therefore no official 128 cancellation point. But due to similarity with an POSIX interface 129 or due to the implementation it is a cancellation point and 130 therefore not marked with __THROW. */ 131 132# ifdef __USE_GNU 133extern int getgrent_r (struct group *__restrict __resultbuf, 134 char *__restrict __buffer, size_t __buflen, 135 struct group **__restrict __result); 136# endif 137 138/* Search for an entry with a matching group ID. 139 140 This function is a possible cancellation point and therefore not 141 marked with __THROW. */ 142extern int getgrgid_r (__gid_t __gid, struct group *__restrict __resultbuf, 143 char *__restrict __buffer, size_t __buflen, 144 struct group **__restrict __result); 145 146/* Search for an entry with a matching group name. 147 148 This function is a possible cancellation point and therefore not 149 marked with __THROW. */ 150extern int getgrnam_r (__const char *__restrict __name, 151 struct group *__restrict __resultbuf, 152 char *__restrict __buffer, size_t __buflen, 153 struct group **__restrict __result); 154 155# ifdef __USE_SVID 156/* Read a group entry from STREAM. This function is not standardized 157 an probably never will. 158 159 This function is not part of POSIX and therefore no official 160 cancellation point. But due to similarity with an POSIX interface 161 or due to the implementation it is a cancellation point and 162 therefore not marked with __THROW. */ 163extern int fgetgrent_r (FILE *__restrict __stream, 164 struct group *__restrict __resultbuf, 165 char *__restrict __buffer, size_t __buflen, 166 struct group **__restrict __result); 167# endif 168 169#endif /* POSIX or reentrant */ 170 171 172#if defined __USE_BSD || defined __USE_GNU 173 174# define __need_size_t 175# include <stddef.h> 176 177/* Store at most *NGROUPS members of the group set for USER into 178 *GROUPS. Also include GROUP. The actual number of groups found is 179 returned in *NGROUPS. Return -1 if the if *NGROUPS is too small. 180 In all cases the actual number of groups is stored in *NGROUPS. 181 182 This function is not part of POSIX and therefore no official 183 cancellation point. But due to similarity with an POSIX interface 184 or due to the implementation it is a cancellation point and 185 therefore not marked with __THROW. */ 186extern int getgrouplist (__const char *__user, __gid_t __group, 187 __gid_t *__groups, int *__ngroups); 188 189#endif 190 191#if defined __USE_BSD 192 193/* Set the group set for the current user to GROUPS (N of them). */ 194extern int setgroups (size_t __n, __const __gid_t *__groups) __THROW; 195 196/* Initialize the group set for the current user 197 by reading the group database and using all groups 198 of which USER is a member. Also include GROUP. 199 200 This function is not part of POSIX and therefore no official 201 cancellation point. But due to similarity with an POSIX interface 202 or due to the implementation it is a cancellation point and 203 therefore not marked with __THROW. */ 204extern int initgroups (__const char *__user, __gid_t __group); 205 206#endif /* Use BSD. */ 207 208__END_DECLS 209 210#endif /* grp.h */ 211