grp/grp.h

   1 /* Copyright (C) 1991,1992,1995-2001,2003,2004,2010,2012
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  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
  38 typedef __gid_t gid_t;
  39 # define __gid_t_defined
  40 #endif
  41
  42 /* The group structure.  */
  43 struct 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.  */
  63 extern void setgrent (void);
  64 #endif
  65
  66 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED \
  67     || defined __USE_XOPEN2K8
  68 /* Close the group-file stream.
  69
  70    This function is a possible cancellation point and therefore not
  71    marked with __THROW.  */
  72 extern void endgrent (void);
  73
  74 /* Read an entry from the group-file stream, opening it if necessary.
  75
  76    This function is a possible cancellation point and therefore not
  77    marked with __THROW.  */
  78 extern struct group *getgrent (void);
  79 #endif
  80
  81 #ifdef  __USE_SVID
  82 /* Read a group entry from STREAM.
  83
  84    This function is not part of POSIX and therefore no official
  85    cancellation point.  But due to similarity with an POSIX interface
  86    or due to the implementation it is a cancellation point and
  87    therefore not marked with __THROW.  */
  88 extern struct group *fgetgrent (FILE *__stream);
  89 #endif
  90
  91 #ifdef __USE_GNU
  92 /* Write the given entry onto the given stream.
  93
  94    This function is not part of POSIX and therefore no official
  95    cancellation point.  But due to similarity with an POSIX interface
  96    or due to the implementation it is a cancellation point and
  97    therefore not marked with __THROW.  */
  98 extern int putgrent (const struct group *__restrict __p,
  99                      FILE *__restrict __f);
 100 #endif
 101
 102 /* Search for an entry with a matching group ID.
 103
 104    This function is a possible cancellation point and therefore not
 105    marked with __THROW.  */
 106 extern struct group *getgrgid (__gid_t __gid);
 107
 108 /* Search for an entry with a matching group name.
 109
 110    This function is a possible cancellation point and therefore not
 111    marked with __THROW.  */
 112 extern struct group *getgrnam (const char *__name);
 113
 114 #if defined __USE_POSIX || defined __USE_MISC
 115
 116 # ifdef __USE_MISC
 117 /* Reasonable value for the buffer sized used in the reentrant
 118    functions below.  But better use `sysconf'.  */
 119 #  define NSS_BUFLEN_GROUP      1024
 120 # endif
 121
 122 /* Reentrant versions of some of the functions above.
 123
 124    PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
 125    The interface may change in later versions of this library.  But
 126    the interface is designed following the principals used for the
 127    other reentrant functions so the chances are good this is what the
 128    POSIX people would choose.
 129
 130    This function is not part of POSIX and therefore no official
 131    cancellation point.  But due to similarity with an POSIX interface
 132    or due to the implementation it is a cancellation point and
 133    therefore not marked with __THROW.  */
 134
 135 # ifdef __USE_GNU
 136 extern int getgrent_r (struct group *__restrict __resultbuf,
 137                        char *__restrict __buffer, size_t __buflen,
 138                        struct group **__restrict __result);
 139 # endif
 140
 141 /* Search for an entry with a matching group ID.
 142
 143    This function is a possible cancellation point and therefore not
 144    marked with __THROW.  */
 145 extern int getgrgid_r (__gid_t __gid, struct group *__restrict __resultbuf,
 146                        char *__restrict __buffer, size_t __buflen,
 147                        struct group **__restrict __result);
 148
 149 /* Search for an entry with a matching group name.
 150
 151    This function is a possible cancellation point and therefore not
 152    marked with __THROW.  */
 153 extern int getgrnam_r (const char *__restrict __name,
 154                        struct group *__restrict __resultbuf,
 155                        char *__restrict __buffer, size_t __buflen,
 156                        struct group **__restrict __result);
 157
 158 # ifdef __USE_SVID
 159 /* Read a group entry from STREAM.  This function is not standardized
 160    an probably never will.
 161
 162    This function is not part of POSIX and therefore no official
 163    cancellation point.  But due to similarity with an POSIX interface
 164    or due to the implementation it is a cancellation point and
 165    therefore not marked with __THROW.  */
 166 extern int fgetgrent_r (FILE *__restrict __stream,
 167                         struct group *__restrict __resultbuf,
 168                         char *__restrict __buffer, size_t __buflen,
 169                         struct group **__restrict __result);
 170 # endif
 171
 172 #endif  /* POSIX or reentrant */
 173
 174
 175 #ifdef  __USE_BSD
 176
 177 # define __need_size_t
 178 # include <stddef.h>
 179
 180 /* Set the group set for the current user to GROUPS (N of them).  */
 181 extern int setgroups (size_t __n, const __gid_t *__groups) __THROW;
 182
 183 /* Store at most *NGROUPS members of the group set for USER into
 184    *GROUPS.  Also include GROUP.  The actual number of groups found is
 185    returned in *NGROUPS.  Return -1 if the if *NGROUPS is too small.
 186
 187    This function is not part of POSIX and therefore no official
 188    cancellation point.  But due to similarity with an POSIX interface
 189    or due to the implementation it is a cancellation point and
 190    therefore not marked with __THROW.  */
 191 extern int getgrouplist (const char *__user, __gid_t __group,
 192                          __gid_t *__groups, int *__ngroups);
 193
 194 /* Initialize the group set for the current user
 195    by reading the group database and using all groups
 196    of which USER is a member.  Also include GROUP.
 197
 198    This function is not part of POSIX and therefore no official
 199    cancellation point.  But due to similarity with an POSIX interface
 200    or due to the implementation it is a cancellation point and
 201    therefore not marked with __THROW.  */
 202 extern int initgroups (const char *__user, __gid_t __group);
 203
 204 #endif /* Use BSD.  */
 205
 206 __END_DECLS
 207
 208 #endif /* grp.h  */