grp/grp.h

   1 /* Copyright (C) 1991-2013 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      POSIX Standard: 9.2.1 Group Database Access     <grp.h>
  20  */
  21
  22 #ifndef _GRP_H
  23 #define _GRP_H  1
  24
  25 #include <features.h>
  26
  27 __BEGIN_DECLS
  28
  29 #include <bits/types.h>
  30
  31 #define __need_size_t
  32 #include <stddef.h>
  33
  34
  35 /* For the Single Unix specification we must define this type here.  */
  36 #if (defined __USE_XOPEN || defined __USE_XOPEN2K) && !defined __gid_t_defined
  37 typedef __gid_t gid_t;
  38 # define __gid_t_defined
  39 #endif
  40
  41 /* The group structure.  */
  42 struct group
  43   {
  44     char *gr_name;              /* Group name.  */
  45     char *gr_passwd;            /* Password.    */
  46     __gid_t gr_gid;             /* Group ID.    */
  47     char **gr_mem;              /* Member list. */
  48   };
  49
  50
  51 #if defined __USE_SVID || defined __USE_GNU
  52 # define __need_FILE
  53 # include <stdio.h>
  54 #endif
  55
  56
  57 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  58 /* Rewind the group-file stream.
  59
  60    This function is a possible cancellation point and therefore not
  61    marked with __THROW.  */
  62 extern void setgrent (void);
  63 #endif
  64
  65 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED \
  66     || defined __USE_XOPEN2K8
  67 /* Close the group-file stream.
  68
  69    This function is a possible cancellation point and therefore not
  70    marked with __THROW.  */
  71 extern void endgrent (void);
  72
  73 /* Read an entry from the group-file stream, opening it if necessary.
  74
  75    This function is a possible cancellation point and therefore not
  76    marked with __THROW.  */
  77 extern struct group *getgrent (void);
  78 #endif
  79
  80 #ifdef  __USE_SVID
  81 /* Read a group entry from STREAM.
  82
  83    This function is not part of POSIX and therefore no official
  84    cancellation point.  But due to similarity with an POSIX interface
  85    or due to the implementation it is a cancellation point and
  86    therefore not marked with __THROW.  */
  87 extern struct group *fgetgrent (FILE *__stream);
  88 #endif
  89
  90 #ifdef __USE_GNU
  91 /* Write the given entry onto the given stream.
  92
  93    This function is not part of POSIX and therefore no official
  94    cancellation point.  But due to similarity with an POSIX interface
  95    or due to the implementation it is a cancellation point and
  96    therefore not marked with __THROW.  */
  97 extern int putgrent (const struct group *__restrict __p,
  98                      FILE *__restrict __f);
  99 #endif
 100
 101 /* Search for an entry with a matching group ID.
 102
 103    This function is a possible cancellation point and therefore not
 104    marked with __THROW.  */
 105 extern struct group *getgrgid (__gid_t __gid);
 106
 107 /* Search for an entry with a matching group name.
 108
 109    This function is a possible cancellation point and therefore not
 110    marked with __THROW.  */
 111 extern struct group *getgrnam (const char *__name);
 112
 113 #if defined __USE_POSIX || defined __USE_MISC
 114
 115 # ifdef __USE_MISC
 116 /* Reasonable value for the buffer sized used in the reentrant
 117    functions below.  But better use `sysconf'.  */
 118 #  define NSS_BUFLEN_GROUP      1024
 119 # endif
 120
 121 /* Reentrant versions of some of the functions above.
 122
 123    PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
 124    The interface may change in later versions of this library.  But
 125    the interface is designed following the principals used for the
 126    other reentrant functions so the chances are good this is what the
 127    POSIX people would choose.
 128
 129    This function is not part of POSIX and therefore no official
 130    cancellation point.  But due to similarity with an POSIX interface
 131    or due to the implementation it is a cancellation point and
 132    therefore not marked with __THROW.  */
 133
 134 # ifdef __USE_GNU
 135 extern int getgrent_r (struct group *__restrict __resultbuf,
 136                        char *__restrict __buffer, size_t __buflen,
 137                        struct group **__restrict __result);
 138 # endif
 139
 140 /* Search for an entry with a matching group ID.
 141
 142    This function is a possible cancellation point and therefore not
 143    marked with __THROW.  */
 144 extern int getgrgid_r (__gid_t __gid, struct group *__restrict __resultbuf,
 145                        char *__restrict __buffer, size_t __buflen,
 146                        struct group **__restrict __result);
 147
 148 /* Search for an entry with a matching group name.
 149
 150    This function is a possible cancellation point and therefore not
 151    marked with __THROW.  */
 152 extern int getgrnam_r (const char *__restrict __name,
 153                        struct group *__restrict __resultbuf,
 154                        char *__restrict __buffer, size_t __buflen,
 155                        struct group **__restrict __result);
 156
 157 # ifdef __USE_SVID
 158 /* Read a group entry from STREAM.  This function is not standardized
 159    an probably never will.
 160
 161    This function is not part of POSIX and therefore no official
 162    cancellation point.  But due to similarity with an POSIX interface
 163    or due to the implementation it is a cancellation point and
 164    therefore not marked with __THROW.  */
 165 extern int fgetgrent_r (FILE *__restrict __stream,
 166                         struct group *__restrict __resultbuf,
 167                         char *__restrict __buffer, size_t __buflen,
 168                         struct group **__restrict __result);
 169 # endif
 170
 171 #endif  /* POSIX or reentrant */
 172
 173
 174 #ifdef  __USE_BSD
 175
 176 # define __need_size_t
 177 # include <stddef.h>
 178
 179 /* Set the group set for the current user to GROUPS (N of them).  */
 180 extern int setgroups (size_t __n, const __gid_t *__groups) __THROW;
 181
 182 /* Store at most *NGROUPS members of the group set for USER into
 183    *GROUPS.  Also include GROUP.  The actual number of groups found is
 184    returned in *NGROUPS.  Return -1 if the if *NGROUPS is too small.
 185
 186    This function is not part of POSIX and therefore no official
 187    cancellation point.  But due to similarity with an POSIX interface
 188    or due to the implementation it is a cancellation point and
 189    therefore not marked with __THROW.  */
 190 extern int getgrouplist (const char *__user, __gid_t __group,
 191                          __gid_t *__groups, int *__ngroups);
 192
 193 /* Initialize the group set for the current user
 194    by reading the group database and using all groups
 195    of which USER is a member.  Also include GROUP.
 196
 197    This function is not part of POSIX and therefore no official
 198    cancellation point.  But due to similarity with an POSIX interface
 199    or due to the implementation it is a cancellation point and
 200    therefore not marked with __THROW.  */
 201 extern int initgroups (const char *__user, __gid_t __group);
 202
 203 #endif /* Use BSD.  */
 204
 205 __END_DECLS
 206
 207 #endif /* grp.h  */