grp/grp.h

   1 /* Copyright (C) 1991,1992,1995-2001,2003,2004,2010
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /*
  21  *      POSIX Standard: 9.2.1 Group Database Access     <grp.h>
  22  */
  23
  24 #ifndef _GRP_H
  25 #define _GRP_H  1
  26
  27 #include <features.h>
  28
  29 __BEGIN_DECLS
  30
  31 #include <bits/types.h>
  32
  33 #define __need_size_t
  34 #include <stddef.h>
  35
  36
  37 /* For the Single Unix specification we must define this type here.  */
  38 #if (defined __USE_XOPEN || defined __USE_XOPEN2K) && !defined __gid_t_defined
  39 typedef __gid_t gid_t;
  40 # define __gid_t_defined
  41 #endif
  42
  43 /* The group structure.  */
  44 struct group
  45   {
  46     char *gr_name;              /* Group name.  */
  47     char *gr_passwd;            /* Password.    */
  48     __gid_t gr_gid;             /* Group ID.    */
  49     char **gr_mem;              /* Member list. */
  50   };
  51
  52
  53 #if defined __USE_SVID || defined __USE_GNU
  54 # define __need_FILE
  55 # include <stdio.h>
  56 #endif
  57
  58
  59 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  60 /* Rewind the group-file stream.
  61
  62    This function is a possible cancellation point and therefore not
  63    marked with __THROW.  */
  64 extern void setgrent (void);
  65 #endif
  66
  67 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED \
  68     || defined __USE_XOPEN2K8
  69 /* Close the group-file stream.
  70
  71    This function is a possible cancellation point and therefore not
  72    marked with __THROW.  */
  73 extern void endgrent (void);
  74
  75 /* Read an entry from the group-file stream, opening it if necessary.
  76
  77    This function is a possible cancellation point and therefore not
  78    marked with __THROW.  */
  79 extern struct group *getgrent (void);
  80 #endif
  81
  82 #ifdef  __USE_SVID
  83 /* Read a group entry from STREAM.
  84
  85    This function is not part of POSIX and therefore no official
  86    cancellation point.  But due to similarity with an POSIX interface
  87    or due to the implementation it is a cancellation point and
  88    therefore not marked with __THROW.  */
  89 extern struct group *fgetgrent (FILE *__stream);
  90 #endif
  91
  92 #ifdef __USE_GNU
  93 /* Write the given entry onto the given stream.
  94
  95    This function is not part of POSIX and therefore no official
  96    cancellation point.  But due to similarity with an POSIX interface
  97    or due to the implementation it is a cancellation point and
  98    therefore not marked with __THROW.  */
  99 extern int putgrent (__const struct group *__restrict __p,
 100                      FILE *__restrict __f);
 101 #endif
 102
 103 /* Search for an entry with a matching group ID.
 104
 105    This function is a possible cancellation point and therefore not
 106    marked with __THROW.  */
 107 extern struct group *getgrgid (__gid_t __gid);
 108
 109 /* Search for an entry with a matching group name.
 110
 111    This function is a possible cancellation point and therefore not
 112    marked with __THROW.  */
 113 extern struct group *getgrnam (__const char *__name);
 114
 115 #if defined __USE_POSIX || defined __USE_MISC
 116
 117 # ifdef __USE_MISC
 118 /* Reasonable value for the buffer sized used in the reentrant
 119    functions below.  But better use `sysconf'.  */
 120 #  define NSS_BUFLEN_GROUP      1024
 121 # endif
 122
 123 /* Reentrant versions of some of the functions above.
 124
 125    PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
 126    The interface may change in later versions of this library.  But
 127    the interface is designed following the principals used for the
 128    other reentrant functions so the chances are good this is what the
 129    POSIX people would choose.
 130
 131    This function is not part of POSIX and therefore no official
 132    cancellation point.  But due to similarity with an POSIX interface
 133    or due to the implementation it is a cancellation point and
 134    therefore not marked with __THROW.  */
 135
 136 # ifdef __USE_GNU
 137 extern int getgrent_r (struct group *__restrict __resultbuf,
 138                        char *__restrict __buffer, size_t __buflen,
 139                        struct group **__restrict __result);
 140 # endif
 141
 142 /* Search for an entry with a matching group ID.
 143
 144    This function is a possible cancellation point and therefore not
 145    marked with __THROW.  */
 146 extern int getgrgid_r (__gid_t __gid, struct group *__restrict __resultbuf,
 147                        char *__restrict __buffer, size_t __buflen,
 148                        struct group **__restrict __result);
 149
 150 /* Search for an entry with a matching group name.
 151
 152    This function is a possible cancellation point and therefore not
 153    marked with __THROW.  */
 154 extern int getgrnam_r (__const char *__restrict __name,
 155                        struct group *__restrict __resultbuf,
 156                        char *__restrict __buffer, size_t __buflen,
 157                        struct group **__restrict __result);
 158
 159 # ifdef __USE_SVID
 160 /* Read a group entry from STREAM.  This function is not standardized
 161    an probably never will.
 162
 163    This function is not part of POSIX and therefore no official
 164    cancellation point.  But due to similarity with an POSIX interface
 165    or due to the implementation it is a cancellation point and
 166    therefore not marked with __THROW.  */
 167 extern int fgetgrent_r (FILE *__restrict __stream,
 168                         struct group *__restrict __resultbuf,
 169                         char *__restrict __buffer, size_t __buflen,
 170                         struct group **__restrict __result);
 171 # endif
 172
 173 #endif  /* POSIX or reentrant */
 174
 175
 176 #ifdef  __USE_BSD
 177
 178 # define __need_size_t
 179 # include <stddef.h>
 180
 181 /* Set the group set for the current user to GROUPS (N of them).  */
 182 extern int setgroups (size_t __n, __const __gid_t *__groups) __THROW;
 183
 184 /* Store at most *NGROUPS members of the group set for USER into
 185    *GROUPS.  Also include GROUP.  The actual number of groups found is
 186    returned in *NGROUPS.  Return -1 if the if *NGROUPS is too small.
 187
 188    This function is not part of POSIX and therefore no official
 189    cancellation point.  But due to similarity with an POSIX interface
 190    or due to the implementation it is a cancellation point and
 191    therefore not marked with __THROW.  */
 192 extern int getgrouplist (__const char *__user, __gid_t __group,
 193                          __gid_t *__groups, int *__ngroups);
 194
 195 /* Initialize the group set for the current user
 196    by reading the group database and using all groups
 197    of which USER is a member.  Also include GROUP.
 198
 199    This function is not part of POSIX and therefore no official
 200    cancellation point.  But due to similarity with an POSIX interface
 201    or due to the implementation it is a cancellation point and
 202    therefore not marked with __THROW.  */
 203 extern int initgroups (__const char *__user, __gid_t __group);
 204
 205 #endif /* Use BSD.  */
 206
 207 __END_DECLS
 208
 209 #endif /* grp.h  */